Question

我正在尝试使用JDBC和MySQL驱动程序连接到数据库 Struts2使用Eclipse IDE，但由于访问被拒绝，我收到错误，任何人都可以帮助我吗？提前致谢

pom.xml是

<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>testdatabase</groupId>
<artifactId>testdb</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<dependencies>
<dependency>
    <groupId>org.apache.struts</groupId>
    <artifactId>struts2-core</artifactId>
    <version>2.3.24</version>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.36</version>
</dependency>
</dependencies>
</project>

动作类是

public String execute()
{
    Connection con=null;
     String URL = "jdbc:mysql://localhost/hadoopinfo";
     String ret = ERROR;
     try
     {
         Class.forName("com.mysql.jdbc.Driver");
        System.out.println("Driver loaded!");

     }
     catch(Exception e)
     {
         e.printStackTrace();
     }
     try {
         con = DriverManager.getConnection(URL, "root", "root123");
         System.out.println("Connected to DataBase");
        }
        catch(Exception e)
        {
            System.out.println("seems problem with either URL or  
       User and Password ");
            e.printStackTrace();
        }

错误是

  Driver loaded!
  seems problem with either URL or User and Password 
  java.sql.SQLException: Access denied for user 'root'@'localhost' (using     
  password: YES)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:998)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3847)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3783)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:871)
at`com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication
    (MysqlIO.java:`1665)  




at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1207)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2249)
at  
 `com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2280)`
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2079)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:794)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:44)
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:400)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:399)
at 
  com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:325)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)

Answer 1

假设您可以通过命令提示符（在应用程序之外）进行连接

在sql编辑器中运行此查询，并检查结果

SELECT * FROM mysql.user

查看您是否有作为主持人localhost和用户root，

的条目

如果不是：创建一个

如果是：您的密码错误。

您使用%作为主机连接到Mysql。更改主机localhost

的密码

注意：要重置root密码，请点击此链接https://dev.mysql.com/doc/refman/5.7/en/resetting-permissions.html

使用Struts2和jdbc无法连接到MySQL数据库

1 个答案: