Java Mongodb numberlong查询（java查询mongodb数据）

25-02-16 19

如果您想了解JavaMongodbnumberlong查询的相关知识，那么本文是一篇不可错过的文章，我们将对java查询mongodb数据进行全面详尽的解释，并且为您提供关于C#、Java驱动连接Mo

如果您想了解Java Mongodb numberlong查询的相关知识，那么本文是一篇不可错过的文章，我们将对java查询mongodb数据进行全面详尽的解释，并且为您提供关于C#、Java驱动连接MongoDB以及封装(C#的MongoDBHelper,Java的MongoDBUtil)、Java MongoDB：com.mongodb.DB和com.mongodb.client有什么区别、java – 如何使用mongodb和NumberLong计算平均值、Java 连接 MongoDB 报错 “java.lang.IllegalArgumentException: clusterListener can not be null” 的解决办法的有价值的信息。

本文目录一览：

Java Mongodb numberlong查询（java查询mongodb数据）
C#、Java驱动连接MongoDB以及封装(C#的MongoDBHelper,Java的MongoDBUtil)
Java MongoDB：com.mongodb.DB和com.mongodb.client有什么区别
java – 如何使用mongodb和NumberLong计算平均值
Java 连接 MongoDB 报错 “java.lang.IllegalArgumentException: clusterListener can not be null” 的解决办法

Java Mongodb numberlong查询（java查询mongodb数据）

我正在尝试从mongoDB获取特定数据。我有5个字段，用户可以根据这些字段进行搜索。这是我的代码：

Map<Object, Object> fields = new HashMap<Object, Object>();if (textField.getText().length() != 0)    fields.put("FirstName", textField.getText());if (textField_1.getText().length() != 0)    fields.put("LastName", textField_1.getText());if (textField_2.getText().length() != 0)    fields.put("City", textField_2.getText());if (textField_3.getText().length() != 0)    fields.put("EmailAddress", textField_3.getText());if (textField_4.getText().length() != 0)    fields.put("PhoneNumber", "NumberLong(" + textField_4.getText() + ")");query.putAll(fields);long startTime = System.nanoTime();DBCursor result = coll.find(query);ArrayList<ArrayList<Object>> list = createListDataMongo(result);

除电话号码外，所有搜索字段均有效。当我添加到查询电话号码后，什么也没有返回。PhoneNumber是NumberLong我的mongoDB数据库中的一个字段。我该如何解决这个问题？

答案1

小编典典

fields.put("PhoneNumber", "NumberLong(" + textField_4.getText() + ")");

搜索PhoneNumber值"NumberLong(" + textField_4.getText() +")"类型为text（String）的文档。

请尝试这个。

fields.put("PhoneNumber", Long.parseLong(textField_4.getText()));

和往常一样，处理异常。

C#、Java驱动连接MongoDB以及封装(C#的MongoDBHelper,Java的MongoDBUtil)

一.C#驱动连接MongoDB

1.创建项目

执行命令：dotnet new console -n MongoDbDriverDemo

2.添加依赖包

执行命令：dotnet add package MongoDB.Driver --version 2.10.2

3.测试

using System;
using System.Linq;
using MongoDB.Bson;
using MongoDB.Driver;

namespace MongoDBDriverDemo
{
    class Program
    {

        async static System.Threading.Tasks.Task Main(string[] args)
        {
            try
            {
                MongoClient client = new MongoClient("mongodb://localhost:27017");

                var database = client.GetDatabase("foo");

                var collection = database.GetCollection<BsonDocument>("bar");

                Console.WriteLine("-----------------添加文档--------------------");
                {
                    var document = new BsonDocument
                               {
                                   { "name", "MongoDB" },
                                   { "type", "Database" },
                                   { "count", 1 },
                                   { "info", new BsonDocument
                                       {
                                           { "x", 203 },
                                           { "y", 102 }
                                       }}
                               };

                    await collection.InsertOneAsync(document);//异步
                    //collection.InsertOne(document);

                    var documents = Enumerable.Range(0, 100).Select(i => new BsonDocument("i", i));
                    //collection.InsertMany(documents);
                    await collection.InsertManyAsync(documents);
                }
                Console.WriteLine("------------------统计文档--------------------");
                {
                                 
                    var count = collection.CountDocuments(new BsonDocument());
                    var asyncCount = await collection.CountDocumentsAsync(new BsonDocument());
                    Console.WriteLine(count);
                    Console.WriteLine(asyncCount);
                }
                Console.WriteLine("-----------------查询文档--------------------");
                {
                    Console.WriteLine("------------------查询一个--------------------");
                    { 
                        var document = collection.Find(new BsonDocument()).FirstOrDefault();
                        Console.WriteLine(document.ToString());

                        var asyncDocument = await collection.Find(new BsonDocument()).FirstOrDefaultAsync();
                        Console.WriteLine(asyncDocument.ToString());
                    }
                    Console.WriteLine("------------------查询多个--------------------");
                    {
                        var documentList = collection.Find(new BsonDocument()).ToList();
                        documentList.ForEach(d => Console.WriteLine(d.ToString()));

                        var asyncDocumentList =await collection.Find(new BsonDocument()).ToListAsync();
                        await collection.Find(new BsonDocument()).ForEachAsync(d => Console.WriteLine(d));
                    }
                    {
                        var cursor = collection.Find(new BsonDocument()).ToCursor();
                        foreach (var document in cursor.ToEnumerable())
                        {
                            Console.WriteLine(document);
                        }
                    }
                }
                {
                    {
                        var filter = Builders<BsonDocument>.Filter.Eq("i", 71);
                        {
                            var document = collection.Find(filter).First();
                            Console.WriteLine(document);
                        }
                        {
                            var document = await collection.Find(filter).FirstAsync();
                            Console.WriteLine(document);
                        }
                    }
                    Console.WriteLine("------------------过滤文档--------------------");
                    {
                        var filter = Builders<BsonDocument>.Filter.Gt("i", 50);
                        {
                            var cursor = collection.Find(filter).ToCursor();
                            foreach (var document in cursor.ToEnumerable())
                            {
                                Console.WriteLine(document);
                            }
                        }
                        {
                            await collection.Find(filter).ForEachAsync(document => Console.WriteLine(document));
                        }
                    }
                    {
                        var filterBuilder = Builders<BsonDocument>.Filter;
                        var filter = filterBuilder.Gt("i", 50) & filterBuilder.Lte("i", 100);
                        {
                            var cursor = collection.Find(filter).ToCursor();
                            foreach (var document in cursor.ToEnumerable())
                            {
                                Console.WriteLine(document);
                            }
                        }
                        {
                            await collection.Find(filter).ForEachAsync(document => Console.WriteLine(document));
                        }
                    }
                }
                Console.WriteLine("------------------排序文档--------------------");
                {
                    var filter = Builders<BsonDocument>.Filter.Exists("i");
                    var sort = Builders<BsonDocument>.Sort.Descending("i");
                    {
                        var document = collection.Find(filter).Sort(sort).First();
                    }

