zbb20170926 SpringMVC javaweb 登录地址过滤器 没有登录跳转到登录页面

AuthFilter 

package com.zbb.filter;

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;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet Filter implementation class AuthFilter
 */
@WebFilter("/AuthFilter")
public class AuthFilter implements Filter {

    /**
     * Default constructor.
     */
    public AuthFilter() {
        // TODO Auto-generated constructor stub
    }

    /**
     * @see Filter#destroy()
     */
    public void destroy() {
        // TODO Auto-generated method stub
    }

    /**
     * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
     */
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain)
            throws IOException, ServletException {
        // TODO Auto-generated method stub
        // place your code here
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        // 获取根目录所对应的绝对路径 /jumper/index.jsp
        String currentURL = request.getRequestURI();

        // 截取到当前文件名用于比较 /index.jsp
        String targetURL = currentURL.substring(currentURL.indexOf("/", 1), currentURL.length());
        // System.out.println(targetURL);
        // 如果session不为空就返回该session，如果为空就返回null
        HttpSession session = request.getSession(false);
        boolean canLogin = true;
        // 登录地址不过滤
        if (currentURL.contains("jumper/jsp/admin/login/login.jsp")) {
            canLogin = false;
        }
        if (currentURL.contains("jumper/admin/login/validateLogin")) {
            canLogin = false;
        }
        // 静态文件不过滤
        if (currentURL.contains("jumper/static")) {
            canLogin = false;
        }
        // ui页面不过滤
        if (currentURL.contains("jumper/jsp/ui/") || currentURL.contains("jumper/index.jsp")) {
            canLogin = false;
        }

        if (canLogin) {
            // 判断当前页面是否是重顶次昂后的登陆页面页面，如果是就不做session的判断，防止死循环
            if (session == null || session.getAttribute("user") == null) {
                // 如果session为空表示用户没有登陆就重定向到login.jsp页面
                // System.out.println("request.getContextPath()=" +
                // request.getContextPath());
                response.sendRedirect(request.getContextPath() + "/jsp/admin/login/login.jsp");
                return;
            }
        }
        // 继续向下执行
        chain.doFilter(request, response);
    }

    /**
     * @see Filter#init(FilterConfig)
     */
    public void init(FilterConfig fConfig) throws ServletException {
        // TODO Auto-generated method stub
    }

}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    id="WebApp_ID" version="3.0">
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:/applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:/springmvc-servlet.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <filter>
        <filter-name>AuthFilter</filter-name>
        <filter-class>com.zbb.filter.AuthFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>AuthFilter</filter-name>
        <url-pattern>*</url-pattern>
    </filter-mapping>
</web-app>