Get all objects in a Bucket

This operation retrieves all or some of the objects in a bucket from QueryIO server.

Get bucket using S3 Compatible REST API

Following code is used to retrieve object from the bucket.

HttpURLConnection object is used to create a GET request with bucketName appended at the end of the URL.

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import org.apache.http.HttpStatus;

public class BucketOperations {
	
	/**
	 * This program gets objects from the bucket
	 * @param serverURL: URL of S3 Compatible REST server(http://<S3 server IP> : <S3 server port> /queryio/). For example: http://192.168.0.1:5667/queryio/
	 * @param token: authorization token.
	 * @bucketName: Name of the bucket to be retrieved	.
	 */	
	public void getBucket(String serverURL, String token, String bucketName)
			throws Exception {
		URL url = null;
		HttpURLConnection httpCon = null;
		InputStream is = null;
		try {
			/* append "/" at end of serverURL */
			if (!serverURL.endsWith("/")) {
				serverURL = serverURL + "/";
			}
			url = new URL(serverURL + bucketName);	//creates a URL with appending bucket name at end

			//Returns a URLConnection object that represents a connection to the remote object referred to by the URL.
			httpCon = (HttpURLConnection) url.openConnection();
						
			httpCon.setDoOutput(true);	// to use the URL connection for output
			httpCon.setRequestMethod("GET");	//GET request is used.

			httpCon.setRequestProperty("authorization", token);	//Provides token for authorization

			httpCon.connect();	//Opens a communications link to the resource reference by the URL

			if (httpCon.getResponseCode() == HttpStatus.SC_OK) {
				is = httpCon.getInputStream();	//response of GET bucket operation
				// Process response here
				StringWriter writer = new StringWriter();                 
				IOUtils.copy(is, writer, "UTF-8");                 
				System.out.println(writer.toString());	//Displaying response
			}
		} finally {
			try {
				if (is != null)
					is.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
			if (httpCon != null) {
				httpCon.disconnect();
			}
		}
	}
}
	


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