filterChain.doFilter(new HttpServletRequestWrapper((HttpServletRequest) req), new HttpServletResponseWrapper((HttpServletResponse) resp)); //真正处理async请求 if (req.isAsyncSupported() && req.isAsyncStarted()) { AsyncContext context = req.getAsyncContext(); System.out.println("Leaving " + thi...
①.配置filter的dispatcher值为ASYNC,servlet的async-supported值为true. <filter> <filter-name>roleFilter</filter-name> <filter-class>com.filter.MyRoleFilter</filter-class> <init-param> username www </init-param> </filter> <filter-mapping> <filter-name>roleFilter</filter-name> <url-pattern>*....
@WebFilter(urlPatterns = "/demo",asyncSupported = true)public class DemoFilter implements Filter{...} 一个简单的模拟异步处理的 Servlet 示例如下：@WebServlet(urlPatterns = "/demo", asyncSupported = true)public class AsyncDemoServlet extends HttpServlet { @Override public void doGet(HttpSe...
--配置过滤器--><filter><filter-name>FilterDemo1</filter-name><filter-class>com.itheima.web.filter.FilterDemo1</filter-class></filter><filter-mapping><filter-name>FilterDemo1</filter-name><url-pattern>/*</url-pattern> </filter-mapping> 3)测试部署 部署项目 测试结果 案例的问题分析及解决 ...
5. ASYNC:异步访问资源被拦,默认不拦 * web.xml配置 *在<filter-mapping>中设置<dispatcher></dispatcher>标签即可 过滤器链: * 执行顺序:如果有n个过滤器: 1. 过滤器1 2. 过滤器2 ... 3. 执行资源 ... 4. 过滤器2 5. 过滤器1 * 过滤器链先后顺序问题: ...
@WebServlet(urlPatterns = "/servlet/demo", asyncSupported = false) public class DemoServlet extends HttpServlet { @Override public void init() throws ServletException { System.out.println("init my servlet"); super.init(); } @Override
@WebFilter(asyncSupported = true, description = "filterdemo", urlPatterns = { "/*" })在myeclipse中就必须在web.xml逐一配置出来有： <filter> <filter-name>Filter1</filter-name> <filter-class>cn.itcast.filter.Filter1</filter-class> </filter> <!-- 配置过滤器去拦截哪个资源 ...
请求被Servlet容器接收,然后从Servlet容器(例如Tomcat)中获取一个线程来执行,请求被流转到Filter链进行处理,然后查找具体的Servlet进行处理。 Servlet具体处理请求参数或者请求内容来决定请求的性质。 Servlet内使用“req.startAsync();”开启异步处理,返回异步处理上下文Async-Context对象,然后开启异步线程(可以是Tomcat容器中...
可以是netty或者裸 io），把流里的http文本取出来，转给 servlet具体实现的java代码，比如 filter ...
该线程是不会知晓任何filter。如果filter是希望单独的线程处理响应,则需要包装响应对象,然后将包装好的响应对象传递给下一个filter,最终响应对象到达servlet。 如果响应对象被包装过,应用程序直接写被包装过的响应对象的内容给客户端。 ServletRequest public AsyncContext startAsync(ServletRequest req, ServletResponse res...