Java连接Sql Server2008

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

public class sqlserver
{
    public static void main(String args[])
    {         
        String urlserver = "jdbc:sqlserver://127.0.0.1:1433;databaseName=test;user=sa;password=sa123";//sqlserver身份连接        
        String urlwindows = "jdbc:sqlserver://127.0.0.1:1433;databaseName=test;integratedSecurity=true;";//windows集成模式连接    
    
        // 声明JDBC objects.    
        Connection con = null;    
        Statement stmt = null;    
        ResultSet rs = null;    
    
        try 
        {    
            // 建立连接    
            System.out.println("准备连接！！！");    
            Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");    
            con = DriverManager.getConnection(urlserver);    
            System.out.println("连接成功！！！");    
    
            // 写一个sql语句，并执行返回数据 
            String SQL = "SELECT * FROM a";    
            stmt = con.createStatement();    
            rs = stmt.executeQuery(SQL);    
    
            //将数据显示出来
            while (rs.next())
            {    
                System.out.println(rs.getString(2));    
            }    
        }    
        catch (Exception e) 
        {    
            e.printStackTrace();    
        }     
        finally 
        {    
            if (rs != null)    
                try 
                {    
                    rs.close();    
                }
                catch (Exception e)
                {    
                }    
            if (stmt != null)    
                try 
                {    
                    stmt.close();    
                }
                catch (Exception e) 
                {    
                }    
            if (con != null)    
                try
                {    
                    con.close();    
                } 
                catch (Exception e)
                {    
                }    
        }    
    }    
}