                    {
                        var document = await collection.Find(filter).Sort(sort).FirstAsync();
                    }
                }
                Console.WriteLine("------------------过滤文档--------------------");
                {
                    var projection = Builders<BsonDocument>.Projection.Exclude("_id");
                    {
                        var document = collection.Find(new BsonDocument()).Project(projection).First();
                        Console.WriteLine(document.ToString());
                    }
                    {
                        var document = await collection.Find(new BsonDocument()).Project(projection).FirstAsync();
                        Console.WriteLine(document);
                    }
                }
                Console.WriteLine("------------------更新文档--------------------");
                {
                    Console.WriteLine("------------------更新一个--------------------");
                    {
                        var filter = Builders<BsonDocument>.Filter.Eq("i", 10);
                        var update = Builders<BsonDocument>.Update.Set("i", 10);
                        {
                            collection.UpdateOne(filter, update);
                        }
                        {
                            await collection.UpdateOneAsync(filter, update);
                        }
                    }
                    Console.WriteLine("------------------更新多个--------------------");
                    {
                        var filter = Builders<BsonDocument>.Filter.Lt("i", 100);
                        var update = Builders<BsonDocument>.Update.Inc("i", 100);
                        {
                            var result = collection.UpdateMany(filter, update);
                            if (result.IsModifiedCountAvailable) Console.WriteLine(result.ModifiedCount);
                        }
                        {
                            var result = await collection.UpdateManyAsync(filter, update);
                            if (result.IsModifiedCountAvailable) Console.WriteLine(result.ModifiedCount);
                        }
                    }
                }
                Console.WriteLine("------------------刪除文档--------------------");
                {
                    Console.WriteLine("------------------刪除单个--------------------");
                    {
                        var filter = Builders<BsonDocument>.Filter.Eq("i", 110);
                        {
                            collection.DeleteOne(filter);
                        }
                        {
                            await collection.DeleteOneAsync(filter);
                        }
                    }
                    Console.WriteLine("------------------删除多个--------------------");
                    {
                        var filter = Builders<BsonDocument>.Filter.Gte("i", 100);
                        {
                            var result = collection.DeleteMany(filter);
                            Console.WriteLine(result.DeletedCount);
                        }
                        {
                            var result = await collection.DeleteManyAsync(filter);
                            Console.WriteLine(result.DeletedCount);
                        }
                    }
                }
              
                Console.WriteLine("------------------大量写入--------------------");
                {
                    var models = new WriteModel<BsonDocument>[]
                                 {
                                     new InsertOneModel<BsonDocument>(new BsonDocument("_id", 4)),
                                     new InsertOneModel<BsonDocument>(new BsonDocument("_id", 5)),
                                     new InsertOneModel<BsonDocument>(new BsonDocument("_id", 6)),
                                     new UpdateOneModel<BsonDocument>(
                                         new BsonDocument("_id", 1),
                                         new BsonDocument("$set", new BsonDocument("x", 2))),
                                     new DeleteOneModel<BsonDocument>(new BsonDocument("_id", 3)),
                                     new ReplaceOneModel<BsonDocument>(
                                         new BsonDocument("_id", 3),
                                         new BsonDocument("_id", 3).Add("x", 4))
                                 };
                    {
                        {
                            Console.WriteLine("-------------有序批量操作-保证操作顺序-------------------");
                            collection.BulkWrite(models);
                        }
                        /*
                        {
                            Console.WriteLine("-------------无序批量操作-不保证操作顺序-------------------");
                            collection.BulkWrite(models, new BulkWriteOptions { IsOrdered = false });
                        }*/
                    }
                   /* {
                        Console.WriteLine("-------------有序批量操作-保证操作顺序-------------------");
                        await collection.BulkWriteAsync(models);

                        Console.WriteLine("-------------无序批量操作-不保证操作顺序-------------------");
                        await collection.BulkWriteAsync(models, new BulkWriteOptions { IsOrdered = false });
                    }*/
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
                         
            Console.ReadKey();            
        }
    }
    
}

4.结果

C#封装MongoDB

using MongoDB.Driver;
using MongoDB.Bson;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Collections;
using System.Linq.Expressions;

namespace MongoDBDriverDemo
{
    public class MongoDBHelper
    {
        private readonly string mongoDBConnString = null;
        private readonly string databaseName = null;
        private IMongoDatabase database = null;
        private readonly bool autoCreateDb = false;
        private readonly bool autoCreateCollection = false;

        static MongoDBHelper()
        {
            BsonDefaults.GuidRepresentation = GuidRepresentation.Standard;
        }

        public MongoDBHelper(string mongoDBConnString, string databaseName, bool autoCreateDb = false, bool autoCreateCollection = false)
        {
            this.mongoDBConnString = mongoDBConnString;
            this.databaseName = databaseName;
            this.autoCreateDb = autoCreateDb;
            this.autoCreateCollection = autoCreateCollection;
        }

        private MongoClient CreateMongoClient()
        {
            return new MongoClient(mongoDBConnString);
        }

        private IMongoDatabase GetMongoDatabase()
        {
            if (database == null)
            {
                MongoClient client = this.CreateMongoClient();
                if (!this.DatabaseExists(client, databaseName) && !autoCreateDb)
                {
                    throw new KeyNotFoundException("此MongoDB名称不存在：" + databaseName);
                }
            }
            database = CreateMongoClient().GetDatabase(databaseName);
            return database;
        }

