package com.springboot.Controller;

import com.springboot.Pojo.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Objects;
import java.util.UUID;

@RestController
@CrossOrigin
@RequestMapping("/upload")
@Slf4j
//文件上传接口
public class UploadController {
    /**
     * 文件上传
     * MultipartFile 文件类型参数
     */
    @PostMapping
    public Result upload(MultipartFile file) throws IOException {
        //使用uuid生成唯一文件名
        UUID uuid = UUID.randomUUID();
        //获取文件拓展名
        //获取。搜所在索引
        int indexed = Objects.requireNonNull(file.getOriginalFilename()).indexOf(".");
        //截取文件拓展名
        String ext = file.getOriginalFilename().substring(indexed);
        //拼接文件名
        String fileName = uuid + ext;
        //将文件保存在当前项目下
        File uploadPath = new File("E:\\images\\static\\uploads", fileName);
        uploadPath.getParentFile().mkdirs();
        file.transferTo(uploadPath);
        log.info("文件上传成功  {}", uploadPath.toString());
        return Result.success(file.getOriginalFilename());
    }
}

package com.springboot.Utils;

import com.aliyun.oss.*;
import com.aliyun.oss.common.auth.CredentialsProviderFactory;
import com.aliyun.oss.common.auth.EnvironmentVariableCredentialsProvider;
import com.aliyun.oss.common.comm.SignVersion;
import com.aliyun.oss.model.PutObjectRequest;
import com.aliyun.oss.model.PutObjectResult;
import com.springboot.Pojo.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;

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

@Slf4j
@Component
//上传文件工具类
public class UploadUtils {
    //阿里云oss存储根路径
    private final String endpoint = "https://oss-cn-beijing.aliyuncs.com";
    //填写Bucket名称
    private final String bucketName = "web--uploads";
    // 填写Bucket所在地域。以华东1（杭州）为例，Region填写为cn-hangzhou。
    private final String region = "cn-beijing";

    public String uploadFile(MultipartFile file) throws com.aliyuncs.exceptions.ClientException {

        // 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();

        //使用uuid生成唯一文件名
        UUID uuid = UUID.randomUUID();
        //获取文件拓展名
        //获取。搜所在索引
        int indexed = Objects.requireNonNull(file.getOriginalFilename()).indexOf(".");
        //截取文件拓展名
        String ext = file.getOriginalFilename().substring(indexed);
        log.info("文件名{}", file.getOriginalFilename());
        //拼接文件名
        // 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 = uuid + ext;
        log.info("文件名123{}", objectName);
        // 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。
        // 创建OSSClient实例。
        ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
        clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);
        OSS ossClient = OSSClientBuilder.create()
                .endpoint(endpoint)
                .credentialsProvider(credentialsProvider)
                .clientConfiguration(clientBuilderConfiguration)
                .region(region)
                .build();

        try {
            InputStream inputStream = file.getInputStream();
            // 创建PutObjectRequest对象。
            PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, objectName, inputStream);
            // 创建PutObject请求。
            PutObjectResult result = ossClient.putObject(putObjectRequest);
            //返回结果
            String[] urlArr = endpoint.split("//");
            return urlArr[0] + "//" + bucketName + "." + urlArr[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());
            return null;
        } catch (ClientException | IOException 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());
            return null;
        } finally {
            ossClient.shutdown();
        }
    }
}