在Tomcat下启动线程

// web.xml
<context-param>
    <param-name>com.example.myapp.servlet.context</param-name>
    <param-value>/myapp</param-value>
</context-param>
<servlet>
    <servlet-name>MyServlet</servlet-name>
    <servlet-class>com.example.myapp.servlet.MyServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
</servlet>

// MyServlet.java
public class MyServlet extends HttpServlet {
    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.getWriter().println("Hello, this is MyServlet!");
    }
}

// main.java
public class main {
    public static void main(String[] args) {
        Thread thread = new Thread(new MyRunnable());
        thread.start();
    }
}

// MyRunnable.java
public class MyRunnable implements Runnable {
    @Override
    public void run() {
        try {
            URL url = new URL("http://www.example.com");
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            connection.connect();
            InputStream inputStream = connection.getInputStream();
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }
            reader.close();
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}