{"id":106762,"date":"2020-09-13T15:15:00","date_gmt":"2020-09-13T12:15:00","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=106762"},"modified":"2020-09-11T09:21:52","modified_gmt":"2020-09-11T06:21:52","slug":"developing-a-simple-service-with-spring-boot","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2020\/09\/developing-a-simple-service-with-spring-boot.html","title":{"rendered":"Developing a Simple Service with Spring Boot"},"content":{"rendered":"

In this post, I will demonstrate how to create a simple web service using Spring Boot.  This framework makes it almost effortless to develop web services, so long as the appropriate dependencies are in-place.  In this example, I will create a web service that will read the current temperature from a file and make it available to clients via a RESTful endpoint.<\/p>\n

The Spring Initializr helps one to choose the dependencies that are required for production a particular solution.  The Initializr can be found at: https:\/\/start.spring.io\/<\/a>  <\/p>\n

The first thing to note when creating a project using the Initializr is that one can develop Spring Boot applications using a number of different JVM languages, including Java, Kotlin, or Groovy.  This is one area where Spring Boot differs from Jakarta EE, which is primarily focused on the Java language.  One also has the option to choose either Gradle or Maven for their Spring Boot project.  Perhaps one of the most tedious parts of using the Initialzr to create a project is choosing the appropriate dependencies for the project.  The reason being that there are so many dependency options, it can take a while to learn which are the most useful for a particular solution.  This is not a bad thing…it is just something that needs to be learned over time.<\/p>\n

To get started, choose the following options within the Initializr:<\/p>\n

Project: Maven<\/p>\n

Language: Java<\/p>\n

Spring Boot: 2.3.3<\/p>\n

Dependencies:  Spring Web<\/p>\n

Project Metadata<\/p>\n

– Group:  org.demo<\/p>\n

– Artifact: poolservice<\/p>\n

– Name: poolservice<\/p>\n

– Package Name:  org.demo.poolservice<\/p>\n

– Packaging:  WAR<\/p>\n

– Java:  11<\/p>\n

Once these options are chosen, click “Generate” to download the project files.  Once downloaded, open the project in your favorite IDE.  In this case, I will be using Apache NetBeans 12.  The project can now be built and deployed to a container, such as Payara server.  The project comes configured and ready to begin adding RESTful services.  The following code shows the generated PoolserviceApplication class, which was created by the Initializr, contains the @SpringBootApplication annotation.  <\/p>\n

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package<\/code> org.demo.poolservice;<\/code><\/div>\n
 <\/div>\n
import<\/code> org.springframework.boot.SpringApplication;<\/code><\/div>\n
import<\/code> org.springframework.boot.autoconfigure.SpringBootApplication;<\/code><\/div>\n
 <\/div>\n
@SpringBootApplication<\/code><\/div>\n
public<\/code> class<\/code> PoolserviceApplication {<\/code><\/div>\n
 <\/div>\n
    <\/code>public<\/code> static<\/code> void<\/code> main(String[] args) {<\/code><\/div>\n
        <\/code>SpringApplication.run(PoolserviceApplication.<\/code>class<\/code>, args);<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
 <\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

The @SpringBootApplication annotation is a shortcut annotation that combines the default functionality of the following three annotations:<\/p>\n