Java Servlet将值从过滤器传递到Servlet代码

Question

I have a Java HTTP Servlet running in Tomcat. I have a filter that is doing some pre-processing on requests. The filter contains some if/else logic. I want to set a boolean value in my servlet processing code (doGet/doPost) based on which action my filter performed.

What is the correct way to pass this information from my filter to my servlet method? One idea is to update the request via a setAttribute method, but I am not sure if this is the right way.

Answer 1

In your doFilter(ServletRequest request, ServletResponse response, FilterChain chain) method you can use the request object and set an attribute using request.setAttribute method and then get it in your servlet using request.getAttribute .

See docs: http://docs.oracle.com/javaee/6/api/javax/servlet/ServletRequest.html#setAttribute(java.lang.String , java.lang.Object)