过滤器使用之全站乱码处理

 1 public class EncodeFilter implements Filter {
 2     private String encode;
 3     public void init(FilterConfig config) throws ServletException {
 4         encode = config.getInitParameter("encode");
 5     }
 6     class MyHSR extends HttpServletRequestWrapper{
 7         private HttpServletRequest request;
 8         private boolean hasEncode = false;
 9         public MyHSR(HttpServletRequest request) {
10             super(request);
11             this.request = request;
12         }
13         @Override
14         public Map<String,String[]> getParameterMap() {
15             //获取提交的方式post/get
16             if("POST".equals(request.getMethod())){
17                 try {
18                     request.setCharacterEncoding(encode);
19                 } catch (UnsupportedEncodingException e) {
20                     e.printStackTrace();
21                 }
22                 return request.getParameterMap();
23             }else if("GET".equals(request.getMethod())){
24                 //定义一个Map集合对象
25                 Map<String,String[]> map = request.getParameterMap();
26                 if(!hasEncode){
27                     //遍历map
28                     for(Map.Entry<String, String[]> entry:map.entrySet()){
29                         //获取原来的vals
30                         String[] vals = entry.getValue();
31                         //遍历数组处理乱码
32                         for (int i = 0;i<vals.length;i++) {
33                             try {
34                                 vals[i] = new String(vals[i].getBytes("ISO8859-1"),encode);
35                             } catch (UnsupportedEncodingException e) {
36                                 e.printStackTrace();
37                             }
38                         }
39                     }
40                     hasEncode = true;
41                 }
42                 return map;
43             }else{//既不是get方式也不是post方式
44                 return super.getParameterMap();
45             }
46         }
47         @Override
48         public String[] getParameterValues(String name) {
49             return getParameterMap().get(name);
50         }
51         @Override
52         public String getParameter(String name) {
53             return getParameterValues(name)==null?"":getParameterValues(name)[0];
54         }
55     }
56     public void doFilter(ServletRequest request, ServletResponse response,
57             FilterChain chain) throws IOException, ServletException {
58         response.setContentType("text/html;charset=utf-8");
59         chain.doFilter(new MyHSR((HttpServletRequest)request), response);
60 
61     }
62     public void destroy() {
63     }
64 }