Tomcat7实现Servlet3异步请求

pom.xml：

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.0.1</version>
    <scope>provided</scope>
</dependency>

web.xml：

<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
	<display-name>Servlet3-Demo</display-name>
</web-app>

AsyncServlet：

@WebServlet(value = "/async-demo", asyncSupported = true)
public class AsyncServlet extends HttpServlet {

	ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(2);

	public void doGet(HttpServletRequest req, HttpServletResponse res) {
		AsyncContext aCtx = req.startAsync(req, res);

		executor.execute(new AsyncHandler(aCtx));
	}

}

AsyncHandler：

public class AsyncHandler implements Runnable {

	private AsyncContext ctx;

	public AsyncHandler(AsyncContext ctx) {
		this.ctx = ctx;
	}

	@Override
	public void run() {
		System.out.println("Dispatch Time: " + System.currentTimeMillis());

		ctx.dispatch("/index.jsp");
	}

}