java jdbc 链接本地mysql数据库 报错 Access denied for user 'root'@'localhost' (using password: YES)

1.-------------- 问题描述 ----------------------------

java jdbc 链接本地 mysql 数据库 报错  Access denied for user 'root'@'localhost' (using password: YES)

 

2. ------------ 解决过程 ---------------------------------------

01. 最开始是因为 jdbc 驱动包导进来,倒入驱动包

02. 导入之后,报错

Access denied for user 'root'@'localhost' (using password: YES)

 就感觉很奇怪了,因为命令窗口里用户名和密码是可以等进去的,然后网上搜了一下

说:用户权限不够,环境变量配置,jar 包都可能导致这个错误。。。

3. 代码肯定是没有错的

package my01;
import java.sql.*;
public class jdbctest {
    public static void main(String args[]) {
        String pwd = "123456";
        try {
          Class.forName("com.mysql.jdbc.Driver");     //加载 MYSQL JDBC 驱动程序   
          //Class.forName("org.gjt.mm.mysql.Driver");
         System.out.println("Success loading Mysql Driver!");}
        catch (Exception e) {
          System.out.print("Error loading Mysql Driver!");
          e.printStackTrace();}
        try {
          Connection connect = DriverManager.getConnection(
                  "jdbc:mysql://localhost:3306/test","root",pwd);
               //连接 URL 为   jdbc:mysql//服务器地址 / 数据库名  ,后面的 2 个参数分别是登陆用户名和密码
         
      System.</span><span style="color: rgba(0, 0, 255, 1)">out</span>.println(<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">Success connect Mysql server!</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
      Statement stmt </span>=<span style="color: rgba(0, 0, 0, 1)"> connect.createStatement();
      ResultSet rs </span>= stmt.executeQuery(<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">select * from user</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
                                                              </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">user 为你表的名称</span>
<span style="color: rgba(0, 0, 255, 1)">while</span><span style="color: rgba(0, 0, 0, 1)"> (rs.next()) {
        System.</span><span style="color: rgba(0, 0, 255, 1)">out</span>.println(rs.getString(<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">name</span><span style="color: rgba(128, 0, 0, 1)">"</span>)+rs.getString(<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">password</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">));
      }
    }
    </span><span style="color: rgba(0, 0, 255, 1)">catch</span><span style="color: rgba(0, 0, 0, 1)"> (Exception e) {
      System.</span><span style="color: rgba(0, 0, 255, 1)">out</span>.print(<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">get data error!</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
      e.printStackTrace();
    }
  }

}

----------------- 那么原因究竟在哪里? ---------------------

4. 我想了一下,用户名,密码肯定没错,jar 包 也 buildPath 进来了,会不会是我的 mysql 服务没有开起来???

------------------- 问题就这样解决了 -----------------

5. ----------------- 如果文章对您有所帮助,欢迎打赏 --------------