Content-disposition中Attachment和inline的区别

java web中下载文件时,我们一般设置 Content-Disposition 告诉浏览器下载文件的名称,是否在浏览器中内嵌显示.

Content-disposition: inline; filename=foobar.pdf

表示浏览器内嵌显示一个文件

Content-disposition: attachment; filename=foobar.pdf

表示会下载文件,如火狐浏览器中



spring mvc中

@ResponseBody
@RequestMapping(value = "/download",produces="application/octet-stream")
public byte[] downloadFile(HttpServletRequest request, HttpServletResponse response,String contentType2)
throws IOException {
byte[]bytes=FileUtils.getBytes4File("D:\\Temp\\cc.jpg");
response.addHeader("Content-Disposition", "inline;filename=\"a.jpg\"");
return bytes;
}

如上代码中是内嵌显示图片呢?还是会弹框下载呢?

答案是:弹框下载

为什么呢?设置为inline应该是内嵌显示啊!

因为response content type设置成了"application/octet-stream"

注意:我们说是内嵌显示还是下载,那 一定是针对可内嵌显示的类型 ,例如"image/jpeg","image/png"等.

看下面的例子:设置response content type为" image/jpeg "

@ResponseBody
@RequestMapping(value = "/download",produces="image/jpeg")
public byte[] downloadFile(HttpServletRequest request, HttpServletResponse response,String contentType2,String downloadType)
throws IOException {
byte[]bytes=FileUtils.getBytes4File("D:\\Temp\\cc.jpg");
response.addHeader("Content-Disposition", downloadType+";filename=\"a.jpg\"");
return bytes;

}

在浏览器中访问:http://localhost:8080/tv_mobile/video/download?downloadType=inline 时就内嵌显示:



当在浏览器中访问:http://localhost:8080/tv_mobile/video/download?downloadType=attachment  时就弹框下载.

我们知道response 的content type主要有:

text/html

text/plain

application/json;charset=UTF-8

application/octet-stream

等

spring mvc中可以通过注解@RequestMapping 中的produces设置响应的类型
如:设置返回类型为json

@RequestMapping(value = "/upload",produces="application/json;charset=UTF-8")