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.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.ArrayList;
  import java.util.List;
  
  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.DeleteObjectsRequest;
  import com.aliyun.oss.model.DeleteObjectsResult;
  
  /**
   * This sample demonstrates how to delete objects under specfied bucket 
   * from Aliyun OSS using the OSS SDK for Java.
   */
  public class DeleteObjectsSample {
      
      private static String endpoint = "*** Provide OSS endpoint ***";
      private static String accessKeyId = "*** Provide your AccessKeyId ***";
      private static String accessKeySecret = "*** Provide your AccessKeySecret ***";
  
      private static String bucketName = "*** Provide bucket name ***";
      
      public static void main(String[] args) throws IOException {        
          /*
           * Constructs a client instance with your account for accessing OSS
           */
          OSS client = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
          
          try {
              /*
               * Batch put objects into the bucket
               */
              final String content = "Thank you for using Aliyun Object Storage Service";
              final String keyPrefix = "MyObjectKey";
              List<String> keys = new ArrayList<String>();
              for (int i = 0; i < 100; i++) {
                  String key = keyPrefix + i;
                  InputStream instream = new ByteArrayInputStream(content.getBytes());
                  client.putObject(bucketName, key, instream);
                  System.out.println("Succeed to put object " + key);
                  keys.add(key);
              }
              System.out.println();
              
              /*
               * Delete all objects uploaded recently under the bucket
               */
              System.out.println("\nDeleting all objects:");
              DeleteObjectsResult deleteObjectsResult = client.deleteObjects(
                      new DeleteObjectsRequest(bucketName).withKeys(keys));
              List<String> deletedObjects = deleteObjectsResult.getDeletedObjects();
              for (String object : deletedObjects) {
                  System.out.println("\t" + object);
              }
              System.out.println();
  
          } 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.
               */
              client.shutdown();
          }
      }
  }
  