Java 如何在 Content-Disposition 标头中设置包含空格的文件名
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How to set filename containing spaces in Content-Disposition header
提问by Huy Than
I have this piece of code:
我有这段代码：
resp.addHeader("Content-Disposition", "inline; filename=" + fileName);
When the file name is "a_b_c.doc" or "abc.doc" the name of the downloaded file is displayed correctly. However, when the file name is "a b c .doc" the name of the downloaded file is only "a".
当文件名为“a_b_c.doc”或“abc.doc”时，正确显示下载文件的名称。但是，当文件名为“abc .doc”时，下载文件的名称仅为“a”。
How can we solve this?
我们如何解决这个问题？
回答by Moritz Petersen
Use quotes:
使用引号：
resp.addHeader("Content-Disposition", "inline; filename=\"" + fileName + "\"");
回答by Rapha?l
if you quote your filename with chr(34)it will work:
如果你引用你的文件名，chr(34)它将起作用：
resp.addHeader("Content-Disposition", "inline; filename=" + chr(34) + fileName + chr(34));
回答by Malvineous
According to the HTTP standardyou surround the string with double-quotes, and escape any quotes or backslashes within by preceding them with a single backslash.
根据HTTP 标准，您用双引号将字符串括起来，并通过在它们前面加上一个反斜杠来转义其中的任何引号或反斜杠。
Content-Disposition: attachment; filename="Very \"interesting\" file \ files.txt"
This will prompt to save as Very "interesting" file \ files.txt. Note that the presence of a backslash does not suggest a folder, it suggests the backslash is part of the filename (which is perfectly valid on Linux and some other platforms, but not on Windows.)
这将提示另存为Very "interesting" file \ files.txt. 请注意，反斜杠的存在并不表示文件夹，它表明反斜杠是文件名的一部分（这在 Linux 和其他一些平台上完全有效，但在 Windows 上无效。）
回答by Peter Walser
Following steps are required:
需要以下步骤：
- URI-encodethe filename
- Replace the spacesin the encoded filename (we're using an URL encoder instead of URI encoder, but URL encoding uses
+as encoded space instead of%20, so we need to manually replace them with%20). - Set the encoded file name in the header. Here we have two variants: one which specifices the encoding, and one that doesn't. For maximal compatibility we can specify both.
- URI 编码文件名
- 替换编码文件名中的空格（我们使用的是 URL 编码器而不是 URI 编码器，但 URL 编码使用的
+是编码空间而不是%20，因此我们需要手动将它们替换为%20）。 - 在 header 中设置编码的文件名。这里我们有两种变体：一种指定编码，一种不指定。为了最大的兼容性，我们可以同时指定两者。
Code:
代码：
String fileName = ...;
String encodedFileName = URLEncoder.encode(fileName,
StandardCharsets.UTF_8.name()).replace("+", "%20");
response.setHeader("Content-Disposition",
String.format("inline; filename*=UTF-8''%1$s; filename=%1$s", encodedFileName));
Example header:
inline; filename*=UTF-8''Hello%20World.doc; filename=Hello%20World.doc
示例标题：
inline; filename*=UTF-8''Hello%20World.doc; filename=Hello%20World.doc
Successfully tested with
成功测试
- Firefox ?
- Chrome ?
- Edge ?
- Internet Explorer ?
- 火狐？
- 铬合金 ？
- 边缘 ？
- IE浏览器 ？
