while opening read connection: jdbc:mysql message from server: Host is not allowed to connect to t

深藏阁楼爱情的钟 2023-10-17 16:16 27阅读 0赞

## [远程mysql\_java.sql.SQLException: null, message from server: "Host 'xxx' is not allowed to connect][mysql_java.sql.SQLException_ null_ message from server_ _Host _xxx_ is not allowed to connect] ##

最近在做一个项目，里面要用到远程mysql数据库。

我想把我想要实现的功能说一下吧：

![复制代码][copycode.gif]

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 
 3 * 调用远程的机器B上安装的数据库 
 4 * 然后把我想要CRUD操作B机器上的数据库 
 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 
 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 
 7 * 就是这样的操作 
 8 */

![复制代码][copycode.gif]

效果图如下：

![r_mysql.png][]

下面是我在机器A上面写的测试类：

![复制代码][copycode.gif]

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
 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 }

![复制代码][copycode.gif]

结果是这样的：

![r_mysqlexception.png][]

那我们应该怎样解决这个问题呢？

我也是查了一下资料，才把这个问题给搞定的。。。。

其实道理很简单，也就是说，远程的机器B不允许机器A访问他的数据库。也就是说，我们要解决这个问题，就是要让机器B的数据库允许

机器A访问，就搞定啦；

操作步骤也是很简单的：

一：打开mysql控制台，输入：

1 use mysql;
    2 
    3 show tables;

![r_mysql_user.jpg][]

二：输入：

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

![r_mysql_host.jpg][]

三：进入计算机的服务界面，重新启动mysql服务就搞定啦。。

![r_mysql_restart.jpg][]

四：下面是运行效果图：

![r_mysql_result.jpg][]

返回值都为1，说明，程序运行正常....同时也祝你好运....

还有跟多方法：[http://hi.baidu.com/soutnila/item/5356f2c0002781bf0d0a7bae][http_hi.baidu.com_soutnila_item_5356f2c0002781bf0d0a7bae]

来源:http://www.cnblogs.com/hongten/archive/2012/10/25/mysql.html

[mysql_java.sql.SQLException_ null_ message from server_ _Host _xxx_ is not allowed to connect]: http://www.cnblogs.com/hongten/archive/2012/10/25/mysql.html
[copycode.gif]: http://common.cnblogs.com/images/copycode.gif
[r_mysql.png]: http://images.cnblogs.com/cnblogs_com/hongten/356471/r_mysql.png
[r_mysqlexception.png]: http://images.cnblogs.com/cnblogs_com/hongten/356471/r_mysqlexception.png
[r_mysql_user.jpg]: http://images.cnblogs.com/cnblogs_com/hongten/356471/r_mysql_user.jpg
[r_mysql_host.jpg]: http://images.cnblogs.com/cnblogs_com/hongten/356471/r_mysql_host.jpg
[r_mysql_restart.jpg]: http://images.cnblogs.com/cnblogs_com/hongten/356471/r_mysql_restart.jpg
[r_mysql_result.jpg]: http://images.cnblogs.com/cnblogs_com/hongten/356471/r_mysql_result.jpg
[http_hi.baidu.com_soutnila_item_5356f2c0002781bf0d0a7bae]: http://hi.baidu.com/soutnila/item/5356f2c0002781bf0d0a7bae

while opening read connection: jdbc:mysql message from server: Host is not allowed to connect to t

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