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>

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