SpringMVC读取Cookie判断用户是否登录,对每一个action都要进行判断。之前使用jstl标签在页面上判断session如果没有登录就使用如下代码跳转到登录页面。
1
2
3
4
5
6
7
|
< c:if test = "${sessionScope.login == null || sessionScope.login == false}" >
<!-- 未登录 -->
< c:redirect url = "/login" />
</ c:if >
< c:if test = "${sessionScope.login}" >
<!-- 已登录 -->
</ c:if >
|
但是测试发现如果session过期,页面渲染就会无故中断并且不会跳转到登录页面。故尝试使用拦截器来进行登录判断。
拦截器配置文件如下
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
<!-- <mvc:mapping path="/**" /> 如果只写一个*,则不能拦截类似/*/*的请求。静态资源的请求需要判断不进行拦截 -->
< mvc:interceptors >
< mvc:interceptor >
< mvc:mapping path = "/**" />
< bean class = "com.ts.settle.tools.interceptor.LoginInterceptor" >
< property name = "excludedUrls" >
< list >
< value >/login</ value >
< value >/static/</ value >
</ list >
</ property >
</ bean >
</ mvc:interceptor >
</ mvc:interceptors >
|
拦截器实现类如下
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
public class LoginInterceptor implements HandlerInterceptor {
private AvatarLogger logger = AvatarLoggerFactory.getLogger( this .getClass());
private List<String> excludedUrls;
/**
* 在DispatcherServlet完全处理完请求后被调用
* 当拦截器抛出异常时,依然会从当前拦截器往回执行所的拦截器的afterCompletion()
*/
public void afterCompletion(HttpServletRequest request,
HttpServletResponse response, Object handler, Exception exception)
throws Exception {
}
//在业务处理器处理请求执行完成后,生成视图之前执行的动作
public void postHandle(HttpServletRequest request, HttpServletResponse response,
Object handler, ModelAndView modelAndView) throws Exception {
}
/**
* 在业务处理器处理请求之前被调用
* 如果返回false 则退出本拦截器,本拦截器后面的postHandle与afterCompletion不再执行
*/
public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
Object handler) throws Exception {
String requestUri = request.getRequestURI();
for (String url : excludedUrls) {
if (requestUri.contains(url)) {
return true ;
}
}
HttpSession session = request.getSession();
Boolean login = (Boolean) session.getAttribute( "login" );
if (login == null || !login) {
//System.out.println(request.getContextPath());
logger.info( "Pedirect to login page" );
response.sendRedirect(request.getContextPath() + "/login" );
}
return true ;
}
public void setExcludedUrls(List<String> excludedUrls) {
this .excludedUrls = excludedUrls;
}
}
|
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://www.cnblogs.com/umgsai/p/5804766.html