Content-Disposition 響應頭，設置文件在瀏覽器打開還是下載(pdf文件在瀏覽器預覽功能)圖片預覽功能瀏覽器下載功能

Content-Disposition 屬性是作為對下載文件的一個標識字段，在rfc2616 http://www.rfc-editor.org/rfc/rfc2616.pdf 章節19.5 Additional Features中

有介紹，具體介紹請看 http://www.rfc-editor.org/rfc/rfc1806.txt

字段介紹如下：

1.  
    
2.  
   disposition := "Content-Disposition" ":"
3.  
   disposition- type
4.  
   *( ";" disposition-parm)
5.  
   disposition- type := "inline"
6.  
   / "attachment"
7.  
   / extension-token
8.  
   ; values are not case-sensitive
9.  
   disposition-parm := filename-parm / parameter
10.  
    filename-parm := "filename" "=" value;

Content-Disposition屬性有兩種類型：inline 和 attachment

inline ：將文件內容直接顯示在頁面

1.  
   File file = new File("rfc1806.txt");
2.  
   String filename = file.getName();
3.  
   response.setHeader( "Content-Type","text/plain");
4.  
   response.addHeader( "Content-Disposition","inline;filename=" + new String(filename.getBytes(),"utf-8"));
5.  
   response.addHeader( "Content-Length","" + file.length());

attachment：彈出對話框讓用戶下載

1.  
   File file = new File("rfc1806.txt");
2.  
   String filename = file.getName();
3.  
   response.setHeader( "Content-Type","text/plain");
4.  
   response.addHeader( "Content-Disposition","attachment;filename=" + new String(filename.getBytes(),"utf-8"));
5.  
   response.addHeader( "Content-Length","" + file.length());