Question

aws-sdk-java是Java语言版本的官方AWS SDK。本文我们将学习如何使用aws-sdk-java操作MinIO Server。

1. 前提条件

从这里下载并安装MinIO Server。

2. 设置依赖

你可以参考AWS Java SDK文档下载并安装aws-java-sdk，或者使用Apache Maven来获得相应的依赖。

…
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <aws.sdk.version>1.11.106</aws.sdk.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>com.amazonaws</groupId>
                <artifactId>aws-java-sdk-bom</artifactId>
                <version>${aws.sdk.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>aws-java-sdk-s3</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
…

3. 示例

使用下面的代码替换aws-java-sdk-1.11.213/samples/AmazonS3/S3Sample.java，并且修改Endpoint，BasicAWSCredentials，bucketName，uploadFileName和keyName成你的本地配置。

下面的示例描述的是如何使用asw-sdk-java来对MinIO Server进行上传和下载操作。

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import com.amazonaws.AmazonClientException;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.ClientConfiguration;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.client.builder.AwsClientBuilder;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.GetObjectRequest;
import com.amazonaws.services.s3.model.PutObjectRequest;
import com.amazonaws.services.s3.model.S3Object;

public class S3Sample {
    private static String bucketName = "testbucket";
    private static String keyName = "hosts";
    private static String uploadFileName = "/etc/hosts";

    public static void main(String[] args) throws IOException {
        AWSCredentials credentials = new BasicAWSCredentials("YOUR-ACCESSKEYID", "OUR-SECREYTACCESSKEY");
        ClientConfiguration clientConfiguration = new ClientConfiguration();
        clientConfiguration.setSignerOverride("AWSS3V4SignerType");

        AmazonS3 s3Client = AmazonS3ClientBuilder
                .standard()
                .withEndpointConfiguration(new AwsClientBuilder.EndpointConfiguration("http://localhost:9000", Regions.US_EAST_1.name()))
                .withPathStyleAccessEnabled(true)
                .withClientConfiguration(clientConfiguration)
                .withCredentials(new AWSStaticCredentialsProvider(credentials))
                .build();

        try {
            System.out.println("Uploading a new object to S3 from a file\n");
            File file = new File(uploadFileName);
            // 上传文件
            s3Client.putObject(new PutObjectRequest(bucketName, keyName, file));

            // 下载文件
            GetObjectRequest rangeObjectRequest = new GetObjectRequest(bucketName, keyName);
            S3Object objectPortion = s3Client.getObject(rangeObjectRequest);
            System.out.println("Printing bytes retrieved:");
            displayTextInputStream(objectPortion.getObjectContent());
        } catch (AmazonServiceException ase) {
            System.out.println("Caught an AmazonServiceException, which " + "means your request made it "
                    + "to Amazon S3, but was rejected with an error response" + " for some reason.");
            System.out.println("Error Message:    " + ase.getMessage());
            System.out.println("HTTP Status Code: " + ase.getStatusCode());
            System.out.println("AWS Error Code:   " + ase.getErrorCode());
            System.out.println("Error Type:       " + ase.getErrorType());
            System.out.println("Request ID:       " + ase.getRequestId());

        } catch (AmazonClientException ace) {
            System.out.println("Caught an AmazonClientException, which " + "means the client encountered " + "an internal error while trying to "
                    + "communicate with S3, " + "such as not being able to access the network.");
            System.out.println("Error Message: " + ace.getMessage());

        }

    }

    private static void displayTextInputStream(InputStream input) throws IOException {
        // 按行读取并打印。
        BufferedReader reader = new BufferedReader(new InputStreamReader(input));
        while (true) {
            String line = reader.readLine();
            if (line == null)
                break;

            System.out.println("    " + line);
        }
        System.out.println();
    }
}

4. 运行程序

ant
Buildfile: /home/ubuntu/aws-java-sdk-1.11.213/samples/AmazonS3/build.xml

run:
     [java] Uploading a new object to S3 from a file
     [java]
     [java] Printing bytes retrieved:
     [java]     127.0.0.1       localhost
     [java]     127.0.1.1       minio
     [java]     
     [java]     # 对于支持IPv6的主机，会有以下几行输出。
     [java]     ::1     localhost ip6-localhost ip6-loopback
     [java]     ff02::1 ip6-allnodes
     [java]     ff02::2 ip6-allrouters
     [java]

BUILD SUCCESSFUL
Total time: 3 seconds

5. 了解更多

• MinIO Java Library for Amazon S3