spring项目s3批量下载

你可以使用Amazon S3 SDK和Spring框架来实现Spring项目中的S3量下载。下面是一个简单的示例代码：

首先，确保你的项目中已经添加了Spring和Amazon S3 SDK的依赖。

接下来，创建一个S3Service类，用于处理S3相关的操作：

import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.model.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

@Service
public class S3Service {

    @Autowired
    private AmazonS3 s3Client;

    public void downloadFiles(String bucketName, String folderName, String localDirectory) {
        List<S3ObjectSummary> objectSummaries = listObjects(bucketName, folderName);

        for (S3ObjectSummary objectSummary : objectSummaries) {
            String key = objectSummary.getKey();
            String localFilePath = localDirectory + File.separator + key;

            downloadFile(bucketName, key, localFilePath);
        }
    }

    private List<S3ObjectSummary> listObjects(String bucketName, String folderName) {
        List<S3ObjectSummary> objectSummaries = new ArrayList<>();

        ListObjectsV2Request request = new ListObjectsV2Request()
                .withBucketName(bucketName)
                .withPrefix(folderName)
                .withDelimiter("/");

        ListObjectsV2Result result;
        do {
            result = s3Client.listObjectsV2(request);

            for (S3ObjectSummary objectSummary : result.getObjectSummaries()) {
                objectSummaries.add(objectSummary);
            }

            request.setContinuationToken(result.getNextContinuationToken());
        } while (result.isTruncated());

        return objectSummaries;
    }

    private void downloadFile(String bucketName, String key, String localFilePath) {
        s3Client.getObject(new GetObjectRequest(bucketName, key), new File(localFilePath));
    }
}

在你的Controller中，注入S3Service，并调用downloadFiles方法：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/s3")
public class S3Controller {

    @Autowired
    private S3Service s3Service;

    @GetMapping("/download")
    public String download() {
        String bucketName = "your-bucket-name";
        String folderName = "your-folder-name";
        String localDirectory = "your-local-directory";

        s3Service.downloadFiles(bucketName, folderName, localDirectory);

        return "Files downloaded successfully!";
    }
}

确保在application.properties或application.yml中配置好AWS的访问密钥(access key和secret key)和S3的区域(region)。

现在，当你访问`/s3/download`接口时，S3Service将会批量下载指定bucket下指定文件夹中的所有文件到本地目录。

请根据你的具体情况修改代码中的参数和路径。这只是一个简单的示例，你可以根据自己的需求进行修改和扩展。