//包装request，增强getParameter方法

     class MyReq extends HttpServletRequestWrapper{

         private HttpServletRequest req;

         public MyReq(HttpServletRequest req) {//构造，必须

             super(req);

             this.req=req;

         }

         @Override

         public String getParameter(String name) {//返回单个参数

             String value=req.getParameter(name);

             if(req.getMethod().equals("GET"))

             {

                 try {

                     value=new String(value.getBytes("ISO-8859-1"),"UTF-8");

                 } catch (UnsupportedEncodingException e) {

                     e.printStackTrace();

                 }

             }

             return value;

         }

         @Override

         public Map getParameterMap() {//返回map参数

             Map<String, String[]> map=req.getParameterMap();

             if(req.getMethod().equals("GET"))

             {

                 Iterator<String[]> it=  map.values().iterator();

                 while(it.hasNext())

                 {

                     String[] ss= it.next();

                     for(int i=0;i<ss.length;i++)

                     {

                         try {

                             ss[i]=new String(ss[i].getBytes("ISO-8859-1"),req.getCharacterEncoding());

                         } catch (UnsupportedEncodingException e) {

                             e.printStackTrace();

                         }

                     }

                 }

             }

             return map;

         }

         @Override

         public String[] getParameterValues(String name) {//String[] 参数

             String[] values=req.getParameterValues(name);

             if(req.getMethod().equals("GET"))

             {

                 for(int i=0;i<values.length;i++)

                 {

                     try {

                         values[i]=new String(values[i].getBytes("ISO-8869-1"),req.getCharacterEncoding());

                     } catch (UnsupportedEncodingException e) {

                         e.printStackTrace();

                     }

                 }

             }

             return values;

         }

     }