UTF8过滤

利用Spring框架，在web.xml文件配置：

     < filter >
         < filter-name > encodingFilter </ filter-name >
         < filter-class >
            org.springframework.web.filter.CharacterEncodingFilter
         </ filter-class >
         < init-param >
             < param-name > encoding </ param-name >
             < param-value > UTF-8 </ param-value >
         </ init-param >
         < init-param >
             < param-name > forceEncoding </ param-name >
             < param-value > true </ param-value >
         </ init-param >
     </ filter >
     < filter-mapping >
         < filter-name > encodingFilter </ filter-name >
         < url-pattern > /* </ url-pattern >
     </ filter-mapping >