Spring MVC，攔截器實現session控制

未登錄，不允許訪問background文件夾內的頁面，那如何判斷是否登錄呢？background是關鍵目錄，每個操作該目錄的人都需要寫在日志表中，如何實現呢？攔截器是實現方案之一。

(1) 在com.geloin.spring.interceptor包中添加SystemInterceptor，並使其繼承HandlerInterceptor

1. /** 
2.  * 
3.  * @author geloin 
4.  * @date 2012-3-27 下午2:29:35 
5.  */  
6. package com.geloin.spring.interceptor;  
7.   
8. import java.io.PrintWriter;  
9. import java.util.Iterator;  
10. import java.util.Map;  
11.   
12. import javax.annotation.Resource;  
13. import javax.servlet.http.HttpServletRequest;  
14. import javax.servlet.http.HttpServletResponse;  
15.   
16. import org.springframework.stereotype.Repository;  
17. import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;  
18.   
19. import com.embest.ruisystem.form.SystemLoggerForm;  
20. import com.embest.ruisystem.form.SystemUserForm;  
21. import com.embest.ruisystem.service.SystemLoggerService;  
22. import com.embest.ruisystem.util.Constants;  
23. import com.embest.ruisystem.util.DataUtil;  
24.   
25. /** 
26.  *  
27.  * @author geloin 
28.  * @date 2012-3-27 下午2:29:35 
29.  */  
30. @Repository  
31. public class SystemInterceptor extends HandlerInterceptorAdapter {  
32.   
33.     @Resource(name = "systemLoggerService")  
34.     private SystemLoggerService systemLoggerService;  
35.   
36.     /* 
37.      * (non-Javadoc) 
38.      *  
39.      * @see 
40.      * org.springframework.web.servlet.handler.HandlerInterceptorAdapter#preHandle 
41.      * (javax.servlet.http.HttpServletRequest, 
42.      * javax.servlet.http.HttpServletResponse, java.lang.Object) 
43.      */  
44.     @SuppressWarnings({ "rawtypes", "unchecked" })  
45.     @Override  
46.     public boolean preHandle(HttpServletRequest request,  
47.             HttpServletResponse response, Object handler) throws Exception {  
48.   
49.         request.setCharacterEncoding("UTF-8");  
50.         response.setCharacterEncoding("UTF-8");  
51.         response.setContentType("text/html;charset=UTF-8");  
52.   
53.         // 後台session控制   
54.         String[] noFilters = new String[] { "login.html", "veriCode.html",  
55.                 "index.html", "logout.html" };  
56.         String uri = request.getRequestURI();  
57.   
58.         if (uri.indexOf("background") != -1) {  
59.             boolean beFilter = true;  
60.             for (String s : noFilters) {  
61.                 if (uri.indexOf(s) != -1) {  
62.                     beFilter = false;  
63.                     break;  
64.                 }  
65.             }  
66.             if (beFilter) {  
67.                 Object obj = request.getSession().getAttribute(  
68.                         Constants.LOGINED);  
69.                 if (null == obj) {  
70.   
71.                     // 未登錄   
72.                     PrintWriter out = response.getWriter();  
73.                     StringBuilder builder = new StringBuilder();  
74.                     builder.append("<script type=\"text/javascript\" charset=\"UTF-8\">");  
75.                     builder.append("alert(\"頁面過期，請重新登錄\");");  
76.                     builder.append("window.top.location.href=\"");  
77.                     builder.append(Constants.basePath);  
78.                     builder.append("/background/index.html\";</script>");  
79.                     out.print(builder.toString());  
80.                     out.close();  
81.                     return false;  
82.                 } else {  
83.                     // 添加日志   
84.                     String operateContent = Constants.operateContent(uri);  
85.                     if (null != operateContent) {  
86.                         String url = uri.substring(uri.indexOf("background"));  
87.                         String ip = request.getRemoteAddr();  
88.                         Integer userId = ((SystemUserForm) obj).getId();  
89.                         SystemLoggerForm form = new SystemLoggerForm();  
90.                         form.setUserId(userId);  
91.                         form.setIp(ip);  
92.                         form.setOperateContent(operateContent);  
93.                         form.setUrl(url);  
94.                         this.systemLoggerService.edit(form);  
95.                     }  
96.                 }  
97.             }  
98.         }  
99.   
100.         Map paramsMap = request.getParameterMap();  
101.   
102.         for (Iterator<Map.Entry> it = paramsMap.entrySet().iterator(); it  
103.                 .hasNext();) {  
104.             Map.Entry entry = it.next();  
105.             Object[] values = (Object[]) entry.getValue();  
106.             for (Object obj : values) {  
107.                 if (!DataUtil.isValueSuccessed(obj)) {  
108.                     throw new RuntimeException("有非法字符：" + obj);  
109.                 }  
110.             }  
111.         }  
112.   
113.         return super.preHandle(request, response, handler);  
114.     }  
115.   
116. }  

1. <mvc:interceptors>  
2.     <bean class="com.geloin.spring.interceptor.SystemInterceptor" />  
3. </mvc:interceptors>