Top 5 Courses to learn Cloud Computing with Microsoft Azure Platform in 2025 - Best of Lot

Hello guys, if you want to learn Microsoft Azure in 2025 and looking for the best resources like online courses, books, tutorials, etc then you have come to the right place. Earlier, I have shared the best cloud computing courses and best free Azure courses but many of you asked for more comprehensive and in-depth Azure courses and here we are with the list of the 5 best Microsoft Azure courses in 2025. Microsoft Azure is, as the name implies, Microsoft's answer to Google Cloud Platform and Amazon Web Services. What that means is that it provides a wide range of cloud services like computing, storage, analytics, and networking all under one umbrella.

Top 10 Coursera Courses + Certifications to Learn Python, Data Science, and Cloud Computing in 2025 [UPDATED]

Hello folks, if you are looking for the best Coursera courses, certifications, and specialization to start your career in IT or make a career switch, you have come to the right place. Coursera is one of the leading online portals and brings the best learning material, courses, and certifications from the world's' top universities like the University of Michigan and top companies like Google, IBM, and Amazon. Learning on Coursera is a great way to learn in-demand tech skills and recognition and certification to showcase them to recruiters and companies looking to hire.

Top 7 Courses to Learn Design Patterns in Java for Experienced Programmers in 2025 - Best of Lot

Hello Java programmers, if you want to learn Design patterns in 2025 and looking for the best resources like books, tutorials, and online courses then you have come to the right place. Earlier, I have shared the best design pattern books, interview questions, and design pattern tutorials and in this article, I am going to share the best design pattern courses for Java developers. A design pattern is the tried and tested solution of classical software problems which is common during software development. Knowing design pattern not only help you to solve those problems quickly but also encouraged you to use tried and tested solution, thus overall improving the quality of the software application you are building.

Top 7 Courses to Learn PyTorch and Keras for Beginners in 2025 - Best of Lot [UPDATED]

Hello guys, if you want to learn PyTorch and Kearas from scratch and look for the best PyTorch and Keras online courses, you have come to the right place. In the past, I have shared the best machine learning courses and best TensorFlow courses, and today I will share the best Keras and Pytorch courses for beginners and experienced programmers. PyTorch and Keras are two deep learning libraries developed by two big companies, Facebook and Google, aiming to facilitate the creation of deep learning applications like face recognition and self-driving cars, and so on.

Top 5 Free Courses to crack AWS Solution Architect Certification in 2025 - Best of Lot

A professional certificate speaks louder than a typical CV. Not all certificate holds worth, but some professional certificate does! AWS (Amazon web services) Solution architect associate is one of the most prestigious certifications. There is a lot of demand for AWS certified Solution architects as many companies seek experts who can manage their AWS assets. Amazon also ensures that their partners have certified AWS professionals which further fuels the demand for AWS certification. Given the future of Software development is on the cloud and sooner or later most of the companies will move to the different cloud platforms, particularly AWS gave it's the most popular public cloud, investing your time on acquiring AWS certification can really boost your profile in 2025.

Top 6 Docker Courses for Java and Microservices Developers in 2025 - Best of Lot

Hello Java programmer, if you want to learn Docker and looking for the best Docker Courses from Java and Spring Boot developer point of view, then you have come to the right place. Earlier, I shared free Spring Boot courses and Docker courses, and in this article, I will share the best Docker courses for Java and Spring developers. Java is one of the most popular and widely used programming languages. It is an evergreen programming language. For Java developers, Docker is a game-changer. Docker is emerging rapidly, and it's now one of the most essential tools for all kinds of programmers, and there are reasons for it like Docker makes both development and deployment easier.

Top 6 Blockchain Courses and Certifications for Beginners in 2025 - Best of Lot

Hello guys, if you are interested in Crypto currencies like Bitcoin and Ethereum, then you've probably heard about Blockchain. Unless you're living under a rock . I'm talking about this new technology that offers what cryptocurrencies were most dangerous about… safety. With Blockchain, transaction safety is a must every time. Big companies invest big stacks of money in finding experts in this field. A blockchain expert's salary can go as high as $150,000 per year. So yeah, if you were thinking of learning about Blockchain, this is the right time to do so.

