一、阿里云对象存储

官方文档：https://help.aliyun.com/zh/oss/getting-started/getting-started-with-oss?spm=a2c4g.11186623.0.0.299a646c6nWWcW

1.引入maven

官网：https://help.aliyun.com/zh/oss/developer-reference/java-installation?spm=a2c4g.11186623.0.i12

<dependency>
    <groupId>com.aliyun.oss</groupId>
    <artifactId>aliyun-sdk-oss</artifactId>
    <version>3.15.1</version>
</dependency>

如果使用的是Java 9及以上的版本，则需要添加JAXB相关依赖。添加JAXB相关依赖示例代码如下：

<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>

2.Endpoint地址获取

3.环境变量配置

官网：https://help.aliyun.com/zh/oss/developer-reference/oss-java-configure-access-credentials?spm=a2c4g.11186623.0.i14
以windows为例，配置之后重启idea工具（我这配置之后没生效，重启之后生效）

4.工具类

package com.dcqq.common.utils;

import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.common.auth.CredentialsProviderFactory;
import com.aliyun.oss.common.auth.EnvironmentVariableCredentialsProvider;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;

public class AliYunOssUtil {

    // Endpoint以华东1（杭州）为例，其它Region请按实际情况填写。
    private static String endpoint = "https://oss-cn-beijing.aliyuncs.com";

    // 填写Bucket名称，例如examplebucket。
    private static String bucketName = "examplebucket";

    private static String url = "https://"+bucketName+".oss-cn-beijing.aliyuncs.com/";

    /**
     * 文件上传
     * @param bytes
     * @param objectName 阿里云存储文件的位置，包括文件名，不包含存储桶bucket名称，如：upload/1.png ，注意：upload前面不能有斜杠
     * @return
     * @throws Exception
     */
    public static String upload(byte[] bytes,String objectName) throws Exception {
        // 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();

        //创建OSSClient实例
        OSS ossClient = new OSSClientBuilder().build(endpoint, credentialsProvider);

        ossClient.putObject(bucketName, objectName, new ByteArrayInputStream(bytes));
        return url+objectName;
    }


    public static void main(String[] args) throws Exception {
        File file=new File("C:\\图片\\1.png");
        FileInputStream fileInputStream=new FileInputStream(file);
        byte[] fileBytes = new byte[(int) file.length()];
        fileInputStream.read(fileBytes);
        upload(fileBytes,"upload/1.png");

    }
}