华为obs对象存储，深入浅出华为OBS对象存储Java API，从入门到实践

华为OBS对象存储Java API教程，涵盖从基础到实战，全面解析华为对象存储服务，助您快速掌握Java环境下OBS的接入、操作与优化。

随着互联网技术的飞速发展，数据存储需求日益增长，华为云对象存储服务（OBS）凭借其高性能、高可靠、低成本的特点，成为企业级应用的首选，本文将详细介绍华为OBS对象存储Java API，帮助读者快速上手，并实现相关操作。

华为OBS对象存储简介

华为云对象存储服务（OBS）是一种分布式存储服务，提供海量、安全、低成本的数据存储解决方案，OBS支持多种访问方式，包括API、SDK、命令行工具等，本文主要介绍Java SDK的使用。

准备工作

1、注册华为云账号：登录华为云官网（https://www.huaweicloud.com/），注册并创建账号。

2、创建项目和应用：在华为云控制台创建项目和应用，获取应用的Access Key ID和Access Key Secret。

3、安装Java SDK：下载华为云Java SDK，解压并配置环境变量。

Java SDK基本使用

1、初始化OBS客户端

String endpoint = "https://obs.cn-north-4.myhuaweicloud.com"; // OBS服务域名
String accessKeyId = "yourAccessKeyId"; // 应用Access Key ID
String accessKeySecret = "yourAccessKeySecret"; // 应用Access Key Secret
String bucketName = "yourBucketName"; // 存储桶名称
OBSClient obsClient = new OBSClient(endpoint, accessKeyId, accessKeySecret);

2、列举存储桶

List<Bucket> buckets = obsClient.listBuckets();
for (Bucket bucket : buckets) {
    System.out.println("Bucket Name: " + bucket.getName());
}

3、创建存储桶

CreateBucketRequest createBucketRequest = new CreateBucketRequest(bucketName);
CreateBucketResponse createBucketResponse = obsClient.createBucket(createBucketRequest);
System.out.println("Create Bucket Response: " + createBucketResponse);

4、删除存储桶

DeleteBucketRequest deleteBucketRequest = new DeleteBucketRequest(bucketName);
DeleteBucketResponse deleteBucketResponse = obsClient.deleteBucket(deleteBucketRequest);
System.out.println("Delete Bucket Response: " + deleteBucketResponse);

5、上传文件

String objectName = "example.txt"; // 对象名称
String filePath = "/path/to/local/file"; // 本地文件路径
PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, objectName, filePath);
PutObjectResponse putObjectResponse = obsClient.putObject(putObjectRequest);
System.out.println("Put Object Response: " + putObjectResponse);

6、下载文件

String objectName = "example.txt"; // 对象名称
String saveFilePath = "/path/to/save/file"; // 下载后的本地文件路径
GetObjectRequest getObjectRequest = new GetObjectRequest(bucketName, objectName);
GetObjectResponse getObjectResponse = obsClient.getObject(getObjectRequest, saveFilePath);
System.out.println("Get Object Response: " + getObjectResponse);

7、删除文件

String objectName = "example.txt"; // 对象名称
DeleteObjectRequest deleteObjectRequest = new DeleteObjectRequest(bucketName, objectName);
DeleteObjectResponse deleteObjectResponse = obsClient.deleteObject(deleteObjectRequest);
System.out.println("Delete Object Response: " + deleteObjectResponse);

高级操作

1、分片上传

String objectName = "example.zip"; // 对象名称
String uploadFilePath = "/path/to/local/file"; // 本地文件路径
String partSize = "1024"; // 分片大小，单位：KB
UploadPartRequest uploadPartRequest = new UploadPartRequest(bucketName, objectName, uploadFilePath, Integer.parseInt(partSize));
UploadPartResponse uploadPartResponse = obsClient.uploadPart(uploadPartRequest);
System.out.println("Upload Part Response: " + uploadPartResponse);
// 分片列表
List<PartETag> partETags = new ArrayList<>();
partETags.add(uploadPartResponse.getPartETag());
// 完成上传
CompleteMultipartUploadRequest completeMultipartUploadRequest = new CompleteMultipartUploadRequest(bucketName, objectName, partETags);
CompleteMultipartUploadResponse completeMultipartUploadResponse = obsClient.completeMultipartUpload(completeMultipartUploadRequest);
System.out.println("Complete Multipart Upload Response: " + completeMultipartUploadResponse);

2、分页查询

String marker = null; // 分页查询的起始位置
int maxKeys = 100; // 每页最多查询对象数量
ListObjectsRequest listObjectsRequest = new ListObjectsRequest(bucketName, marker, maxKeys);
ListObjectsResponse listObjectsResponse = obsClient.listObjects(listObjectsRequest);
for (ObjectSummary objectSummary : listObjectsResponse.getObjectSummaries()) {
    System.out.println("Object Name: " + objectSummary.getKey());
}
// 下一页
marker = listObjectsResponse.getNextMarker();

3、设置元数据

String objectName = "example.txt"; // 对象名称
Map<String, String> metadata = new HashMap<>();
metadata.put("author", "Author Name");
metadata.put("description", "This is a sample object.");
SetObjectMetadataRequest setMetadataRequest = new SetObjectMetadataRequest(bucketName, objectName, metadata);
SetObjectMetadataResponse setMetadataResponse = obsClient.setObjectMetadata(setMetadataRequest);
System.out.println("Set Object Metadata Response: " + setMetadataResponse);

4、设置访问控制策略

String objectName = "example.txt"; // 对象名称
String cannedAcl = "private"; // 访问控制策略，如：private、public-read、public-read-write等
SetObjectAclRequest setObjectAclRequest = new SetObjectAclRequest(bucketName, objectName, cannedAcl);
SetObjectAclResponse setObjectAclResponse = obsClient setObjectAcl(setObjectAclRequest);
System.out.println("Set Object ACL Response: " + setObjectAclResponse);

本文详细介绍了华为OBS对象存储Java API的使用，包括基本操作和高级操作，通过本文的学习，读者可以快速上手华为OBS对象存储，并将其应用于实际项目中，在实际应用中，读者可以根据需求进行功能扩展和优化。