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主要实现需求

多线程收发并行
TCP多线程收发协作
TCP 服务端收发并行重构

TCP 服务端收发并行重构

启动main方法重构

原有的main逻辑如下：

重构后如下：

public class Server {public static void main(String[] args) throws IOException {TCPServer tcpServer = new TCPServer(TCPConstants.PORT_SERVER);boolean isSucceed = tcpServer.start();if(!isSucceed){System.out.println("Start TCP server failed.");}UDPProvider.start(TCPConstants.PORT_SERVER);// 键盘输入：BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));String str;do {str = bufferedReader.readLine();tcpServer.broadcast(str);} while (!"00bye00".equalsIgnoreCase(str));UDPProvider.stop();tcpServer.stop();}
}

重构后，从while循环不断读取键盘输入信息，当输入“00bye00” 时退出读取。此处只读取键盘输入数据，客户端发送的数据在会重新拆分出来新的线程单独处理。

重构分离收发消息的操作

创建 ClientHandler.java 重构收发消息操作：

public class ClientHandler {private final Socket socket;private final ClientReadHandler readHandler;private final ClientWriteHandler writeHandler;private final CloseNotiry closeNotiry;public ClientHandler(Socket socket, CloseNotiry closeNotiry ) throws IOException {this.socket = socket;this.readHandler = new ClientReadHandler(socket.getInputStream());this.writeHandler = new ClientWriteHandler(socket.getOutputStream());this.closeNotiry = closeNotiry;System.out.println("新客户链接： " + socket.getInetAddress() + "\tP:" + socket.getPort());} 
}

重构接收消息的操作

    /*** 接收数据*/class ClientReadHandler extends Thread {private boolean done = false;private final InputStream inputStream;ClientReadHandler(InputStream inputStream){this.inputStream = inputStream;}@Overridepublic void run(){super.run();try {// 得到输入流，用于接收数据BufferedReader socketInput = new BufferedReader(new InputStreamReader(inputStream));do {// 客户端拿到一条数据String str = socketInput.readLine();if(str == null){System.out.println("客户端已无法读取数据！");// 退出当前客户端ClientHandler.this.exitBySelf();break;}// 打印到屏幕System.out.println(str);}while (!done);socketInput.close();}catch (IOException e){if(!done){System.out.println("连接异常断开");ClientHandler.this.exitBySelf();}}finally {// 连接关闭CloseUtils.close(inputStream);}}void exit(){done = true;CloseUtils.close(inputStream);}}

创建一个单独的线程进行接收消息，该线程不需要关闭。

重构发送消息

    /*** 发送数据*/class ClientWriteHandler {private boolean done = false;private final PrintStream printStream;private final ExecutorService executorService;ClientWriteHandler(OutputStream outputStream) {this.printStream = new PrintStream(outputStream);// 发送消息使用线程池来实现this.executorService = Executors.newSingleThreadExecutor();}void exit(){done = true;CloseUtils.close(printStream);executorService.shutdown();}void send(String str) {executorService.execute(new WriteRunnable(str));}class WriteRunnable implements  Runnable{private final String msg;WriteRunnable(String msg){this.msg = msg;}@Overridepublic void run(){if(ClientWriteHandler.this.done){return;}try {ClientWriteHandler.this.printStream.println(msg);}catch (Exception e){e.printStackTrace();}}}}

TCPServer调用发送消息的逻辑

    public void broadcast(String str) {for (ClientHandler client : clientHandlerList){// 发送消息client.send(str);}}

监听客户端链接逻辑重构

    private List<ClientHandler> clientHandlerList = new ArrayList<>();/*** 监听客户端链接*/private class ClientListener extends Thread {private ServerSocket server;private boolean done = false;private ClientListener(int port) throws IOException {server = new ServerSocket(port);System.out.println("服务器信息： " + server.getInetAddress() + "\tP:" + server.getLocalPort());}@Overridepublic void run(){super.run();System.out.println("服务器准备就绪~");// 等待客户端连接do{// 得到客户端Socket client;try {client = server.accept();}catch (Exception e){continue;}try {// 客户端构建异步线程ClientHandler  clientHandler = new ClientHandler(client, handler -> clientHandlerList.remove(handler));// 启动线程clientHandler.readToPrint();clientHandlerList.add(clientHandler);} catch (IOException e) {e.printStackTrace();System.out.println("客户端连接异常： " + e.getMessage());}}while (!done);System.out.println("服务器已关闭！");}void exit(){done = true;try {server.close();}catch (IOException e){e.printStackTrace();}}}

