/**
* Copyright (c) 2005-2012 https://github.com/zhangkaitao
*
* Licensed under the Apache License, Version 2.0 (the "License");
*/
package com.sishuok.chapter3.web.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.concurrent.ExecutorService;
import java.util.concurrent.Executors;
/**
* <p>User: Zhang Kaitao
* <p>Date: 13-6-22 下午10:02
* <p>Version: 1.0
*/
@WebServlet(name = "asyncServlet2", urlPatterns = "/async2", asyncSupported = true)
public class AsyncServlet2 extends HttpServlet {
private final ExecutorService executorService = Executors.newScheduledThreadPool(2);
@Override
protected void doGet(final HttpServletRequest req, final HttpServletResponse resp) throws ServletException, IOException {
resp.setHeader("Connection", "Keep-Alive");
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
out.write("hello async");
out.write("<br/>");
out.flush();
//1、开启异步
final AsyncContext asyncContext = req.startAsync();
//2、设置超时时间，如果不设置如jetty是30000L
asyncContext.setTimeout(10L * 1000); //设置为0表示永不超时
//把任务提交给自己的任务队列
executorService.submit(new Runnable() {
@Override
public void run() {
try {
Thread.sleep(3L * 1000);
PrintWriter out = asyncContext.getResponse().getWriter();
out.write("over");
asyncContext.complete();
} catch (Exception e) {
e.printStackTrace();
}
}
});
//4、当前线程可立即返回
}
}