springmvc接收get请求的参数不一定会乱码

tomcat 8.xx 之前 编码默认是iso 之后 编码默认是utf-8

springmvc接收post请求没有编码规定所以会乱码

    编写web.xml   添加CharacterEncodingFilter

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