springboot集成amazonaws实现上传下载

Spring Boot 集成 Amazon AWS 实现文件上传和下载通常涉及到使用 Amazon S3（Simple Storage Service），这是 Amazon Web Services 提供的一种云端存储服务。以下是基本步骤：

1. **设置依赖**：
- 在你的`pom.xml`或`build.gradle`文件中添加Amazon SDK for Java S3的依赖，例如：

     <dependency>
         <groupId>com.amazonaws</groupId>
         <artifactId>aws-java-sdk-s3</artifactId>
         <version>版本号</version>
     </dependency>

或者 Gradle:

     implementation 'com.amazonaws:aws-java-sdk-s3:版本号'

2. **配置AWS客户端**：
- 创建一个 `application.properties` 或 `application.yml` 文件，配置AWS访问密钥、秘密访问密钥和S3桶名：

     aws.accessKeyId=your_access_key
     aws.secretAccessKey=your_secret_key
     s3.bucketName=your_bucket_name

3. **创建Service类**：
- 创建一个 `AmazonS3Client` 的实例，并处理异常：

     @Autowired
     private AmazonS3 s3Client;

     public String uploadFileToS3(File file) {
         try {
             PutObjectRequest request = new PutObjectRequest(bucketName, file.getName(), new File(file.getAbsolutePath()));
             s3Client.putObject(request);
             return "Upload successful";
         } catch (Exception e) {
             throw new RuntimeException("Error uploading file", e);
         }
     }

     public InputStream downloadFileFromS3(String fileName) {
         try {
             S3Object object = s3Client.getObject(new GetObjectRequest(bucketName, fileName));
             return object.getObjectContent();
         } catch (Exception e) {
             throw new RuntimeException("Error downloading file", e);
         }
     }

4. **Controller接口**：
- 在控制器里，你可以提供 RESTful API 接口来上传和下载文件：

     @PostMapping("/upload")
     public ResponseEntity<?> upload(@RequestParam("file") MultipartFile file) {
         // Call the service method to upload and get the response
         String response = uploadFileToS3(file.getFile());
         return new ResponseEntity<>(response, HttpStatus.OK);
     }

     @GetMapping("/download/{fileName}")
     public ResponseEntity<InputStreamResource> downloadFile(@PathVariable String fileName) {
         InputStream inputStream = downloadFileFromS3(fileName);
         HttpHeaders headers = new HttpHeaders();
         headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
         return new ResponseEntity<>(new InputStreamResource(inputStream), headers, HttpStatus.OK);
     }