Top 5 Online Courses to Learn MySQL Database in 2025 - Best of Lot

Hello guys, if you want to learn MySQL and SQL in 2025 and looking for the best resources like online courses, tutorials, and books then you have come to the right place. Earlier, I have shared the best SQL courses, books, and SQL interview questions and today, I am going to share the best online courses to learn MySQL in 2025. As you most probably know, MySQL is one of the big players in the Big Data technological ecosystem. It is one of the most popular databases in the world and has wide-ranging capabilities. It is used in a wide variety of industries, and so every half-decent programmer should at least have a basic understanding of MySQL.

Top 6 Courses to Learn Neural Networks and Deep Learning in 2025 - Best of Lot

Hello folks, if you are looking for the best online courses to learn Deep Learning and Neural networks in 2025 then you have come to the right place. In the past, I have shared the best Data Science courses, best Data Science websites, and best Machine Learning courses, and in this article, I am going to share the best online courses to learn Data Science and Machine Learning for Beginners. I have hoped a lot of online platforms and websites to find deep learning courses which not only cover essential concepts but also cover them in a way that can be easily understood, but most of the courses fall short of it.

10 Books and Courses to Prepare Technical Programming/Coding Job Interviews in 2025

If you are preparing for a technical interview in the software development sector and looking for some great books to boost your preparation, then you have come to the right place. In the past, I have hared some of the best online courses to prepare coding interviews. In this article, I am going to share some of the best programming/coding interview books to prepare well for any software development jobs. These books are enough to crack even the toughest of the job interviews at Google, Amazon, or Microsoft. They provide excellent coverage of all essential topics for programming job interviews like data structure and algorithms, system design, algorithm design, computer science fundamentals, SQL, Linux, Java, Networking, etc.

How to Reverse words in String Java? [Solution]

Hello guys, if you are wondering how to reverse words in a given String in Java then you have come to the right place. Earlier, I have shared 75 Programming interview questions and In this Java Coding tutorial, you will learn how to reverse words in String. It's also one of the popular coding questions, so you will also learn how to take a requirement, how to fill gaps in the requirement by asking the right question. A String is nothing but a sentence, which may contain multiple works, or just contain a single word or it may be empty. Your program must produce a String that contains the word in reverse order, for example, if the given input is "Java is Great" then your program should return "Great is Java".

[Solved] How to remove duplicate elements from Array in Java? Example

This is one of the common technical interview questions which are asked to entry-level programmers and software engineers. There are also a lot of variants of how do you remove duplicates from an array in Java, like sometimes the array is sorted, and other times it's not sorted or unsorted. Sometimes, the Interviewer just spends more than half of the interview on this question by progressively making it more difficult by imposing new constraints like removing duplicate elements in place or without using any additional data structure, etc.

[Solved] How to Print Alphabets in Upper and Lower Case in Java? Example Tutorial

Hello guys, if you are learning Java and looking for basic programming exercise to build your concepts then you have come to the right place. Earlier, I have shared 15 common Java programming exercises and today, you will learn one of them. One of the textbook exercises to get started with any programming language is writing a program to print alphabets in both upper and lower case. This program allows you to explore the String class in Java with the toUpperCase() and toLowerCase() method but normally when you start, it's asked to do this without any API methods.

How to swap two Integers without using a temporary variable in Java? [Solution]

One of the oldest trick questions from a programming interview is, How do you swap two integers without using a temp variable? This was first asked to me on a C/C++ interview and then several times on various Java interviews. The beauty of this question lies both in the trick to thinking about how you can swap two numbers without the third variable, but also problems associated with each approach. If a programmer can think about integer overflow and consider that in its solution then it creates a very good impression in the eye of interviewers.

How to check if Array contains given Number or String in Java [ Linear Search vs Binary Search]

Hello guys, one of the common coding questions from Java interviews is how to test if an Array contains a certain value or not? This is a simple question, but sometimes interview pressure makes candidates nervous. In this article, you'll learn how to solve this problem using different approaches. Since an array in Java doesn't have any inbuilt method for searching values, interviewers prefer to ask this question, to see how a candidate deals with such a situation. If you have good knowledge of Java API, then you will immediately come to know that there are alternatives available like using the binarySearch() method of Java Java .util.Arrays class or taking advantage of ArrayList contains method by first converting your array to ArrayList.

