java.net.SocketException

eclipse中用JDBC连Mysql出现错误Socket is not connected
eclipse中用JDBC连Mysql出现错误Socket   is   not   connected


我在eclipse环境下建了一个Java   Project,写了一个类JdbcTest.java

然后在这个项目下导入了mysql连接包mysql-connector-java-3.1.12-bin.jar

然后运行这个类,出现了如下错误:

com.mysql.jdbc.CommunicationsException:   Communications   link   failure   due   to   underlying   exception:  

**   BEGIN   NESTED   EXCEPTION   **  

java.net.SocketException
MESSAGE:   java.net.SocketException:   Socket   is   not   connected:   connect

STACKTRACE:

java.net.SocketException:   java.net.SocketException:   Socket   is   not   connected:   connect
at   com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:156)
at   com.mysql.jdbc.MysqlIO. <init> (MysqlIO.java:284)
at   com.mysql.jdbc.Connection.createNewIO(Connection.java:2555)
at   com.mysql.jdbc.Connection. <init> (Connection.java:1485)
at   com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at   java.sql.DriverManager.getConnection(DriverManager.java:512)
at   java.sql.DriverManager.getConnection(DriverManager.java:171)
at   JdbcTest.go(JdbcTest.java:33)
at   JdbcTest.main(JdbcTest.java:46)


**   END   NESTED   EXCEPTION   **


Last   packet   sent   to   the   server   was   32   ms   ago.
at   com.mysql.jdbc.Connection.createNewIO(Connection.java:2621)
at   com.mysql.jdbc.Connection. <init> (Connection.java:1485)
at   com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at   java.sql.DriverManager.getConnection(DriverManager.java:512)
at   java.sql.DriverManager.getConnection(DriverManager.java:171)
at   JdbcTest.go(JdbcTest.java:33)
at   JdbcTest.main(JdbcTest.java:46)


我的类的源码如下:

import   com.mysql.jdbc.Driver;
import   java.sql.DriverManager;
import   java.sql.Connection;
import   java.sql.SQLException;
/**
  *   @author   tzq
  *
  */
public   class   JdbcTest   {

/**
  *   @param   args
  */
String   Driver   =   "com.mysql.jdbc.Driver ";
String   URL   =   "jdbc:mysql://localhost:3306/ ";
String   User   =   "root ";
String   password   =   " ";

public   void   go(){

try   {
Class.forName(Driver);
System.out.println( "Register   Successful!!! ");
}   catch   (ClassNotFoundException   e)   {
//   TODO   Auto-generated   catch   block
e.printStackTrace();
}

try   {
Connection   con   =   DriverManager.getConnection(URL,User,password);
System.out.println( "Connection   Successful!!! ");
}   catch   (SQLException   e)   {
//   TODO   Auto-generated   catch   block
e.printStackTrace();
}

}


public   static   void   main(String[]   args)   {
//   TODO   Auto-generated   method   stub
JdbcTest   jdbctest   =   new   JdbcTest();
jdbctest.go();
}

}

但是我在命令行模式下用javac,java,编译并运行没有错误,请问各位高手我的错误出在哪啊?

[解决办法]
String URL = "jdbc:mysql://localhost:3306/ ";
后面写上数据库的名字
String URL = "jdbc:mysql://localhost:3306/XXX ";