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Carga de un objeto

Actualización más reciente 2024-09-18 GMT+08:00

Escenarios

Puede cargar archivos de cualquier tipo a los bucket de OBS para su almacenamiento.

A continuación se describe cómo invocar a la API para cargar objetos mediante el método PUT en un bucket especificado. Para obtener más información sobre cómo invocar a una API, consulta Llamar a APIs.

Requisitos previos

  • Usted ha obtenido las AK y SK. Para obtener más información, véase Obtención de claves de acceso (AK/SK).
  • Al menos un bucket está disponible.
  • El archivo que se va a cargar ha sido preparado y usted conoce la ruta local completa del archivo.
  • Ha obtenido la región del bucket a la que desea subir archivos y ha determinado el punto de conexión necesario para las invocaciones de la API. Para obtener más información, consulte Regiones y puntos de conexión.

Cargar el objeto objecttest1 al bucket bucket001 en la región a1

En este ejemplo, se utiliza un Apache HttpClient.

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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 {

    /* Hard-coded or plaintext AK and SK are risky. For security purposes, encrypt your AK and SK and store them in the configuration file or environment variables.
    In this example, the AK and SK are stored in environment variables for identity authentication. Before running the code in this example, configure environment variables HUAWEICLOUD_SDK_AK and HUAWEICLOUD_SDK_SK. */
    public static String accessKey = System.getenv("HUAWEICLOUD_SDK_AK"); //The value is the AK obtained.
    public static String securityKey = System.getenv("HUAWEICLOUD_SDK_SK");  //The value is the SK obtained.

    public static void main(String[] str) {
        putObjectToBucket();

    }


    private static void putObjectToBucket() {

        InputStream inputStream = null;
        CloseableHttpClient httpClient = HttpClients.createDefault();
        CloseableHttpResponse httpResponse = null;
        String requestTime = DateUtils.formatDate(System.currentTimeMillis());
        HttpPut httpPut = new HttpPut("http://bucket001.obs.a1.myhuaweicloud.com/objecttest1");
        httpPut.addHeader("Date", requestTime);

         /**Calculate the signature based on the request.**/
        String contentMD5 = "";
        String contentType = "";
        String canonicalizedHeaders = "";
        String canonicalizedResource = "/bucket001/objecttest1";
        // Content-MD5 and Content-Type fields do not contain line breaks. The data format is RFC 1123, which is the same as the time in the request.
        String canonicalString = "PUT" + "\n" + contentMD5 + "\n" + contentType + "\n" + requestTime + "\n" + canonicalizedHeaders + canonicalizedResource;
        System.out.println("StringToSign:[" + canonicalString + "]");
        String signature = null;
        try {
            signature = Signature.signWithHmacSha1(securityKey, canonicalString);
            // Directory for storing uploaded files
            inputStream = new FileInputStream("D:\\OBSobject\\text01.txt");
            InputStreamEntity entity = new InputStreamEntity(inputStream);
            httpPut.setEntity(entity);

           // Added the Authorization: OBS AccessKeyID:signature field to the header.
            httpPut.addHeader("Authorization", "OBS " + accessKey + ":" + signature);
            httpResponse = httpClient.execute(httpPut);

           // Prints the sending request information and the received response message.
            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();
            }
        }
    }

}

El formato DateUtils del campo de encabezado Date es el siguiente:

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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);
    }
}

El método para calcular string de caracteres de firma es el siguiente:

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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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