springboot调用接口获取下载地址并下载ofd文件

以下是一个简单的Spring Boot示例，调用接口获取下载地址并下载OFD文件：

1. 创建一个Spring Boot项目，并添加以下依赖：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
   <groupId>org.apache.httpcomponents</groupId>
   <artifactId>httpclient</artifactId>
</dependency>

2. 在`application.properties`中添加接口地址：

api.url=http://example.com/api/download

3. 创建一个`DownloadService`类，用于调用接口并下载OFD文件：

@Service
public class DownloadService {
    @Value("${api.url}")
    private String apiUrl;

    public void download(String fileId, String filePath) throws IOException {
        HttpClient httpClient = HttpClientBuilder.create().build();
        HttpPost httpPost = new HttpPost(apiUrl);

        // 设置请求参数
        List<NameValuePair> params = new ArrayList<>();
        params.add(new BasicNameValuePair("fileId", fileId));
        httpPost.setEntity(new UrlEncodedFormEntity(params));

        // 发送请求
        HttpResponse response = httpClient.execute(httpPost);

        // 下载文件
        HttpEntity entity = response.getEntity();
        if (entity != null) {
            BufferedInputStream bis = new BufferedInputStream(entity.getContent());
            FileOutputStream fos = new FileOutputStream(filePath);

            int inByte;
            while ((inByte = bis.read()) != -1) {
                fos.write(inByte);
            }

            bis.close();
            fos.close();
        }
    }
}

4. 创建一个`DownloadController`类，用于接收请求并调用`DownloadService`：

@RestController
@RequestMapping("/download")
public class DownloadController {
    @Autowired
    private DownloadService downloadService;

    @GetMapping("/{fileId}")
    public ResponseEntity<?> download(@PathVariable("fileId") String fileId) {
        try {
            String filePath = "download/" + fileId + ".ofd";
            downloadService.download(fileId, filePath);
            File file = new File(filePath);
            InputStreamResource resource = new InputStreamResource(new FileInputStream(file));

            HttpHeaders headers = new HttpHeaders();
            headers.add("Content-Disposition", String.format("attachment; filename=\"%s\"", file.getName()));
            headers.add("Cache-Control", "no-cache, no-store, must-revalidate");
            headers.add("Pragma", "no-cache");
            headers.add("Expires", "0");

            return ResponseEntity.ok()
                    .headers(headers)
                    .contentLength(file.length())
                    .contentType(MediaType.parseMediaType("application/octet-stream"))
                    .body(resource);
        } catch (Exception e) {
            return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(new ErrorResponse(e.getMessage()));
        }
    }
}

5. 运行项目并访问`http://localhost:8080/download/{fileId}`即可下载OFD文件。