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 com.admin.db.opensql.getsqlconn(opensql.java:14)
    at com.admin.db.opensql.main(opensql.java:26)
Exception in thread "main" java.lang.NullPointerException
    at com.admin.db.opensql.main(opensql.java:28)
    
    
    
    
以下是我编写的：运行后就是上面的错误信息    
    
package com.admin.db;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class opensql {
    public Connection con;
    public Connection getsqlconn(String dburl, String dbuser, String dbpwsd){
        try{
            Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver").newInstance();
            con=DriverManager.getConnection(dburl,dbuser,dbpwsd);
        }catch(Exception e){
            e.printStackTrace();
        }
        return con;
    }
    public static void main(String[] args){
        opensql op = new opensql();
        String dburl = "jdbc:microsoft:sqlserver://192.168.1.222:1433;DatabaseName=master";
        String dbuser = "sa";
        String dbpwsd = "sa";
        String sql="select * from tuser";
        Connection con1 = op.getsqlconn(dburl,dbuser,dbpwsd);
        try{
            Statement st = con1.createStatement();
            ResultSet rs = st.executeQuery(sql);
            while(rs.next()){
                System.out.println("tid = "+rs.getInt(1)+"**"+"name = "+rs.getString(4));
                //System.out.println("tid = "+rs.getInt("tid")+"**"+"name = "+rs.getString("name"));
            }
        }catch(SQLException e){
            e.printStackTrace();
        }
        
    }
}