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JAVA SQLSERVER Á¬½Ó

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com.microsoft.sqlserver.jdbc.SQLServerException: µ½Ö÷»ú  µÄ TCP/IP Á¬½Óʧ°Ü¡£ java.net.ConnectException: Connection refused: connect

´ó¼Ò°ïæ¿´¿´´úÂëÄÄÀï´íÁË
package cn.ctgu.edu.ac;
import java.sql.*;

public class connect {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
String url="jdbc:sqlserver://localhost:1433;Database=ÍøÉÏÊéµê¹ÜÀíϵͳ;integratedSecurity=true;"; //ÓÃwidowsÉí·ÝµÇ¼
String sql="select * users";
Connection conn=null;
try
{
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
conn=DriverManager.getConnection(url);
Statement SQLStatement=conn.createStatement();
ResultSet rt=SQLStatement.executeQuery(sql);
while(rt.next())
{
System.out.println(rt.getInt("userID")+""+rt.getString("username"));
}
if(rt!=null)
{
rt.close();
}
if(SQLStatement!=null)
{
SQLStatement.close();
}
}
catch(Exception e)
{
e.printStackTrace();
}

}
}

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