JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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How to input json request with Jersey and Jackson?


In this page you will see support for Json using Jersey and Jackson APIs. Jackson is is a multi-purpose Java library for processing JSON data format. Jackson aims to be the best possible combination of fast, correct, lightweight, and ergonomic for developers In this example we will send json as a input, and the json request will be mapped to Order object.

Here is the pom.xml file. You need jersey-json jar file.

<?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>RestfulWebServices</groupId>
	<artifactId>RestfulWebServices</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>war</packaging>
	<dependencies>
		<dependency>
			<groupId>com.sun.jersey</groupId>
			<artifactId>jersey-server</artifactId>
			<version>1.17</version>
		</dependency>
		<dependency>
			<groupId>com.sun.jersey</groupId>
			<artifactId>jersey-servlet</artifactId>
			<version>1.17</version>
		</dependency>
		<dependency>
			<groupId>com.sun.jersey</groupId>
			<artifactId>jersey-json</artifactId>
			<version>1.17</version>
		</dependency>
	</dependencies>
</project>

Web.xml file for your reference. In web.xml add “com.sun.jersey.api.json.POJOMappingFeature” as “init-param” which supports 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">
	    
   <servlet>
		<servlet-name>jersey-serlvet</servlet-name>
		<servlet-class>
           com.sun.jersey.spi.container.servlet.ServletContainer
		</servlet-class>
		<init-param>
		    <param-name>jersey.config.server.provider.packages</param-name>
		    <param-value>com.java2novice.restful</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>/*</url-pattern>
	</servlet-mapping>
</web-app>

Our model class Order is annotated with required jackson annoations to support json transformation:

package com.java2novice.model;

import org.codehaus.jackson.annotate.JsonProperty;

public class Order {

	@JsonProperty
	private String custmer;
	
	private String address;
	
	@JsonProperty("bill-amount")
	private String amount;
	
	public String getCustmer() {
		return custmer;
	}
	public void setCustmer(String custmer) {
		this.custmer = custmer;
	}
	
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	
	public String getAmount() {
		return amount;
	}
	public void setAmount(String amount) {
		this.amount = amount;
	}
	
}

Remember that our restful web service API accepting json as an input, we should annotate our service method with @Consumes and specify MIME type as application/jon. Closely watch our service method input parameter, it is of type Order, before calling our service method, the json is mapped to Order object.

package com.java2novice.restful;

import javax.ws.rs.Consumes;
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;

import com.java2novice.model.Order;
	
	@POST
	@Path("/order")
	@Consumes(MediaType.APPLICATION_JSON)
	public Response getUserById(Order inputOrder){
		
		System.out.println("Received order from :"+inputOrder.getCustmer());
		System.out.println("Order worth: "+inputOrder.getAmount());
		System.out.println("Customer address: "+inputOrder.getAddress());
		
		return Response.status(200).entity("Your order is in-progress").build();
	}
}

Here is the json requst and response:

The console output:


Output:
[stdout] (http--127.0.0.1-8080-1) Received order from :Java2Novice
[stdout] (http--127.0.0.1-8080-1) Order worth: $2000
[stdout] (http--127.0.0.1-8080-1) Customer address: Bangalore
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Knowledge Centre
Different types of Access Modifiers
public: Any thing declared as public can be accessed from anywhere.

private: Any thing declared as private can't be seen outside of its class.

protected: Any thing declared as protected can be accessed by classes in the same package and subclasses in the other packages.

default modifier: Can be accessed only to classes in the same package.
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