文档首页/ 对象存储服务 OBS/ API参考（吉隆坡区域）/ 快速入门/ 获取桶列表
更新时间：2024-03-05 GMT+08:00
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获取桶列表

操作场景

如果用户想要查看自己创建的所有桶信息，可以使用获取桶列表接口查看。

下面介绍如何调用获取桶列表API，API的调用方法请参见如何调用API。

前提条件

  • 已获取AK和SK，获取方法参见获取访问密钥（AK/SK）。
  • 您需要明确需要列举的桶所在的区域信息，并根据区域确定调用API的Endpoint，详细信息请参见终端节点。

获取a1区域的桶列表

示例中使用通用的Apache Http Client。

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package com.obsclient;

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

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.entity.InputStreamEntity;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;


public class TestMain {

    /* 认证用的ak和sk硬编码到代码中或者明文存储都有很大的安全风险，建议在配置文件或者环境变量中密文存放，使用时解密，确保安全；
    本示例以ak和sk保存在环境变量中为例，运行本示例前请先在本地环境中设置环境变量YOUR_AK和YOUR_SK。*/
    public static String accessKey = System.getenv("YOUR_AK"); //取值为获取的AK
    public static String securityKey = System.getenv("YOUR_SK");  //取值为获取的SK

    public static void main(String[] str) {

        listAllMyBuckets();

    }


    private static void listAllMyBuckets() {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        String requesttime = DateUtils.formatDate(System.currentTimeMillis());
        HttpGet httpGet = new HttpGet("http://obs.a1.example.com");
        httpGet.addHeader("Date", requesttime);

        /** 根据请求计算签名**/
        String contentMD5 = "";
        String contentType = "";
        String canonicalizedHeaders = "";
        String canonicalizedResource = "/";
        // Content-MD5 、Content-Type 没有直接换行， data格式为RFC 1123，和请求中的时间一致
        String canonicalString = "GET" + "\n" + contentMD5 + "\n" + contentType + "\n" + requesttime + "\n" + canonicalizedHeaders + canonicalizedResource;
        System.out.println("StringToSign:[" + canonicalString + "]");
        String signature = null;
        try {
            signature = Signature.signWithHmacSha1(securityKey, canonicalString);

            // 增加签名头域 Authorization: OBS AccessKeyID:signature
            httpGet.addHeader("Authorization", "OBS " + accessKey + ":" + signature);
            CloseableHttpResponse httpResponse = httpClient.execute(httpGet);

            // 打印发送请求信息和收到的响应消息
            System.out.println("Request Message:");
            System.out.println(httpGet.getRequestLine());
            for (Header header : httpGet.getAllHeaders()) {
                System.out.println(header.getName() + ":" + header.getValue());
            }

            System.out.println("Response Message:");
            System.out.println(httpResponse.getStatusLine());
            for (Header header : httpResponse.getAllHeaders()) {
                System.out.println(header.getName() + ":" + header.getValue());
            }
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    httpResponse.getEntity().getContent()));

            String inputLine;
            StringBuffer response = new StringBuffer();

            while ((inputLine = reader.readLine()) != null) {
                response.append(inputLine);
            }
            reader.close();
            // print result
            System.out.println(response.toString());
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }

}

其中Date头域DateUtils的格式为：

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package com.obsclient;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Locale;
import java.util.TimeZone;

public class DateUtils {

    public static String formatDate(long time)
    {
        DateFormat serverDateFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z", Locale.ENGLISH);
        serverDateFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
        return serverDateFormat.format(time);
    }
}

签名字符串Signature的计算方法为：

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package com.obsclient;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.NoSuchAlgorithmException;
import java.security.InvalidKeyException;
import java.util.Base64;

public class Signature {
    public static String signWithHmacSha1(String sk, String canonicalString) throws UnsupportedEncodingException {

        try {
            SecretKeySpec signingKey = new SecretKeySpec(sk.getBytes("UTF-8"), "HmacSHA1");
            Mac mac = Mac.getInstance("HmacSHA1");
            mac.init(signingKey);
            return Base64.getEncoder().encodeToString(mac.doFinal(canonicalString.getBytes("UTF-8")));
        } catch (NoSuchAlgorithmException | InvalidKeyException | UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return null;
    }
}
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