        private bool DatabaseExists(MongoClient client, string databaseName)
        {
            try
            {
                var databaseNames = client.ListDatabases().ToList().Select(db => db.GetValue("name").AsString);
                return databaseNames.Contains(databaseName);
            }
            catch
            {
                return true;
            }
        }

        private bool CollectionExists(IMongoDatabase database, string collectionName)
        {
            var options = new ListCollectionsOptions
            {
                Filter = Builders<BsonDocument>.Filter.Eq("name", collectionName)
            };

            return database.ListCollections(options).ToEnumerable().Any();
        }

        private IMongoCollection<TDoc> GetMongoCollection<TDoc>(string name, MongoCollectionSettings settings = null)
        {
            IMongoDatabase mongoDatabase = GetMongoDatabase();
            if (!this.CollectionExists(mongoDatabase, name) && !autoCreateCollection)
            {
                throw new KeyNotFoundException("此Collection名称不存在:" + name);
            }

            return mongoDatabase.GetCollection<TDoc>(name, settings);
        }

        private List<UpdateDefinition<TDoc>> BuildUpdateDefinition<TDoc>(object doc, string parent)
        {
            var updateList = new List<UpdateDefinition<TDoc>>();
            foreach (var property in typeof(TDoc).GetProperties(System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public))
            {
                var key = parent == null ? property.Name : $"{parent}.{property.Name}";
                if ((property.PropertyType.IsClass || property.PropertyType.IsInterface) && property.PropertyType != typeof(string) && property.GetValue(doc) != null)
                {
                    if (typeof(IList).IsAssignableFrom(property.PropertyType))
                    {
                        int i = 0;
                        var subObj = property.GetValue(doc);
                        foreach (var item in subObj as IList)
                        {
                            if (item.GetType().IsClass || item.GetType().IsInterface)
                            {
                                updateList.AddRange(BuildUpdateDefinition<TDoc>(doc, $"{key}.{i}"));
                            }
                            else
                            {
                                updateList.Add(Builders<TDoc>.Update.Set($"{key}.{i}", item));
                            }
                            i++;
                        }
                    }
                    else
                    {
                        var subObj = property.GetValue(doc);
                        foreach (var sub in property.PropertyType.GetProperties(System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance))
                        {
                            updateList.Add(Builders<TDoc>.Update.Set($"{key}.{sub.Name}", sub.GetValue(subObj)));
                        }
                    }
                }
                else
                {
                    updateList.Add(Builders<TDoc>.Update.Set(key, property.GetValue(doc)));
                }

            }
            return updateList;
        }


        private void CreateIndex<TDoc>(IMongoCollection<TDoc> collection, string[] indexFields, CreateOneIndexOptions options = null)
        {
            if (indexFields == null) return;
            var indexKeys = Builders<TDoc>.IndexKeys;
            IndexKeysDefinition<TDoc> keys = null;
            if (indexFields.Length > 0)
                keys = indexKeys.Descending(indexFields[0]);
            for (int i = 1; i < indexFields.Length; i++)
            {
                var strIndex = indexFields[i];
                keys = keys.Descending(strIndex);
            }
            if (keys != null)
                collection.Indexes.CreateOne(new CreateIndexModel<TDoc>(keys), options);
        }


        public void CreateCollectionIndex<TDoc>(string collectionName, string[] indexFields, CreateOneIndexOptions options = null)
            => this.CreateIndex(GetMongoCollection<TDoc>(collectionName), indexFields, options);


        public void CreateCollection<TDoc>(string[] indexFields = null, CreateOneIndexOptions options = null)
            => this.CreateCollection<TDoc>(typeof(TDoc).Name, indexFields, options);

        public void CreateCollection<TDoc>(string collectionName, string[] indexFields = null, CreateOneIndexOptions options = null)
        {
            var mongoDatabase = this.GetMongoDatabase();
            mongoDatabase.CreateCollection(collectionName);
            CreateIndex(this.GetMongoCollection<TDoc>(collectionName), indexFields, options);
        }

        public List<TDoc> Find<TDoc>(Expression<Func<TDoc, bool>> filter, FindOptions options = null)
            => Find<TDoc>(typeof(TDoc).Name, filter, options);

        public List<TDoc> Find<TDoc>(string collectionName, Expression<Func<TDoc, bool>> filter, FindOptions options = null)
            => this.GetMongoCollection<TDoc>(collectionName).Find(filter, options).ToList();

        public List<TDoc> FindByPage<TDoc, TResult>(Expression<Func<TDoc, bool>> filter, Expression<Func<TDoc, TResult>> keySelector, int pageIndex, int pageSize, out int rsCount)
        {
            string collectionName = typeof(TDoc).Name;
            return FindByPage<TDoc, TResult>(collectionName, filter, keySelector, pageIndex, pageSize, out rsCount);
        }

        public List<TDoc> FindByPage<TDoc, TResult>(string collectionName, Expression<Func<TDoc, bool>> filter, Expression<Func<TDoc, TResult>> keySelector, int pageIndex, int pageSize, out int rsCount)
        {
            var colleciton = GetMongoCollection<TDoc>(collectionName);
            rsCount = colleciton.AsQueryable().Where(filter).Count();

            int pageCount = rsCount / pageSize + ((rsCount % pageSize) > 0 ? 1 : 0);
            if (pageIndex > pageCount) pageIndex = pageCount;
            if (pageIndex <= 0) pageIndex = 1;            
            return colleciton.AsQueryable(new AggregateOptions { AllowDiskUse = true }).Where(filter).OrderBy(keySelector).Skip((pageIndex - 1) * pageSize).Take(pageSize).ToList();
        }

        public void Insert<TDoc>(TDoc doc, InsertOneOptions options = null)
        {
            string collectionName = typeof(TDoc).Name;
            Insert<TDoc>(collectionName, doc, options);
        }

        public void Insert<TDoc>(string collectionName, TDoc doc, InsertOneOptions options = null)
        {
            var colleciton = GetMongoCollection<TDoc>(collectionName);
            colleciton.InsertOne(doc, options);
        }


        public void InsertMany<TDoc>(IEnumerable<TDoc> docs, InsertManyOptions options = null)
        {
            string collectionName = typeof(TDoc).Name;
            InsertMany<TDoc>(collectionName, docs, options);
        }

