JAX-RS JSON example

• Server.java
• User.java
• web.xml
• context.xml
• RestClient.java
• pom.xml

Server.java

package com.training;

import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

@Path("/user")
public class Server {

    @GET
    @Path("/get")
    @Produces(MediaType.APPLICATION_JSON)
    public User getUser() {
        return new User("userName", 10);
    }

    @POST
    @Path("/post")
    @Consumes(MediaType.APPLICATION_JSON)
    public Response postUser(User user) {
        String result = "User added: " + user;
        return Response.status(Response.Status.CREATED).entity(result).build();
    }

}

User.java

package com.training;

public class User {

    private String name;
    private int age;

    public User() {
    }

    public User(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "User{" + "name=" + name + ", age=" + age + '}';
    }

}

web.xml

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0">

    <display-name>JAX-RS Web Application</display-name>

    <servlet>
        <servlet-name>Jersey REST Service</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>com.training</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 REST Service</servlet-name>
        <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>

</web-app>

context.xml

<?xml version="1.0" encoding="UTF-8"?>
<Context antiJARLocking="true" path="/jax_rs_json_example"/>

RestClient.java

package com.training;

import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
import javax.ws.rs.core.MediaType;

public class RestClient {

    public static void main(String[] args) {
        RestClient client = new RestClient();
        client.getRequest();
        client.postRequest();
    }

    private void getRequest() {
        Client client = Client.create();
        WebResource webResource = client.resource("http://localhost:8080/jax_rs_json_example/rest/user/get");
        ClientResponse response = webResource.accept(MediaType.APPLICATION_JSON).get(ClientResponse.class);
        System.out.println("Status: " + response.getStatus());
        System.out.println("Response: " + response.getEntity(String.class));
    }

    private void postRequest() {
        Client client = Client.create();
        WebResource webResource = client.resource("http://localhost:8080/jax_rs_json_example/rest/user/post");
        String inputData = "{\"name\":\"newUserName\",\"age\":23}";
        ClientResponse response = webResource.type(MediaType.APPLICATION_JSON).post(ClientResponse.class, inputData);
        System.out.println("Status: " + response.getStatus());
        System.out.println("Response: " + response.getEntity(String.class));
    }

}

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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>com.training</groupId>
    <artifactId>jax_rs_json_example</artifactId>
    <version>1.0</version>
    <packaging>war</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
        <jersey.version>1.19</jersey.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-core</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-servlet</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-json</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-client</artifactId>
            <version>${jersey.version}</version>
        </dependency>
    </dependencies>

</project>