JAX-RS Hello Word Programe

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JAX-RS is used to make Rest Api , in this tutorial we make a Hello Word Programe Using JAX-RS

For creating JAX-RS we have Use the Net Beans IDE and use the following steps:

1– Create a maven web project

( File -> New Project -> Maven -> Web Project)

2– Add This two Depenedency in your pom.xml

 

<dependency>

        <groupId>org.glassfish.jersey.core</groupId>

        <artifactId>jersey-server</artifactId>

        <version>2.25</version>

</dependency>

<dependency>

         <groupId>org.glassfish.jersey.containers</groupId>

         <artifactId>jersey-container-servlet-core</artifactId>

         <version>2.25</version>

</dependency>

NOTE: You can download this dependency from https://mvnrepository.com/  website

3– Edit your web.xml  and write jersey configuration inside that

In this project we use the following annotations

@Path

@GET

 @Path :  @path annotation is used to describe the url for our application

Example :       @Path(“firstJerseyPrograme”)

@GET : Get annotation describe that this is the get request this request is used only for read data

 

Now start coding and use the follow steps

1- Create Maven Web Project and Add The above Describe dependency in your pom.xml inside <dependencies></dependencies> tag

pom.xml

      <dependencies>

                     <dependency>

                         <groupId>javax</groupId>

                        <artifactId>javaee-web-api</artifactId>

                         <version>7.0</version>

                        <scope>provided</scope>

                   </dependency>

                  <dependency>

                         <groupId>org.glassfish.jersey.core</groupId>

                         <artifactId>jersey-server</artifactId>

                         <version>2.25</version>

                   </dependency>

        <dependency>

            <groupId>org.glassfish.jersey.containers</groupId>

            <artifactId>jersey-container-servlet-core</artifactId>

            <version>2.25</version>

        </dependency>

    </dependencies>

 

2- Edit your web.xml and add the following code inside that for create jersey endpoints

<servlet>

<servlet-name>Jersey Web Application</servlet-name>

<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>

<init-param>

<param-name>jersey.config.server.provider.packages</param-name>

<param-value>com.vasu.jerseyrest</param-value>

</init-param>

<load-on-startup>1</load-on-startup>

</servlet>

<servlet-mapping>

<servlet-name>Jersey Web Application</servlet-name>

<url-pattern>/rest/*</url-pattern>

</servlet-mapping>

NOTE : Please define   <param-value>  </param-value> value correctly it will be your package name.

 

3- Create Java Class inside the package  that you define inside the <param-value>  </param-value>  tag, i have created the class with name HelloWord.java

HelloWord.java :

 

package com.vasu.jerseyrest;

import javax.ws.rs.GET;

import javax.ws.rs.Path;

@Path(“firstJerseyPrograme”)

public class HelloWord {

@GET

public String a(){

return “hello JavaDream”;

}

}

 

4- Now Run Your Project

( Right Click On Project -> Run )

5- Enter The Url In Browser

http://localhost:8080/JerseyRest/rest/firstJerseyPrograme

http://localhost:8080/ -> Your localhost

JerseyRest -> Your Project Name

rest ->  value that you define between <url-pattern></url-pattern> tag you can define any name there and user the same name in url

firstJerseyPrograme -> it is the name of path that you define in  your class                                                                                              @Path(“firstJerseyPrograme”)

 

 

 

 

 

 

 

 

 

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