PHP Array to JSON Array using json_encode（）;

25-02-24 11

如果您对PHPArraytoJSONArrayusingjson_encode和;感兴趣，那么这篇文章一定是您不可错过的。我们将详细讲解PHPArraytoJSONArrayusingjson_enc

如果您对PHP Array to JSON Array using json_encode和;感兴趣，那么这篇文章一定是您不可错过的。我们将详细讲解PHP Array to JSON Array using json_encode的各种细节，并对;进行深入的分析，此外还有关于AJAX向SpringMVC controller 传JSONArray并将String转换成JSONArray、delphi的TJSONArray出错：undeclare identify 'TJSONArray'...、Flex 数组 Array 用法---gson转换为flex array的方法--两个Array（）/as Array、Gson – How to parse JSON Arrays, an array of arrays的实用技巧。

本文目录一览：

PHP Array to JSON Array using json_encode（）;
AJAX向SpringMVC controller 传JSONArray并将String转换成JSONArray
delphi的TJSONArray出错：undeclare identify 'TJSONArray'...
Flex 数组 Array 用法---gson转换为flex array的方法--两个Array（）/as Array
Gson – How to parse JSON Arrays, an array of arrays

PHP Array to JSON Array using json_encode（）;

我已经对使用内置json_encode();函数制作的数组进行了编码。我需要像这样的数组数组格式：

[["Afghanistan",32,12],["Albania",32,12]]

但是，它返回为：

["2":["Afghanistan",32,12],"4":["Albania",32,12]]

如何在不使用任何正则表达式欺骗的情况下删除这些行号？

答案1

小编典典

如果您的PHP数组中的数组键不是连续的数字，则json_encode() 必须
使另一个构造成为一个对象，因为JavaScript数组总是连续地进行数字索引。

array_values()在PHP的外部结构上使用，以丢弃原始的数组键，并将其替换为从零开始的连续编号：

例：

// Non-consecutive 3number keys are OK for PHP// but not for a JavaScript array$array = array(  2 => array("Afghanistan", 32, 13),  4 => array("Albania", 32, 12));// array_values() removes the original keys and replaces// with plain consecutive numbers$out = array_values($array);json_encode($out);// [["Afghanistan", 32, 13], ["Albania", 32, 12]]

AJAX向SpringMVC controller 传JSONArray并将String转换成JSONArray

http://stackoverflow.com/questions/14515785/how-to-convert-json-string-arrray-to-json-array-list

create JSONArray ([{},{},{}]) in JS

var data = [];
data.push({
		"id" : 1,"val" : $('#projectName').val()
	});
	data.push({
		"id" : 2,"val" : $('#description').val()
	});
	data.push({
		"id" : 3,"val" : $('#startdate').val()
	});
	data.push({
		"id" : 4,"val" : STATUS_NOT_START
	});
	var id = 5;
	while($("#" + id).length > 0){
		data.push({
			"id" : id,"val" : $("#" + id).val()
		});
		id++;
	}

ajax pass JSONArray String to Controller:

$.ajax({
		type : "Post",url : "createProject.html",data : "jsonArray=" + JSON.stringify(data) + "&depId=" + depId + "&groId=" + groId + "&objId=" + objId,success : function(response){
			var alertText = "Project " + $('#projectName').val() + " is successfully created! Project ID: " + response;
			adDalert("alert-success",alertText,"#alertdiv");
		},error : function(e){
			var alertText = 'Error: ' + e;
     		adDalert("alert-error","#alertdiv");
		}
	});

Controller将JSONArray String转换成JSONArray

import net.sf.json.JSONArray; JSONException; JSONObject; JSONSerializer; public class TestJson { static void parseProfilesJson(String the_json){ try { JSONArray nameArray =(JSONArray) JSONSerializer.toJSON(the_json); System.out.println(nameArray.size()); for(Object js : nameArray){ JSONObject json = (JSONObject)js; System.out.println(json.get("date")); } } catch (JSONException e) { e.printstacktrace(); } } void main(String[] args) { String s = "[{\"date\":\"2012-04-23\",\"activity\":\"gym\"},{\"date\":\"2012-04-24\",\"activity\":\"walking\"}]"; parseProfilesJson(s); } }

delphi的TJSONArray出错：undeclare identify 'TJSONArray'...

总结

以上是小编为你收集整理的delphi的TJSONArray出错：undeclare identify ''TJSONArray''...全部内容。

如果觉得小编网站内容还不错，欢迎将小编网站推荐给好友。

Flex 数组 Array 用法---gson转换为flex array的方法--两个Array（）/as Array

示例
如何使用示例

下面的示例演示 Array() 函数在参数不是原始值时的行为。转换为数组的一种常见用法是转换以数组格式存储值的 Object 实例。如果调用 Array() 时使用了 Object 类型或其它任何非原始数据类型的参数，则对对象的引用将存储在新数组的元素中。也就是说，如果传递的唯一参数是一个对象，则对该对象的引用将成为新数组的第一个元素。
var obj:Object = [ "a","b","c" ];

var newArray:Array = Array( obj );

trace(newArray == obj); // false
trace(newArray[0] == obj); // true
trace(newArray[0][0]) // a
trace(newArray[0][1]) // b
trace(newArray[0][2]) // c

