java代碼過濾emoji表情

可以新建一個過濾器的類，在類中書寫如下代碼:

public static String filterEmoji(String source) { 

          if (source != null )

          {

              Pattern emoji = Pattern.compile ( "[\ud83c\udc00-\ud83c\udfff]|[\ud83d\udc00-\ud83d\udfff]|[\u2600-\u27ff]" ,Pattern.UNICODE_CASE | Pattern . CASE_INSENSITIVE ) ;

              Matcher emojiMatcher = emoji.matcher(source);

              if ( emojiMatcher.find())

              {

                  source = emojiMatcher.replaceAll( "*" );

                  return source ;

              }

          return source;

         }

         return source; 

      }

 

如果沒有改變的話，可以在該類中書寫以下代碼：

private static final long serialVersionUID = -5916500037685553487L;
    public void destroy() {
       // TODO Auto-generated method stub
    }

    @SuppressWarnings("unchecked")
    public void doFilter(ServletRequest request, ServletResponse response,
        FilterChain arg2) throws IOException, ServletException {
       HttpServletRequest servletrequest = (HttpServletRequest) request;
       //新加代碼http://www.2cto.com/kf/201512/455191.html
       HttpServletResponse servletresponse = (HttpServletResponse) response;
       String param = "";
       String paramValue = "";

       servletresponse.setContentType("text/html");
       servletresponse.setCharacterEncoding("UTF-8");
       servletrequest.setCharacterEncoding("UTF-8");
       java.util.Enumeration params = request.getParameterNames();
       while (params.hasMoreElements()) {

        param = (String) params.nextElement();
        String[] values = servletrequest.getParameterValues(param);//獲得每個參數的value
       
        for (int i = 0; i < values.length; i++) {

         paramValue = values[i];
        
         
         paramValue = paramValue.replaceAll("<script>", "(*");
         paramValue = paramValue.replaceAll("</script>", ")");
         paramValue = paramValue.replaceAll("[\ud83c\udc00-\ud83c\udfff]|[\ud83d\udc00-\ud83d\udfff]|[\u2600-\u27ff]", ""); //過濾emoji表情
        
         
        //這里還可以增加，如領導人 自動轉義成****,可以從數據庫中讀取非法關鍵字。
         values[i] = paramValue;
        }

    //把轉義后的參數重新放回request中
        request.setAttribute(param, paramValue);
       }
       //繼續向下

       arg2.doFilter(request, response);

    }

    public void init(FilterConfig arg0) throws ServletException {
       // 初始化

    }
}