我正在開發一個Web API（使用彈簧啟動），使用外部C++api轉換pdf，該程序正在工作，但是當我想在正文響應中發送文件時，我收到此錯誤：{"timestamp": "2019-04-10T09:56:01.696+0000","status": 500,"error": "Internal Server Error","message": "file [D:\\[Phenix-Monitor]1.pdf] cannot be resolved in the file system for checking its content length","path": "/convert/toLinPDf"}控制器：@PostMapping("/toLinPDf")public ResponseEntity<ByteArrayResource> convertion(@RequestParam(value = "input", required = false) String in, @RequestParam(value = "output", required = false) String out) throws IOException, InterruptedException { linearizeService.LinearizePDf(in, out); FileSystemResource pdfFile = new FileSystemResource(out); return ResponseEntity .ok() .contentLength(pdfFile.contentLength()) .contentType( MediaType.parseMediaType("application/pdf")) .body(new ByteArrayResource(IOUtils.toByteArray(pdfFile.getInputStream())));}我想問題在于，因為在這種方法中我使用的是外部進程，所以發生的事情是，當我嘗試打開文件時，linearizeService尚未完成處理，為什么我得到這個錯誤，我的問題是：我該如何處理這個問題，我的意思是如何等待文件被創建然后發送這個文件？linearizeService.LinearizePDf(in, out);FileSystemResource pdfFile = new FileSystemResource(out);
1 回答
幕布斯6054654
TA貢獻1876條經驗 獲得超7個贊
我建議你使用Java 8。Future API
這是您的資源的更新。
@PostMapping("/toLinPDf")
public ResponseEntity<ByteArrayResource> convertion(
@RequestParam(value = "input", required = false) String in,
@RequestParam(value = "output", required = false) String out) throws IOException, InterruptedException {
ExecutorService executorService = Executors.newSingleThreadExecutor();
Callable<String> callable = () -> {
linearizeService.LinearizePDf(in, out);
return "Task ended";
};
Future<String> future = executorService.submit(callable);
String result = future.get();
executorService.shutdown();
FileSystemResource pdfFile = new FileSystemResource(out);
return ResponseEntity
.ok()
.contentLength(pdfFile.contentLength())
.contentType(
MediaType.parseMediaType("application/pdf"))
.body(new ByteArrayResource(IOUtils.toByteArray(pdfFile.getInputStream())));
}
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