本文将为您提供关于Java中的MySQL连接错误-com.mysql.jdbc.Driver的详细介绍,我们还将为您解释java连接mysql失败的相关知识,同时,我们还将为您提供关于ClassNot
本文将为您提供关于Java中的MySQL连接错误-com.mysql.jdbc.Driver的详细介绍,我们还将为您解释java连接mysql失败的相关知识,同时,我们还将为您提供关于ClassNotFoundException:com.mysql.jdbc.DriverWeb应用程序的JDBC MySQL驱动程序、ClassNotFoundException:com.mysql.jdbc.Driver。Web应用程序的JDBC MySQL驱动程序、com.mysql.cj.jdbc.Driver、com.mysql.jdbc.Driver to com.mysql.cj.jdbc.Driver的实用信息。
本文目录一览:- Java中的MySQL连接错误-com.mysql.jdbc.Driver(java连接mysql失败)
- ClassNotFoundException:com.mysql.jdbc.DriverWeb应用程序的JDBC MySQL驱动程序
- ClassNotFoundException:com.mysql.jdbc.Driver。Web应用程序的JDBC MySQL驱动程序
- com.mysql.cj.jdbc.Driver
- com.mysql.jdbc.Driver to com.mysql.cj.jdbc.Driver
Java中的MySQL连接错误-com.mysql.jdbc.Driver(java连接mysql失败)
我一直在尝试将Java应用程序连接到MySQL数据库,并使用以下代码行:
import java.sql.*; public class AcceptValues extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String url = "jdbc:mysql://localhost:3306/db_name"; String driver = "com.mysql.jdbc.Driver"; String userName = "root"; String password = ""; try { Class.forName(driver); Connection conn = DriverManager.getConnection(url,userName,password); out.print("Connection estd"); Statement st = conn.createStatement(); st.executeQuery("insert into table_name values(2, ''testing'');"); } conn.close(); } catch (Exception e) { out.print("Error : " +e.getMessage()); } }}
我还将类名设置为从mysql网站下载的mysql-connector-
java-5.1.29-bin.jar。但是我仍然无法使用上述代码行连接到数据库,并且将 ex。com.mysql.jdbc.Driver
抛出错误。
我是Java开发的新手,任何帮助将不胜感激。谢谢。
答案1
小编典典在WEB-INF/lib
文件夹中添加mysql-connector-java-5.1.29-bin.jar
。仅将jar添加到您的构建路径中是不够的。甚至我一开始也遇到同样的问题。
ClassNotFoundException:com.mysql.jdbc.DriverWeb应用程序的JDBC MySQL驱动程序
因此,我有一个用于MySQL JDBC驱动程序的.jar文件,该文件位于我的库源文件夹下,并且具有以下代码:
public static Connection getConnection() throws SQLException {
Connection conn = null;
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
String url = "jdbc:mysql://50.56.81.42:3306/GUEST_BOOK";
String user = "user";
String password = "pass";
conn = (Connection) DriverManager.getConnection(url,user,password);
}catch(ClassNotFoundException e){
e.printStackTrace();
}catch(InstantiationException e){
e.printStackTrace();
}catch(IllegalAccessException e){
e.printStackTrace();
}
return conn;
}
但是,它总是给我这个错误:
INFO: Server startup in 645 ms
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1678)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1523)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at gbook.DbHelper.getConnection(DbHelper.java:14)
at gbook.DbHelper.getGuestBook(DbHelper.java:51)
at org.apache.jsp.index_jsp._jspService(index_jsp.java:83)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:433)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:964)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)
Dec 1,2011 1:41:05 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [jsp] in context with path [/JDBC-MySQL] threw exception [javax.servlet.ServletException: java.lang.NoClassDefFoundError: com/mysql/jdbc/Connection] with root cause
java.lang.ClassNotFoundException: com.mysql.jdbc.Connection
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1678)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1523)
at gbook.DbHelper.getGuestBook(DbHelper.java:52)
at org.apache.jsp.index_jsp._jspService(index_jsp.java:83)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
这是我添加jar文件的方法。我创建了一个lib文件夹,并将jar放入其中,然后在eclipse中配置构建路径,并将lib文件夹中的jar添加到了项目中。
ClassNotFoundException:com.mysql.jdbc.Driver。Web应用程序的JDBC MySQL驱动程序
因此,我有一个用于MySQL JDBC驱动程序的.jar文件,该文件位于我的库源文件夹下,并且具有以下代码:
public static Connection getConnection() throws SQLException {
Connection conn = null;
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
String url = "jdbc:mysql://50.56.81.42:3306/GUEST_BOOK";
String user = "user";
String password = "pass";
conn = (Connection) DriverManager.getConnection(url,user,password);
}catch(ClassNotFoundException e){
e.printStackTrace();
}catch(InstantiationException e){
e.printStackTrace();
}catch(IllegalAccessException e){
e.printStackTrace();
}
return conn;
}
但是,它总是给我这个错误:
INFO: Server startup in 645 ms
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1678)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1523)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at gbook.DbHelper.getConnection(DbHelper.java:14)
at gbook.DbHelper.getGuestBook(DbHelper.java:51)
at org.apache.jsp.index_jsp._jspService(index_jsp.java:83)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:433)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:964)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)
