Tomcat启动后再启动另一个线程执行别的任务与Servlet获取Spring中的参数

最新推荐文章于 2025-12-04 18:23:18 发布

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本文介绍了一个基于Servlet的简单定时任务处理机制。通过继承HttpServlet并重写doGet和doPost方法来响应HTTP请求，同时利用Java Timer进行周期性任务调度。

年后的第一篇，先上代码：

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

//此为Servlet类
public class NucleonEventProcessor extends HttpServlet {
	private static final long serialVersionUID=-9045451275234606838L;
	int num=0;//保证线程启动一次后就不再启动


	Timer timer=new Timer();

	//以下两个为了从spring中获取注入的service值
	ServletContext servletContext=null;
	WebApplicationContext webApplicationContext=null;

	//以下为某个Service
	//PersonService personService=null;


	/**
	 * Constructor of the object.
	 */
	public NucleonEventProcessor() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		out.println("  <BODY>");
		out.print("    This is ");
		out.print(this.getClass());
		out.println(", using the GET method");
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		out.println("  <BODY>");
		out.print("    This is ");
		out.print(this.getClass());
		out.println(", using the POST method");
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
		FutureTask<String> task=new FutureTask<String>(new Callable<String>() {

			@Override
			public String call() throws Exception {
				// TODO Auto-generated method stub
				start();
				return "Collection Completed";
			}
		});
		servletContext=getServletContext();
		webApplicationContext=WebApplicationContextUtils.getWebApplicationContext(servletContext);
		//获取spring配置文件中的service
		//personService=(PersonService)webApplicationContext.getBean("personService");

		//线程启动
		new Thread(task).start();
	}
	private void start(){
		//要执行的方法
		if(num=0){
			timeschedule();
			num++;
		}
	}
	public void timeschedule(){
		timer.schedule(new TimerTask() {
			@Override
			public void run() {
				// TODO Auto-generated method stub
				//要执行的方法
				start();
			}
		}, 1000,2000);//1秒后执行，每隔2秒执行一次
	}
}