        public void InsertMany<TDoc>(string collectionName, IEnumerable<TDoc> docs, InsertManyOptions options = null)
        {
            var colleciton = GetMongoCollection<TDoc>(collectionName);
            colleciton.InsertMany(docs, options);
        }

        public void Update<TDoc>(TDoc doc, Expression<Func<TDoc, bool>> filter, UpdateOptions options = null)
        {
            string collectionName = typeof(TDoc).Name;
            var colleciton = GetMongoCollection<TDoc>(collectionName);
            List<UpdateDefinition<TDoc>> updateList = BuildUpdateDefinition<TDoc>(doc, null);
            colleciton.UpdateOne(filter, Builders<TDoc>.Update.Combine(updateList), options);
        }

        public void Update<TDoc>(string collectionName, TDoc doc, Expression<Func<TDoc, bool>> filter, UpdateOptions options = null)
        {
            var colleciton = GetMongoCollection<TDoc>(collectionName);
            List<UpdateDefinition<TDoc>> updateList = BuildUpdateDefinition<TDoc>(doc, null);
            colleciton.UpdateOne(filter, Builders<TDoc>.Update.Combine(updateList), options);
        }


        public void Update<TDoc>(TDoc doc, Expression<Func<TDoc, bool>> filter, UpdateDefinition<TDoc> updateFields, UpdateOptions options = null)
        {
            string collectionName = typeof(TDoc).Name;
            Update<TDoc>(collectionName, doc, filter, updateFields, options);
        }

        public void Update<TDoc>(string collectionName, TDoc doc, Expression<Func<TDoc, bool>> filter, UpdateDefinition<TDoc> updateFields, UpdateOptions options = null)
        {
            var colleciton = GetMongoCollection<TDoc>(collectionName);
            colleciton.UpdateOne(filter, updateFields, options);
        }


        public void UpdateMany<TDoc>(TDoc doc, Expression<Func<TDoc, bool>> filter, UpdateOptions options = null)
        {
            string collectionName = typeof(TDoc).Name;
            UpdateMany<TDoc>(collectionName, doc, filter, options);
        }


        public void UpdateMany<TDoc>(string collectionName, TDoc doc, Expression<Func<TDoc, bool>> filter, UpdateOptions options = null)
        {
            var colleciton = GetMongoCollection<TDoc>(collectionName);
            List<UpdateDefinition<TDoc>> updateList = BuildUpdateDefinition<TDoc>(doc, null);
            colleciton.UpdateMany(filter, Builders<TDoc>.Update.Combine(updateList), options);
        }


        public void Delete<TDoc>(Expression<Func<TDoc, bool>> filter, DeleteOptions options = null)
        {
            string collectionName = typeof(TDoc).Name;
            Delete<TDoc>(collectionName, filter, options);
        }

        public void Delete<TDoc>(string collectionName, Expression<Func<TDoc, bool>> filter, DeleteOptions options = null)
        {
            var colleciton = GetMongoCollection<TDoc>(collectionName);
            DeleteResult deleteResult= colleciton.DeleteOne(filter, options);
            Console.WriteLine(deleteResult.DeletedCount);
        }


        public void DeleteMany<TDoc>(Expression<Func<TDoc, bool>> filter, DeleteOptions options = null)
        {
            string collectionName = typeof(TDoc).Name;
            DeleteMany<TDoc>(collectionName, filter, options);
        }


        public void DeleteMany<TDoc>(string collectionName, Expression<Func<TDoc, bool>> filter, DeleteOptions options = null)
        {
            var colleciton = GetMongoCollection<TDoc>(collectionName);
            colleciton.DeleteMany(filter, options);
        }

        public void ClearCollection<TDoc>(string collectionName)
        {
            var colleciton = GetMongoCollection<TDoc>(collectionName);
            var inddexs = colleciton.Indexes.List();
            List<IEnumerable<BsonDocument>> docIndexs = new List<IEnumerable<BsonDocument>>();
            while (inddexs.MoveNext())
            {
                docIndexs.Add(inddexs.Current);
            }
            var mongoDatabase = GetMongoDatabase();
            mongoDatabase.DropCollection(collectionName);

            if (!CollectionExists(mongoDatabase, collectionName))
            {
                CreateCollection<TDoc>(collectionName);
            }

            if (docIndexs.Count > 0)
            {
                colleciton = mongoDatabase.GetCollection<TDoc>(collectionName);
                foreach (var index in docIndexs)
                {
                    foreach (IndexKeysDefinition<TDoc> indexItem in index)
                    {
                        try
                        {
                            colleciton.Indexes.CreateOne(new CreateIndexModel<TDoc>(indexItem));
                        }
                        catch
                        { }
                    }
                }
            }

        }

    }
}

测试

var mongoDbHelper = new MongoDBHelper("mongodb://127.0.0.1:27017", "LogDB",true,true);

            mongoDbHelper.CreateCollection<SysLogInfo>("SysLog1", new[] { "LogDT" });

            mongoDbHelper.Insert<SysLogInfo>("SysLog1", new SysLogInfo { LogDT = DateTime.Now, Level = "Info", Msg = "测试消息" });

            mongoDbHelper.Find<SysLogInfo>("SysLog1", t => t.Level == "Info")
                .ForEach(doc => Console.WriteLine(System.Text.Json.JsonSerializer.Serialize(doc)));

            System.Collections.Generic.List<SysLogInfo> list = new System.Collections.Generic.List<SysLogInfo>();

            for (int i = 0; i < 100; i++)
            {
                list.Add(new SysLogInfo(i, DateTime.Now, "Info", "你好"));
            }


            mongoDbHelper.InsertMany<SysLogInfo>("SysLog1", list);

            int rsCount = 0;
            var result = mongoDbHelper.FindByPage<SysLogInfo, Object>("SysLog1", t => t.Level == "Info", t => t._id, 1, 20, out rsCount);

            result.ForEach(doc => Console.WriteLine(System.Text.Json.JsonSerializer.Serialize(doc)));

            mongoDbHelper.Update<SysLogInfo>("SysLog1", new SysLogInfo { _id = "Code", LogDT = DateTime.Now, Level = "Error", Msg = "测试消息2" }, t => t.LogDT >= new DateTime(1900, 1, 1));


            mongoDbHelper.Delete<SysLogInfo>("SysLog1", t => t.Level == "Info");

            mongoDbHelper.ClearCollection<SysLogInfo>("SysLog1");

