控制台报错

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控制台报错

来源：4-1 JDBC的工具类的抽取一

weixin_慕瓜9083905

2020-01-31 14:10:02

java.sql.SQLException: Access denied for user 'root@localhost'@'localhost' (using password: YES)

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1055)

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3515)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3447)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:911)

at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3953)

at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1276)

at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2048)

at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:723)

at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)

at java.lang.reflect.Constructor.newInstance(Unknown Source)

at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)

at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:302)

at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:282)

at java.sql.DriverManager.getConnection(Unknown Source)

at com.imooc.jdbc.utils.JDBCUtils.getConnection(JDBCUtils.java:41)

at com.imooc.jdbc.demo1.JDBCDemo3.demo1(JDBCDemo3.java:17)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)

at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)

at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)

at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)

at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)

at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)

at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)

at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)

at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)

at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)

at org.junit.runners.ParentRunner.run(ParentRunner.java:363)

at org.junit.runner.JUnitCore.run(JUnitCore.java:137)

at org.junit.runner.JUnitCore.run(JUnitCore.java:115)

at org.junit.vintage.engine.execution.RunnerExecutor.execute(RunnerExecutor.java:40)

at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(Unknown Source)

at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)

at java.util.Iterator.forEachRemaining(Unknown Source)

at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Unknown Source)

at java.util.stream.AbstractPipeline.copyInto(Unknown Source)

at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)

at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(Unknown Source)

at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(Unknown Source)

at java.util.stream.AbstractPipeline.evaluate(Unknown Source)

at java.util.stream.ReferencePipeline.forEach(Unknown Source)

at org.junit.vintage.engine.VintageTestEngine.executeAllChildren(VintageTestEngine.java:80)

at org.junit.vintage.engine.VintageTestEngine.execute(VintageTestEngine.java:71)

at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:229)

at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$6(DefaultLauncher.java:197)

at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:211)

at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:191)

at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:137)

at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:89)

at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:541)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:763)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:463)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209)

package com.imooc.jdbc.demo1;

import java.sql.Connection;

import java.sql.Statement;

import org.junit.Test;

import com.imooc.jdbc.utils.JDBCUtils;

public class JDBCDemo3 {

@Test

public void demo1() {

Connection conn = null;

Statement stmt = null;

try {

// 获得连接

conn = JDBCUtils.getConnection();

// 创建执行SQL语句的对象

stmt = conn.createStatement();

// 编写SQL:

String sql = "insert into user values (null,'fff','123','小无')";

//执行SQL:

int num = stmt.executeUpdate(sql);

if(num > 0) {

System.out.println("保存成功");

}

}catch(Exception e) {

e.printStackTrace();

}finally {

//释放资源

JDBCUtils.release(stmt, conn);

}

package com.imooc.jdbc.utils;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

/**

* JDBC工具类

* @author Administrator

public class JDBCUtils {

private static final String driverClass;

private static final String url;

private static final String username;

private static final String password;

static {

driverClass = "com.mysql.jdbc.Driver";

url = "jdbc:mysql:///jdbctest";

username = "root@localhost";

password = "12345";

}

/**

*注册驱动方法

* @throws ClassNotFoundException

public static void loadDriver() throws ClassNotFoundException {

Class.forName(driverClass);

}

/**

* 获得链接的方法

* @throws SQLException

public static Connection getConnection() throws Exception {

loadDriver();

Connection conn = DriverManager.getConnection(url,username, password);

return conn;

}

/**

* 资源的释放

public static void release(Statement stmt,Connection conn) {

if(stmt != null) {

try {

stmt.close();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}stmt = null;

if(conn != null) {

try {

conn.close();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}conn = null;

}

public static void release(ResultSet rs,Statement stmt,Connection conn) {

if(rs != null) {

try {

rs.close();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}rs = null;

if(stmt != null) {

try {

stmt.close();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}stmt = null;

if(conn != null) {

try {

conn.close();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}conn = null;

}

写回答

5回答

好帮手慕柯南

2020-02-02

同学你好！

你应该将mysql的jar换成8.0版本的，你可以在以下地址下载

https://repo1.maven.org/maven2/mysql/mysql-connector-java/8.0.19/

jdbc连接mysql8可参考教辅

如果我的回答解决了你的疑惑，请采纳，祝学习愉快~

weixin_慕瓜9083905

提问者

2020-02-02

我安装的mysql 是8.0.19 jar包是这个

好帮手慕柯南

2020-02-02

同学你好！

这个可能是mysql的jar包版本和本地数据库的版本不同造成的。问一下同学安装的mysql是几的版本，引入的jar是多少，建议同学检查一下，如果不同，请将jar包版本更换为和本地mysql相同的版本。

如果我的回答解决了你的疑惑，请采纳。祝：学习愉快~

weixin_慕瓜9083905

提问者

2020-02-01

已经把jdbc.properties的用户名改为root还是报错

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Client does not support authentication protocol requested by server; consider upgrading MySQL client

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)

at java.lang.reflect.Constructor.newInstance(Unknown Source)

at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)

at com.mysql.jdbc.Util.getInstance(Util.java:381)

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:984)

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3515)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3447)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:911)

at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3953)

at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1276)

at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2048)

at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:723)

at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)

at java.lang.reflect.Constructor.newInstance(Unknown Source)

at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)

at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:302)

at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:282)

at java.sql.DriverManager.getConnection(Unknown Source)

at com.imooc.jdbc.utils.JDBCUtils.getConnection(JDBCUtils.java:53)