servlet 篇异步

最新推荐文章于 2023-02-16 11:37:17 发布

转载最新推荐文章于 2023-02-16 11:37:17 发布 · 178 阅读

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原文链接：https://my.oschina.net/chenping12/blog/1528188

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#java

servlet 3.0 后提供异步处理支持

1、AsyncContext

servlet 3.0提供异步处理来快速响应web请求

@WebServlet(urlPatterns = "/TestAysn",asyncSupported = true)  //开启异步支持
public class TestAysn extends HttpServlet {
    public void service(HttpServletRequest servletRequest, HttpServletResponse servletResponse) throws ServletException, IOException {
        AsyncContext asyncContext = servletRequest.startAsync(); //获取异步上下文
        asyncContext.start(new Task(asyncContext));  //执行异步任务
        PrintWriter writer = servletResponse.getWriter();
        writer.println("aync before...");
        writer.flush();
    }
}

2、AsyncListener

在异步处理过程监听

public interface AsyncListener extends EventListener {
    void onComplete(AsyncEvent var1) throws IOException;  //处理结束监听

    void onTimeout(AsyncEvent var1) throws IOException;   //超时监听

    void onError(AsyncEvent var1) throws IOException;   //出错监听

    void onStartAsync(AsyncEvent var1) throws IOException;  //异步处理监听
}

转载于:https://my.oschina.net/chenping12/blog/1528188