springboot实现大文件上传

在Spring Boot中实现大文件上传可以使用MultipartFile和MultipartResolver。MultipartFile是Spring提供的一个接口，用于处理上传的文件，而MultipartResolver则是用于解析上传的请求的。以下是一个简单的示例：

@PostMapping("/upload")
public String upload(@RequestParam("file") MultipartFile file) {
    // 处理上传的文件
    return "上传成功";
}

如果要实现分片上传，可以使用OSS的multipartUpload接口。具体步骤如下：

1. 初始化OSSClient对象

OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);

2. 初始化InitiateMultipartUploadRequest对象

InitiateMultipartUploadRequest request = new InitiateMultipartUploadRequest(bucketName, objectName);

3. 调用initiateMultipartUpload方法初始化分片上传

InitiateMultipartUploadResult result = ossClient.initiateMultipartUpload(request);

4. 上传分片

UploadPartRequest uploadPartRequest = new UploadPartRequest();
uploadPartRequest.setBucketName(bucketName);
uploadPartRequest.setKey(objectName);
uploadPartRequest.setUploadId(result.getUploadId());
uploadPartRequest.setPartNumber(partNumber);
uploadPartRequest.setInputStream(inputStream);
uploadPartRequest.setPartSize(partSize);
UploadPartResult uploadPartResult = ossClient.uploadPart(uploadPartRequest);

5. 完成分片上传

CompleteMultipartUploadRequest completeMultipartUploadRequest = new CompleteMultipartUploadRequest(bucketName, objectName, result.getUploadId(), partETags);
ossClient.completeMultipartUpload(completeMultipartUploadRequest);