实体类

using System;
using System.Collections.Generic;
using System.Text;

namespace MongoDBDriverDemo
{
    public class SysLogInfo
    {
        public object _id { get; set; }

        public DateTime LogDT { get; set; }

        public string Level { get; set; }

        public string Msg { get; set; }       

        public SysLogInfo()
        {

        }

        public SysLogInfo(object id, DateTime logDT,string level,string msg)
        {
            this._id = id;
            this.Msg = msg;
            this.LogDT = logDT;
            this.Level = level;
        }
    }
}

二.Java驱动连接MongoDB

1.新建项目

2.导入pom坐标

<dependencies>
    <dependency>
        <groupId>org.mongodb</groupId>
        <artifactId>mongo-java-driver</artifactId>
        <version>3.12.1</version>
    </dependency>
</dependencies>

3.测试

package cn.lb.entity;


import com.mongodb.Block;
import com.mongodb.client.*;
import com.mongodb.client.result.DeleteResult;
import com.mongodb.client.result.UpdateResult;
import org.bson.Document;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import static com.mongodb.client.model.Filters.*;
import static com.mongodb.client.model.Updates.inc;

public class mongodbTest {

    private  static  MongoCursor<Document> cursor=null;

    public static void main(String[] args) {
        try{
            MongoClient mongoClient= MongoClients.create("mongodb://47.100.46.200:27017");

            MongoDatabase database=mongoClient.getDatabase("mydb");

            MongoCollection<Document> collection=database.getCollection("test");

            Document doc = new Document("name", "MongoDB")
                    .append("type", "database")
                    .append("count", 1)
                    .append("versions", Arrays.asList("v3.2", "v3.0", "v2.6"))
                    .append("info", new Document("x", 203).append("y", 102));

            System.out.println("--------------插入一条------------------");

            collection.insertOne(doc);

            System.out.println("--------------插入多条------------------");

            List<Document> documentList=new ArrayList<Document>();
            for (int i = 0; i < 100; i++) {
                documentList.add(new Document("i",i));
            }

            collection.insertMany(documentList);

            System.out.println("文档总数:"+collection.countDocuments());

            Document myDoc=collection.find().first();

            System.out.println("第一个文档："+myDoc.toJson());

            cursor=collection.find().iterator();

            while(cursor.hasNext())
            {
                System.out.println(cursor.next().toJson());
            }

            for (Document cur:collection.find())
            {
                System.out.println(cur.toJson());
            }

            System.out.println("------------过滤---------------");

            myDoc=collection.find(eq("i",71)).first();

            System.out.println(myDoc);

            Block<Document> printBlock=new Block<Document>() {
                @Override
                public void apply(Document document) {
                    System.out.println(document.toString());
                }
            };

            collection.find(gt("i",50)).forEach(printBlock);


            collection.find(and(gt("i",50),lte("i",100))).forEach(printBlock);

            System.out.println("---------------更新文档-------------------");

            collection.updateOne(eq("i",10),new Document("$set",new Document("i",10)));

            UpdateResult updateResult=collection.updateMany(lt("i",100),inc("i",100));

            System.out.println(updateResult. getModifiedCount());

            System.out.println("-----------------删除文档-------------------");

            collection.deleteOne(eq("i",110));

            DeleteResult deleteResult=collection.deleteMany(gte("i",100));

            System.out.println(deleteResult.getDeletedCount());

            collection.createIndex(new Document("i",1));

        }catch (Exception ex)
        {
            ex.printStackTrace();
        }
        finally {
           if (cursor!=null)
           {
               cursor.close();
           }
        }
    }
}

4.结果

Java封装MongoDB

导入pom坐标

<dependencies>
        <dependency>
            <groupId>org.mongodb</groupId>
            <artifactId>mongo-java-driver</artifactId>
            <version>3.12.1</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.9</version>
        </dependency>
    </dependencies>

添加类

package cn.lb.util;

import com.mongodb.MongoClient;
import com.mongodb.MongoCredential;
import com.mongodb.ServerAddress;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.Filters;
import com.mongodb.client.result.UpdateResult;
import org.apache.commons.lang3.StringUtils;
import org.apache.log4j.Logger;
import org.bson.Document;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;


public class MongoDBUtil {
    private static MongoDBUtil mongoDBUtil;

    private static final String PLEASE_SEND_IP = "没有传入ip或者端口号";
    private static final String PLEASE_INSTANCE_MONGOCLIENT = "请实例化MongoClient";
    private static final String PLEASE_SEND_MONGO_REPOSITORY = "请指定要删除的mongo库";
    private static final String DELETE_MONGO_REPOSITORY_EXCEPTION = "删除mongo库异常";
    private static final String DELETE_MONGO_REPOSITORY_SUCCESS = "批量删除mongo库成功";
    private static final String NOT_DELETE_MONGO_REPOSITORY = "未删除mongo库";
    private static final String DELETE_MONGO_REPOSITORY = "成功删除mongo库：";
    private static final String CREATE_MONGO_COLLECTION_NOTE = "请指定要创建的库";
    private static final String NO_THIS_MONGO_DATABASE = "未找到指定mongo库";
    private static final String CREATE_MONGO_COLLECTION_SUCCESS = "创建mongo库成功";
    private static final String CREATE_MONGO_COLLECTION_EXCEPTION = "创建mongo库错误";
    private static final String NOT_CREATE_MONGO_COLLECTION = "未创建mongo库collection";
    private static final String CREATE_MONGO_COLLECTION_SUCH = "创建mongo库collection：";
    private static final String NO_FOUND_MONGO_COLLECTION = "未找到mongo库collection";
    private static final String INSERT_DOCUMEN_EXCEPTION = "插入文档失败";
    private static final String INSERT_DOCUMEN_SUCCESSS = "插入文档成功";


    private static final Logger logger = Logger.getLogger(MongoDBUtil.class);

    private MongoDBUtil(){

    }

    private static class SingleHolder{
        private static MongoDBUtil mongoDBUtil = new MongoDBUtil();
    }

    public static MongoDBUtil instance(){

        return SingleHolder.mongoDBUtil;
    }

    public static MongoDBUtil getMongoDBUtilInstance(){
        if(mongoDBUtil == null){
            return new MongoDBUtil();
        }
        return mongoDBUtil;
    }