Dec 1,2011 1:41:05 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [jsp] in context with path [/JDBC-MySQL] threw exception [javax.servlet.ServletException: java.lang.NoClassDefFoundError: com/mysql/jdbc/Connection] with root cause
java.lang.ClassNotFoundException: com.mysql.jdbc.Connection
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1678)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1523)
at gbook.DbHelper.getGuestBook(DbHelper.java:52)
at org.apache.jsp.index_jsp._jspService(index_jsp.java:83)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
这是我添加jar文件的方法。我创建了一个lib文件夹,并将jar放入其中,然后在eclipse中配置构建路径,并将lib文件夹中的jar添加到了项目中。
com.mysql.cj.jdbc.Driver
# Loading class `com.mysql.jdbc.Driver''. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver''. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
- MySQL 5.7.16
- Spring Boot 2.1.0.RELEASE
用传统的 xml 文件配置,启动 Spring Boot 项目时,出现的提示,根据提示把配置文件中的 com.mysql.jdbc.Driver 换成 com.mysql.cj.jdbc.Driver 即可。
com.mysql.jdbc.Driver to com.mysql.cj.jdbc.Driver
com.mysql.jdbc.Driver
tocom.mysql.cj.jdbc.Driver
MySQL :: MySQL Connector/J 8.0 Developer Guide :: 4.3.1.3 Changes in the Connector/J API https://dev.mysql.com/doc/connector-j/8.0/en/connector-j-api-changes.html
4.3.1.3 Changes in the Connector/J API
This section describes the changes to the Connector/J API going from version 5.1 to 8.0. You might need to adjust your API calls accordingly:
-
The name of the class that implements
java.sql.Driver
in MySQL Connector/J has changed fromcom.mysql.jdbc.Driver
tocom.mysql.cj.jdbc.Driver
. The old class name has been deprecated. -
The names of these commonly-used interfaces have also been changed:
-
ExceptionInterceptor: from
com.mysql.jdbc.ExceptionInterceptor
tocom.mysql.cj.exceptions.ExceptionInterceptor
-
StatementInterceptor: from
com.mysql.jdbc.StatementInterceptorV2
tocom.mysql.cj.interceptors.QueryInterceptor
-
ConnectionLifecycleInterceptor: from
com.mysql.jdbc.ConnectionLifecycleInterceptor
tocom.mysql.cj.jdbc.interceptors.ConnectionLifecycleInterceptor
-
AuthenticationPlugin: from
com.mysql.jdbc.AuthenticationPlugin
tocom.mysql.cj.protocol.AuthenticationPlugin
-
BalanceStrategy: from
com.mysql.jdbc.BalanceStrategy
tocom.mysql.cj.jdbc.ha.BalanceStrategy
. -
-
信息: Loading XML bean definitions from class path resource [Beans.xml]
Loading class `com.mysql.jdbc.Driver''. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver''. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd ">
<bean id="dataSource">
<property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://rm-2zeo.mysql.rds.aliyuncs.com:3306/vtest"/>
<property name="username" value="u"/>
<property name="password" value="I"/>
</bean>
<!-- Definition for studentJDBCTemplate bean -->
<bean id="studentJDBCTemplate">
<property name="dataSource" ref="dataSource" />
</bean>
</beans>
mvn clean;mvn compile;mvn package;mvn install;
mvn 打包jar
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.tutorialspoint</groupId>
<artifactId>HelloSpringJDBCMysql</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencies>
<!-- Spring Core -->
<!-- http://mvnrepository.com/artifact/org.springframework/spring-core -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.1.4.RELEASE</version>
</dependency>
<!-- Spring Context -->
<!-- http://mvnrepository.com/artifact/org.springframework/spring-context -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.1.4.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.1.3.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.13</version>
</dependency>
</dependencies>
<build>
<!--使用的插件列表-->
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.1.0</version>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<archive>
<manifest>
<mainClass>com.tutorialspoint.MainApp</mainClass>
</manifest>
</archive>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<useUniqueVersions>false</useUniqueVersions>
<classpathPrefix>lib/</classpathPrefix>
<mainClass>com.tutorialspoint.MainApp</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
</project>
[root@d java]# tree -I target
.
├── pom.xml
├── spring.iml
└── src
├── main
│ ├── java
│ │ └── com
│ │ └── tutorialspoint
│ │ ├── MainApp.java
│ │ ├── StudentDAO.java
│ │ ├── Student.java
│ │ ├── StudentJDBCTemplate.java
│ │ └── StudentMapper.java
│ └── resources
│ └── beans.xml
└── test
└── java
8 directories, 8 files
[root@d java]#
com.tutorialspoint.StudentDAO
package com.tutorialspoint;
import java.util.List;
import javax.sql.DataSource;
public interface StudentDAO {
/**
* This is the method to be used to initialize
* database resources ie. connection.
*/
public void setDataSource(DataSource ds);
/**
* This is the method to be used to create
* a record in the Student table.
