注册阿里云账号后,开通好对象存储服务（OSS），三个月试用
目录
[2. 将上传文件流的Demo测试类复制到test文件里](#2. 将上传文件流的Demo测试类复制到test文件里)
[1. 在yml文件配置自定义阿里云OSS信息](#1. 在yml文件配置自定义阿里云OSS信息)
一.创建Bucket
二.获取AccessKey（密钥）
注意：保存好你的AccessKey ID！！
三.参考官方SDK文件，编写入门程序
1.复制阿里云OSS依赖，粘贴到pom.xml文件里
XML
<!--阿里云OSS-->
<dependency>
<groupId>com.aliyun.oss</groupId>
<artifactId>aliyun-sdk-oss</artifactId>
<version>3.15.1</version>
</dependency>
2. 将上传文件流的Demo测试类复制到test文件里
java
import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.common.auth.*;
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 Demo {
public static void main(String[] args) throws Exception {
// Endpoint以华东1（杭州）为例，其它Region请按实际情况填写。
String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
// 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();
// 填写Bucket名称，例如examplebucket。
String bucketName = "examplebucket";
// 填写Object完整路径，完整路径中不能包含Bucket名称，例如exampledir/exampleobject.txt。
String objectName = "exampledir/exampleobject.txt";
// 填写本地文件的完整路径，例如D:\\localpath\\examplefile.txt。
// 如果未指定本地路径，则默认从示例程序所属项目对应本地路径中上传文件流。
String filePath= "D:\\localpath\\examplefile.txt";
// 创建OSSClient实例。
OSS ossClient = new OSSClientBuilder().build(endpoint, credentialsProvider);
try {
InputStream inputStream = new FileInputStream(filePath);
// 创建PutObjectRequest对象。
PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, objectName, inputStream);
// 创建PutObject请求。
PutObjectResult result = ossClient.putObject(putObjectRequest);
} 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();
}
}
}
} 注意：需配置环境变量，然后修改为自己的配置！！
①添加系统环境变量，即你的AccesskKyId和accessKeySecret
②修改Demo里的endpoint、bucketName、objectName和filePath
只需修改这四个用于测试，运行Demo，查看OSS，上传成功！
四.集成OSS（运用于项目中）
1. 在yml文件配置自定义阿里云OSS信息
①在AliOSSProperties类中，先使用@ConfigurationProperties自动注入到yml中
java
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
@Data
@Component
@ConfigurationProperties(prefix = "aliyun.oss")
public class AliOSSProperties {
private String endpoint;
private String accessKeyId;
private String accessKeySecret;
private String bucketName;
}②然后在yml文件中配置阿里云OSS
2.编写阿里云工具类（官方代码改编）
java
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;
import java.io.*;
import java.util.UUID;
/**
* 阿里云 OSS 工具类
*/
@Component
@ConfigurationProperties
public class AliOSSUtils {
@Autowired
private AliOSSProperties aliOSSProperties;
/**
* 实现上传图片到OSS
*/
public String upload(MultipartFile file) throws IOException {
//获取阿里云OSS参数
String endpoint = aliOSSProperties.getEndpoint();
String accessKeyId = aliOSSProperties.getAccessKeyId();
String accessKeySecret = aliOSSProperties.getAccessKeySecret();
String bucketName = aliOSSProperties.getBucketName();
// 获取上传的文件的输入流
InputStream inputStream = file.getInputStream();
// 避免文件覆盖
String originalFilename = file.getOriginalFilename();
String fileName = UUID.randomUUID().toString() + originalFilename.substring(originalFilename.lastIndexOf("."));
//上传文件到 OSS
OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
ossClient.putObject(bucketName, fileName, inputStream);
//文件访问路径
String url = endpoint.split("//")[0] + "//" + bucketName + "." + endpoint.split("//")[1] + "/" + fileName;
// 关闭ossClient
ossClient.shutdown();
return url;// 把上传到oss的路径返回
}
}3.编写文件上传类（接口）
java
import com.itheima.pojo.Result;
import com.itheima.utils.AliOSSUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import java.io.IOException;
@Slf4j
@RestController
public class UploadController {
//注入阿里云工具类
@Autowired
private AliOSSUtils aliOSSUtils;
@PostMapping("/upload")
public Result upload(MultipartFile image) throws IOException {
log.info("文件上传，文件名：{}", image.getOriginalFilename());
//调用阿里云OSS工具类进行文件上传
String url = aliOSSUtils.upload(image);
log.info("文件上传完成，文件访问的url：{}", url);
return Result.success(url);
}
}至此。后端上传文件至阿里云的代码完成！！