HTTP Status 404是不是Filter限制死了,该如何处理

HTTP Status 404是不是Filter限制死了

Java code

package uri;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.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;public class UserLoginFilter implements Filter {    private String redirectURI = null;// 检查路径    public UserLoginFilter() {    }    public void destroy() {    }    public void doFilter(ServletRequest arg0, ServletResponse arg1,            FilterChain filterChain) throws IOException, ServletException {        // 配置参数        HttpServletRequest request = (HttpServletRequest) arg0;        HttpServletResponse response = (HttpServletResponse) arg1;        // 创建会话        HttpSession session = request.getSession();        // 判断用户是否已经登录        if (session.getAttribute("User") == null) {            // 设置拦截的路径            if (!request.getRequestURI().contains("Login")                    || request.getRequestURI().contains("functionMenu")                    || request.getRequestURI().contains("showFiles")) {                // 不包含登录路径的强制跳转到登录页面                request.getRequestDispatcher(redirectURI).forward(request,                        response);                return;            }            // 包含的就放行            filterChain.doFilter(request, response);            return;        }else{            //已登录就放行            filterChain.doFilter(request, response);            return;        }    }    public void init(FilterConfig arg0) throws ServletException {        redirectURI = "Loging.jsp";// 跳转页面    }}

Servlet

Java code

//调用登录方法返回一个用户        User empUser=new User();        empUser=LoginDao.Login(mallID, password);        //会话跟踪用户        HttpSession userSession=request.getSession();        userSession.setAttribute("User", empUser);

web.xml

Java code

  <session-config>      <session-timeout>15</session-timeout>  </session-config>    <filter>      <filter-name>UserLoginFilter</filter-name>    <filter-class>uri.UserLoginFilter</filter-class>  </filter>  <filter-mapping>      <filter-name>UserLoginFilter</filter-name>      <url-pattern>/*</url-pattern>  </filter-mapping>

加了这个UserLoginFilter后就什么页面都打不开了,大哥们帮我看看那里除了问题!

[解决办法]
redirectURI 没有值 为null
findforward的时候没有地址怎么跳转呢
为redirectURI 设置跳转路径即可
[解决办法]
404是说找不到资源,肯定是转发的时候路径不对了,路径可能写错了,当前的请求路径可能
aa/b.jsp
你转发的话如果是
aa/Login.jsp
可能就会错了.
试试
public void init(FilterConfig arg0) throws ServletException {
redirectURI = "/Loging.jsp";

}
或者是直接使用重定向,而不是转发.

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