messageclient.java

java 通讯程序

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

public class MessageClient {

	public static void main(String[] args) {
		String addr=null,message=null;
		int port=0;
		if(args.length==3){
			addr=args[0];
			try{
				port=Integer.parseInt(args[1]);
			}catch(Exception e){
				System.out.println("参数错误：断口号必须是1024~65535之间的整数");
				System.out.println("用法：java MessageClient <地址> <端口号> <消息>");
				System.exit(-1);
			}
			message=args[2];
		}
		else{
			System.out.println("用法：java MessageClient <地址> <端口号> <消息>");
			System.exit(-1);
		}
		
		InetAddress serverAddr=null;
		Socket client=null;
		try {
			serverAddr=InetAddress.getByName(addr);
		} catch (UnknownHostException e) {
			System.out.println("地址错误：服务器地址错误");
			System.out.println("用法：java MessageClient <地址> <端口号> <消息>");
			System.exit(-1);
		}
		try {
			client=new Socket(serverAddr,port);
			DataInputStream dis=new DataInputStream(client.getInputStream());
			DataOutputStream dos=new DataOutputStream(client.getOutputStream());
			dos.writeUTF(message);
			String answer=dis.readUTF();
			System.out.println("服务器响应: "+answer);
		} catch (IOException e) {
			System.out.println("通信错误：在与服务器通信过程中发生错误");
			System.exit(-1);
		} finally{
			try {
				client.close();
			} catch (IOException e) {}
		}
	}

}