有時我們希望在后臺實時生成文件并下載到客戶端

@GetMapping(value = "download")

public void download(HttpServletResponse response) {

try(OutputStream outputStream = response.getOutputStream();

ZipOutputStream zipOutputStream = new ZipOutputStream(outputStream, StandardCharsets.UTF_8)

) {

response.setContentType("application/octet-stream");

response.setHeader("Content-Disposition", "attachment; filename=" + new String("壓縮文件.zip".getBytes("UTF-8"), "ISO-8859-1"));

File[] files = new File("").listFiles();

for (File file : files) {

// 單個文件壓縮

compress(zipOutputStream, new FileInputStream(file), file.getName());

}

zipOutputStream.flush();

} catch (IOException e) {

}

}

/**

* 單個文件壓縮

*

* @param zipOutputStream

* @param inputStream

* @param fileName

* @throws IOException

*/

private static void compress(ZipOutputStream zipOutputStream, InputStream inputStream, String fileName) throws IOException {

if (inputStream == null) return;

zipOutputStream.putNextEntry(new ZipEntry(fileName));

int bytesRead;

byte[] buffer = new byte[FileUtil.BUFFER_SIZE];

while ((bytesRead = inputStream.read(buffer)) != -1) {

zipOutputStream.write(buffer, 0, bytesRead);

}

zipOutputStream.closeEntry();

inputStream.close();

}

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