What to do if the java download file name is garbled

Solve the garbled file name of Java download: 1. Set the request header to specify the encoding; 2. Use URLDecoder to decode; 3. Get the original file name to avoid encoding problems; 4. Use third-party libraries (Apache Commons IO, JCodec) ;5. Contact the server to check the encoding settings.

Java download file name garbled solution

When using Java to download a file from a URL, the file name may be Garbled characters appear due to incorrect file encoding. Depending on the specific situation, there are several solutions:

1. Set the correct encoding format

<code class="java">URLConnection connection = url.openConnection();
connection.setRequestProperty("Accept-Charset", "UTF-8");</code>

By setting the Accept-Charset request header , specifies the correct character encoding for files returned by the server.

2. Use URLDecoder to decode

<code class="java">String fileName = URLEncoder.decode(response.getFileName(), "UTF-8");</code>

Use the URLDecoder.decode() function to decode the file name into UTF-8 format.

3. Get the original file name based on the HTTP header

<code class="java">String fileName = response.getHeaderField("Content-Disposition");
if (fileName != null) {
    fileName = fileName.substring(fileName.indexOf("filename=") + 9);
    fileName = fileName.substring(0, fileName.length() - 1);
}</code>

Extract the original file name from the HTTP header to avoid encoding problems.

4. Use third-party libraries

Some third-party libraries provide convenient methods to handle garbled file names, for example:

• Apache Commons IO: FileUtils.writeByteArrayToFile() The function automatically determines the file name encoding and decodes it.
• JCodec: FileGrab() The function provides the getFile() method to obtain the original file name of the downloaded file.

5. Contact the server

If the above solutions are invalid, please contact the server-side developer to check whether the server-side file encoding settings are correct.

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