This post will show you how we can quickly create a node.js web aplication based on express framework and how to deploy that application on AWS using AWS BeanStalk service. Now first you need to know what is AWS BeanStalk? Some information about AWS BeanStalk: AWS BeanStalk is the fastest and simplest way to deploy … Continue reading How to deploy your node.js web application with AWS Beanstalk?
Given an array of integers, return indices of the two numbers such that they add up to a specific target. Each input should have exactly one solution and you may not use the same element twice. Example, arr_nums = [7, 4, 2, 11, 20], target = 6 Here, arr_nums[1] + arr_nums[2] = 6 So, return … Continue reading Data Structures in Java: Two Sum Problem
Spring Framework for Java has been around past 15 years since its initial release. Most of the web developers prefer spring to build enterprise level web apps. But since last 3-4 years the Javascript has become more popular not only in the client-side development(Angular and React) but also towards the server-side development, thanks to nodejs. … Continue reading Java-Spring or JavaScript-Node.js?
Since the launch of the first website made by Tim Berners-Lee in 1991, the website development practice have come a long way and every year new web design and development trends are coming. Developers are becoming more agile in learning about these new trends. In 2018, we'll look at the new trends which are hot … Continue reading Web Development Trends in 2018 and for future!
Spring Framework is a powerful lightweight web application development framework used for Java Enterprise Edition (JAVAEE). Spring is described as a complete and a modular framework. The Spring Framework can be used in all layers of implementation of a real time application. It can also be used for the development of particular layer of a … Continue reading Why Spring Framework?
While working on web applications, developers face common server errors and exceptions in java based web application for example java.lang.IllegalArgumentException.
Input: 2B Output: 2000000000 Code : import java.math.BigDecimal; import java.util.Scanner; public class DyanamicConversion { public static void main(String args[]){ //Scanner scan = new Scanner(System.in); String a ="2M"; String[][] conversion = {{"K","1000"},{"M","1000000"},{"B","1000000000"}}; for(int i=0;i<conversion.length;i++){ if(a.endsWith(conversion[i][0])){ BigDecimal temp = new BigDecimal(a.substring(0, a.indexOf(conversion[i][0]))); temp.multiply(new BigDecimal(conversion[i][1])); a = temp.toBigInteger().toString(); System.out.println(a); break; } } } }
HTTP/HTTPS Get/Post request /response using JAVA below. For detailed visit here: https://www.mkyong.com/java/how-to-send-http-request-getpost-in-java/ Code: import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.URL; import javax.net.ssl.HttpsURLConnection; public class HttpURLConnection { public static void main(String[] args) throws IOException { String response = httpGet("https://services.groupkt.com/state/get/IND/all"); } public static String httpGet(String urlStr) throws IOException { URL obj = new URL(urlStr); HttpsURLConnection con … Continue reading Sending HTTP GET Request to a REST API in JAVA
Use the JSONParser methods to parse a response that's returned from a call to an external service that is in JSON format, such as a JSON-encoded response of a Web service callout. Here is the code to parse the JSON string using JAVA: 1 2 3 4 5 6 7 8 9 10 11 12 … Continue reading Parsing JSON Output using JAVA
Flow Diagram of Spring MVC Img Source: TutorialsPoint Purpose of web.xml Until Spring 3.1 the only way to configure the DispatcherServlet was with the WEB-INF/web.xml file. servlet name is dispatcher an instance of DispatcherServlet Class Will be initialized with a parameter named contextConfigLocation which contains the path to the configuration XML load-on-startup is an integer … Continue reading Understanding Spring MVC project setup
Software Requirements Eclipse Mars 2 Java, jdk 1.6 and above Spring 4 jar files(download) Apache Tomcat 7 Step 1: Create a Dynamic Web Project(File>New>Dynamic Web Project) Step 2: Create project folder and packages as shown below Step 3: Add required Spring MVC libs Step 4: Add following code in web.xml Step 5: Add following code … Continue reading Spring MVC Project: Setup