How to Print Floyd's Triangle in Java - Example Tutorial

Hello guys, In the last article, I have taught you how to print Pascal's triangle and in today's article, I'll teach you how to print Floyd's triangle in the Java program. Floyd's triangle is easier to print than Pascal's triangle because you don't need to take care of formatting the numbers as Floyd's triangle is a right-angle triangle. It is named after American computer scientist Robert Floyd, who has also contributed Floyd–Warshall algorithm, which efficiently finds all shortest paths in a graph, and Floyd's cycle-finding algorithm for detecting cycles in a sequence.

Matrix Multiplication in Java using Scanner, Class, and Function [Example]

Hello guys, if you are looking for a matrix multiplication example in Java using the scanner for user input, and using class and object-oriented programming then you have come to the right place. In this Java tutorial, I will show you how to multiply matrix in Java using an array, scanner, and object-oriented programming. We will create a class to represent matrix and then define a multiplication method to multiply two matrices in Java. I first learned about matrix in class 12th and I first wrote the program to multiply two matrices on my first semester of engineering, so, when I thought about this program, It brings a lot of memories from the past.

How to check if strings are rotations of each other in Java? String Rotation Example Solution

String-based algorithmic questions are very popular in Java interviews e.g. checking if two String is the anagram of each other (see), or checking if given String is a palindrome (see), or just finding permutations of given String (see). One of such popular String-based interview questions is about to check if two Strings are a rotation of each other in Java. In order to solve this question, you should know what is String rotation? Well, A string is made of characters and you just rotate the String around any character like "programming" will become "ingprogramm" if we rotate the String on the trailing character 3 times.

How to check is given String is a Palindrome in Java using Recursion

In this tutorial, you will learn how to check if a string is a palindrome in Java using Recursion. A String is nothing but a collection of characters like "Java," and String literals are encoded in double-quotes in Java. A String is said to be a palindrome if the reverse of String is equal to itself like "aba" is a palindrome because the opposite of "aba" is also "aba", but "abc" is not a palindrome because the reverse of "abc" is "cba" which is not equal. Recursion means solving a problem by writing a function which calls itself. In order to check if String is a palindrome in Java, we need a function that can reverse the String.

How to Reverse String in Java with or without StringBuffer Example

Reverse String in Java

There are many ways to reverse a given String in Java. For example, you can use rich Java API to quickly reverse the contents of any String object. Java library provides StringBuffer and StringBuilder class with the reverse() method which can be used to reverse String in Java. Since converting between String and StringBuffer or StringBuilder is very easy it's the easiest way available to reverse String in Java. But, in a coding interview, you may not be allowed to use the JDK API methods to solve this problem. That's why, writing a Java program to reverse String in Java without StringBuffer is one of the popular Java String interview questions, which requires you to reverse String by applying logic and by not using API methods.

How to Remove all adjacent duplicates characters from String in java? Example Tutorial

Hello guys, if you are wondering how to remove adjacent repeated characters or duplicates from a given String in Java then you have come to the right place. In the last article, we have seen how to find duplicate characters as well as how to remove duplicate characters from String in Java, and in this article, we will take that topic to another level and remove adjacent duplicates from given String. This topic gives another perspective to removing duplicates in a word or phrase. Probably before now, you are familiar with removing duplicates from a word or phrase, or number. But this topic gives a detailed understanding of how to remove adjacent duplicates.

How to Perform Binary Tree InOrder traversal in Java using Recursion? Example Tutorial

The InOrder traversal is one of the three popular ways to traverse a binary tree data structure, the other two being the preOrder and postOrder. During the in-order traversal algorithm, the left subtree is explored first, followed by root, and finally nodes on the right subtree. You start traversal from root then go to the left node, then again go to the left node until you reach a leaf node. At that point in time, you print the value of the node or mark it visited and move to the right subtree. Continuing the same algorithm until all nodes of the binary tree are visited. The InOrder traversal is also known as the left-node-right or left-root-right traversal or LNR traversal algorithm.

