Java Socket实现C/S实例 (包括使用NIO)
2011-05-10 17:28
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一般的Server端
使用NIO的Server端 (从1.5开始,Java对InputStream/OutputStream 进行了重新改写,用的就是NIO,因此,就算你不显示声明要用NIO,只要你的类继承了InputStream/OutputStream就已经在用NIO了)
Client端
package thread.socket; import java.io.*; import java.net.*; import java.util.*; public class Server extends ServerSocket { private static final int SERVER_PORT = 10000; private List<WorkerThread> workers; public Server() throws IOException { super(SERVER_PORT); workers = new LinkedList<WorkerThread>(); try { System.out.println("server is listening..."); while (true) { Socket socket = accept(); workers.add(new WorkerThread(socket)); System.out.println(String.format("new worker created, total %d", getWorkerCount())); } } catch (IOException e) { } finally { close(); } } public synchronized int getWorkerCount() { return workers.size(); } public static void main(String[] args) throws IOException { new Server(); } } // --- WorkerThread class WorkerThread extends Thread { private Socket client; private BufferedReader in; private PrintWriter out; public WorkerThread(Socket s) throws IOException { System.out.println(String.format("create a new thread. %s", s)); client = s; in = new BufferedReader(new InputStreamReader(client .getInputStream(), "GB2312")); out = new PrintWriter(client.getOutputStream(), true); out.println("--- Welcome ---" + client.getRemoteSocketAddress()); start(); } public void run() { try { String line = in.readLine(); while (!line.equals("bye")) { System.out.println("client " + client.getRemoteSocketAddress() + " says: " + line); String msg = createMessage(line); out.println(msg); line = in.readLine(); } out.println("bye"); System.out.println("client " + client.getRemoteSocketAddress() + " quit"); client.close(); } catch (IOException e) { } } private String createMessage(String line) { // ; return "response to " + line; } }
使用NIO的Server端 (从1.5开始,Java对InputStream/OutputStream 进行了重新改写,用的就是NIO,因此,就算你不显示声明要用NIO,只要你的类继承了InputStream/OutputStream就已经在用NIO了)
import java.io.BufferedWriter; import java.io.FileInputStream; import java.io.IOException; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.net.InetSocketAddress; import java.net.ServerSocket; import java.nio.ByteBuffer; import java.nio.CharBuffer; import java.nio.channels.FileChannel; import java.nio.channels.SelectionKey; import java.nio.channels.Selector; import java.nio.channels.ServerSocketChannel; import java.nio.channels.SocketChannel; import java.nio.charset.Charset; import java.nio.charset.CharsetDecoder; import java.util.Iterator; import java.util.LinkedList; import java.util.Set; public class SelectorServer { private static int DEFAULT_SERVERPORT = 6018;//默认端口 private static int DEFAULT_BUFFERSIZE = 1024;//默认缓冲区大小为1024字节 private static String DEFAULT_CHARSET = "GB2312";//默认码集 private static String DEFAULT_FILENAME = "bigfile.dat"; private ServerSocketChannel channel; private LinkedList<SocketChannel> clients; private Selector selector;//选择器 private ByteBuffer buffer;//字节缓冲区 private int port; private Charset charset;//字符集 private CharsetDecoder decoder;//解码器 public SelectorServer(int port) throws IOException { this.port = port; this.clients = new LinkedList<SocketChannel>(); this.channel = null; this.selector = Selector.open();//打开选择器 this.buffer = ByteBuffer.allocate(DEFAULT_BUFFERSIZE); this.charset = Charset.forName(DEFAULT_CHARSET); this.decoder = this.charset.newDecoder(); } private class HandleClient { private String strGreeting = "welcome to VistaQQ"; public HandleClient() throws IOException { } public String readBlock() {//读块数据 return this.strGreeting; } public void close() { } } protected void handleKey(SelectionKey key) throws IOException {//处理事件 if (key.isAcceptable()) { // 接收请求 ServerSocketChannel server = (ServerSocketChannel) key.channel();//取出对应的服务器通道 SocketChannel channel = server.accept(); channel.configureBlocking(false); channel.register(selector, SelectionKey.OP_READ);//客户socket通道注册读操作 } else if (key.isReadable()) { // 读信息 SocketChannel channel = (SocketChannel) key.channel(); int count = channel.read(this.buffer); if (count > 0) { this.buffer.flip(); CharBuffer charBuffer = decoder.decode(this.buffer); System.out.println("Client >>" + charBuffer.toString()); SelectionKey wKey = channel.register(selector, SelectionKey.OP_WRITE);//为客户sockt通道注册写操作 wKey.attach(new HandleClient()); } else {//客户已经断开 channel.close(); } this.buffer.clear();//清空缓冲区 } else if (key.isWritable()) { // 写事件 SocketChannel channel = (SocketChannel) key.channel(); HandleClient handle = (HandleClient) key.attachment();//取出处理者 ByteBuffer block = ByteBuffer.wrap(handle.readBlock().getBytes()); channel.write(block); // channel.socket().getInputStream().(block); // PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter( // channel.socket().getOutputStream())), true); // out.write(block.toString()); } } public void listen() throws IOException { //服务器开始监听端口,提供服务 ServerSocket socket; channel = ServerSocketChannel.open(); // 打开通道 socket = channel.socket(); //得到与通到相关的socket对象 socket.bind(new InetSocketAddress(port)); //将scoket榜定在制定的端口上 //配置通到使用非阻塞模式,在非阻塞模式下,可以编写多道程序同时避免使用复杂的多线程 channel.configureBlocking(false); channel.register(selector, SelectionKey.OP_ACCEPT); try { while(true) {// 与通常的程序不同,这里使用channel.accpet()接受客户端连接请求,而不是在socket对象上调用accept(),这里在调用accept()方法时如果通道配置为非阻塞模式,那么accept()方法立即返回null,并不阻塞 this.selector.select(); Iterator iter = this.selector.selectedKeys().iterator(); while(iter.hasNext()) { SelectionKey key = (SelectionKey)iter.next(); iter.remove(); this.handleKey(key); } } } catch(IOException ex) { ex.printStackTrace(); } } public static void main(String[] args) throws IOException { System.out.println("服务器启动"); SelectorServer server = new SelectorServer(SelectorServer.DEFAULT_SERVERPORT); server.listen(); //服务器开始监听端口,提供服务 } }
Client端
package thread.socket; import java.io.*; import java.net.*; public class Client { Socket socket; BufferedReader in; PrintWriter out; public Client() { try { socket = new Socket("127.0.0.1", 10000); in = new BufferedReader(new InputStreamReader(socket .getInputStream())); out = new PrintWriter(socket.getOutputStream(), true); BufferedReader line = new BufferedReader(new InputStreamReader( System.in)); String cmd = ""; while (!cmd.equals("bye")) { System.out.println("server says: " + in.readLine()); out.println(cmd = line.readLine()); } System.out.println("socket " + socket + " stop"); line.close(); out.close(); in.close(); socket.close(); } catch (IOException e) { } } public static void main(String[] args) { new Client(); } }
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