Spring的编码过滤器CharacterEncodingFilter

在web.xml文件中设置如下过滤器代码：

  <!-- Filter定义 -->  <!-- Character Encoding filter -->  <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>

该设置可以解决HttpServletRequest和HttpServletResponse的中文编码不匹配的问题。
其中两个参数:
encoding，指定中文编码；
forceEncoding，默认为false，即只设置request的编码request.setCharacterEncoding(this.encoding);,设置为true，会强制设置response的编码格式response.setCharacterEncoding(this.encoding);