SpringBoot实现上传文件到AWS S3的代码

简单记录一下在Springboot中上传文件到AWS S3存储服务的代码。

在 application.xml中添加aws相关配置：

custom: aws: access-key: CHOBITACCESSKEY secret-key: CHOBIT/THISIS006SECRET007Key/dotORG bucket: zhyea endpoint: www.zhyea.com:80

新建一个 AwsS3Componment类来执行上传文件操作：

@Componentpublic class AwsS3Component implements InitializingBean { @Value('${custom.aws.access-key}') private String accessKey; @Value('${custom.aws.secret-key}') private String accessSecret; @Value('${custom.aws.bucket}') private String bucket; @Value('${custom.aws.endpoint}') private String endpoint; private AmazonS3 client; @Override public void afterPropertiesSet() {ClientConfiguration config = new ClientConfiguration();config.setProtocol(Protocol.HTTP);config.disableSocketProxy(); this.client = AmazonS3ClientBuilder.standard().withClientConfiguration(config).withCredentials(new AWSStaticCredentialsProvider(new BasicAWSCredentials(accessKey, accessSecret))).withEndpointConfiguration(new AwsClientBuilder.EndpointConfiguration(endpoint, Regions.CN_NORTH_1.getName())).enablePathStyleAccess().build(); }}

因为使用的服务有设置endpoint，所以这里需要使用下面这一行完成endpoint的设置：

withEndpointConfiguration(new AwsClientBuilder.EndpointConfiguration(endpoint, Regions.CN_NORTH_1.getName()))

如果不设置endpoint就会收到下面这样的报错：

com.amazonaws.services.s3.model.AmazonS3Exception: The AWS Access Key Id you provided does not exist in our records. (Service: Amazon S3; Status Code: 403; Error Code: InvalidAccessKeyId; Request ID: FRDT8N0RAQFNCVDP; S3 Extended Request ID: DemEatwroXry2YN/5lyuMKDmhIi/aIz3QZPmLN0DYHeHU3oGUeOClJBcToz1J1qkcBZBfklRNs8=)at com.amazonaws.http.AmazonHttpClient$RequestExecutor.handleErrorResponse(AmazonHttpClient.java:1660)at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeOneRequest(AmazonHttpClient.java:1324)at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeHelper(AmazonHttpClient.java:1074)at com.amazonaws.http.AmazonHttpClient$RequestExecutor.doExecute(AmazonHttpClient.java:745)at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeWithTimer(AmazonHttpClient.java:719)at com.amazonaws.http.AmazonHttpClient$RequestExecutor.execute(AmazonHttpClient.java:701)

异常信息中提示了AccessKey无效——虽然我的AccessKey是有效的。

在endpoint的这行配置中还设置了region信息。如果不需要设置endpoint，就得补上region的配置：

this.client = AmazonS3ClientBuilder.standard().withClientConfiguration(config).withCredentials(new AWSStaticCredentialsProvider(new BasicAWSCredentials(accessKey, accessSecret))).withRegion(Regions.CN_NORTH_1) //Region配置.enablePathStyleAccess().build();

下面是执行上传的代码：

/** * 执行文件上传 * * @param file 要上传的文件的路径 * @param key 存储文件的路径 * @return 文件路径 */private String upload(File file, String key) { client.putObject(new PutObjectRequest(bucket, key, file).withCannedAcl(CannedAccessControlList.PublicRead)); GeneratePresignedUrlRequest urlRequest = new GeneratePresignedUrlRequest(bucket, key); URL url = client.generatePresignedUrl(urlRequest); return url.toString();}

这里是通过 File实例执行的上传。有时候会需要直接通过文件流执行上传，此时可以使用下面的代码：

private String upload(InputStream input, String key) throws IOException { Date expireDate = new Date(System.currentTimeMillis() + TimeUnit.DAYS.toMillis(30)); ObjectMetadata metadata = new ObjectMetadata(); metadata.setHttpExpiresDate(expireDate); metadata.setContentLength(input.available()); client.putObject(new PutObjectRequest(bucket, key, input, metadata).withCannedAcl(CannedAccessControlList.PublicRead)); GeneratePresignedUrlRequest urlRequest = new GeneratePresignedUrlRequest(bucket, key); URL url = client.generatePresignedUrl(urlRequest); return url.toString();}

注意这里的 setContentLength()最好配置一下。不设置会在处理的时候给出WARN。根据方法文档也可以看到，如果不设置，在上传的时候就会先在内存中缓存整个信息流来计算文件长度。

大体上就是这样了。

End！

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