    /**
     * 获取mongoDB连接
     * @param host
     * @param port
     * @return
     */
    public MongoClient getMongoConnect(String host,Integer port){

        if(StringUtils.isBlank(host) || null == port){
            logger.error(PLEASE_SEND_IP);
            return null;
        }

        return new MongoClient(host, port);
    }


    /**
     * 批量删除mongo库
     * @param mongoClient
     * @param dbNames
     * @return
     */
    public String bulkDropDataBase(MongoClient mongoClient,String...dbNames){

        if(null == mongoClient) return PLEASE_INSTANCE_MONGOCLIENT;

        if(null==dbNames || dbNames.length==0){
            return PLEASE_SEND_MONGO_REPOSITORY;
        }
        try {
            Arrays.asList(dbNames).forEach(dbName -> mongoClient.dropDatabase(dbName));
            logger.info(DELETE_MONGO_REPOSITORY_SUCCESS);
        }catch (Exception e){
            e.printStackTrace();
            logger.error(DELETE_MONGO_REPOSITORY_EXCEPTION);
        }
        return dbNames == null ? NOT_DELETE_MONGO_REPOSITORY:DELETE_MONGO_REPOSITORY + String.join(",",dbNames);
    }


    /**
     * 创建指定database的collection
     * @param mongoClient
     * @param dbName
     * @param collections
     * @return
     */
    public String createCollections(MongoClient mongoClient,String dbName,String...collections){

        if(null == mongoClient) return PLEASE_INSTANCE_MONGOCLIENT;

        if(null==collections || collections.length==0){
            return CREATE_MONGO_COLLECTION_NOTE;
        }

        MongoDatabase mongoDatabase = mongoClient.getDatabase(dbName);
        if(null == mongoDatabase) return NO_THIS_MONGO_DATABASE;

        try {
            Arrays.asList(collections).forEach(collection ->  mongoDatabase.createCollection(collection));
            logger.info(CREATE_MONGO_COLLECTION_SUCCESS);
            return collections == null ? NOT_CREATE_MONGO_COLLECTION:CREATE_MONGO_COLLECTION_SUCH + String.join(",",collections);
        }catch (Exception e){
            e.printStackTrace();
            logger.error(CREATE_MONGO_COLLECTION_EXCEPTION);
        }

        return null;
    }

    /**
     * 获取MongoCollection
     * @param mongoClient
     * @param dbName
     * @param collection
     * @return
     */
    public MongoCollection<Document> getMongoCollection(MongoClient mongoClient,String dbName,String collection){

        if(null == mongoClient) return null;

        if(StringUtils.isBlank(dbName)) return null;

        if(StringUtils.isBlank(collection)) return null;

        MongoDatabase mongoDatabase = mongoClient.getDatabase(dbName);

        MongoCollection<Document> collectionDocuments = mongoDatabase.getCollection(collection);

        if(null == collectionDocuments) return null;

        return collectionDocuments;
    }

    /**
     * 获取到MongoClient
     * @param ip
     * @param port
     * @param userName
     * @param dbName
     * @param psw
     * @returnMongoClient
     */
    public static MongoClient getMongoClientByCredential(String ip,int port,String userName,String dbName,String psw){
        ServerAddress serverAddress = new ServerAddress(ip,port);
        List<ServerAddress> addrs = new ArrayList<ServerAddress>();
        addrs.add(serverAddress);

        //MongoCredential.createScramSha1Credential()三个参数分别为 用户名 数据库名称 密码
        MongoCredential credential = MongoCredential.createScramSha1Credential(userName, dbName, psw.toCharArray());
        List<MongoCredential> credentials = new ArrayList<MongoCredential>();
        credentials.add(credential);

        //通过连接认证获取MongoDB连接
        MongoClient mongoClient = new MongoClient(addrs,credentials);
        return mongoClient;
    }


    /**
     * 插入文档数据
     * @param mongoCollection
     * @param params
     */
    public void insertDoucument(final MongoCollection<Document> mongoCollection, final Map<String,Object> params){
        if(null == mongoCollection) {
            logger.info(NO_FOUND_MONGO_COLLECTION);
            return;
        }

        try {
            Document document = new Document();
            params.keySet().stream().forEach(field -> document.append(field, params.get(field)));

            List<Document> documents = new ArrayList<>();
            documents.add(document);
            mongoCollection.insertMany(documents);
            logger.info(INSERT_DOCUMEN_SUCCESSS);
        }catch (Exception e){
            e.printStackTrace();
            logger.error(INSERT_DOCUMEN_EXCEPTION);
        }
    }

    /**
     * 更新文档
     * @param mongoCollection
     * @param conditionParams
     * @param updateParams
     */
    public  void updateDocument(final MongoCollection<Document> mongoCollection,final Map<String,Object> conditionParams,
                                final Map<String,Object> updateParams,final boolean MultiUpdate
    ){

        if(null == mongoCollection) return;

        if (null == conditionParams) return;

        if (null == updateParams) return;


        Document conditonDocument = new Document();
        conditionParams.keySet().stream().filter(p -> null != p).forEach(o -> {
            conditonDocument.append(o,conditionParams.get(o));
        });


        Document updateDocument = new Document();
        updateParams.keySet().stream().filter(p -> null != p).forEach(o -> {
            updateDocument.append(o,updateParams.get(o));
        });
        UpdateResult updateResult = null;
        if (MultiUpdate){//是否批量更新
            updateResult = mongoCollection.updateMany(conditonDocument,new Document("$set",updateDocument));
        }else {
            updateResult = mongoCollection.updateOne(conditonDocument,new Document("$set",updateDocument));
        }
        System.out.println("修改了："+updateResult.getModifiedCount()+" 条数据 ");

    }

    /**
     *条件 删除文档 是否多条删除
     * @param mongoCollection
     * @param multiple
     * @param conditionParams
     * @return
     */
    public long deleteDocument(final MongoCollection<Document> mongoCollection,final boolean multiple,
                               final Map<String,Object> conditionParams){

        if(null == mongoCollection) return 0;

        if(null == conditionParams) return 0;

        Document document = new Document();

        conditionParams.keySet().stream().filter(p -> null != p).forEach(o -> {
            document.append(o,conditionParams.get(o));
        });

        if(multiple) {
            return mongoCollection.deleteMany(document).getDeletedCount();
        }

