解决获取请求参数乱码的问题

解决获取请求参数乱码的问题：

在web.xml中配置spring编码过滤器CharacterEncodingFilter
注意：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Spring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>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/</url-pattern>
    </filter-mapping>