Java oss分片上传 返回文件链接

在Java中进行OSS分片上传，可以通过以下步骤返回文件链接：

1. 创建OSSClient对象，连接到OSS服务。例如：

   String endpoint = "<yourEndpoint>";
   String accessKeyId = "<yourAccessKeyId>";
   String accessKeySecret = "<yourAccessKeySecret>";
   String bucketName = "<yourBucketName>";
   
   OSSClient ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);

2. 初始化分片上传，并获取UploadId。例如：

   InitiateMultipartUploadRequest request = new InitiateMultipartUploadRequest(bucketName, key);
   InitiateMultipartUploadResult result = ossClient.initiateMultipartUpload(request);
   String uploadId = result.getUploadId();

3. 上传分片。可以使用UploadPartRequest对象上传每个分片，并记录每个分片的ETag和PartNumber。例如：

    FileInputStream inputStream = new FileInputStream(file);
    long partSize = 5 * 1024 * 1024L;
    long fileLength = file.length();
    int partCount = (int) (fileLength / partSize);
    if (fileLength % partSize != 0) {
        partCount++;
    }
    List<PartETag> partETags = new ArrayList<PartETag>();
    for (int i = 0; i < partCount; i++) {
        long startPos = i * partSize;
        long curPartSize = (i + 1 == partCount) ? fileLength - startPos : partSize;
        inputStream.skip(startPos);
        UploadPartRequest uploadPartRequest = new UploadPartRequest();
        uploadPartRequest.setBucketName(bucketName);
        uploadPartRequest.setKey(key);
        uploadPartRequest.setUploadId(uploadId);
        uploadPartRequest.setInputStream(inputStream);
        uploadPartRequest.setPartSize(curPartSize);
        uploadPartRequest.setPartNumber(i + 1);
        UploadPartResult uploadPartResult = ossClient.uploadPart(uploadPartRequest);
        partETags.add(uploadPartResult.getPartETag());
    }

4. 完成分片上传。可以使用CompleteMultipartUploadRequest对象完成分片上传，并获取文件链接。例如：

   CompleteMultipartUploadRequest completeRequest = new CompleteMultipartUploadRequest(bucketName, key, uploadId, partETags);
   CompleteMultipartUploadResult completeResult = ossClient.completeMultipartUpload(completeRequest);
   String fileUrl = completeResult.getLocation();

fileUrl即为上传文件的链接。