強迫IE用IE7的相容性檢視模式

寫個class繼承javax.servlet.Filter，在doFilter裡撰寫以下程式：

public void doFilter(ServletRequest aRequest, ServletResponse aResponse, FilterChain aChain)
        throws IOException, ServletException {
    //強迫IE用IE7的相容性檢視模式
    ((HttpServletResponse) aResponse).setHeader("X-UA-Compatible", "IE=EmulateIE7");
    aChain.doFilter(aRequest, aResponse);
}