web項目下載TXT文件防止瀏覽器直接打開

只須要在web.xml中設置以下內容：

<mime-mapping>
	<extension>txt</extension>
	<mime-type>application/msword</mime-type>
 </mime-mapping>

若是不行，就用下面這：

<mime-mapping>
		<extension>txt</extension>
		<mime-type>application/plain</mime-type>
 	</mime-mapping>