Filter 编码问题

来源：互联网发布：淘宝已发货可以退款吗编辑：程序博客网时间：2024/06/07 20:26

public class EncodingFilter implements Filter {
   private FilterConfig config = null;
   private String encode = null;
   public void destroy() {

   }

   public void doFilter(ServletRequest request, ServletResponse response,
           FilterChain chain) throws IOException, ServletException {
       response.setContentType("text/html;charset="+encode); //--解决响应乱码
       chain.doFilter(new MyHttpServletRequest((HttpServletRequest) request), response);//--包装改造request中和获取请求参数相关的方法解决请求参数乱码
   }

   public void init(FilterConfig filterConfig) throws ServletException {
       this.config = filterConfig;
       encode = config.getInitParameter("encode") == null?"utf-8":config.getInitParameter("encode");
   }
   class MyHttpServletRequest extends HttpServletRequestWrapper{
       private HttpServletRequest request = null;
       private boolean isNotEncode = true;
       public MyHttpServletRequest(HttpServletRequest request) {
           super(request);
           this.request = request;
       }

       @Override
       public Map getParameterMap() {
           try{
               if(request.getMethod().equalsIgnoreCase("POST")){//--如果是post提交,一行代码解决post提交请求参数乱码
                   request.setCharacterEncoding(encode);
                   return request.getParameterMap();
               }else if(request.getMethod().equalsIgnoreCase("GET")){//--如果是get提交,则应该手动编解码解决乱码
                   Map<String,String[]> map = request.getParameterMap();//获取有乱码的map
                   if(isNotEncode){//只能在第一次解决乱码
                       for(Map.Entry<String, String[]> entry : map.entrySet()){//遍历map,解决所有值的乱码
                           String [] vs = entry.getValue();
                           for(int i=0;i<vs.length;i++){
                               vs[i] = new String(vs[i].getBytes("iso8859-1"),encode);
                           }
                       }
                       isNotEncode = false;//设置为false,第二次就不会再进这个代码块了
                   }
                   return map;
               }else{
                   return request.getParameterMap();
               }
           }catch (Exception e) {
               e.printStackTrace();
               throw new RuntimeException(e);
           }
       }

       @Override
       public String[] getParameterValues(String name) {
           return (String[]) getParameterMap().get(name);
       }

       @Override
       public String getParameter(String name) {
           return getParameterValues(name) == null ? null : getParameterValues(name)[0];
       }


   }
}

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