我想通过spring-mvc-rest控制器返回生成的pdf文件。这是我目前正在使用的代码的缩短版本:
@RestController
@RequestMapping("/x")
public class XController {
@RequestMapping(value = "/", method = RequestMethod.GET)
public ResponseEntity<byte[]> find() throws IOException {
byte[] pdf = createPdf();
HttpHeaders headers = new HttpHeaders();
headers.setContentType(new MediaType("application", "pdf"));
headers.setContentDispositionFormData("attachment", "x.pdf");
headers.setContentLength(pdf.length);
return new ResponseEntity<byte[]>(pdf, headers, HttpStatus.OK);
}
}
这个工作得很好,它只是将实际的字节数组返回为base64编码:(
curl -i 'http://127.0.0.1:8080/app/x'
Server: Apache-Coyote/1.1
Content-Disposition: form-data; name="attachment"; filename=x.pdf"
Content-Type: application/pdf
Content-Length: 138654
Date: Fri, 08 Jan 2016 11:25:38 GMT
"JVBERi0xLjYNJeLjz9MNCjMyNCAwIG9iag [...]
(顺便说一下,答案甚至不包含结束"
:)
任何提示都赞赏!
答案 0 :(得分:4)
问题是由Spring尝试将响应编码为Json引起的。
您的请求可能指定Accepts = "*/*"
,因为Spring忽略了ResponseEntity的ContentType
,所以最好的编码是application/json
。
最简单的解决方法是在您的请求映射中添加produces
,以便您的代码变为:
@RestController
@RequestMapping(value = "/x",
produces = "application/pdf") // <-- Add this
public class XController {
@RequestMapping(value = "/", method = RequestMethod.GET)
public ResponseEntity<byte[]> find() throws IOException {
byte[] pdf = createPdf();
HttpHeaders headers = new HttpHeaders();
headers.setContentType(new MediaType("application", "pdf"));
headers.setContentDispositionFormData("attachment", "x.pdf");
headers.setContentLength(pdf.length);
return new ResponseEntity<byte[]>(pdf, headers, HttpStatus.OK);
}
}
答案 1 :(得分:2)
我使用你的代码创建了这个例子,但是一个非常类似的方法是在我的web应用程序中完成他的工作:
@RequestMapping(value = "/", method = RequestMethod.GET)
public void downloadFile(HttpServletResponse response,
HttpServletRequest request) throws IOException
{
byte[] pdf = createPdf();
response.setContentType("application/x-download");
response.setHeader("Content-Disposition", "attachment; filename=foo.pdf");
response.setHeader("Pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");
response.getOutputStream().write(pdf);
}
否则,您可以尝试这个答案Open ResponseEntity PDF in new browser tab
答案 2 :(得分:1)
这是我的代码,工作正常,也许这可以帮到你。
@RequestMapping(value = "/createReport", method = RequestMethod.POST,produces="application/pdf")
@ResponseStatus(value = HttpStatus.OK)
public ResponseEntity<byte[]> createReport(@RequestBody ReporteDTO reporteDTO) {
byte[] outputReport = null;
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.parseMediaType("application/pdf"));
headers.setContentDispositionFormData("inline", "archivo.pdf");
headers.setCacheControl("must-revalidate, post-check=0, pre-check=0");
outputReport = getFilePdf();
ResponseEntity<byte[]> response = new ResponseEntity<byte[]>(outputReport, headers, HttpStatus.OK);
return response;
}
答案 3 :(得分:0)
将产生的属性添加到RequestMapping
:
@RequestMapping(path = "/download", produces = "application/pdf")
答案 4 :(得分:0)
距离answer的Rasmus Faber非常近。
就我而言:我想查看一个由 spring 生成的 PDF。我不想下载。
但是我每次都得到 base64 编码的字符串,而不是我的 byte[]
。
我发现我只能在 Firefox 中获得 base64 字符串。所以我改用了 chrome,Rasmus 的回答在那里工作正常。
现在,它也适用于 Firefox。但我不能说为什么(我什么都没改变)。我猜有些东西被缓存了。
有关详细信息,这可能有助于Incorrect content type for PDF file with Firefox
我使用流的工作代码:
@GetMapping(path = "/demo/pdf", produces = "application/pdf")
public StreamingResponseBody getPdf(final HttpServletResponse response) {
response.setContentType("application/pdf");
response.setHeader("cache-control","must-revalidate, post-check=0, pre-check=0");
response.setHeader("Content-Disposition", "inline; filename=aCleverFileName.pdf");
return outputStream -> this.pdfService.createPdf(outputStream);
}