s3根据桶名和文件路径生成临时链接下载文件 java

在Java中，Amazon S3提供了一个名为AWS SDK for Java的库来操作S3服务，包括生成预签名URL（也称作临时链接）来安全地下载文件。以下是一个简单的示例，展示如何根据桶名和文件路径生成临时链接：

import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.GeneratePresignedUrlRequest;

public class S3TempLinkGenerator {
    private static final String ACCESS_KEY = "your_access_key";
    private static final String SECRET_KEY = "your_secret_key";
    private static final AmazonS3 s3Client = AmazonS3ClientBuilder.standard()
            .withRegion("Your_S3_Region") // 替换为你S3服务所在的区域
            .withCredentials(new AWSStaticCredentialsProvider(new BasicAWSCredentials(ACCESS_KEY, SECRET_KEY)))
            .build();

    public static void main(String[] args) {
        String bucketName = "your_bucket_name";
        String filePath = "path/to/your/file.txt";

        try {
            GeneratePresignedUrlRequest request = new GeneratePresignedUrlRequest(bucketName, filePath)
                    .withMethod("GET")
                    .setExpiration(new Date(System.currentTimeMillis() + 60 * 60 * 1000)); // 设置链接有效期，单位秒

            URL url = s3Client.generatePresignedUrl(request);
            System.out.println("Temporary link to download file: " + url.toString());
        } catch (AmazonServiceException e) {
            System.err.println("Error generating presigned URL: " + e.getMessage());
        }
    }
}

在这个例子中，你需要替换`ACCESS_KEY`、`SECRET_KEY`、`bucketName`和`filePath`为你实际的值。执行这段代码后，它会打印出一个预签名的URL，你可以将这个URL作为下载链接给用户。