servlet3.0异步实现

package com.xindun.server.servlet;

import javax.servlet.AsyncContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;

@WebServlet(urlPatterns = "/demo", asyncSupported = true)
public class AsyncDemoServlet extends HttpServlet {
    
    
    public void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws IOException, ServletException {
    
    
        resp.setContentType("text/html;charset=UTF-8");


        PrintWriter out = resp.getWriter();


        out.println("进入Servlet的时间：" + new Date() + ".");


        out.flush();


        //在子线程中执行业务调用，并由其负责输出响应，主线程退出


        AsyncContext ctx = req.startAsync();


        new Thread(new Executor(ctx)).start();


        out.println("结束Servlet的时间：" + new Date() + ".");


        out.flush();


    }


}


class Executor implements Runnable {
    
    


    private AsyncContext ctx = null;


    public Executor(AsyncContext ctx) {
    
    


        this.ctx = ctx;


    }


    public void run() {
    
    


        try {
    
    


            //等待十秒钟，以模拟业务方法的执行


            Thread.sleep(10000);


            PrintWriter out = ctx.getResponse().getWriter();


            out.println("业务处理完毕的时间：" + new Date() + ".");


            out.flush();


            ctx.complete();


        } catch (Exception e) {
    
    


            e.printStackTrace();


        }
    }
}

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