关于SSH中tomcat下中文名称图片不显示的问题

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import
java.io.IOException;

import
java.net.URLDecoder;

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;

public
class EncodingFilter implements
Filter{

    String encoding=null;

     FilterConfig filterConfig=null;

     //销毁方法

     public
void destroy() {

      // TODO Auto-generated method stub

      this.encoding=null;

      this.filterConfig=null;

     }

     //过滤处理方法

     public
void doFilter(ServletRequest request, ServletResponse response,

       FilterChain chain) throws
IOException, ServletException {

      // TODO Auto-generated method stub

       HttpServletRequest req = (HttpServletRequest) request;

       String uri = req.getRequestURI();

       String ch = URLDecoder.decode(uri, encoding);

       if(uri.equals(ch)) {

           chain.doFilter(req, response);

           return;

       }

       ch = ch.substring(req.getContextPath().length());

       filterConfig.getServletContext().getRequestDispatcher(ch).forward(req, response);

     }

     //初始化方法

     public
void init(FilterConfig filterConfig) throws
ServletException {

      this.filterConfig=filterConfig;

      this.encoding=filterConfig.getInitParameter("encoding");

     }

}

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<!-- 中文编码过滤器 -->

<filter>

 <filter-name>encodingFilter</filter-name><!--过滤器的名字-->

 <filter-class>com.hdsx.gispf.filter.EncodingFilter</filter-class><!--过滤器文件所在位置-->

 <init-param>

  <param-name>encoding</param-name><!--初始参数名，指定jsp页面所用 编码集-->

  <param-value>UTF-8</param-value><!--初始参数值 ，指定中文编码集-->

 </init-param>

</filter>

<!-- 过滤器 映射路径配置 -->

<filter-mapping>

 <filter-name>encodingFilter</filter-name>

 <url-pattern>/*</url-pattern><!-- 对所有目录进行中文过滤 -->

</filter-mapping>