请试试这个,内联评论:
package com.example;
import java.io.IOException;
import java.security.Principal;
import java.util.Date;
import org.apache.commons.io.IOUtils;
import org.springframework.core.io.FileSystemResource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
@Controller
public class SomeController {
@GetMapping(
value = "/get-image-with-media-type",
produces = MediaType.IMAGE_JPEG_VALUE
) // we can inject user like this (can be null, when not secured):
public ResponseEntity<byte[]> getImageWithMediaType(Principal user) throws IOException {
// XXXResource is the "spring way", FileSystem- alternatively: ClassPath-, ServletContext-, ...
FileSystemResource fsr = new FileSystemResource("/path/to/some/image.jpg");
HttpHeaders responseHeaders = new HttpHeaders();
responseHeaders.set(HttpHeaders.CONTENT_DISPOSITION,
// for direct downlad "inline", for "save as" dialog "attachment" (browser dependent)
// filename placeholders: %1$s: user id string, 2$tY: year 4 digits, 2$tm: month 2 digits, %2$td day of month 2 digits
String.format("inline; filename=\"%1$s-%2$tY-%2$tm-%2$td-image.jpg\"",
// user name, current (server) date:
user == null ? "anonymous" : user.getName(), new Date()));
// and fire:
return new ResponseEntity<>(
IOUtils.toByteArray(fsr.getInputStream()),
responseHeaders,
HttpStatus.OK
);
}
}
相关参考:
有了ContentDisposition
它可以看起来(只是)像:
responseHeaders.setContentDisposition(
ContentDisposition
.inline()// or .attachment()
.filename(// format file name:
String.format(
"%1$s-%2$tY-%2$tm-%2$td-image.jpg",
user == null ? "anonymous" : user.getName(),
new Date()
)
)
.build()
);
TYVM:使用 FileSystemResource 强制下载文件时如何设置“Content-Disposition”和“Filename”?