基于tomcat8 编写字符编码Filter过滤器无效问题的解决方法

<span style="font-size:12px;">package com.chaoxing.newspaper.web.filter;
import java.io.IOException;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class CharacterEncodingFilter implements Filter {
	public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
		System.out.println("过滤器执行");
		 final HttpServletRequest request = (HttpServletRequest) req; 
	    HttpServletResponse response = (HttpServletResponse) res; 
	     
	    //解决post请求的中文乱码 
	    request.setCharacterEncoding("UTF-8"); 
	    response.setCharacterEncoding("UTF-8"); 
	    response.setContentType("text/html;charset=UTF-8");
		
		chain.doFilter((ServletRequest) Proxy.newProxyInstance(this.getClass().getClassLoader(), request.getClass().getInterfaces(), new InvocationHandler(){
			@Override
			public Object invoke(Object proxy, Method method, Object[] args)
					throws Throwable {
				String methodname = method.getName(); //拿到当前的方法 
	      if(methodname.equals("getParameter")){ 
	        //执行request.getparameter获取结果 
	        String value = (String) method.invoke(request, args); 
	        if(value==null){ 
	          return null; 
	        } 
	        if(!request.getMethod().equalsIgnoreCase("get")){ //判断是为get请求 
	          return value; 
	        } 
	        System.out.println(value+"|||||");
	        //转换编码返回 
	        value = new String(value.getBytes("UTF-8"),"UTF-8"); 
	        System.out.println(value+"=======");
	        return value; 
	      } 
	      //交给request执行请求 
	      return method.invoke(request, args); 
	      } 
			
		} ), res);
	}
	public void init(FilterConfig fConfig) throws ServletException {
		System.out.println("过滤器初始化");
	}
	@Override
	public void destroy() {
		System.out.println("过滤器完成");
	}
}</span>

<span style="font-size:12px;"> <!--解决全站乱码的filter  --> 
 <filter> 
  <filter-name>CharacterEncoding</filter-name> 
  <filter-class>com.XXX.web.filter.CharacterEncodingFilter</filter-class> 
 </filter> 
 <filter-mapping> 
  <filter-name>CharacterEncoding</filter-name> 
  <url-pattern>/*</url-pattern> 
 </filter-mapping></span>