Java Program to find Armstrong numbers with Example

Armstrong number Example in Java
How to check if a number is an Armstrong number or not? or write a Java program to find Armstrong's number? This is a common Java interview question asked on-campus interviews and fresher-level interviews. This is also a popular Java programming exercise on various schools, colleges, and computer courses to build programming logic among Students. An Armstrong number is a 3 digit number for which the sum of cube of its digits is equal to the number itself.

How to Find Square Root of a Number in Java [Solved] - Example Tutorial

Java program for a square root or a number in Java
How to write a Java program to find the square root of a number is a common Java programming exercise that many institutes use in their Java course along with Java program to print Fibonacci series and How to find Armstrong numbers in Java, which we have seen earlier. Java program for the square root is also a popular question during college semester exams and various programming tests.

How to implement Binary Tree PreOrder Traversal in Java without Recursion? [Solved] Example Tutorial

This is my second article on how to implement binary tree pre-order traversal in Java. In the first part, I have shown how to traverse a binary tree with a pre-order traversal algorithm using Recursion, and in this article, you will learn how to implement pre-order traversal without using Recursion. You might be thinking that why do you need to learn the iterative solution if a recursive solution is possible and easy to write? Well, this type of question is mostly asked in Programming Job interviews and Interviewers like to see how comfortable a candidate is with both Recursion as well as using other data structures and iteration.

[Solved] 3 Examples to reverse an Array in Java - Example Tutorial

Hello guys, today we are going to see another common coding question from interviews - how do you reverse an array in Java? This is a popular array-based coding problem and often asked programmers during the first few rounds of interviews to check if they can code or not. Well, there are multiple ways to solve this problem and we will see three common ways to ever an array in Java. This method applies to all kinds of arrays like string array or integer array or even with arrays of objects because it's not focused on data types. The first way to reverse an array is by reversing it in a brute force way, without using any additional data structure or library method.

How to Find Even and Odd Number in Java - Program Tutorial Example

Even and Odd number check Java Example

There are many ways to find if a number is even or odd in Java but before moving into technical details on finding even and odd numbers in Java let's what is even and odd numbers in terms of Mathematics. Any number which is completely divisible by 2 is called an even number while a number that is not completely divisible by 2 is called an odd number. If you think in terms of remainder then in the case of even number, the remainder is zero while in the case of odd number remainder will be 1. zero is considered as an even number in maths.

How to Find Missing Number in a Sorted Array in Java [Solved]

Today's coding problem is not very new, it's an age-old classic Programming interview Question. You have a sorted array containing n - 1 unique number starting from 0 to n - 1. There is only one number missing in this range and you need to find that out. I mean you need to write a Java method to find the missing number and print its value in the console. Some of you might have seen this question before, but if you have not been asked this question before, what is the first approach comes into your mind to solve this question? Since only one number is missing, many programmers come up with the approach of iterating over the array, and comparing each element with the expected one like the first element should be 0, the second element should be 1, and so on.

How to Count number of 1s (Set Bits) in a binary number in Java [Solved]

Good morning folks, In today's article, we are going to discuss one of the frequently asked bit manipulation-based interview questions, how do you count the number of set bits in a given bit sequence? Bit Manipulation is an important topic in programming interviews and a good programmer should have sufficient knowledge and skill to work with binary numbers. This kind of question tests the skill of the programmer. Sometimes, it is also asked as to how to count the number of 1s (ones) in a given number? Both are the same question because 1 is also known as set bit. For example, if the given input is 1000110010 then your program should return 4, as three are only four set bits in this bit sequence.

How to Print Pyramid Pattern in Java? Program Example

Pattern based exercises are a good way to learn nested loops in Java. There are many pattern based exercises and one of them is printing Pyramid structure as shown below:

*
* *
* * *
* * * *
* * * * *

You need to write a Java program to print the above pyramid pattern. How many levels the pyramid triangle would have will be decided by the user input. You can print this kind of pattern by using print() and println() method from System.out object. System.out.print() just prints the String or character you passed to it, without adding a new line, useful to print stars in the same line.

