import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletRequestWrapper; import javax.servlet.http.HttpSession; public class MyRequest extends HttpServletRequestWrapper { public MyRequest() { super(null); } public MyRequest(HttpServletRequest request) { super(request); // TODO 自动生成的构造函数存根 } @Override public HttpSession getSession(boolean create) { return new MySession(super.getSession(create)); } @Override public HttpSession getSession() { return new MySession(super.getSession()); } }

（3）自定义Filter将Request包装为MyRequest

import java.io.IOException; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.annotation.WebFilter; import javax.servlet.http.HttpServletRequest; @WebFilter("/*") public class MyFilter implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { // TODO 自动生成的方法存根 } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { chain.doFilter(new MyRequest((HttpServletRequest) request), response); } @Override public void destroy() { // TODO 自动生成的方法存根 } }

通过注解配置了Filter，也可以通过原始的web.xml方式配置。

1.https://docs.oracle.com/javaee/7/tutorial/packaging003.htm

2.

3.https://docs.oracle.com/javaee/7/tutorial/webapp005.htm