Filter - filter sensitive words

 

 

 1 /**
 2  * 敏感词汇过滤器
 3  */
 4 @WebFilter("/*")
 5 public class SensitiveWordsFilter implements Filter {
 6 
 7 
 8     public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
 9         //1.创建代理对象，增强getParameter方法
10 
11         ServletRequest proxy_req = (ServletRequest) Proxy.newProxyInstance(req.getClass().getClassLoader(), req.getClass().getInterfaces(), new InvocationHandler() {
12             @Override
 13 is              public Object Invoke (Object Proxy, Method, Method, Object [] args) throws the Throwable {
 14                  // enhancement method getParameter
 15                  // determines whether getParameter method 
16                  IF (method.getName (). The equals ( " getParameter " ) ) {
 17                      // reinforcing return value
 18                      // to obtain return 
. 19                      String value = (String) Method.invoke (REQ, args);
 20 is                      IF (value =! null ) {
 21 is                          for (STR String: List) {
 22 is                              IF (value.contains (str)) {
23 is                                  value = value.replaceAll (STR, " *** " );
 24                              }
 25                          }
 26 is                      }
 27                      
28                      return   value;
 29                  }
 30  
31 is                  // determines whether the method name getParameterMap
 32  
33 is                  // whether the judging method name is the getParameterValues 
34 is  
35                  return Method.invoke (REQ, args);
 36              }
 37 [          });
 38 is  
39          // 2. release 
40         the chain.doFilter (proxy_req, RESP);
 41 is      }
 42 is      Private List <String> List = new new the ArrayList <String> (); // sensitive word set 
43 is      public  void the init (the FilterConfig config) throws {ServletException
 44 is  
45          the try {
 46 is              // 1. obtain the true path file 
47              the ServletContext where servletContext = config.getServletContext ();
 48              String realpath = ServletContext.getRealPath ( " / the WEB-INF / classes / sensitive words .txt " );　　// src sensitive words in .txt directory
 49              // 2. read the file 
50             Br = the BufferedReader new new the BufferedReader ( new new the FileReader (realpath));
 51 is              // added to each row of the data file to 3. in list 
52 is              String Line = null ;
 53 is              the while (! (= Br.readLine Line ()) = null ) {
 54 is                  List.add (Line);
 55              }
 56 is  
57 is              br.close ();
 58  
59              . the System OUT .println (List);
 60  
61 is          } the catch (Exception E) {
 62 is              e.printStackTrace ();
 63 is         }
64 
65     }
66 
67     public void destroy() {
68     }
69 
70 }