Top 5 Courses to learn UML for Software Design and Development in 2025 - Best of Lot

Hello friends, we are here again today for another exciting topic to discuss. But, today we are not gonna discuss something which is related to Java or any other language or spring boot. Today we are gonna discuss something which is immensely practical and very important skill if you want to grow as programmer and become a tech lead or Software architecture. Yes, you guessed it right, today we are going to talk about UML (Unified Modeling Language). Modeling is a process to communicate your design which is in your mind to other people in your team like developers, architect via diagram. This is one of the most important skill if you want to become Software architect in 2025.

My Favorite Courses to learn React.js in Depth in 2025 - Best of Lot

Hello guys, if you want to learn React.js in 2025 and looking for the best resources like books, online courses, tutorials, and guides, then you have come to the right place. In the past, I have shared the best free React.js courses, best React books, websites, projects, and even a complete React.js Developer RoadMap and in this article, I am going to share the best online courses to learn React.js in 2025. You've come to the correct spot if you're a web developer or someone who is passionate about web development and want to learn React or React JS, a popular JavaScript framework for developing a component-based user interface.

Top 10 Free Git Courses for Programmers and DevOps in 2025 - Best of Lot

Hello guys, there is no doubt that Git is one of the most essential tool and skill for every programmer and Software developer. Gone are the days where different companies uses different version control like SVN, CVS, or TFS, now almost every company uses Git which has become the standard source repository and version control tool. That's why its important for every programmer to learn Git and it's not that easy. Git is a distributed version control system and there are things like remote repository, local repository, commit, pull, push, fetch, rebase, merge etc which can be confusing to many programmers and that's why I am going to share best free Git courses you can join to learn Git in 2025.

Top 5 Free Coursera Courses for SQL and Database in 2025 - Best of Lot [UPDATED]

Hello guys, if you want to learn SQL and Database and looking for best free resources like books, online courses and websites then you have come tot he right place. Earlier, I have shared best SQL courses, SQL books, and best websites to learn SQL and in this article, I am going to share best free SQL courses from Coursera, one of the best place to learn technical skill from world's top university and companies online. While many people are familiar with Coursera courses and certifications then don't know that most of the Coursera courses can be taken for free-to-audit where you can watch them for free without enrolling on specialization or professional certification. Only thing is you don't have access to quizzes and exercise sand you don't get certificate but you can still learn from worlds' top trainers and instructors.

Top 6 Online Courses to Learn CSS, Flexbox, Grid, and Sass in 2025 - Best of Lot

Hello guys, Along with HTML and JavaScript, CSS is one of the core technologies of the World Wide Web (WWW) and critical skills for anyone who wants to start their career in web design and web development. No website in the modern world is complete without CSS, and it is safe to say, no one can become a complete web developer without CSS. If you want to learn advanced CSS concepts like Flexbox, Grid, and SaaS and looking for the best online courses, then you have come to the right place. In the past, I have shared some free courses to learn CSS basics and Bootstrap, one of the most popular CSS frameworks for styling web pages, and today I will share advanced CSS courses to learn Flexbox and Grid.

10 Best Coursera Web Development Courses and Projects for Beginners in 2025

Hello guys, if you are looking for the best web development courses and projects on Coursera to join in 2025, you have come to the right place. Earlier, I have shared the best Coursera courses to learn about Cloud Computing, Software Development, and Data Science. Today, I will share the best Coursera courses and projects one can join to learn Full-stack Development and essential web development skills to become a professional web developer in 2025. The best thing about these Coursera courses and projects is that you can join them with Coursera Plus, which means you don't need to buy them individually. If you have a Coursera Plus subscription, you can enter all these courses without extra cost.

Top 20 Machine Learning Libraries for AI Engineers in 2025 - Best of Lot

Artificial Intelligence (AI) has emerged as a transformative technology, revolutionizing various industries and driving innovation. With the increasing accessibility of AI, numerous free tools have become available, enabling individuals and businesses to explore and leverage AI capabilities. In this article, we present the top 20 free Machine Learning libraries to try in 2025. These tools cover a wide range of AI applications, including machine learning, natural language processing, computer vision, and more. Let's dive into the exciting world of AI tools and discover how they can empower innovation and automation.

