Book Image

Developing Java Applications with Spring and Spring Boot

By : Claudio Eduardo de Oliveira, Greg L. Turnquist, Alex Antonov
Book Image

Developing Java Applications with Spring and Spring Boot

By: Claudio Eduardo de Oliveira, Greg L. Turnquist, Alex Antonov

Overview of this book

Spring Framework has become the most popular framework for Java development. It not only simplifies software development but also improves developer productivity. This book covers effective ways to develop robust applications in Java using Spring. The course is up made of three modules, each one having a take-away relating to building end-to-end java applications. The first module takes the approach of learning Spring frameworks by building applications.You will learn to build APIs and integrate them with popular fraemworks suh as AngularJS, Spring WebFlux, and Spring Data. You will also learn to build microservices using Spring's support for Kotlin. You will learn about the Reactive paradigm in the Spring architecture using Project Reactor. In the second module, after getting hands-on with Spring, you will learn about the most popular tool in the Spring ecosystem-Spring Boot. You will learn to build applications with Spring Boot, bundle them, and deploy them on the cloud. After learning to build applications with Spring Boot, you will be able to use various tests that are an important part of application development. We also cover the important developer tools such as AMQP messaging, websockets, security, and more. This will give you a good functional understanding of scalable development in the Spring ecosystem with Spring Boot. In the third and final module, you will tackle the most important challenges in Java application development with Spring Boot using practical recipes. Including recipes for testing, deployment, monitoring, and securing your applications. This module will also address the functional and technical requirements for building enterprise applications. By the end of the course you will be comfortable with using Spring and Spring Boot to develop Java applications and will have mastered the intricacies of production-grade applications.
Table of Contents (34 chapters)
Title Page - Courses
Copyright and Credits - Courses
Packt Upsell - Courses

Testing APIs

Our container is running. Now, we can try to call the APIs to check the behaviors. In this part, we will use the curl command line. The curl allows us to call APIs by the command line on Linux. Also, we will use jq to make the JSON readable on the command line, if you do not have these, look at the Tip Box to install these tools.

Let's call our create API, remember to create we can use the POST method in the base path of API. Then type the following command:

curl -H "Content-Type: application/json" -X POST -d '{"hashTag":"java","queue":"java"}' 

There are interesting things here. The -H argument instructs curl to put it in the request headers and -d indicates the request body. Moreover, finally, we have the server address.

We have created the new tracked-hash-tag. Let's check our GET API to obtain this data:

curl 'http://localhost:9090/api/tracked-hash-tag' | jq '.'

Awesome, we called the curl tool and printed the JSON value with the jq...