解决获取请求参数的乱码问题，可以使用SpringMVC提供的编码过滤器
CharacterEncodingFilter，但是必须在web.xml中进行注册
SpringMVC中处理编码的过滤器一定要配置到其他过滤器之前，否则无效
<!--配置springMVC的编码过滤器--> <filter> <filter-name>CharacterEncodingFilter</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>forceResponseEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>CharacterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
