远程mysql_java.sql.SQLException: null, message from server: "Host 'xxx' is not allowed to connect

1 /**
2          * 是这样的功能：我的机器是A，我现在先利用我自己写的一个jdbc方法<br>
3          * 调用远程的机器B上安装的数据库<br>
4          * 然后把我想要CRUD操作B机器上的数据库<br>
5          * 或者简单一点，可以这样认为，我现在在机器A上面有一些数据<br>
6          * 我要把这些数据插入到远程的机器B的mysql数据库里面去<br>
7          * 就是这样的操作<br>
8          */

  1 /**
  2  * 
  3  */
  4 package edu.gzucm.thms.utils;
  5 
  6 import java.sql.Connection;
  7 import java.sql.DriverManager;
  8 import java.sql.PreparedStatement;
  9 import java.sql.SQLException;
 10 import java.util.Calendar;
 11 
 12 /**
 13  * @author Hongten</br>
 14  * @date 2012-10-18
 15  * 
 16  */
 17 public class SendData {
 18 
 19     public static int sendDate2Server(String ip, String port,
 20             String databaseName, String userName, String passwrod,String receiver,String content) {
 21         int flag = 0;
 22         try {
 23             // 加载MySql的驱动类
 24             Class.forName("com.mysql.jdbc.Driver");
 25         } catch (ClassNotFoundException e) {
 26             System.out.println("找不到驱动程序类 ，加载驱动失败！");
 27             e.printStackTrace();
 28         }
 29         // 连接MySql数据库，用户名和密码都是root
 30         String url = "jdbc:mysql://"+ip+":"+port+"/"+databaseName;
 31         System.out.println(url);
 32         String username = "root";
 33         String password = "root";
 34         String sql = getSQL(receiver, content);
 35         Connection conn = null;
 36         PreparedStatement pstmt = null;
 37         try {
 38             conn = DriverManager.getConnection(url, username, password);
 39             pstmt = conn.prepareStatement(sql);
 40             flag = pstmt.executeUpdate(sql);
 41         } catch (SQLException se) {
 42             System.out.println("数据库连接失败！");
 43             se.printStackTrace();
 44         }
 45         if (pstmt != null) { // 关闭声明
 46             try {
 47                 pstmt.close();
 48             } catch (SQLException e) {
 49                 e.printStackTrace();
 50             }
 51         }
 52         if (conn != null) { // 关闭连接对象
 53             try {
 54                 conn.close();
 55             } catch (SQLException e) {
 56                 e.printStackTrace();
 57             }
 58         }
 59         return flag;
 60     }
 61     
 62     public static String getSQL(String receiver,String content){
 63         /**
 64          * 下面是一些常量设置： retrytimes=0 pri=1 inpool=0 sendmode=1
 65          * sendtime和inserttime的格式是：2011-05-03 18:55:20
 66          */
 67         String now = getNow();
 68         return "insert into sms_boxsending(sender,receiver,content,sendtime,inserttime,retrytimes,pri,inpool,sendmode)values(‘system‘,‘"+receiver+"‘,‘"+content+"‘,‘"+now+"‘,‘"+now+"‘,‘0‘,‘1‘,‘0‘,‘1‘)";
 69     }
 70     
 71     /**
 72      * 获取当前时间，并格式化时间
 73      * 
 74      * @return 格式化当前的时间
 75      */
 76     public static String getNow() {
 77         Calendar calendar = Calendar.getInstance();
 78         int year = calendar.get(Calendar.YEAR);
 79         int month = calendar.get(Calendar.MONTH);
 80         int day = calendar.get(Calendar.DAY_OF_MONTH);
 81         int hour = calendar.get(Calendar.HOUR_OF_DAY);
 82         int min = calendar.get(Calendar.MINUTE);
 83         int sec = calendar.get(Calendar.SECOND);
 84 
 85         Object monthString = (month < 10) ? "0" + month : month;
 86         Object dayString = (day < 10) ? "0" + day : day;
 87         Object hourString = (hour < 10) ? "0" + hour : hour;
 88         Object minString = (min < 10) ? "0" + min : min;
 89         Object secString = (sec < 10) ? "0" + sec : sec;
 90 
 91         return "" + year + "-" + monthString + "-" + dayString + " "
 92                 + hourString + ":" + minString + ":" + secString;
 93     }
 94     
 95     public static void main(String[] args) {
 96         //这里是调用远程机器B的mysql数据库
 97         System.out.println(sendDate2Server("210.38.111.34", "3306", "messagecat", null, null,"1342360****","this is a test 短信"));
 98         //这是测试本地的
 99         System.out.println(sendDate2Server("localhost", "3308", "messagecat", null, null,"1342360****","this is a test 短信"));
100     }
101 }

1 use mysql;
2 
3 show tables;

1 select host from user;
2 
3 update user set host =‘%‘ where user =‘root‘;