Web Filter for Encoding－Jemmy Walker

　　目前研究進度是可以回傳JSON格式在DataTables.js正常顯示，但中文卻成了亂碼。UTF8已是通用的頁面編碼，過去得自撰Filter對response進行編碼，現在Spring提供了Filter，解決了亂碼問題，在web.xml設定如下：

<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>