java socket 保持长连接 java socket tcp长连接

建立socke

 

public void server() {
　　　　  ServerSocket serverSocket = null;
        try {
            serverSocket = new ServerSocket(9898);  //端口号
            //通过死循环开启长连接，开启线程去处理消息
            System.out.println("服务启动...");
            while (true) {
                Socket socket = serverSocket.accept();//接受客户端的连接 （阻塞处理）
                new Thread(new MyRuns(socket)).start();//接收到客户端的消息，创建线程去处理
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (serverSocket != null) {
                    serverSocket.close();//记得关闭连接哦！
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
    }

public class MyRuns implements Runnable {

Socket socket;
        BufferedReader reader;
        BufferedWriter writer;
        public MyRuns(Socket socket) {
            super();
            this.socket = socket;
        }
        public void run() {
            Map<String, String> res = new HashMap<>();
            try {
                reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));//读取客户端消息
                writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));//向客户端写消息
                String mess = reader.readLine();
                System.out.println("接收的信息为:" + mess);
                if (mess != null && !"".equals(mess)) {
                    Map<String, Object> readValue = JSONObject.parseObject(mess, Map.class);
                    System.out.println(readValue.toString());
                    String XXX= readValue.get("XXX").toString();
                    res.put("res", true);
                }
            } catch (Exception e) {
                e.printStackTrace();
                res.put("res", String.valueOf(false));
                res.put("msg", e.toString());
            } finally {
                try {
                    System.out.println("运行结果：" + res);
                    writer.write(JSONObject.toJSONString(res));
                    writer.flush();
                    if (reader != null) {
                        reader.close();
                    }
                    if (writer != null) {
                        writer.close();
                    }
                    if (socket != null) {
                        socket.close();
                    }
                } catch (Exception e2) {
                    e2.printStackTrace();
                }
            }
        }
    }

 

进行连接测试

客户端（三种方式：自己写的客户端、NetAssist、SocketTest）

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