clientHandlerList作为已经建立了连接的客户端的集合，用于管理当前用户的信息。接收与发送都使用该集合。

Socket、流的退出与关闭

    /*** 退出、关闭流*/public void exit(){readHandler.exit();writeHandler.exit();CloseUtils.close(socket);System.out.println("客户端已退出：" + socket.getInetAddress() + "\tP：" + socket.getPort());}/*** 发送消息* @param str*/public void send(String str){writeHandler.send(str);}/*** 接收消息*/public void readToPrint() {readHandler.exit();}/***  接收、发送消息异常，自动关闭*/private void exitBySelf() {exit();closeNotiry.onSelfClosed(this);}/***  关闭流*/public interface CloseNotiry{void onSelfClosed(ClientHandler handler);}

TCP 客户端收发并行重构

客户端 main函数重构

    public static void main(String[] args) {// 定义10秒的搜索时间，如果超过10秒未搜索到，就认为服务器端没有开机ServerInfo info = UDPSearcher.searchServer(10000);System.out.println("Server:" + info);if( info != null){try {TCPClient.linkWith(info);}catch (IOException e){e.printStackTrace();}}}

客户端接收消息重构

    static class ReadHandler extends Thread{private boolean done = false;private final InputStream inputStream;ReadHandler(InputStream inputStream){this.inputStream = inputStream;}@Overridepublic void run(){try {// 得到输入流，用于接收数据BufferedReader socketInput = new BufferedReader(new InputStreamReader(inputStream));do {// 客户端拿到一条数据String str = null;try {str = socketInput.readLine();}catch (SocketTimeoutException e){}if(str == null){System.out.println("连接已关闭，无法读取数据！");break;}// 打印到屏幕System.out.println(str);}while (!done);socketInput.close();}catch (IOException e){if(!done){System.out.println("连接异常断开：" + e.getMessage());}}finally {// 连接关闭CloseUtils.close(inputStream);}}void exit(){done = true;CloseUtils.close(inputStream);}}

创建ReadHandler用单独的线程去接收服务端的消息。连接关闭则exit() 关闭客户端。

客户端发送消息重构

    private static void write(Socket client) throws IOException {// 构建键盘输入流InputStream in = System.in;BufferedReader input = new BufferedReader(new InputStreamReader(in));// 得到Socket输出流，并转换为打印流OutputStream outputStream = client.getOutputStream();PrintStream socketPrintStream = new PrintStream(outputStream);boolean flag = true;do {// 键盘读取一行String str = input.readLine();// 发送到服务器socketPrintStream.println(str);// 从服务器读取一行if("00bye00".equalsIgnoreCase(str)){break;}}while(flag);// 资源释放socketPrintStream.close();}

在linkWith() 中调用write() 发送方法，由 do-while 循环读取本地键盘输入信息进行发送操作。当满足 “00bye00” 时，关闭循环，关闭socket连接，结束该线程。

客户端 linkWith 主方法重构

     public static void linkWith(ServerInfo info) throws IOException {Socket socket = new Socket();// 超时时间socket.setSoTimeout(3000);// 端口2000;超时时间300mssocket.connect(new InetSocketAddress(Inet4Address.getByName(info.getAddress()),info.getPort()));//System.out.println("已发起服务器连接，并进入后续流程~");System.out.println("客户端信息： " + socket.getLocalAddress() + "\tP:" + socket.getLocalPort());System.out.println("服务器信息：" + socket.getInetAddress() + "\tP:" + socket.getPort());try {ReadHandler readHandler = new ReadHandler(socket.getInputStream());readHandler.start();// 发送接收数据write(socket);}catch (Exception e){System.out.println("异常关闭");}// 释放资源socket.close();System.out.println("客户端已退出~");}

原有的逻辑里，是调用 todo() 方法，在todo() 方法里同时进行收发操作。现在是进行读写分离。

TCP 收发并行重构测试

服务端重构后执行日志

客户端重构后执行日志

源码下载

下载地址：https://gitee.com/qkongtao/socket_study/tree/master/src/main/java/cn/kt/socket/SocketDemo_L5_TCP_Channel