Top10 Platforms for Freelance Writing and Earning Money in 2025 - Best of Lot

Are you a writer looking to make some extra cash on the side? Or are you a full-time freelance writer looking for new platforms to expand your portfolio and find more clients? Look no further! Here are 10 platforms that can help you earn money as a freelance writer. Freelance writing is a great way to earn money on the side or even as a full-time career. With the rise of the internet and the increasing demand for content, there are now many platforms that connect businesses with freelance writers.

In this article, we will introduce you to 10 platforms that can help you earn money as a freelance writer. Whether you are a beginner looking for your first writing gig or an experienced writer looking for new opportunities, these platforms have something to offer.

How to call REST API an send HTTP GET and POST Request using cURL command in Linux? Example Tutorial

The curl or cURL command of Linux is a compelling and versatile command which allows you to send sophisticated HTTP requests right from your Linux command line window. You can use the cURL command to test your RESTful Web Services by sending GET and POST requests, doing authentication, saving a cookie in the file, etc. The curl command is, in fact, the go-to tool for many Java and Spring developers working in web applications and consuming data from the secured RESTful Web Services. Still, you can also use it to test your simple REST Web APIs without security. I have used it many times to check if our Web service is up or not, or is there any error while accessing those services.

Top 10 Courses to Learn Artificial Intelligence for Beginners in 2025 - Best of Lot

Artificial Intelligence (AI) is transforming industries and revolutionizing the way we live and work. To stay ahead in this rapidly evolving field, it is crucial to continually update your knowledge and skills. Fortunately, Udemy and Coursera offer a wide range of courses that provide comprehensive training in various aspects of AI. In this article, we have curated a list of the top 10 courses on Udemy and Coursera in 2025, each with an expansive description. We will also provide essential details such as course duration, instructor information, course fee, and course rating. Whether you are a beginner or an experienced professional, these courses will equip you with the necessary tools to excel in the field of AI.

How to Create Config Server in Microservices Architecture with Spring Cloud Config Server

The ability of microservices architecture to deconstruct big monolithic programmes into smaller, independent, and controllable services has led to its enormous growth in popularity in recent years. It can be difficult to manage configuration across numerous microservices, though, as each service may call for a separate set of configurations. To solve this problem, configurations for microservices are centralised and managed by a separate Config Server. In this post, we'll examine what a Config Server is, why it's crucial for microservices, and how to use Spring Cloud Config Server to construct it.

Top 10 AI Tools for Bloggers and Writers in 2025

Artificial Intelligence (AI) has revolutionized various industries, and the field of writing and blogging is no exception. AI-powered tools for bloggers and writers have emerged, offering innovative solutions to enhance creativity, streamline workflows, and improve content quality. In this article, we present the top 10 AI tools specifically designed for bloggers and writers. These tools leverage AI technologies such as natural language processing, machine learning, and data analytics to help writers generate ideas, improve grammar, enhance productivity, and optimize content for better engagement. Let's explore these cutting-edge AI tools and discover how they can empower bloggers and writers.

What is Payload in REST API? How to send Payload using HTTP Post Request and HttpClient

Hello and welcome to the blog post. In this comprehensive article we are going to take a look at an interesting topic. I’m sure you all are familiar with client-server architecture. If not let me recap it quickly for you.

A Client is a machine (or a web-browser) that request for desired results from the server. In other words, clients initiate requests for services or resources, while servers provide those services or resources upon request. The client-server model forms the foundation of many networked applications and systems, where clients and servers communicate and collaborate to fulfill various tasks and deliver services.

What is a Payload?

When a client sends a request to a server, the payload typically contains the data or parameters required by the server to process the request. For example, in a client-server architecture for a web application, the payload of an HTTP request sent by the client may include parameters for a form submission, JSON data for an API request, or a file to be uploaded.

On the server side, when the server sends a response back to the client, the payload contains the data or information requested by the client. This can include HTML content, JSON responses, file attachments, or any other data relevant to the specific request made by the client.

