java实现Socket通信之单线程服务

import java.net.*;

import java.io.*;

public class echoserver {

   public static void main(string[] args) throws ioexception {

     if (args.length != 1 ) {

       system.out.println( "用法：echoserver <端口号>" );

       return ;

     }

     // 监听客户程序的连接请求

     serversocket listensocket = new serversocket(integer.parseint(args[ 0 ]));

     system.out.println( "服务程序正在监听端口" + args[ 0 ]);

     socket socket = listensocket.accept();

     // 从与客户程序的新建连接获取输入流和输出流

     printwriter out = new printwriter(socket.getoutputstream(), true );

     bufferedreader in = new bufferedreader( new inputstreamreader

       (socket.getinputstream()));

     // 从客户端读取数据，并写回数据的加工结果

     string message;

     while ((message = in.readline()) != null ) {

       system.out.println( "收到请求：" + message);

       out.println(message.touppercase());

     }

     // 关闭连接

     out.close();

     in.close();

     socket.close();

     listensocket.close();

   }

}

import java.net.*;

import java.io.*;

public class echoclient {

   public static void main(string[] args) throws exception {

     if (args.length != 2 ) {

       system.out.println( "用法：echoclient <主机名> <端口号>" );

       return ;

     }

     // 建立连接并打开相关联的输入流和输出流

     socket socket = new socket(args[ 0 ], integer.parseint(args[ 1 ]));

     system.out.println( "当前socket信息：" + socket);

     printwriter out = new printwriter(socket.getoutputstream(), true );

     bufferedreader in = new bufferedreader( new inputstreamreader

       (socket.getinputstream()));

     // 将控制台输入的字符串发送给服务端，并显示从服务端获取的处理结果

     bufferedreader stdin = new bufferedreader( new inputstreamreader

       (system.in));

     string userinput;

     while ((userinput = stdin.readline()) != null ) {

       out.println(userinput);

       system.out.println( "返回：" + in.readline());

     }

     stdin.close();

     // 关闭连接

     out.close();

     in.close();

     socket.close();

   }

}