Get json object data without knowing the keys :)

Dynamic Json Object Keyset Finding

import java.util.Iterator;
import java.util.Set;

import org.json.simple.JSONObject;

public class Json {
public static void main(String[] args) {
	JSONObject jsonObject = new JSONObject();
	jsonObject.put("a", "aaa");
	jsonObject.put("b", "bbb");
	
    Set keys = jsonObject.keySet();
    Iterator a = keys.iterator();
    while(a.hasNext()) {
    	String key = (String)a.next();
        // loop to get the dynamic key
        String value = (String)jsonObject.get(key);
        System.out.print("key : "+key);
        System.out.println(" value :"+value);
    }
}
}

Sqoop Java Client

Sqoop Java Client

Apache Sqoop

Apache Sqoop(TM) is a tool designed for efficiently transferring bulk data between Apache Hadoop and structured datastores such as relational databases.

Sqoop successfully graduated from the Incubator in March of 2012 and is now a Top-Level Apache project: More information

Latest stable release is 1.4.4 (download, documentation). Latest cut of Sqoop2 is 1.99.2 (download, documentation).

Here is the Java Client for Apache Sqoop import data from MySql to Hadoop hdfs :)

//Here I am using a table Persons, with columns PersonID and LastName
import org.apache.sqoop.client.SqoopClient;
import org.apache.sqoop.model.MConnection;
import org.apache.sqoop.model.MConnectionForms;
import org.apache.sqoop.model.MJob;
import org.apache.sqoop.model.MJobForms;
import org.apache.sqoop.model.MSubmission;
import org.apache.sqoop.validation.Status;

/**
 * @author  devan
 * @date 19-Sep-2013
 * @mail msdevanms@gmail.com
 */

public class SqoopImport {
 public static void main(String[] args) {
  
  
  String connectionString = "jdbc:mysql://YourMysqlIP:3306/test";
  String username = "YourMysqUserName";
  String password = "YourMysqlPassword";
  String schemaName = "YourMysqlDB";
  String tableName = "Persons";
  String columns = "PersonID,LastName"; //comma seperated column names
  String partitionColumn = "PersonID";
  String outputDirectory = "/output/Persons";
  String url = "http://YourSqoopIP:12000/sqoop/";

  
  SqoopClient client = new SqoopClient(url);
  //client.setServerUrl(newUrl);
  //Dummy connection object
  MConnection newCon = client.newConnection(1);

  //Get connection and framework forms. Set name for connection
  MConnectionForms conForms = newCon.getConnectorPart();
  MConnectionForms frameworkForms = newCon.getFrameworkPart();
  newCon.setName("MyConnection");

  //Set connection forms values
  conForms.getStringInput("connection.connectionString").setValue(connectionString);
  conForms.getStringInput("connection.jdbcDriver").setValue("com.mysql.jdbc.Driver");
  conForms.getStringInput("connection.username").setValue(username);
  conForms.getStringInput("connection.password").setValue(password);

  frameworkForms.getIntegerInput("security.maxConnections").setValue(0);

  Status status  = client.createConnection(newCon);
  if(status.canProceed()) {
   System.out.println("Created. New Connection ID : " +newCon.getPersistenceId());
  } else {
   System.out.println("Check for status and forms error ");
  }

  //Creating dummy job object
  MJob newjob = client.newJob(newCon.getPersistenceId(), org.apache.sqoop.model.MJob.Type.IMPORT);
  MJobForms connectorForm = newjob.getConnectorPart();
  MJobForms frameworkForm = newjob.getFrameworkPart();

  newjob.setName("ImportJob");
  //Database configuration
  connectorForm.getStringInput("table.schemaName").setValue(schemaName);
  //Input either table name or sql
  connectorForm.getStringInput("table.tableName").setValue(tableName);
  //connectorForm.getStringInput("table.sql").setValue("select id,name from table where ${CONDITIONS}");
  
  
  connectorForm.getStringInput("table.columns").setValue(columns);
  connectorForm.getStringInput("table.partitionColumn").setValue(partitionColumn);
  
  //Set boundary value only if required
  //connectorForm.getStringInput("table.boundaryQuery").setValue("");

  //Output configurations
  frameworkForm.getEnumInput("output.storageType").setValue("HDFS");
  frameworkForm.getEnumInput("output.outputFormat").setValue("TEXT_FILE");//Other option: SEQUENCE_FILE / TEXT_FILE
  frameworkForm.getStringInput("output.outputDirectory").setValue(outputDirectory);
  //Job resources
  frameworkForm.getIntegerInput("throttling.extractors").setValue(1);
  frameworkForm.getIntegerInput("throttling.loaders").setValue(1);

  status = client.createJob(newjob);
  if(status.canProceed()) {
   System.out.println("New Job ID: "+ newjob.getPersistenceId());
  } else {
   System.out.println("Check for status and forms error ");
  }
  //Now Submit the Job
  MSubmission submission = client.startSubmission(newjob.getPersistenceId());
  System.out.println("Status : " + submission.getStatus());
 
 }

 
}

Save a webpage using JAVA

Save a webpage using JAVA

import java.io.InputStream;
import java.net.URI;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;


public class DownloadWebpage {
public static void main(String[] args) {
    Path path = Paths.get("PATH TO SAVE WEB PAGE"); // Eg: /home/devan/google
       URI u = URI.create("https://www.google.co.in/");
       try (InputStream in = u.toURL().openStream()) {
           Files.copy(in, path);
   } catch (Exception e) {
    e.printStackTrace();
   }
}
}