Socket Message Sender in JavaSE

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#socket #import #string #null #class #stream

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本文介绍了一个简单的Socket客户端程序，用于通过Socket连接发送消息。该程序使用Java编写，支持指定IP地址、端口及发送的消息内容。

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/*
 * SocketClient.java 
 * 09/22/2006
 */

package com.mot.lrt.network;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;

/**
 * class works as a message sender via socket connection, usage SocketMsgSender
 * <ip> <port> <msg>.
 * 
 * @author 
 * 
 */
public class SocketMsgSender {
    private static Socket socket;

    /**
     * @param args
     */
    public static void main(String[] args) {
        if (args == null || args.length < 3) {
            System.out.println("SocketMsgSender <ip> <port> <msg>");
            return;
        }
        String ip = args[0];
        int port = 0;
        try {
            port = Integer.parseInt(args[1]);
        } catch (NumberFormatException e) {
            // ignored
        }
        String msg = args[2];

        processSend(ip, port, msg);

    }

    private static void processSend(String ip, int port, String msg) {
        try {
            socket = new Socket(ip, port);

            OutputStream os = socket.getOutputStream();
            if (os == null) {
                // can not send message
                return;
            }
            InputStream is = socket.getInputStream();

            os.write(msg.getBytes());
            os.write("[over]/n".getBytes());
            os.flush();

            if (is != null) {
                BufferedReader br = new BufferedReader(
                        new InputStreamReader(is));
                String line = br.readLine();
                if (line != null) {
                    displayMsg(line);
                }
                is.close();
            }
            // close stream
            os.close();

        } catch (UnknownHostException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            try {
                socket.close();
            } catch (IOException e) {
                // ignored
            }
        }

    }

    /**
     * display the message to console
     * 
     * @param line
     */
    private static void displayMsg(String line) {
        System.out.println(line);
    }

}

//Socket Server in JavaSE