SatyaCodes

WebServices- JAX-RS JSON

JAX-RS JSON Example Using Jersey

Jersey uses Jackson to convert object to / form JSON. In this example, we show you how to convert a -user” object into JSON format, and return it back to user

Steps to Implement this Web Service Application

1. Create Dynamic web project in eclipse, convert that into Maven Project

2. Configure pom.xml

To make Jersey support JSON mapping, declares -jersey-json.jar” in Maven pom.xml file.

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>JAX-RS-JSON_Example-Jersey</groupId>
  <artifactId>JAX-RS-JSON_Example-Jersey</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <build>
    <sourceDirectory>src</sourceDirectory>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.5.1</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>3.0.0</version>
        <configuration>
          <warSourceDirectory>WebContent</warSourceDirectory>
        </configuration>
      </plugin>
    </plugins>
  </build>
  
  <repositories>
 <repository>
 	<id>maven2-repository.java.net</id>
 	<name>Java.net Repository for Maven</name>
 	<url>http://download.java.net/maven/2/</url>
 	<layout>default</layout>
 </repository>
	</repositories>

	<dependencies>
	

 <dependency>
 	<groupId>com.sun.jersey</groupId>
 	<artifactId>jersey-server</artifactId>
 	<version>1.8</version>
 </dependency>

 <dependency>
 	<groupId>com.sun.jersey</groupId>
 	<artifactId>jersey-json</artifactId>
 	<version>1.8</version>
 </dependency>

	</dependencies>
</project>

3.Configure web.xml

In web.xml, declares -com.sun.jersey.api.json.POJOMappingFeature" as -init-param" in Jersey mapped servlet. It will make Jersey support JSON/object mapping.

<web-app id="WebApp_ID" version="2.4"
	xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
	http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
	<display-name>Restful Web Application</display-name>

	<servlet>
 <servlet-name>jersey-serlvet</servlet-name>
 <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
 <init-param>
 	<param-name>com.sun.jersey.config.property.packages</param-name>
 	<param-value>rest.service</param-value>
 </init-param>
 <init-param>
 	<param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
 	<param-value>true</param-value>
 </init-param>
 <load-on-startup>1</load-on-startup>
	</servlet>

	<servlet-mapping>
 <servlet-name>jersey-serlvet</servlet-name>
 <url-pattern>/rest/*</url-pattern>
	</servlet-mapping>

</web-app>

4. Write -UserBo” class

Write -UserBo” class object, Jersey will convert this object into JSON format.

package services;

public class UserBo {
	String username;
	String password;

	public String getUsername() {
 return username;
	}

	public void setUsername(String username) {
 this.username = username;
	}

	public String getPassword() {
 return password;
	}

	public void setPassword(String password) {
 this.password = password;
	}

	@Override
	public String toString() {
 // TODO Auto-generated method stub
 return "User [username=" + username + ", password=" + password + "]";
	};
}

5. Create RESTFul webservice Jersey
Annotate the method with @Produces(MediaType.APPLICATION_JSON). Jersey will use Jackson to handle the JSON conversion automatically.

package rest.service;

@Path("/json")
public class JSONService {
	@GET
	@Path("/getjson")
	@Produces(MediaType.APPLICATION_JSON)
	public UserBo getboInJSON() {

 UserBo bo = new UserBo();
 bo.setUsername("satyakaveti@gmail.com");
 bo.setPassword("XCersxg34CXeWER341DS@#we");
 return bo;
	}

}

6. Test Webservice directly by using URL / writing webservice client

http://localhost:8080/JAX-RS-JSON_Example-Jersey/json/getjson

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