Payload in REST API

The information supplied in the body of an HTTP request is referred to as a payload in the RESTful API architecture. It represents the data that is being sent from the client to the server or the other way around. Depending on the content type supplied in the request headers, the payload may be in one of several forms, including JSON, XML, or plain text.

The payload carries the necessary data required to perform operations on the server or to retrieve specific resources. For example, when creating a new resource, the payload would typically contain the data that needs to be stored on the server. When updating an existing resource, the payload would include the modified data.

What is an HttpClient?

HttpClient is a powerful Java package that offers quick and efficient way for submitting HTTP requests and receiving server responses. Starting with Java 11, it is a part of the Java SE standard library and offers a comprehensive API for interacting with HTTP-based services.

HttpClient's main objective is to make it easier for client applications to communicate with RESTful APIs, web services, and other HTTP-based endpoints. The low-level aspects of creating and managing connections, dealing with request and response bodies, modifying headers, controlling timeouts, and dealing with redirection are abstracted away.

You can perform various HTTP operations like GET, POST, PUT, DELETE by using HttpClient. It supports both synchronous and asynchronous request processing and offers a number of configuration options for customization.

Let’s take an example on how to send a POST request to REST API using HttpClient

import com.fasterxml.jackson.databind.ObjectMapper;

import java.net.URI;

import java.net.http.HttpClient;

import java.net.http.HttpRequest;

import java.net.http.HttpResponse;

import java.net.http.HttpHeaders;

import java.net.http.HttpResponse.BodyHandlers;

public class HttpClientExample {

public static void main(String[] args) throws Exception {

// Create an instance of HttpClient

HttpClient httpClient = HttpClient.newHttpClient();

// Define the URL of the REST API endpoint

String url = "http://api.example.com/users";

// Create a User object

User user = new User("John Doe", 30);

// Serialize the User object to JSON

ObjectMapper objectMapper = new ObjectMapper();

String requestBody = objectMapper.writeValueAsString(user);

// Build the HTTP request

HttpRequest request = HttpRequest.newBuilder()

.uri(URI.create(url))

.header("Content-Type", "application/json")

.POST(HttpRequest.BodyPublishers.ofString(requestBody))

.build();

// Send the request and receive the response

HttpResponse<String> response = httpClient.send(request, BodyHandlers.ofString());

// Extract the User object from the response

String responseBody = response.body();

User responseUser = objectMapper.readValue(responseBody, User.class);

// Print the response User object

System.out.println("Response User: " + responseUser);

}

class User {

private String name;

private int age;

// Constructors, getters, and setters

@Override

public String toString() {

return "User{" +

"name='" + name + '\'' +

", age=" + age +

'}';

}

In this example, we have a User class representing the user object. We use the ObjectMapper from the Jackson library to serialize the User object to JSON format.

We then create an HttpRequest object with the necessary details, including the URI, headers (in this case, "Content-Type" is set to "application/json"), and the request body containing the serialized User object.

After sending the request using httpClient.send(), we receive the response as an HttpResponse object. We extract the response body as a JSON string.

Finally, we deserialize the response JSON string back into a User object using objectMapper.readValue(). The resulting User object represents the response payload, which we can use as needed.

Sending Payload to REST API using HTTP POST Request and HttpClient in Java

import java.net.URI;

import java.net.http.HttpClient;

import java.net.http.HttpRequest;

import java.net.http.HttpResponse;

import java.net.http.HttpHeaders;

import java.net.http.HttpEntity;

import java.net.http.HttpHeaders;

import java.net.http.HttpRequest.BodyPublishers;

import java.net.http.HttpResponse.BodyHandlers;

public class HttpClientExample {

public static void main(String[] args) throws Exception {

HttpClient httpClient = HttpClient.newHttpClient();

String jsonPayload = "{\"name\": \"Someone \", \"email\": \"someone@example.com\"}";

HttpRequest request = HttpRequest.newBuilder()

.uri(URI.create("http://example.com/api/resource"))

.header("Content-Type", "application/json")

.POST(BodyPublishers.ofString(jsonPayload))

.build();

HttpResponse<String> response = httpClient.send(request, BodyHandlers.ofString());

int statusCode = response.statusCode();

String responseBody = response.body();

System.out.println("Status Code: " + statusCode);

System.out.println("Response Body: " + responseBody);

}

In the example above, we create a JSON payload using a sample data object. We set the HTTP method to POST, the request URL to "http://example.com/api/resource", and the content type to "application/json". The payload is then sent in the body of the request using the BodyPublishers.ofString() method.

