socket通信-java

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服务端代码import java.io.BufferedReader;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.InputStreamReader;import java.net.ServerSocket;import java.net.Socket;public class TCPServer {    public static final int PORT = 12345;// 监听的端口号    public static void main(String[] args) {        System.out.println("服务器启动...\n");        TCPServer server = new TCPServer();        server.init();    }    public void init() {        try {            ServerSocket serverSocket = new ServerSocket(PORT);            while (true) {                // 一旦有堵塞, 则表示服务器与客户端获得了连接                Socket client = serverSocket.accept();                // 处理这次连接                new HandlerThread(client);            }        } catch (Exception e) {            System.out.println("服务器异常: " + e.getMessage());        }    }    private class HandlerThread implements Runnable {        private Socket socket;        public HandlerThread(Socket client) {            socket = client;            new Thread(this).start();        }        public void run() {            try {                // 读取客户端数据                DataInputStream input = new DataInputStream(                        socket.getInputStream());                String clientInputStr = input.readUTF();// 这里要注意和客户端输出流的写方法对应,否则会抛                                                        // EOFException                // 处理客户端数据                System.out.println("服务端收到:" + clientInputStr);                // 向客户端回复信息                DataOutputStream out = new DataOutputStream(                        socket.getOutputStream());                System.out.println("服务端输入:");                // 发送键盘输入的一行                String s = new BufferedReader(new InputStreamReader(System.in))                        .readLine();                out.writeUTF(s);                out.close();                input.close();            } catch (Exception e) {                System.out.println("服务器 run 异常: " + e.getMessage());            } finally {                if (socket != null) {                    try {                        socket.close();                    } catch (Exception e) {                        socket = null;                        System.out.println("服务端 finally 异常:" + e.getMessage());                    }                }            }        }    }}客户端代码import java.io.BufferedReader;  import java.io.DataInputStream;  import java.io.DataOutputStream;  import java.io.IOException;  import java.io.InputStreamReader;  import java.net.Socket;  public class TCPClient {      public static final String IP_ADDR = "localhost";//服务器地址       public static final int PORT = 12345;//服务器端口号        public static void main(String[] args) {            System.out.println("客户端启动...");            System.out.println("当接收到服务器端字符为 \"OK\" 的时候, 客户端将终止\n");           while (true) {                Socket socket = null;              try {                  //创建一个流套接字并将其连接到指定主机上的指定端口号                  socket = new Socket(IP_ADDR, PORT);                    //读取服务器端数据                    DataInputStream input = new DataInputStream(socket.getInputStream());                    //向服务器端发送数据                    DataOutputStream out = new DataOutputStream(socket.getOutputStream());                    System.out.println("客户端输入: ");                    String str = new BufferedReader(new InputStreamReader(System.in)).readLine();                    out.writeUTF(str);                    String ret = input.readUTF();                     System.out.println("客户端接收: " + ret);                    // 如接收到 "OK" 则断开连接                    if ("OK".equals(ret)) {                        System.out.println("客户端将关闭连接");                        Thread.sleep(500);                        break;                    }                    out.close();                  input.close();              } catch (Exception e) {                  System.out.println("客户端异常:" + e.getMessage());               } finally {                  if (socket != null) {                      try {                          socket.close();                      } catch (IOException e) {                          socket = null;                           System.out.println("客户端 finally 异常:" + e.getMessage());                       }                  }              }          }        }    }
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