MySql 数据库连接报错
安装后修改密码为：123456，用户名为：root。

连接数据库代码：

import java.sql.*;
public class ConnectionProvider{
  private String JDBC_DRIVER;
  private String DB_URL;
  private String DB_USER;
  private String DB_PASSWORD;

  public ConnectionProvider() {
  JDBC_DRIVER=PropertyReader.get("JDBC_DRIVER");
  DB_URL=PropertyReader.get("DB_URL");
  DB_USER=PropertyReader.get("DB_USER");
  DB_PASSWORD=PropertyReader.get("DB_PASSWORD");
  try{
  Class jdbcDriver=Class.forName(JDBC_DRIVER);
  java.sql.DriverManager.registerDriver((Driver)jdbcDriver.newInstance());
  }catch(Exception e){e.printStackTrace();}
  }

  public Connection getConnection()throws SQLException{
  Connection con=java.sql.DriverManager.getConnection(DB_URL,DB_USER,DB_PASSWORD);
  return con;
  }
}


import java.util.*;
import java.io.*;

public class PropertyReader {
  static private Properties ps;

  static{
  ps=new Properties();
  try{
  InputStream in=PropertyReader.class.getResourceAsStream("db.txt");
  ps.load(in);
  in.close();
  }catch(Exception e){e.printStackTrace();}
  }

  public static String get(String key){
  return (String)ps.get(key);
  }
}

db.txt 文件如下：
JDBC_DRIVER = com.mysql.jdbc.Driver
DB_URL = jdbc:mysql://localhost:3306/STOREDB?useUnicode=true&characterEncoding=GB2312
DB_USER = root
DB_PASSWORD =123456 



Exception in thread "main" java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:946)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2870)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:812)
at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3269)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1182)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2670)
at com.mysql.jdbc.Connection.<init>(Connection.java:1531)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at sql.ConnectionProvider.getConnection(ConnectionProvider.java:22)
at sql.DBTester2.addCustomer(DBTester2.java:13)
at sql.DBTester2.main(DBTester2.java:87)


------解决方案--------------------
Connection con=java.sql.DriverManager.getConnection(DB_URL,DB_USER,DB_PASSWORD);

断点调试中看一下 这三个变量的内容是什么。 特别是有无多余的空格。
------解决方案--------------------
用客户端试试是不是mysql的问题
------解决方案--------------------
字符集设置的问题。

http://blog.csdn.net/ACMAIN_CHM/archive/2009/05/12/4174186.aspx
MySQL 中文显示乱码