*/
public void create(String name, Integer age);
/**
* This is the method to be used to list down
* a record from the Student table corresponding
* to a passed student id.
*/
public Student getStudent(Integer id);
/**
* This is the method to be used to list down
* all the records from the Student table.
*/
public List<Student> listStudents();
/**
* This is the method to be used to delete
* a record from the Student table corresponding
* to a passed student id.
*/
public void delete(Integer id);
/**
* This is the method to be used to update
* a record into the Student table.
*/
public void update(Integer id, Integer age);
}
com.tutorialspoint.Student
package com.tutorialspoint;
public class Student {
/**
CREATE TABLE Student(
ID INT NOT NULL AUTO_INCREMENT,
NAME VARCHAR(20) NOT NULL,
AGE INT NOT NULL,
PRIMARY KEY (ID)
);
* */
private Integer age;
private String name;
private Integer id;
public void setAge(Integer age) {
this.age = age;
}
public Integer getAge() {
return age;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setId(Integer id) {
this.id = id;
}
public Integer getId() {
return id;
}
}
com.tutorialspoint.StudentMapper
package com.tutorialspoint;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.springframework.jdbc.core.RowMapper;
public class StudentMapper implements RowMapper<Student> {
public Student mapRow(ResultSet rs, int rowNum) throws SQLException {
Student student = new Student();
student.setId(rs.getInt("id"));
student.setName(rs.getString("name"));
student.setAge(rs.getInt("age"));
return student;
}
}
com.tutorialspoint.StudentJDBCTemplate
package com.tutorialspoint;
import java.util.List;
import javax.sql.DataSource;
import org.springframework.jdbc.core.JdbcTemplate;
public class StudentJDBCTemplate implements StudentDAO {
private DataSource dataSource;
private JdbcTemplate jdbcTemplateObject;
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
this.jdbcTemplateObject = new JdbcTemplate(dataSource);
}
public void create(String name, Integer age) {
String SQL = "insert into Student (name, age) values (?, ?)";
jdbcTemplateObject.update( SQL, name, age);
System.out.println("Created Record Name = " + name + " Age = " + age);
return;
}
public Student getStudent(Integer id) {
String SQL = "select * from Student where id = ?";
Student student = jdbcTemplateObject.queryForObject(SQL,
new Object[]{id}, new StudentMapper());
return student;
}
public List<Student> listStudents() {
String SQL = "select * from Student";
List <Student> students = jdbcTemplateObject.query(SQL,
new StudentMapper());
return students;
}
public void delete(Integer id){
String SQL = "delete from Student where id = ?";
jdbcTemplateObject.update(SQL, id);
System.out.println("Deleted Record with ID = " + id );
return;
}
public void update(Integer id, Integer age){
String SQL = "update Student set age = ? where id = ?";
jdbcTemplateObject.update(SQL, age, id);
System.out.println("Updated Record with ID = " + id );
return;
}
}
com.tutorialspoint.MainApp
package com.tutorialspoint;
import java.util.List;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MainApp {
public static void main(String[] args) {
//ApplicationContext context = new ClassPathXmlApplicationContext("Beans.xml");
//ApplicationContext context = new ClassPathXmlApplicationContext("/data/gateway/java/src/main/resources/beans.xml");
ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
StudentJDBCTemplate studentJDBCTemplate =
(StudentJDBCTemplate)context.getBean("studentJDBCTemplate");
System.out.println("------Records Creation--------" );
studentJDBCTemplate.create("Zara", 11);
studentJDBCTemplate.create("Nuha", 2);
studentJDBCTemplate.create("Ayan", 15);
System.out.println("------Listing Multiple Records--------" );
List<Student> students = studentJDBCTemplate.listStudents();
for (Student record : students) {
System.out.print("ID : " + record.getId() );
System.out.print(", Name : " + record.getName() );
System.out.println(", Age : " + record.getAge());
}
System.out.println("----Updating Record with ID = 2 -----" );
studentJDBCTemplate.update(2, 20);
System.out.println("----Listing Record with ID = 2 -----" );
Student student = studentJDBCTemplate.getStudent(2);
System.out.print("ID : " + student.getId() );
System.out.print(", Name : " + student.getName() );
System.out.println(", Age : " + student.getAge());
}
}
[root@d java]# java -jar /data/gateway/java/target/HelloSpringJDBCMysql-0.0.1-SNAPSHOT-jar-with-dependencies.jar
Dec 03, 2018 3:11:06 PM org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@133314b: startup date [Mon Dec 03 15:11:06 CST 2018]; root of context hierarchy
Dec 03, 2018 3:11:06 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [beans.xml]
------Records Creation--------
Created Record Name = Zara Age = 11
Created Record Name = Nuha Age = 2
Created Record Name = Ayan Age = 15
------Listing Multiple Records--------
ID : 1, Name : Zara, Age : 11
ID : 2, Name : Nuha, Age : 2
ID : 3, Name : Ayan, Age : 15
----Updating Record with ID = 2 -----
Updated Record with ID = 2
----Listing Record with ID = 2 -----
ID : 2, Name : Nuha, Age : 20
[root@d java]#
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