【filter 页面重定向循环】写一个过滤器造成的页面重定向循环的问题

 1 package com.agen.util;
 2 
 3 import java.io.IOException;
 4 
 5 import javax.servlet.Filter;
 6 import javax.servlet.FilterChain;
 7 import javax.servlet.FilterConfig;
 8 import javax.servlet.ServletException;
 9 import javax.servlet.ServletRequest;
10 import javax.servlet.ServletResponse;
11 import javax.servlet.http.HttpServletRequest;
12 import javax.servlet.http.HttpServletResponse;
13 import javax.servlet.http.HttpSession;
14 
15 import org.springframework.util.Assert;
16 import org.springframework.util.StringUtils;
17 
18 import com.agen.entity.User;
19 
20 /**
21  * 首先写一个登录权限过滤类--LoginFilter类实现Filter接口
22  * @author 申旭栋
23  *下面这三个方法是必须要实现的
24  */
25 public class LoginFilter implements Filter {
26 
27     @Override
28     public void init(FilterConfig filterConfig) throws ServletException {
29         // TODO Auto-generated method stub
30 
31     }
32 
33     
34     @Override
35     public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {
36         // 获得在下面代码中要用的request,response,session对象
37         HttpServletRequest servletRequest = (HttpServletRequest) request;
38         HttpServletResponse servletResponse = (HttpServletResponse) response;
39         HttpSession session = servletRequest.getSession();
40 
41         // 获得用户请求的URI
42         String path = servletRequest.getRequestURI();
43         
44         // 从session里取用户的登陆ID
45         User user = (User) session.getAttribute("user");
46 
47         // 登陆页面无需过滤
48         if("/biologyInfo/".equals(path) || "/biologyInfo/login/login1.htmls".equals(path)) {
49             chain.doFilter(servletRequest, servletResponse);
50             return;
51         }
52 
53         // 判断如果没有取到员工信息,就跳转到登陆页面  StringUtils.isEmpty(username)等价于username == null || "".equals(username)
54         if (user == null) {
55             // 跳转到登陆页面
56             servletResponse.sendRedirect("login/login1.htmls");
57         } else {
58             // 已经登陆,继续此次请求
59             chain.doFilter(request, response);
60         }
61 
62     }
63 
64     @Override
65     public void destroy() {
66         // TODO Auto-generated method stub
67 
68     }
69 
70 }

 1     <!-- 配置了springmvc拦截的url为以.hmls结尾的请求 -->
 2     <servlet-mapping>
 3         <servlet-name>rest</servlet-name>
 4         <url-pattern>*.htmls</url-pattern>
 5     </servlet-mapping>
 6 
 7     <filter-mapping>
 8         <filter-name>openSessionInViewFilter</filter-name>
 9         <url-pattern>/*</url-pattern>
10     </filter-mapping>

1  if (user == null) {
2             // 跳转到登陆页面
3             servletResponse.sendRedirect("login/login1.htmls");
4         } else {
5             // 已经登陆,继续此次请求
6             chain.doFilter(request, response);
7         }

1 if (user == null) {
2             // 跳转到登陆页面
3             servletResponse.sendRedirect("/biologyInfo/login/login1.htmls");
4         } else {
5             // 已经登陆,继续此次请求
6             chain.doFilter(request, response);
7         }

1 @Controller()
2 @RequestMapping("login")
3 public class LoginController {