JDBC的错误(抱SQL异常`)

相同的代码`我在学校的电脑上可以正常执行``可是回家电脑报以下错误呀`相同的数据库和相同的JDBC包``
而且已经把数据库用户名都改为相同了```````java.sql.SQLException: [Microsoft][SQLServer 2000 Driver for JDBC]Error establishing socket.
at com.microsoft.jdbc.base.BaseExceptions.createException(Unknown Source)
at com.microsoft.jdbc.base.BaseExceptions.getException(Unknown Source)
at com.microsoft.jdbc.base.BaseExceptions.getException(Unknown Source)
at com.microsoft.jdbc.sqlserver.tds.TDSConnection.<init>(Unknown Source)
at com.microsoft.jdbc.sqlserver.SQLServerImplConnection.open(Unknown Source)
at com.microsoft.jdbc.base.BaseConnection.getNewImplConnection(Unknown Source)
at com.microsoft.jdbc.base.BaseConnection.open(Unknown Source)
at com.microsoft.jdbc.base.BaseDriver.connect(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at less08.NewJFrame.inittree(NewJFrame.java:319)
at less08.NewJFrame.<init>(NewJFrame.java:105)
at less08.NewJFrame$1.run(NewJFrame.java:93)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
原代码在这里
public class Test 
{
public static void main(String[] args) throws Exception
{
//加驱动
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
//建连接
Connection conn=DriverManager.getConnection("jdbc:Microsoft:sqlserver://localhost:1433;databasename=pubs","sa","sa");
//发送命令
Statement sm=conn.createStatement();
ResultSet rs=sm.executeQuery("select * from jobs");
while(rs.next())
{
int job_id=rs.getInt(1);
String job_desc=rs.getString(2);
int job_min=rs.getInt(3);
int job_max=rs.getInt(4);
System.out.println("job_id:"+job_id+"job_desc:"+job_desc+"job_min:"+job_min+"job_max:"+job_max);
}
//关闭 0
rs.close();
sm.close();
conn.close();
}}