若要将 obj 转换为数组，请使用 as 运算符，它将在 obj 为有效数组的情况下返回数组引用，否则返回 null：
var obj:Object = [ "a","c" ];

var newArray:Array = obj as Array;

trace(newArray == obj); // true
trace(newArray[0]); // a
trace(newArray[1]); // b

trace(newArray[2]); // c

Gson – How to parse JSON Arrays, an array of arrays

https://mkyong.com/java/gson-how-to-parse-json-arrays-an-array-of-arrays/

In this article, we will show few JSON array examples and also how to use Gson to map it back to Java Object.

pom.xml


  <!-- Gson JSON -> Object -->
  <dependency>
      <groupId>com.google.code.gson</groupId>
      <artifactId>gson</artifactId>
      <version>2.8.6</version>
  </dependency>

JSON basic.

[ ] = array
{ } = object

1. JSON array of object.

1.1 Sample.

array1.json


[
  {
    "id": 1, "name": "a"
  },
  {
    "id": 2, "name": "b"
  }
]

1.2 Gson convert above JSON array into a List<Item>.

Item.java


package com.mkyong;

public class Item {

    private int id;
    private String name;

}

JsonArray1.java


package com.mkyong;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import org.apache.commons.io.IOUtils;

import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Type;
import java.nio.charset.StandardCharsets;
import java.util.List;

public class JsonArray1 {

    public static void main(String[] args) throws IOException {

        JavaParseJsonArray main = new JavaParseJsonArray();

        Gson gson = new Gson();

        Type listType = new TypeToken<List<Item>>() {}.getType();

        List<Item> list = gson.fromJson(main.loadFileFromClasspath("array1.json"), listType);

        System.out.println(gson.toJson(list));

    }

    public String loadFileFromClasspath(String fileName) throws IOException {
        ClassLoader classLoader = getClass().getClassLoader();
        try (InputStream inputStream = classLoader.getResourceAsStream(fileName)) {
            // common-io
            return IOUtils.toString(inputStream, StandardCharsets.UTF_8);
        }
    }

}

P.S We use common-io to convert inputStream to String.

pom.xml


<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.6</version>
</dependency>

2. JSON array of {object with an array of object}.

2.1 Sample.

array2.json


[
  {
    "id": 1,
    "name": "a",
    "types":
    [
      {"id": 1,"name": "a1"},
      {"id": 2,"name": "a2"}
    ]
  },
  {
    "id": 2,
    "name": "b",
    "types":
    [
      {"id": 1,"name": "b1"},
      {"id": 2,"name": "b2"}
    ]
  }
]

2.2 Gson convert above JSON array into a List<Item> containing List<ItemType> types.

Item.java


package com.mkyong;

import java.util.List;

public class Item {

    private int id;
    private String name;
    private List<ItemType> types;

}

ItemType.java


package com.mkyong;

public class ItemType {

    private int id;
    private String name;

}

2.3 Same code, no need to change.


  Type listType = new TypeToken<List<Item>>() {}.getType();
  List<Item> list = gson.fromJson(main.loadFileFromClasspath("array2.json"), listType);

3. JSON array of {object with an array of an array of object}.

3.1 Sample.

array3.json


[
  {
    "id": 1,
    "name": "a",
    "types":
    [
      [
        {"id": 1,"name": "a1"},
        {"id": 2,"name": "a2"}
      ],
      [
        {"id": 3,"name": "a3"}
      ]
    ]
  },
  {
    "id": 2,
    "name": "b",
    "types":
    [
      [
        {"id": 1,"name": "b1"}
      ],
      [
        {"id": 2,"name": "b2"}
      ]
    ]
  }
]

3.2 Change the types to List<ItemType> types[];

Item.java


package com.mkyong;

import java.util.List;

public class Item {

    private int id;
    private String name;
    private List<ItemType> types[]; // change types -> types[]

}

ItemType.java


package com.mkyong;

public class ItemType {

    private int id;
    private String name;

}

3.3 Same code, no need to change.


  Type listType = new TypeToken<List<Item>>() {}.getType();
  List<Item> list = gson.fromJson(main.loadFileFromClasspath("array3.json"), listType);

3.4 See the debugging mode.

4. JSON array of {object with an array of an array of String}.

4.1 This is a bit unusual JSON array sample.

array4.json


[
  {
    "id": 1,
    "name": "a",
    "types":
    [
      [
        "a1", 1
      ],
      [
        "a2", 2
      ]
    ]
  },
  {
    "id": 2,
    "name": "b",
    "types":
    [
      [
        "b1", 1
      ]
    ]
  }
]

4.2 Change the types to List<String> types[];

Item.java


package com.mkyong;

import java.util.List;

public class Item {

    private int id;
    private String name;
    private List<String> types[];

}

4.3 Same code, no need to change.


  Type listType = new TypeToken<List<Item>>() {}.getType();
  List<Item> list = gson.fromJson(main.loadFileFromClasspath("array4.json"), listType);

References

Wikipedia – JSON
Gson – How to parse JSON
Java JSON Tutorials

array gson json json array json parser

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