tcpclient.java

实例开发SOCKET客户／服务器程序,有详细的客户端/服务器端程序设计步骤.

import java.io.*;
import java.net.*;


public class tcpClient{
   public static void main (String args[])	{
       String server="";
       int port=0;
	// 提取命令行参数
       if (args.length != 2){
            System.out.println ("Invalid number of paramaters");
	    System.exit(1);
	}
	else{
	    server = args[0];
           if(server.trim()=="") server="localhost";
	    try {
		port = Integer.parseInt(args[1]);
	    }catch (Exception e) {
		System.out.println("server port = 1500 (default)");
		port = 1500;
	    }
        }

        try{
             System.out.println ("Connecting to " +server);

             // 与服务器建立连接
	     Socket tcpSocket = new Socket(server, port);

             //建立输入输出流
	     PrintStream out = new PrintStream( tcpSocket.getOutputStream()) ;
             DataInputStream in = new DataInputStream(tcpSocket.getInputStream());
             System.out.println(in.readLine());
             System.out.println("please enter your words:");

             //读取用户的输入
             DataInputStream userInput=new DataInputStream(System.in);
             String line =userInput.readLine();

            while (!line.trim().equals( "EXIT")){
                out.println(line.trim());
		System.out.println (in.readLine());
		//读取用户的下一个输入
                line = userInput.readLine();
             }
             out.println(line.trim());
             out.close();
             in.close();
             System.out.println("close the connection.");
            //关闭与服务器的连接
            tcpSocket.close();
	}catch (Exception e ){
            System.out.println (e);
	}
    }
}