filter 拦截ajax请求

(1)编写filter

/** * 拦截器示例 * @author chenpengye * 2015年12月10日 上午10:23:50 */public class SessonFilter  implements Filter {    private static Logger log = LoggerFactory.getLogger(SessonFilter.class);    @Override    public void init(FilterConfig filterConfig) throws ServletException {        //empty implement    }    @Override    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)            throws IOException, ServletException {        HttpServletRequest httpRequest = (HttpServletRequest) request;        HttpServletResponse httpResponse = (HttpServletResponse) response;        HttpSession session = httpRequest.getSession();        String uri = httpRequest.getRequestURI();        String ctxpath = httpRequest.getContextPath();        String userid = (String)session.getAttribute("userid");        if(uri.contains("/user/login") || uri.contains("/user/regPage") ){            chain.doFilter(request, response);        }else{              if(userid == null){                String contextPath = httpRequest.getContextPath();                String redirect =  contextPath ;                //ajax session 过期处理                //1:判断是否是ajax请求                if (httpRequest.getHeader("x-requested-with") != null                         && "XMLHttpRequest".equalsIgnoreCase(httpRequest.getHeader("x-requested-with"))) {                       //向http头添加 状态 sessionstatus                    httpResponse.setHeader("sessionstatus","timeout");                    httpResponse.setStatus(403);                    //向http头添加登录的url                    httpResponse.addHeader("loginPath", ctxpath);                    chain.doFilter(request, response);                    log.debug("ajax request");                    return ;                }                httpResponse.sendRedirect(redirect);                return;            }else{                chain.doFilter(request, response);            }        }    }    @Override    public void destroy() {        //empty implement    }}
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
50
51
52
53
54
55
56
57
58
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
50
51
52
53
54
55
56
57
58

主要参考

//ajax session 过期处理//1:判断是否是ajax请求if (httpRequest.getHeader("x-requested-with") != null                         && "XMLHttpRequest".equalsIgnoreCase(httpRequest.getHeader("x-requested-with"))) {       //向http头添加 状态 sessionstatus    httpResponse.setHeader("sessionstatus","timeout");    httpResponse.setStatus(403);    //向http头添加登录的url    httpResponse.addHeader("loginPath", ctxpath);    chain.doFilter(request, response);    log.debug("ajax request");    return ;}
1
2
3
4
5
6
7
8
9
10
11
12
13
1
2
3
4
5
6
7
8
9
10
11
12
13

(2)配置js

//ajax完成时回调函数$(document).ajaxComplete(function(event, xhr, settings) {    //从http头信息取出 在filter定义的sessionstatus，判断是否是 timeout    if(xhr.getResponseHeader("sessionstatus")=="timeout"){         //从http头信息取出登录的url ＝ loginPath        if(xhr.getResponseHeader("loginPath")){            alert("会话过期，请重新登陆!");            //打会到登录页面            window.location.replace(xhr.getResponseHeader("loginPath"));          }else{              alert("请求超时请重新登陆 !");          }      }  }); 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14