拦截器public class EmojiFilter implements Filter {    private FilterConfig filterConfig;    public void init(FilterConfig filterConfig) throws ServletException {        System.out.println("Filter initialized");        this.filterConfig = filterConfig;    }    public void destroy() {        System.out.println("Filter destroyed");        this.filterConfig = null;    }    public void doFilter(ServletRequest request, ServletResponse response,            FilterChain chain) throws IOException, ServletException {        chain.doFilter(new MyRequestWrapper((HttpServletRequest) request), response);    }}

web.xml配置
         
             
      
       EmojiFilter
              
      
       com.qtkj.base.EmojiFilter
              
                  
       
        encoding
                   
       
        UTF-8
               
          
         
             
      
       EmojiFilter
              
      
       /*
          
     

1 实际过滤方法 2 public class MyRequestWrapper extends HttpServletRequestWrapper { 3     public MyRequestWrapper(HttpServletRequest servletRequest) { 4         super(servletRequest); 5     } 6  7     public String[] getParameterValues(String parameter) { 8         String[] results = super.getParameterValues(parameter); 9         if (results == null)10             return null;        11 12         int count = results.length;13         String[] trimResults = new String[count];14         for (int i = 0; i < count; i++) {            15             trimResults[i] = com.qtkj.weixin.utils.EmojiFilter.filterEmoji(results[i].trim());16             trimResults[i]=trimResults[i].replace(" ", "");17         }        18         System.out.println("==========="+trimResults+"----------");19         return trimResults;20     }           21 }22 结合emoji处理方法中的方法