一个tcp/ip套节字编程的javabean

package card_s;

import java.net.Socket;

import java.io.*;

public class card_s

{

Socket client;

BufferedReader socketReader;

String line = null;

PrintWriter socketWriter;

public String card_status(String userno)

{ try

{

//创建一个socket

client = new Socket("192.168.0.13",2002);

//创建输入输出数据流

socketReader = new BufferedReader(new InputStreamReader(client.getInputStream()));

socketWriter = new PrintWriter(client.getOutputStream());

//发送数据

socketWriter.println(userno);

socketWriter.flush();

//设置联接超时的时间

client.setSoTimeout(20000);

//接收数据

line=socketReader.readLine();

//关数据流

socketWriter.close();

socketReader.close();

client.close();

}

catch(Exception e)

{

line="系统忙，请稍后再试";

}

return(line);

}

}