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在java项目中你可能会有以下需求：用户上传本地图片，然后展示在网页上。本篇文章将使用阿里云oss实现上传图片到oss，oss生成url。
一、准备工作
首先进入阿里云，按如下操作
进入创建页面，修改读写权限为公共读
然后进入bucket，创建AccessKey
创建后，保存好AccessKeyID和AccessKey Secret
二、代码
将以下依赖添加到项目的pom.xml文件中
<dependency> <groupId>com.aliyun.oss</groupId> <artifactId>aliyun-sdk-oss</artifactId> <version>3.15.1</version> </dependency> <dependency> <groupId>javax.xml.bind</groupId> <artifactId>jaxb-api</artifactId> <version>2.3.1</version> </dependency> <dependency> <groupId>javax.activation</groupId> <artifactId>activation</artifactId> <version>1.1.1</version> </dependency> <!-- no more than 2.3.3--> <dependency> <groupId>org.glassfish.jaxb</groupId> <artifactId>jaxb-runtime</artifactId> <version>2.3.3</version> </dependency>创建一个工具类，用于配置aliyunoss
添加以下代码：（注意修改）
import com.aliyun.oss.ClientException; import com.aliyun.oss.OSS; import com.aliyun.oss.OSSClientBuilder; import com.aliyun.oss.OSSException; import com.aliyun.oss.model.PutObjectRequest; import com.aliyun.oss.model.PutObjectResult; import java.io.FileInputStream; import java.io.InputStream; public class AliOssUtil { // Endpoint以华东1（杭州）为例，其它Region请按实际情况填写。 private static final String ENPOINT = "地区"; // 从环境变量中获取访问凭证。运行本代码示例之前，请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。 // EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider(); private static final String ACCESS_KEY_ID="你的ID"; private static final String ACCESS_KEY_SECRT="KEY"; // 填写Bucket名称，例如examplebucket。 private static final String BUCKETNAME = "你的bucket名称"; public static String uploadFile(String objectName, InputStream in) throws Exception { // 创建OSSClient实例。 OSS ossClient = new OSSClientBuilder().build(ENPOINT,ACCESS_KEY_ID,ACCESS_KEY_SECRT); String url = ""; try { // 填写字符串。 String content = "Hello OSS，你好世界"; // 创建PutObjectRequest对象。 PutObjectRequest putObjectRequest = new PutObjectRequest(BUCKETNAME, objectName,in); // 如果需要上传时设置存储类型和访问权限，请参考以下示例代码。 // ObjectMetadata metadata = new ObjectMetadata(); // metadata.setHeader(OSSHeaders.OSS_STORAGE_CLASS, StorageClass.Standard.toString()); // metadata.setObjectAcl(CannedAccessControlList.Private); // putObjectRequest.setMetadata(metadata); // 上传字符串。 PutObjectResult result = ossClient.putObject(putObjectRequest); //url组成:http://bucket名称.区域节点 url = "https://" + BUCKETNAME + "." + ENPOINT.substring(ENPOINT.lastIndexOf("/")+1)+"/"+objectName; } catch (OSSException oe) { System.out.println("Caught an OSSException, which means your request made it to OSS, " + "but was rejected with an error response for some reason."); System.out.println("Error Message:" + oe.getErrorMessage()); System.out.println("Error Code:" + oe.getErrorCode()); System.out.println("Request ID:" + oe.getRequestId()); System.out.println("Host ID:" + oe.getHostId()); } catch (ClientException ce) { System.out.println("Caught an ClientException, which means the client encountered " + "a serious internal problem while trying to communicate with OSS, " + "such as not being able to access the network."); System.out.println("Error Message:" + ce.getMessage()); } finally { if (ossClient != null) { ossClient.shutdown(); } } return url; } }然后在控制类中使用
@RestController public class FileUploadController { @PostMapping("/upload") public Result<String> upload(MultipartFile file) throws Exception { String originalFilename = file.getOriginalFilename(); //保证文件名字唯一，防止文件覆盖 String filename = UUID.randomUUID().toString()+originalFilename.substring(originalFilename.lastIndexOf(".")); String url = AliOssUtil.uploadFile(filename,file.getInputStream()); return Result.success(url); } }三、测试接口
这里使用apifox进行测试
发送请求后，可以看到图片已经存储到oss上，并且返回了地址。
