content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  package samples;
  
  import java.io.BufferedReader;
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.io.OutputStreamWriter;
  import java.io.Writer;
  
  import com.aliyun.oss.ClientException;
  import com.aliyun.oss.OSS;
  import com.aliyun.oss.OSSClientBuilder;
  import com.aliyun.oss.OSSException;
  import com.aliyun.oss.model.Bucket;
  import com.aliyun.oss.model.CannedAccessControlList;
  import com.aliyun.oss.model.CreateBucketRequest;
  import com.aliyun.oss.model.ListBucketsRequest;
  import com.aliyun.oss.model.OSSObject;
  import com.aliyun.oss.model.OSSObjectSummary;
  import com.aliyun.oss.model.ObjectAcl;
  import com.aliyun.oss.model.ObjectListing;
  import com.aliyun.oss.model.PutObjectRequest;
  
  /**
   * This sample demonstrates how to get started with basic requests to Aliyun OSS 
   * using the OSS SDK for Java.
   */
  public class GetStartedSample {
      
      private static String endpoint = "<endpoint, http://oss-cn-hangzhou.aliyuncs.com>";
      private static String accessKeyId = "<accessKeyId>";
      private static String accessKeySecret = "<accessKeySecret>";
      private static String bucketName = "<bucketName>";
      private static String key = "<key>";
      
      public static void main(String[] args) throws IOException {
          /*
           * Constructs a client instance with your account for accessing OSS
           */
          OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
          
          System.out.println("Getting Started with OSS SDK for Java\n");
          
          try {
  
              /*
               * Determine whether the bucket exists
               */
              if (!ossClient.doesBucketExist(bucketName)) {
                  /*
                   * Create a new OSS bucket
                   */
                  System.out.println("Creating bucket " + bucketName + "\n");
                  ossClient.createBucket(bucketName);
                  CreateBucketRequest createBucketRequest= new CreateBucketRequest(bucketName);
                  createBucketRequest.setCannedACL(CannedAccessControlList.PublicRead);
                  ossClient.createBucket(createBucketRequest);
              }
  
              /*
               * List the buckets in your account
               */
              System.out.println("Listing buckets");
              
              ListBucketsRequest listBucketsRequest = new ListBucketsRequest();
              listBucketsRequest.setMaxKeys(500);
              
              for (Bucket bucket : ossClient.listBuckets()) {
                  System.out.println(" - " + bucket.getName());
              }
              System.out.println();
              
              /*
               * Upload an object to your bucket
               */
              System.out.println("Uploading a new object to OSS from a file\n");
              ossClient.putObject(new PutObjectRequest(bucketName, key, createSampleFile()));
              
              /*
               * Determine whether an object residents in your bucket
               */
              boolean exists = ossClient.doesObjectExist(bucketName, key);
              System.out.println("Does object " + bucketName + " exist? " + exists + "\n");
              
              ossClient.setObjectAcl(bucketName, key, CannedAccessControlList.PublicRead);
              ossClient.setObjectAcl(bucketName, key, CannedAccessControlList.Default);
              
              ObjectAcl objectAcl = ossClient.getObjectAcl(bucketName, key);
              System.out.println("ACL:" + objectAcl.getPermission().toString());
              
              /*
               * Download an object from your bucket
               */
              System.out.println("Downloading an object");
              OSSObject object = ossClient.getObject(bucketName, key);
              System.out.println("Content-Type: "  + object.getObjectMetadata().getContentType());
              displayTextInputStream(object.getObjectContent());
  
              /*
               * List objects in your bucket by prefix
               */
              System.out.println("Listing objects");
              ObjectListing objectListing = ossClient.listObjects(bucketName, "My");
              for (OSSObjectSummary objectSummary : objectListing.getObjectSummaries()) {
                  System.out.println(" - " + objectSummary.getKey() + "  " +
                                     "(size = " + objectSummary.getSize() + ")");
              }
              System.out.println();
  
              /*
               * Delete an object
               */
              System.out.println("Deleting an object\n");
              ossClient.deleteObject(bucketName, key);
              
          } catch (OSSException oe) {
              System.out.println("Caught an OSSException, which means your request made it to OSS, "
                      + "but was rejected with an error response for some reason.");
              System.out.println("Error Message: " + oe.getErrorMessage());
              System.out.println("Error Code:       " + oe.getErrorCode());
              System.out.println("Request ID:      " + oe.getRequestId());
              System.out.println("Host ID:           " + oe.getHostId());
          } catch (ClientException ce) {
              System.out.println("Caught an ClientException, which means the client encountered "
                      + "a serious internal problem while trying to communicate with OSS, "
                      + "such as not being able to access the network.");
              System.out.println("Error Message: " + ce.getMessage());
          } finally {
              /*
               * Do not forget to shut down the client finally to release all allocated resources.
               */
              ossClient.shutdown();
          }
      }
      
      private static File createSampleFile() throws IOException {
          File file = File.createTempFile("oss-java-sdk-", ".txt");
          file.deleteOnExit();
  
          Writer writer = new OutputStreamWriter(new FileOutputStream(file));
          writer.write("abcdefghijklmnopqrstuvwxyz\n");
          writer.write("0123456789011234567890\n");
          writer.close();
  
          return file;
      }
  
      private static void displayTextInputStream(InputStream input) throws IOException {
          BufferedReader reader = new BufferedReader(new InputStreamReader(input));
          while (true) {
              String line = reader.readLine();
              if (line == null) break;
  
              System.out.println("    " + line);
          }
          System.out.println();
          
          reader.close();
      }
  
  }
  