阿里云上传文件的实例

package com.itheima;
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 = "";
    // 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();

String accessKeyId="";

String accessKeySecret="";

// 填写Bucket名称，例如examplebucket。

String bucketName = "";

// 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 = "1.jpg";

// 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= "";
    // 创建OSSClient实例。
    OSS ossClient = new OSSClientBuilder().build(endpoint,accessKeyId, accessKeySecret);

    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();
        }
    }
}

}

package com.itheima.utils;

import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.io.InputStream;
import java.util.UUID;

public class AliOSSUtils {
    private String endpoint="";
    private String accessKeyId="";
    private String accessKeySecret="";
    private String bucketName="";
    public String upload(MultipartFile img) throws IOException {
        //获取上传文件的输入流
        InputStream inputStream=img.getInputStream();
        //避免文件覆盖
        String orignalName=img.getOriginalFilename();
        int index =orignalName.lastIndexOf(".");
        String endName= UUID.randomUUID().toString()+orignalName.substring(index);
        //上传文件到oss
        OSS ossClient=new OSSClientBuilder().build(endpoint,accessKeyId,accessKeySecret);
        ossClient.putObject(bucketName,endName,inputStream);

        //文件访问路径
        String url=endpoint.split("//")[0]+"//"+bucketName+endpoint.split("//")[1]+"/"+endName;

        //关闭ossClient
        ossClient.shutdown();
        return url;
    }
}