java : chat 客户端

Client.java

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

public class Client {
	private String host;
	private int port;

	// 构造方法
	public Client(String host,int port){
		this.host=host;
		this.port=port;
	}
	// 连接方法
	public String connect(String msg){
		if (msg == null) return null;
		StringBuffer sb = new StringBuffer(100);
		try {
			Socket socket = new java.net.Socket(host,port);
        	PrintWriter writer = new java.io.PrintWriter(socket.getOutputStream(),true);
        	writer.println(msg);
        	try {
            	Scanner ins = new java.util.Scanner(socket.getInputStream());
            	while( ins.hasNextLine()){
                	sb.append(ins.nextLine());
            	}
        	} finally {
            	socket.close();
        	}
    	} catch(IOException e){
        	return e.toString();
    	}
    	return sb.toString();
    }
    // Test
    public static void main(String[] args){
    	String msg =null;
    	if (args.length ==1){
    		msg = args[0];
    	} else {
    		System.out.println(" usage: java Clinet message ");
    		System.exit(1);
		}
		String host ="127.0.0.1";
		int port = 12345;
		Client client = new Client(host,port);
		String str = client.connect(msg);
		System.out.println(str);
	}	
			
}

运行 java Client message