使用 AWS SDK 解析 Amazon S3 URI - Amazon Simple Storage Service

使用 AWS SDK 解析 Amazon S3 URI

以下代码示例显示如何解析 Amazon S3 URI 以提取诸如桶名称和对象密钥等重要组件。

Java
SDK for Java 2.x
注意

查看 GitHub,了解更多信息。查找完整示例,学习如何在 AWS 代码示例存储库中进行设置和运行。

使用 S3Uri 类解析 Amazon S3 URI。

import org.slf4j.Logger; import org.slf4j.LoggerFactory; import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.s3.S3Client; import software.amazon.awssdk.services.s3.S3Uri; import software.amazon.awssdk.services.s3.S3Utilities; import java.net.URI; import java.util.List; import java.util.Map; /** * * @param s3Client - An S3Client through which you acquire an S3Uri instance. * @param s3ObjectUrl - A complex URL (String) that is used to demonstrate S3Uri * capabilities. */ public static void parseS3UriExample(S3Client s3Client, String s3ObjectUrl) { logger.info(s3ObjectUrl); // Console output: // 'https://s3.us-west-1.amazonaws.com/myBucket/resources/doc.txt?versionId=abc123&partNumber=77&partNumber=88'. // Create an S3Utilities object using the configuration of the s3Client. S3Utilities s3Utilities = s3Client.utilities(); // From a String URL create a URI object to pass to the parseUri() method. URI uri = URI.create(s3ObjectUrl); S3Uri s3Uri = s3Utilities.parseUri(uri); // If the URI contains no value for the Region, bucket or key, the SDK returns // an empty Optional. // The SDK returns decoded URI values. Region region = s3Uri.region().orElse(null); log("region", region); // Console output: 'region: us-west-1'. String bucket = s3Uri.bucket().orElse(null); log("bucket", bucket); // Console output: 'bucket: myBucket'. String key = s3Uri.key().orElse(null); log("key", key); // Console output: 'key: resources/doc.txt'. Boolean isPathStyle = s3Uri.isPathStyle(); log("isPathStyle", isPathStyle); // Console output: 'isPathStyle: true'. // If the URI contains no query parameters, the SDK returns an empty map. Map<String, List<String>> queryParams = s3Uri.rawQueryParameters(); log("rawQueryParameters", queryParams); // Console output: 'rawQueryParameters: {versionId=[abc123], partNumber=[77, // 88]}'. // Retrieve the first or all values for a query parameter as shown in the // following code. String versionId = s3Uri.firstMatchingRawQueryParameter("versionId").orElse(null); log("firstMatchingRawQueryParameter-versionId", versionId); // Console output: 'firstMatchingRawQueryParameter-versionId: abc123'. String partNumber = s3Uri.firstMatchingRawQueryParameter("partNumber").orElse(null); log("firstMatchingRawQueryParameter-partNumber", partNumber); // Console output: 'firstMatchingRawQueryParameter-partNumber: 77'. List<String> partNumbers = s3Uri.firstMatchingRawQueryParameters("partNumber"); log("firstMatchingRawQueryParameter", partNumbers); // Console output: 'firstMatchingRawQueryParameter: [77, 88]'. /* * Object keys and query parameters with reserved or unsafe characters, must be * URL-encoded. * For example replace whitespace " " with "%20". * Valid: * "https://s3.us-west-1.amazonaws.com/myBucket/object%20key?query=%5Bbrackets%5D" * Invalid: * "https://s3.us-west-1.amazonaws.com/myBucket/object key?query=[brackets]" * * Virtual-hosted-style URIs with bucket names that contain a dot, ".", the dot * must not be URL-encoded. * Valid: "https://my.Bucket.s3.us-west-1.amazonaws.com/key" * Invalid: "https://my%2EBucket.s3.us-west-1.amazonaws.com/key" */ } private static void log(String s3UriElement, Object element) { if (element == null) { logger.info("{}: {}", s3UriElement, "null"); } else { logger.info("{}: {}", s3UriElement, element.toString()); } }

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