Java基于Socket的简单推送

做过安卓的肯定大多使用过推送，其实我们也可以通过socket做一个简单的推送平台，如果想考虑高并发的情况可以采用mina或者netty等开源框架（如果有时间我会把关于minasocket的文章补上来）。这里就先用Java原生的socket简单实现以下。其实推送的原理也无非就是轮询和长链接，这里是服务端与客服端要建立一个长连接，建立连接后客户端要不停的去监听来自服务端的消息。

再贴代码之前我先稍微说一下基于socket的简单推送的过程。

首先：开启服务端，并暴露出端口。然后通过一个while的死循环去不停的接收来自客户端的socket，并且通过一个ArrayList来维护。并且通过子线程去对list中的socket进行操作。

其次：客户端去访问服务器的端口。开启一个子线程去不停的接收来自服务端的消息。

服务端代码：

package com.push.mypush;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.net.ServerSocket;import java.net.Socket;import java.util.ArrayList;public class MyPushServer {ArrayList<Socket> sockets = new ArrayList<Socket>();public static void main(String[] args) {MyPushServer myPushServer = new MyPushServer();try {myPushServer.start();} catch (IOException e) {e.printStackTrace();}}public void start() throws IOException {ServerSocket serverSocket = new ServerSocket(4000);System.out.println("服务启动成功");while (true) {Socket socket = serverSocket.accept();System.out.println("server started... http:/"+socket.getLocalAddress()+":"+socket.getPort());System.out.println(socket.getLocalSocketAddress()+":"+socket.getLocalPort());sockets.add(socket);synchronized (ServerSocket.class) {ServerThread serverThread = new ServerThread();serverThread.start();}}}class ServerThread extends Thread{private BufferedReader reader;private BufferedWriter writer;private BufferedReader read;public ServerThread() {reader = new BufferedReader(new InputStreamReader(System.in));}@Overridepublic void run() {String content = null;String getContent = null;while (true) {try {if ((content = reader.readLine())!=null) {for (Socket socket : sockets) {writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));writer.write(content);writer.newLine();writer.flush();System.out.println("write");read = new BufferedReader(new InputStreamReader(socket.getInputStream()));if ((getContent = read.readLine()) != null) {System.out.println(getContent);}}}} catch (Exception e) {e.getStackTrace();}}}}}

客户端代码：

import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.net.Socket;public class MyPushClient{private Socket socket;public static void main(String[] args){MyPushClient myPushClient = new MyPushClient();try{myPushClient.start();} catch (Exception e){e.printStackTrace();}}public void  start() throws Exception{socket = new Socket("127.0.0.1",4000);System.out.println("server connection..");ClientThread clientThread = new ClientThread();clientThread.start();}class ClientThread extends Thread{private BufferedReader reader;private BufferedWriter writer;public ClientThread(){try{reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));} catch (IOException e){// TODO Auto-generated catch blocke.printStackTrace();}}@Overridepublic void run(){String content = null;while (true){try{if ((content = reader.readLine()) != null){System.out.println(content);writer.write("收到消息");writer.newLine();writer.flush();}} catch (IOException e){// TODO Auto-generated catch blocke.printStackTrace();}}}}}