filter 过滤emoji

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
<!-- emoji过滤 -->
    <filter>
        <filter-name>EmojiFilter</filter-name>
        <filter-class>com.qtkj.base.EmojiFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>EmojiFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

 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