包装 request Demo

 1 //包装request，增强getParameter方法
 2     class MyReq extends HttpServletRequestWrapper{
 3         private HttpServletRequest req;
 4         public MyReq(HttpServletRequest req) {//构造，必须
 5             super(req);
 6             this.req=req;
 7         }
 8         
 9         @Override
10         public String getParameter(String name) {//返回单个参数
11             String value=req.getParameter(name);
12             if(req.getMethod().equals("GET"))
13             {
14                 try {
15                     value=new String(value.getBytes("ISO-8859-1"),"UTF-8");
16                 } catch (UnsupportedEncodingException e) {
17                     e.printStackTrace();
18                 }
19             }
20             return value;
21         }
22         
23         @Override
24         public Map getParameterMap() {//返回map参数
25             Map<String, String[]> map=req.getParameterMap();
26             if(req.getMethod().equals("GET"))
27             {
28                 Iterator<String[]> it=  map.values().iterator();
29                 while(it.hasNext())
30                 {
31                     String[] ss= it.next();
32                     for(int i=0;i<ss.length;i++)
33                     {
34                         try {
35                             ss[i]=new String(ss[i].getBytes("ISO-8859-1"),req.getCharacterEncoding());
36                         } catch (UnsupportedEncodingException e) {
37                             e.printStackTrace();
38                         }
39                     }
40                 }                
41             }            
42             return map;
43         }
44         
45         @Override
46         public String[] getParameterValues(String name) {//String[] 参数
47             String[] values=req.getParameterValues(name);
48             if(req.getMethod().equals("GET"))
49             {
50                 for(int i=0;i<values.length;i++)
51                 {
52                     try {
53                         values[i]=new String(values[i].getBytes("ISO-8869-1"),req.getCharacterEncoding());
54                     } catch (UnsupportedEncodingException e) {
55                         e.printStackTrace();
56                     }
57                 }
58                 
59             }            
60             return values;
61         }
62             
63     }