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创建桶

创建桶

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更新时间:2021/01/13 GMT+08:00

操作场景

桶是OBS中存储对象的容器。您需要先创建一个桶,然后才能在OBS中存储数据。

下面介绍如何调用创建桶API在指定的区域创建一个桶,API的调用方法请参见如何调用API

前提条件

区域一旦确定,创建完成后无法修改。

在cn-north-4区域创建一个名为bucket001的桶

示例中使用通用的Apache Http Client。
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package com.obsclient;

import java.io.*;

import org.apache.http.Header;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;

public class TestMain {

    public static String accessKey = "UDSIAMSTUBTEST000012"; //取值为获取的AK
    public static String securityKey = "Udsiamstubtest000000UDSIAMSTUBTEST000012";  //取值为获取的SK
    public static String region = "cn-north-4"; // 取值为规划桶所在的区域
    public static String createBucketTemplate =
            "<CreateBucketConfiguration " +
            "xmlns=\"http://obs.cn-north-4.myhuaweicloud.com/doc/2015-06-30/\">\n" +
            "<Location>" + region + "</Location>\n" +
            "</CreateBucketConfiguration>";

    public static void main(String[] str) {

         createBucket();

    }

    private static void createBucket() {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        String requesttime = DateUtils.formateDate(System.currentTimeMillis());
        String contentType = "application/xml";
        HttpPut httpPut = new HttpPut("http://bucket001.obs.cn-north-4.myhuaweicloud.com");
        
        
        httpPut.addHeader("Date", requesttime);
        httpPut.addHeader("Content-Type", contentType);

        /** 根据请求计算签名**/
        String contentMD5 = "";
        String canonicalizedHeaders = "";
        String canonicalizedResource = "/bucket001/";
        // 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 = "PUT" + "\n" + contentMD5 + "\n" + contentType + "\n" + requesttime + "\n" + canonicalizedHeaders + canonicalizedResource;
        System.out.println("StringToSign:[" + canonicalString + "]");
        String signature = null;
        CloseableHttpResponse httpResponse = null;
        try {
            signature = Signature.signWithHmacSha1(securityKey, canonicalString);

            // 增加签名头域 Authorization: OBS AccessKeyID:signature
            httpPut.addHeader("Authorization", "OBS " + accessKey + ":" + signature);

            // 增加body体
            httpPut.setEntity(new StringEntity(createBucketTemplate));

            httpResponse = httpClient.execute(httpPut);

            // 打印发送请求信息和收到的响应消息
            System.out.println("Request Message:");
            System.out.println(httpPut.getRequestLine());
            for (Header header : httpPut.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 formateDate(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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