한글 깨짐 처리를 위한 한글 필터

web.xml에 추가

<!-- Korean Filter -->
<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>
    <servlet-name>appServlet</servlet-name>
</filter-mapping>