        //删除文档第一条
        return mongoCollection.deleteOne(document).getDeletedCount();
    }

    /**
     * 查询文档 带条件、范围查找、排序、分页
     * @param mongoCollection
     * @param conditionParams
     * @param limit
     * @param skip
     * @param sortParams
     */
    public FindIterable<Document> queryDocument(final MongoCollection<Document> mongoCollection, final Map<String,Object> conditionParams,
                                                final String op,final String compareField, final Map<String,Integer> gtLtOrOtherParams,
                                                final Map<String,Object> sortParams,final Integer skip,final Integer limit
    ){

        if(null == mongoCollection) return null;

        FindIterable<Document> findIterable = mongoCollection.find();
        Document conditionDocument = new Document();
        Document compareDocument = new Document();

        if(null != conditionParams && null != findIterable){

            conditionParams.forEach((k,v) ->{
                if (StringUtils.isNotBlank(k)) {
                    conditionDocument.append(k,v);
                }
            });

            findIterable = findIterable.filter(conditionDocument);

            MongoCursor<Document> mongoCursor = findIterable.iterator();
            while(mongoCursor.hasNext()){
                System.out.println("条件过滤  -->"+mongoCursor.next());
            }
        }

        if(null != findIterable && null != gtLtOrOtherParams){

            Document gtOrLtDoc = new Document();
            gtLtOrOtherParams.forEach((k,v) -> {
                if(StringUtils.isNotBlank(k)) gtOrLtDoc.append(k,v);
            });

            compareDocument = new Document(compareField,gtOrLtDoc);
            findIterable = findIterable.filter(new Document(compareField,compareDocument));
        }

        if (StringUtils.isNotBlank(op)){
            if ("and".equals(op)){
                findIterable = mongoCollection.find(Filters.and(conditionDocument,compareDocument));
            }else if("or".equals(op)){
                findIterable = mongoCollection.find(Filters.or(conditionDocument,compareDocument));
            }else if("not".equals(op)){//排除范围
                findIterable = mongoCollection.find(Filters.and(conditionDocument,Filters.not(compareDocument)));
            }
        }else{//默认是AND查询
            findIterable = mongoCollection.find(Filters.and(conditionDocument,compareDocument));
        }
        MongoCursor<Document> mongoCursor3 = findIterable.iterator();
        while(mongoCursor3.hasNext()){
            System.out.println(op+"过滤  -->"+mongoCursor3.next());
        }

        if(null != sortParams){
            Document sortDocument = new Document();
            sortParams.forEach((k,v) ->{
                if (StringUtils.isNotBlank(k)) {
                    sortDocument.append(k,v);
                }
            });

            findIterable = findIterable.sort(sortDocument);

            MongoCursor<Document> mongoCursor2 = findIterable.iterator();
            while(mongoCursor2.hasNext()){
                System.out.println("排序  -->"+mongoCursor2.next());
            }
        }



        if(null != findIterable && null != limit){
            findIterable = findIterable.limit(limit);
        }
        if(null != findIterable && null != skip){
            findIterable = findIterable.skip(skip);
        }

        return findIterable;
    }


    /**
     * in查询
     * @param mongoCollection
     * @return
     */
    public FindIterable<Document>  queryDocumentIn(final MongoCollection<Document> mongoCollection,String field, List<String> list
    ){

        if(null == mongoCollection) return null;
        FindIterable<Document> findIterable = mongoCollection.find(new Document(field,new Document("$in",list)));
        return findIterable;
    }


    /**
     * 全文查询
     * @param mongoCollection
     * @return
     */
    public FindIterable<Document>  queryDocument(final MongoCollection<Document> mongoCollection
    ){
        if(null == mongoCollection) return null;
        FindIterable<Document> findIterable = mongoCollection.find();
        return findIterable;
    }


    /**
     * 查询文档 简单条件查询
     * @param mongoCollection
     * @param conditionParams
     * @return
     */
    public FindIterable<Document> queryDocument(final MongoCollection<Document> mongoCollection, final Map<String,Object> conditionParams
    ){

        if(null == mongoCollection) return null;

        FindIterable<Document> findIterable = mongoCollection.find();

        if(null == conditionParams || null == findIterable) return findIterable;

        Document document = new Document();
        conditionParams.forEach((k,v)->{
            if (StringUtils.isNotBlank(k)) {
                document.append(k,v);
            }
        });
        findIterable = findIterable.filter(document);

        return findIterable;

    }


    /**
     * 用于输出部分的列信息
     * @param documents
     */
    public static void printDocuments(FindIterable<Document> documents, String[] fields) {
        if (fields != null && fields.length > 0) {
            int num = 0;
            for (Document d : documents) {
                StringBuilder stringBuilder = new StringBuilder();
                for (int i = 0; i < fields.length; i++) {
                    /*if(fields[i].equals("catm")){

                    }*/
                    stringBuilder.append(fields[i] + ": "+d.getString(fields[i])+" ");
                }
                System.out.println("第" + (++num) + "条数据： " + stringBuilder);

            }
        }else{
            for (Document d : documents) {
                System.out.println(d.toString());
            }
        }
    }

    /**
     * 用于输出所有的列信息
     * @param documents
     */
    public void printDocuments(FindIterable<Document> documents) {
        int num = 0;
        for (Document d : documents) {
            System.out.println("第" + (++num) + "条数据： " + d.toString());
        }
    }

}

C#API参考地址：https://api.mongodb.com/csharp/2.2/html/N_MongoDB_Driver.htm

C#驱动连接文档地址：http://mongodb.github.io/mongo-csharp-driver/2.10/getting_started/quick_tour/

Java驱动连接文档地址：http://mongodb.github.io/mongo-java-driver/3.12/driver/getting-started/installation/

Java MongoDB：com.mongodb.DB和com.mongodb.client有什么区别

我是使用MongoDB的新手，正在从事Java项目，并且开始了一些教程来开始使用Driver。

我一直在使用，com.mongodb.client直到发现里面没有findOne方法，com.mongodb.client.MongoCollection所以我重写了项目以仅使用它com.mongodb.DB，并且DBCollection库中包含了我需要的findOne方法。