Finally, we retrieve and handle the response from the server.

Remember to replace "http://example.com/api/resource" with the actual endpoint URL of the REST API you want to send the payload to, and modify the payload data according to your requirements and the API's expected format.

Let me show you how to send other types of payloads from the following example.

1) Sending a Form-UrlEncoded Payload

import java.net.URI;

import java.net.http.HttpClient;

import java.net.http.HttpRequest;

import java.net.http.HttpResponse;

import java.net.http.HttpHeaders;

import java.net.http.HttpEntity;

import java.net.http.HttpHeaders;

import java.net.http.HttpRequest.BodyPublishers;

import java.net.http.HttpResponse.BodyHandlers;

import java.net.URLEncoder;

import java.nio.charset.StandardCharsets;

public class HttpClientExample {

public static void main(String[] args) throws Exception {

HttpClient httpClient = HttpClient.newHttpClient();

String payload = "name=" + URLEncoder.encode("John Doe", StandardCharsets.UTF_8)

+ "&email=" + URLEncoder.encode("johndoe@example.com", StandardCharsets.UTF_8);

HttpRequest request = HttpRequest.newBuilder()

.uri(URI.create("http://example.com/api/resource"))

.header("Content-Type", "application/x-www-form-urlencoded")

.POST(BodyPublishers.ofString(payload))

.build();

HttpResponse<String> response = httpClient.send(request, BodyHandlers.ofString());

int statusCode = response.statusCode();

String responseBody = response.body();

System.out.println("Status Code: " + statusCode);

System.out.println("Response Body: " + responseBody);

}

In this example, we are sending a form-urlencoded payload to the REST API endpoint "http://example.com/api/resource". The payload contains two fields, name and email, which are URL-encoded using the URLEncoder.encode() method. The Content-Type header is set to "application/x-www-form-urlencoded".

2) Sending a Plain Text Payload

import java.net.URI;

import java.net.http.HttpClient;

import java.net.http.HttpRequest;

import java.net.http.HttpResponse;

import java.net.http.HttpHeaders;

import java.net.http.HttpEntity;

import java.net.http.HttpHeaders;

import java.net.http.HttpRequest.BodyPublishers;

import java.net.http.HttpResponse.BodyHandlers;

public class HttpClientExample {

public static void main(String[] args) throws Exception {

HttpClient httpClient = HttpClient.newHttpClient();

String textPayload = "This is a plain text payload.";

HttpRequest request = HttpRequest.newBuilder()

.uri(URI.create("http://example.com/api/resource"))

.header("Content-Type", "text/plain")

.POST(BodyPublishers.ofString(textPayload))

.build();

HttpResponse<String> response = httpClient.send(request, BodyHandlers.ofString());

int statusCode = response.statusCode();

String responseBody = response.body();

System.out.println("Status Code: " + statusCode);

System.out.println("Response Body: " + responseBody);

}

In this example, we are sending a plain text payload to the REST API endpoint "http://example.com/api/resource". The payload simply contains the text "This is a plain text payload." The Content-Type header is set to "text/plain" to indicate that the payload is in plain text format.

Summary

In summary, sending a payload to a REST API using an HTTP POST request and HttpClient in Java involves creating an HTTP request with the desired payload, specifying the necessary headers, and sending the request using the HttpClient instance. The server will process the payload and provide a response, which can be accessed and utilized accordingly.

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Pages

What is a Payload?

Payload in REST API

What is an HttpClient?

Sending Payload to REST API using HTTP POST Request and HttpClient in Java

1) Sending a Form-UrlEncoded Payload

2) Sending a Plain Text Payload