Content-Disposition 响应头，设置文件在浏览器打开还是下载

心已赠人 2022-05-31 07:09 202阅读 0赞

Content-Disposition 属性是作为对下载文件的一个标识字段，在rfc2616 [http://www.rfc-editor.org/rfc/rfc2616.pdf][http_www.rfc-editor.org_rfc_rfc2616.pdf] 章节19.5 Additional Features中

有介绍，具体介绍请看 [http://www.rfc-editor.org/rfc/rfc1806.txt][http_www.rfc-editor.org_rfc_rfc1806.txt]

字段介绍如下：

disposition := "Content-Disposition" ":"  
                   disposition-type  
                   *(";" disposition-parm)  
    disposition-type := "inline"  
                      / "attachment"  
                      / extension-token  
                      ; values are not case-sensitive  
    disposition-parm := filename-parm / parameter  
    filename-parm := "filename" "=" value;

Content-Disposition属性有两种类型：inline 和 attachment inline ：将文件内容直接显示在页面 attachment：弹出对话框让用户下载具体例子：

Content-Type: image/jpeg  
    Content-Disposition: inline;filename=hello.jpg  
    Content-Description: just a small picture of me

在页面内打开代码：

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

弹出保存框代码：

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

[http_www.rfc-editor.org_rfc_rfc2616.pdf]: http://www.rfc-editor.org/rfc/rfc2616.pdf
[http_www.rfc-editor.org_rfc_rfc1806.txt]: http://www.rfc-editor.org/rfc/rfc1806.txt