我想知道这两个库有什么区别？

谢谢！

答案1

小编典典

com.mongodb.DB是用于在3.x之前访问Mongo的旧API。您将找到大量关于这些课程的教程。该代码具有完整的功能，您可以将其用于访问Mongo
2.x和Mongo 3.x数据库，但是不建议您使用它来启动新项目。

从3.0开始，推荐的方式是通过
com.mongodb.MongoClient和com.mongodb.client.MongoDatabase。在此处查看Java驱动程序的官方教程。

java – 如何使用mongodb和NumberLong计算平均值

我试图使用 mongodb java驱动程序计算集合的平均值,如下所示：

DBObject condition = 
    new BasicDBObject("pluginIdentifier",plugin.getIdentifier());

DBObject initial = new BasicDBObject();

initial.put("count",0);
initial.put("totalDuration",0);
String reduce = "function(duration,out) { out.count++; 
    out.totalDuration+=duration.floatApprox; }";
String finalize = "function(out) { out.avg = out.totalDuration.floatApprox / 
    out.count; }";

DBObject avg = durationEntries.group(
    new BasicDBObject("pluginIdentifier",true),condition,initial,reduce,finalize);

System.out.println(avg);

“duration”是NumberLong(在java中,它是一个Long,可能是java驱动程序转换它).
我经过一些搜索后发现,为了提取数字,使用.floatApprox是一种方法,这也适用于mongodb控制台：

> db.DurationEntries.findOne().duration.floatApprox
5

但是,运行上面的java代码不会计算平均值,而是返回它

[{"pluginIdentifier":"dummy","count":7.0,"totalDuration":NaN,"avg":NaN}]

我尝试了几种变体,有和没有.floatApprox,但直到现在才能获得一些奇怪的字符串连接.

我的问题是：我做错了什么/我应该如何计算一个NumberLong列的平均值？

解决方法

如果你遇到map / reduce问题,你可能应该进入mongodb控制台,在那里进行操作,然后将其转换为你的驱动程序.

举例来说,以下文件：

db.tasks.find()
{ "_id" : ObjectId("4dd51c0a3f42cc01ab0e6506"),"duration" : 10,"name" : "StartProcess","date" : "20110501" }
{ "_id" : ObjectId("4dd51c0e3f42cc01ab0e6507"),"duration" : 11,"date" : "20110502" }
{ "_id" : ObjectId("4dd51c113f42cc01ab0e6508"),"duration" : 12,"date" : "20110503" }

您可以编写mapReduce来计算StartProcess的平均持续时间,如下所示：

m = function (){
  emit( this.name,{ totalDuration : this.duration,num : 1 } );
};

r = function (name,values){
  var n = {totalDuration : 0,num : 0};
  for ( var i=0; i<values.length; i++ ){
    n.totalDuration += values[i].totalDuration;
    n.num += values[i].num;
  }
  return n;
};

f = function(who,res){
  res.avg = res.totalDuration / res.num;
  return res;
};

然后,假设您使用的是MongoDB 1.7或更高版本：

db.tasks.mapReduce( m,r,{ finalize : f,out : {inline : 1} });

会给你以下答案：

"results" : [
  {
    "_id" : "StartProcess","value" : {
        "totalDuration" : 33,"num" : 3,"avg" : 11
      }
  }
]

如果这没有帮助,您可以发布您的地图功能和文档结构.

Java 连接 MongoDB 报错 “java.lang.IllegalArgumentException: clusterListener can not be null” 的解决办法

我使用的 MongoDB 版本是 3.6.9。

下面是一个很基础的示例代码，功能就是连接 MongoDB：

package com.zifeiy.snowflake.handle.etl.mongodb;

import com.mongodb.MongoClient;

public class MongodbTest {
	public static void main(String[] args) {
		MongoClient mongoClient = new MongoClient();
	}
}

但是执行后报错：

Exception in thread "main" java.lang.IllegalArgumentException: clusterListener can not be null
	at com.mongodb.assertions.Assertions.notNull(Assertions.java:37)
	at com.mongodb.connection.ClusterSettings$Builder.addClusterListener(ClusterSettings.java:218)
	at com.mongodb.connection.DefaultClusterFactory.getClusterSettings(DefaultClusterFactory.java:190)
	at com.mongodb.connection.DefaultClusterFactory.create(DefaultClusterFactory.java:117)
	at com.mongodb.Mongo.createCluster(Mongo.java:744)
	at com.mongodb.Mongo.createCluster(Mongo.java:728)
	at com.mongodb.Mongo.<init>(Mongo.java:293)
	at com.mongodb.Mongo.<init>(Mongo.java:288)
	at com.mongodb.Mongo.<init>(Mongo.java:284)
	at com.mongodb.MongoClient.<init>(MongoClient.java:179)
	at com.mongodb.MongoClient.<init>(MongoClient.java:156)
	at com.mongodb.MongoClient.<init>(MongoClient.java:117)
	at com.zifeiy.snowflake.handle.etl.mongodb.MongodbTest.main(MongodbTest.java:7)

解决办法是：将 pom.xml 中的 mongodb-driver 版本改成 3.6 的就可以了：

<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongodb-driver</artifactId>
    <version>3.6.4</version>
</dependency>

改成 3.6 之后再次运行出现如下提示，说明连接成功：

07:38:15.249 [main] INFO org.mongodb.driver.cluster - Cluster created with settings {hosts=[127.0.0.1:27017], mode=SINGLE, requiredClusterType=UNKNOWN, serverSelectionTimeout=''30000 ms'', maxWaitQueueSize=500}
07:38:15.276 [main] DEBUG org.mongodb.driver.cluster - Updating cluster description to  {type=UNKNOWN, servers=[{address=127.0.0.1:27017, type=UNKNOWN, state=CONNECTING}]

关于Java Mongodb numberlong查询和java查询mongodb数据的问题就给大家分享到这里，感谢你花时间阅读本站内容，更多关于C#、Java驱动连接MongoDB以及封装(C#的MongoDBHelper,Java的MongoDBUtil)、Java MongoDB：com.mongodb.DB和com.mongodb.client有什么区别、java – 如何使用mongodb和NumberLong计算平均值、Java 连接 MongoDB 报错 “java.lang.IllegalArgumentException: clusterListener can not be null” 的解决办法等相关知识的信息别忘了在本站进行查找喔。

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