java web工程启动socket服务

1、新建web工程

2、自定义类 实现ServletContextListener 接口

在contextInitialized方法中启动socket服务的线程

在contextDestroyed方法中关闭socket线程的服务，释放监听端口

3、更改web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_IDsocket Server</display-name>

  <context-param>

    <param-name>socketPort</param-name>

    <param-value>8888</param-value>

  </context-param>

  <listener>

    <description>Socket</description>

    <listener-class>myserver.ServerSocketListener</listener-class>

  </listener>

  <welcome-file-list>

    <welcome-file>index.html</welcome-file>

    <welcome-file>index.htm</welcome-file>

    <welcome-file>index.jsp</welcome-file>

    <welcome-file>default.html</welcome-file>

    <welcome-file>default.htm</welcome-file>

    <welcome-file>default.jsp</welcome-file>

  </welcome-file-list>

</web-app>

4、tomcat发布服务即可

 

注：需进入servlet-api.jar包

附示例代码

public class ServerSocketListener implements ServletContextListener

{

    private SocketThread socketThread;



    public void contextDestroyed(ServletContextEvent e)

    {

        if (socketThread != null && socketThread.isInterrupted())

        {

            socketThread.closeServerSocket();

            socketThread.interrupt();

        }

    }



    public void contextInitialized(ServletContextEvent e)

    {

        ServletContext servletContext = e.getServletContext();

        System.out.println("Server contextInitialized over");

        if (socketThread == null)

        {

            socketThread = new SocketThread(null, servletContext);

            socketThread.start(); 

        }

    }

}

class SocketThread extends Thread

{

    Integer count = 0;

    private ServletContext servletContext;

    private ServerSocket serverSocket;



    public SocketThread(ServerSocket serverSocket, ServletContext servletContext)

    {

        this.servletContext = servletContext;

        // 从web.xml中context-param节点获取socket端口

        String port = this.servletContext.getInitParameter("socketPort");

        if (serverSocket == null)

        {

            try

            {

                this.serverSocket = new ServerSocket(Integer.parseInt(port));

            }

            catch (IOException e)

            {

                e.printStackTrace();

            }

        }

    }

    public void run()

    {

        try

        {

            Integer count = 0;

            while (!this.isInterrupted())

            {

                MyServer.rerfresh();

                

                Socket socket = serverSocket.accept();

                count++;

                System.out.println("Server SocketThread start:"+count);

                if (socket != null)

                {

                    SocketClientBean client = new SocketClientBean();

                    client.setSocket(socket);

                    MyServer.clientlist.add(client);



                    System.out.println("new commer:"+socket.getRemoteSocketAddress().toString());

                    MyServer.invoke(socket);

                }

            }

        }

        catch (Exception ex)

        {

            System.out.println("SocketThread err:"+ex.getMessage());

        }

    }

    

    public void closeServerSocket()

    {

        try

        {

            if (serverSocket != null && !serverSocket.isClosed())

            {

                serverSocket.close();

                MyServer.destroyedTimer();

            }



        }

        catch (Exception ex)

        {

            System.out.println("SocketThread err:"+ex.getMessage());

        }

    }

}

public class MyServer

{

    public static List<SocketClientBean> clientlist = new ArrayList<SocketClientBean>();private static Timer timer = new Timer();



    public static void rerfresh()

    {

        timer.schedule(new MyClientRefreshTask(), 1000*0, 1000*15);

    }

    public static void destroyedTimer()

    {

        if(timer1!=null)

        {

            timer1.cancel();

        }

        if(timer!=null)

        {

            timer.cancel();

        }

    }

    

    public static void invoke(final Socket client) throws IOException

    {

        new Thread(new Runnable()

        {

            public void run()

            {

                String errcmd = "{\"cmd\":-1}";

                String nocmd = "{\"cmd\":0}";



                BufferedReader in = null;

                PrintWriter out = null;

                try

                {

                    in = new BufferedReader(new InputStreamReader(

                            client.getInputStream()));

                    out = new PrintWriter(client.getOutputStream());

                    Integer count = 0;

                    while (true)

                    {

                        String cmdmsg = in.readLine();

                        count++;

                        System.out.println(count);

                        System.out.println("Server received " + cmdmsg);



                        JSONObject jsmsg = JSONObject.fromObject(cmdmsg);

                        System.out.println("JSONObject success");

                        String cmd = jsmsg.getString("cmd");

                        switch (cmd)

                        {

                            case "1":

                                com.progress.cmd1.process(client, jsmsg);

                                break;

                            case "2":

                                com.progress.cmd2.process(client, jsmsg);

                                break;default:

                                out.println(nocmd);

                                out.flush();

                        }

                        if (cmdmsg.equals("bye"))

                        {

                            break;

                        }

                    }

                }

                catch (JSONException ex)

                {

                    System.out.println("JSONObject err");

                    out.println(errcmd);

                    out.flush();

                }

                catch (Exception ex)

                {

                    ex.printStackTrace();

                }

                finally

                {

                    try

                    {

                        in.close();

                    }

                    catch (Exception e)

                    {

                    }

                    try

                    {

                        out.close();

                    }

                    catch (Exception e)

                    {

                    }

                    try

                    {

                        client.close();

                    }

                    catch (Exception e)

                    {

                    }

                }

            }

        }).start();

    }

static class MyClientRefreshTask extends java.util.TimerTask

    {

        public void run()

        {

            refreshClient();

        }

    }

    private static void refreshClient()

    {

        List<SocketClientBean> dels = new ArrayList<SocketClientBean>();

        for (int i = 0; i < MyServer.clientlist.size(); i++)

        {

            if (MyServer.clientlist.get(i).getSocket().isClosed())

            {

                System.out.println("it is the del client!");

                dels.add(clientlist.get(i));

            }

        }

        System.out.println("clientlist num:"+clientlist.size());

        System.out.println("dels num:"+dels.size());

        clientlist.removeAll(dels);

        System.out.println("clientlist left num:"+clientlist.size());

    }



}