我正在尝试从 Spring Boot Rest 服务下载文件。
@RequestMapping(path="/downloadFile",method=RequestMethod.GET)
@Consumes(MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<InputStreamReader> downloadDocument(
String acquistionId,
String fileType,
Integer expressVfId) throws IOException {
File file2Upload = new File("C:\\Users\\admin\\Desktop\\bkp\\1.rtf");
HttpHeaders headers = new HttpHeaders();
headers.add("Cache-Control", "no-cache, no-store, must-revalidate");
headers.add("Pragma", "no-cache");
headers.add("Expires", "0");
InputStreamReader i = new InputStreamReader(new FileInputStream(file2Upload));
System.out.println("The length of the file is : "+file2Upload.length());
return ResponseEntity.ok().headers(headers).contentLength(file2Upload.length())
.contentType(MediaType.parseMediaType("application/octet-stream"))
.body(i);
}
当我尝试从浏览器下载文件时,它会开始下载,但总是失败。导致下载失败的服务有什么问题吗?
最佳答案
选项 1 使用 InputStreamResource
Resource implementation for a given InputStream.
Should only be used if no other specific Resource implementation is > applicable. In particular, prefer ByteArrayResource or any of the file-based Resource implementations where possible.
@RequestMapping(path = "/download", method = RequestMethod.GET)
public ResponseEntity<Resource> download(String param) throws IOException {
// ...
InputStreamResource resource = new InputStreamResource(new FileInputStream(file));
return ResponseEntity.ok()
.headers(headers)
.contentLength(file.length())
.contentType(MediaType.APPLICATION_OCTET_STREAM)
.body(resource);
}
Option2 正如 InputStreamResource 的文档所建议的那样 - 使用 ByteArrayResource :
@RequestMapping(path = "/download", method = RequestMethod.GET)
public ResponseEntity<Resource> download(String param) throws IOException {
// ...
Path path = Paths.get(file.getAbsolutePath());
ByteArrayResource resource = new ByteArrayResource(Files.readAllBytes(path));
return ResponseEntity.ok()
.headers(headers)
.contentLength(file.length())
.contentType(MediaType.APPLICATION_OCTET_STREAM)
.body(resource);
}
关于java - 从 Spring Boot Rest 服务下载文件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35680932/