这个中文乱码怎么回事？

我用Filter来解决中文乱码问题，以前也用过，但这次不知道哪里出了问题，一直解决不了乱码问题。大家帮忙看下：xml文件：<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
        http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <!--Spring -->
 <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext*.xml</param-value>
    </context-param>    <filter>
        <filter-name>springSecurityFilterChain</filter-name>
        <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>springSecurityFilterChain</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    
    <!-- 乱码问题 Filter -->
<filter>
   <filter-name>Set Character Encoding</filter-name>
   <filter-class>com.common.SetCharacterEncodingFilter</filter-class>
   <init-param>  
            <param-name>encoding</param-name>  
            <param-value>UTF-8</param-value>  
        </init-param>  
        <init-param>  
            <param-name>enable</param-name>  
            <param-value>true</param-value>  
       </init-param>  
</filter>
   <filter-mapping>
   <filter-name>Set Character Encoding</filter-name>
   <url-pattern>/*</url-pattern>
</filter-mapping>
    
    <!-- 定义struts2的核心控制器：FilterDispatcher -->
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.FilterDispatcher
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
    <welcome-file-list>
<welcome-file>
index.jsp
</welcome-file>
</welcome-file-list>

</web-app>
我的Filter：public class SetCharacterEncodingFilter implements Filter {
protected String sEncodingName;    
   
    protected FilterConfig sysFilter;    
   
    protected boolean bEnable;    
   
  //  protected Log logger = LogFactory.getLog(SysFilter.class);    
   
    public void destroy() {    
   
    }    
   
    public void doFilter(ServletRequest arg0, ServletResponse arg1,    
            FilterChain arg2) throws IOException, ServletException {    
        // TODO Auto-generated method stub    
        if (this.bEnable) {    
            try {      
                arg0.setCharacterEncoding(this.sEncodingName);    
                arg1.setContentType("text/html;charset=" + this.sEncodingName);    
                arg1.setCharacterEncoding(this.sEncodingName);    
                arg2.doFilter(arg0, arg1);    
   
            } catch (Exception e) {    
              //  logger.info("�����");    
            }    
            // session.close();    
        } else {    
            arg2.doFilter(arg0, arg1);    
        }    
    }        
    public void init(FilterConfig arg0) throws ServletException {    
        // TODO Auto-generated method stub    
        this.sysFilter = arg0;    
        this.loadFilterSetting();    
    }    
   
    private void loadFilterSetting() {    
        this.sEncodingName = this.sysFilter.getInitParameter("encoding");    
       // logger.info("encoding:" + sEncodingName);    
        String sEnable = this.sysFilter.getInitParameter("enable");    
        if (sEnable != null && sEnable.equalsIgnoreCase("true")) {    
            this.bEnable = true;    
        } else {    
            this.bEnable = false;    
        }    
    }    
}
另：我的JSP上都用了UTF-8格式，我的项目整个编码也是UTF-8，我的数据库用的是Mysql,utf-8。DEBUG，肯定进了这个Filter，
我在Action里跟踪，上传的中文就已经是乱码了。