在三大框架spring中有专门的一个过滤器类用于处理乱码问题--->CharacterEncodingFilter

我们只需在web.xml中添加如下几行代码就可解决乱码问题

<filter>
  <filter-name>encoding</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>
</filter>
<filter-mapping>
  <filter-name>encoding</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>