springboot 返回文件流

在 Spring Boot 中返回文件流，可以使用 ResponseEntity 类。例如，你可以这样做：

@RestController
public class SpeechHandlerController {

    @Autowired
    private SpeechHandlerBiz speechHandlerBiz;

    @PostMapping(value = {"/api/v1/ali/tts", "/openapi/v1/ali/tts"})
    public ResponseEntity<InputStreamResource> textToSpeech(@RequestBody TtsRequest ttsRequest) throws FileNotFoundException {
        File file = speechHandlerBiz.textToSpeech(ttsRequest);
        InputStreamResource resource = new InputStreamResource(new FileInputStream(file));
        return ResponseEntity.ok()
                .header(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=" + file.getName())
                .contentType(MediaType.APPLICATION_OCTET_STREAM)
                .contentLength(file.length())
                .body(resource);
    }

}

这段代码会返回一个带有文件内容的响应，浏览器会将其作为文件下载。你也可以根据需要自定义响应头，例如设置文件名称、内容类型等

调用方接收流–使用Spring中的RestTemplate

方式一：postForEntity
RestTemplate restTemplate = new RestTemplate();
ResponseEntity<Resource> entity = restTemplate.postForEntity(url, paramObject, Resource.class);
InputStream in = entity.getBody().getInputStream();

方式二：exchange
// resource 接受流
ResponseEntity<Resource> responseEntity = restTemplate.exchange(url,
        HttpMethod.POST, HttpEntity.EMPTY, Resource.class, new Object[0]);
// 直接根据resource获取流，进行文件操作
try(InputStream inputStream = responseEntity.getBody().getInputStream()) {
       PDDocument load = PDDocument.load(inputStream);
       PDFTextStripper pdfTextStripper = new PDFTextStripper();
       String text = pdfTextStripper.getText(load);
} catch (IOException e) {
       e.printStackTrace();
}