使用jdbc连接服务器上的mysql出错，但是本地正常

Futureer 2013-11-01 11:25:29

用httpserver写的一个java程序，在本地测试的时候连接一切正常，在远程服务器上却连接出错。
.我是在本地导出一个可执行的.jar文件上传到服务器上，然后用命令行java -jar执行的。
.服务器和本地的数据库是用同一段SQL脚本创建的....
.帐号密码我在ssh上用mysql -u root -p是可以正常登录的。
.在ssh上使用mysql -variable查看默认端口还是3306
.本地使用java -jar运行正常
.connector的jar包已经包括进去了

额，有哪些可能的原因呢。。。求答疑。如下

public Connection getConnection(){

 String url = "jdbc:mysql://localhost:3306/bus";

		try {

			Class.forName("com.mysql.jdbc.Driver");

			String user = "root";

			String passWord = "****";

			conn = DriverManager.getConnection(url,user,passWord);

			if(conn!=null){

				System.out.println("连接数据库成功");

			}else{

				System.out.println("连接数据库失败");

			}

		} catch (ClassNotFoundException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		} catch (SQLException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		}

		return conn;

	}

异常如下：



The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

	at sun.reflect.GeneratedConstructorAccessor5.newInstance(Unknown Source)

	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

	at java.lang.reflect.Constructor.newInstance(Constructor.java:526)

	at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)

	at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1121)

	at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:357)

	at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2482)

	at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2519)

	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2304)

	at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:834)

	at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)

	at sun.reflect.GeneratedConstructorAccessor2.newInstance(Unknown Source)

	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

	at java.lang.reflect.Constructor.newInstance(Constructor.java:526)

	at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)

	at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:416)

	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:346)

	at java.sql.DriverManager.getConnection(DriverManager.java:571)

	at java.sql.DriverManager.getConnection(DriverManager.java:215)

	at Helper.MySql.getConnection(MySql.java:29)

	at Helper.MySql.<init>(MySql.java:17)

	at entrance.WHUTHandler.<init>(WHUTHandler.java:35)

	at jwc.JwcScoreHandler.<init>(JwcScoreHandler.java:34)

	at entrance.WHUT.main(WHUT.java:60)

	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

	at java.lang.reflect.Method.invoke(Method.java:606)

	at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:58)

Caused by: java.net.ConnectException: Connection refused

	at java.net.PlainSocketImpl.socketConnect(Native Method)

	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)

	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)

	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)

	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)

	at java.net.Socket.connect(Socket.java:579)

	at java.net.Socket.connect(Socket.java:528)

	at java.net.Socket.<init>(Socket.java:425)

	at java.net.Socket.<init>(Socket.java:241)

	at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:259)

	at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:307)

	... 23 more