javaweb 自定义文件分片上传 oss文件服务器
时间: 2023-08-21 19:01:53 浏览: 83
对于JavaWeb应用程序,您可以使用OSS SDK提供的Multipart Upload API来实现文件分片上传到OSS文件服务器。下面是一个简单的示例代码,演示如何使用Java SDK实现文件分片上传到OSS。
```java
public class OSSFileUploader {
// 阿里云OSS的Access Key ID和Access Key Secret
private static final String ACCESS_KEY_ID = "<your_access_key_id>";
private static final String ACCESS_KEY_SECRET = "<your_access_key_secret>";
// 阿里云OSS的Endpoint
private static final String ENDPOINT = "<your_endpoint>";
// 阿里云OSS的Bucket名称
private static final String BUCKET_NAME = "<your_bucket_name>";
// 阿里云OSS的Object名称(即上传到OSS后的文件名)
private static final String OBJECT_NAME = "<your_object_name>";
// 每个分片的大小(单位:字节)
private static final int PART_SIZE = 1024 * 1024;
// 初始化OSSClient对象
private static final OSSClient client = new OSSClient(ENDPOINT, ACCESS_KEY_ID, ACCESS_KEY_SECRET);
/**
* 将指定文件上传到阿里云OSS
*
* @param filePath 要上传的文件路径
*/
public static void upload(String filePath) throws Exception {
// 初始化一个MultipartUpload请求
InitiateMultipartUploadResult initResult = client.initiateMultipartUpload(BUCKET_NAME, OBJECT_NAME);
// 获取Upload ID,用于后续的分片上传
String uploadId = initResult.getUploadId();
// 计算文件分片数量
File file = new File(filePath);
long fileSize = file.length();
int partCount = (int) Math.ceil((double) fileSize / PART_SIZE);
// 将文件分成多个分片上传
List<PartETag> partETags = new ArrayList<PartETag>();
for (int i = 0; i < partCount; i++) {
// 计算分片的起始位置和长度
long startPos = i * PART_SIZE;
long partSize = Math.min(PART_SIZE, fileSize - startPos);
// 读取分片数据
RandomAccessFile raf = new RandomAccessFile(file, "r");
raf.seek(startPos);
byte[] partData = new byte[(int) partSize];
raf.read(partData);
raf.close();
// 上传分片数据
UploadPartRequest uploadRequest = new UploadPartRequest();
uploadRequest.setBucketName(BUCKET_NAME);
uploadRequest.setKey(OBJECT_NAME);
uploadRequest.setUploadId(uploadId);
uploadRequest.setPartNumber(i + 1);
uploadRequest.setInputStream(new ByteArrayInputStream(partData));
uploadRequest.setPartSize(partSize);
UploadPartResult uploadResult = client.uploadPart(uploadRequest);
// 获取分片的ETag,并保存到列表中
partETags.add(uploadResult.getPartETag());
}
// 完成上传操作
CompleteMultipartUploadRequest completeRequest = new CompleteMultipartUploadRequest(BUCKET_NAME, OBJECT_NAME, uploadId, partETags);
client.completeMultipartUpload(completeRequest);
}
}
```
在上述示例代码中,`upload()`方法接受要上传的文件路径,并将文件分成多个分片进行上传,最终完成整个上传操作。需要注意的是,每个分片的大小可以根据具体情况进行调整。另外,您需要将代码中的ACCESS_KEY_ID、ACCESS_KEY_SECRET、ENDPOINT、BUCKET_NAME和OBJECT_NAME替换成您自己的阿里云OSS相关信息。