struts过滤器 中文乱码及上传乱码

package com.math.util.filter;
import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;


public class UpFilter implements Filter {
    
    private String charset;

    public void destroy() {
        // TODO Auto-generated method stub

    }

    public void doFilter(ServletRequest req, ServletResponse res,
            FilterChain chain) throws IOException, ServletException {
        // TODO Auto-generated method stub
        /**//*设置request的字符编码*/
        req.setCharacterEncoding(charset);
        /**//*将request和response传回去,具体为什么请参考jsp基础*/
        chain.doFilter(req, res);
    }

    public void init(FilterConfig config) throws ServletException {
        // TODO Auto-generated method stub
        /**//*获取xml文件中初始化参数charset对应web.xml文件中的<param-name>charset</param-name>将值传给属性charset*/
        charset = config.getInitParameter("charset");
    }

}

在web.xml中设置

<filter>
   <filter-name>upEncoding</filter-name>
   <filter-class>com.math.util.filter.UpFilter</filter-class>
   <init-param>
    <param-name>charset</param-name>
    <param-value>utf-8</param-value>
   </init-param>
</filter>
<filter-mapping>
   <filter-name>upEncoding</filter-name>
   <url-pattern>/*</url-pattern>
</filter-mapping>