springboot 和 HttpServletResponse下载多文件方法
@GetMapping("/download-multiple-files")
public void downloadMultipleFiles(HttpServletResponse response) throws IOException {
// Set the content type and header for the response
response.setContentType("application/zip");
response.setHeader("Content-Disposition", "attachment; filename=files.zip");
// Create a ZipOutputStream to write the files to the response output stream
try (ZipOutputStream zipOut = new ZipOutputStream(response.getOutputStream())) {
// Add file1.txt to the zip file
zipOut.putNextEntry(new ZipEntry("file1.txt"));
Files.copy(Paths.get("file1.txt"), zipOut);
zipOut.closeEntry();
// Add file2.txt to the zip file
zipOut.putNextEntry(new ZipEntry("file2.txt"));
Files.copy(Paths.get("file2.txt"), zipOut);
zipOut.closeEntry();
}
// Flush and close the response output stream
response.flushBuffer();
}
public static void compressStreamsToZip(List
// Create a new ZipOutputStream to write the compressed data to the zip file
try (ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(zipFileName))) {
// Loop through each output stream and add it to the zip file
for (int i = 0; i < outputStreams.size(); i++) {
// Get the current output stream and create a new ZipEntry for it
OutputStream outputStream = outputStreams.get(i);
String entryName = "file" + (i + 1) + ".txt";
zipOut.putNextEntry(new ZipEntry(entryName));
// Write the contents of the output stream to the zip file
ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int length;
while ((length = outputStream.read(buffer)) > 0) {
byteOut.write(buffer, 0, length);
}
zipOut.write(byteOut.toByteArray());
// Close the current ZipEntry and output stream
zipOut.closeEntry();
outputStream.close();
}
}
}
public static void compressFilesToZip(List
// Create a new ZipOutputStream to write the compressed data to the zip file
try (ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(zipFileName))) {
// Loop through each input stream and add it to the zip file
for (int i = 0; i < inputStreams.size(); i++) {
// Get the current input stream and create a new ZipEntry for it
InputStream inputStream = inputStreams.get(i);
String entryName = "file" + (i + 1) + ".txt";
zipOut.putNextEntry(new ZipEntry(entryName));
// Write the contents of the input stream to the zip file
byte[] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) > 0) {
zipOut.write(buffer, 0, length);
}
// Close the current ZipEntry and input stream
zipOut.closeEntry();
inputStream.close();
}
}
}
public static void compressStreamsToZip(List
// Create a new ZipOutputStream to write the compressed data to the zip file
try (ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(zipFileName))) {
// Loop through each output stream and add it to the zip file
for (int i = 0; i < outputStreams.size(); i++) {
// Get the current output stream and create a new ZipEntry for it
OutputStream outputStream = outputStreams.get(i);
String entryName = "file" + (i + 1) + ".txt";
zipOut.putNextEntry(new ZipEntry(entryName));
// Write the contents of the output stream to the zip file
ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int length;
while ((length = outputStream.read(buffer)) > 0) {
byteOut.write(buffer, 0, length);
}
zipOut.write(byteOut.toByteArray());
// Close the current ZipEntry and output stream
zipOut.closeEntry();
outputStream.close();
}
}
}
@GetMapping("/download-multiple-files")
public void downloadMultipleFiles(HttpServletResponse response) throws IOException {
// Set the content type and header for the response
response.setContentType("application/zip");
response.setHeader("Content-Disposition", "attachment; filename=files.zip");
// Create a ZipOutputStream to write the files to the response output stream
try (ZipOutputStream zipOut = new ZipOutputStream(response.getOutputStream())) {
// Add file1.txt to the zip file
zipOut.putNextEntry(new ZipEntry("file1.txt"));
Files.copy(Paths.get("file1.txt"), zipOut);
zipOut.closeEntry();
// Add file2.txt to the zip file
zipOut.putNextEntry(new ZipEntry("file2.txt"));
Files.copy(Paths.get("file2.txt"), zipOut);
zipOut.closeEntry();
}
// Flush and close the response output stream
response.flushBuffer();
}
@RequestMapping("/downloadMultipleFiles")
public void downloadMultipleFiles(HttpServletResponse response, @RequestParam("fileNames") List
response.setContentType("application/octet-stream");
response.setBufferSize(8192);
for (String fileName : fileNames) {
File file = new File(fileName);
InputStream inputStream = new FileInputStream(file);
response.setHeader("Content-Disposition", "attachment; filename=\"" + file.getName() + "\"");
IOUtils.copy(inputStream, response.getOutputStream());
response.flushBuffer();
inputStream.close();
}
}
@GetMapping("/download")
public ResponseEntity
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
headers.set("Content-Disposition", "attachment; filename=\"files.zip\"");
StreamingResponseBody responseBody = outputStream -> {
ZipOutputStream zipOutputStream = new ZipOutputStream(outputStream);
ZipEntry zipEntry = new ZipEntry("file1.pdf");
zipOutputStream.putNextEntry(zipEntry);
Resource resource = new ClassPathResource("file1.pdf");
File file = resource.getFile();
FileInputStream fileInputStream = new FileInputStream(file);
byte[] bytes = new byte[1024];
int length;
while ((length = fileInputStream.read(bytes)) >= 0) {
zipOutputStream.write(bytes, 0, length);
}
fileInputStream.close();
zipOutputStream.closeEntry();
zipEntry = new ZipEntry("file2.pdf");
zipOutputStream.putNextEntry(zipEntry);
resource = new ClassPathResource("file2.pdf");
file = resource.getFile();
fileInputStream = new FileInputStream(file);
while ((length = fileInputStream.read(bytes)) >= 0) {
zipOutputStream.write(bytes, 0, length);
}
fileInputStream.close();
zipOutputStream.closeEntry();
zipOutputStream.finish();
};
return new ResponseEntity<>(responseBody, headers, HttpStatus.OK);
}
@GetMapping("/download-files")
public ResponseEntity
// Read file1.txt and file2.txt into byte arrays
byte[] file1Content = Files.readAllBytes(Paths.get("file1.txt"));
byte[] file2Content = Files.readAllBytes(Paths.get("file2.txt"));
// Create a MultiValueMap to hold the response headers
MultiValueMap
headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=file1.txt");
headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=file2.txt");
// Combine the file contents into a single byte array
byte[] combinedContents = new byte[file1Content.length + file2Content.length];
System.arraycopy(file1Content, 0, combinedContents, 0, file1Content.length);
System.arraycopy(file2Content, 0, combinedContents, file1Content.length, file2Content.length);
// Create a ByteArrayResource with the combined contents
ByteArrayResource resource = new ByteArrayResource(combinedContents);
// Return a ResponseEntity with the resource, headers, and status code
return ResponseEntity.ok()
.headers(headers)
.contentType(MediaType.APPLICATION_OCTET_STREAM)
.contentLength(combinedContents.length)
.body(resource);
}