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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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Restful Web Services Examples

  1. Restful web services using RESTEasy hello world example.
  2. Restful web services using Jersey hello world example.
  3. JAX-RS @Path annotation example
  4. JAX-RS @Path annotation with regular expression match example
  5. JAX-RS @PathParam annotation example
  6. JAX-RS @QueryParam and @DefaultValue annotations example
  7. JAX-RS @MatrixParam annotation example
  8. How to read multiple values of a query paramter in JAX-RS restful web services?
  9. How to pass header parameters as method inputs in JAX-RS restful web services?
  10. How to read header parameters in JAX-RS restful web services?
  11. JAX-RS @FormParam annotation example
  12. How to upload file using Jersey restful web services?
  13. How to download file using java restful web services?
  14. XML based Restful web service with RESTEasy and JAXB.
  15. XML based Restful web service with Jersey and JAXB.
  16. Json based Restful web service with RESTEasy, Jettison and JAXB
  17. Json based Restful web service with RESTEasy and Jackson
  18. Json based Restful web service with Jersey and Jackson
  19. How to input json request with Jersey and Jackson?
  20. Java client for restful web service using java.net package
  21. Java client for restful web service using Jersey API
  22. Java restful webservices with HTTP basic authentication.
Knowledge Centre
Preemptive scheduling Vs Time slicing?
Preemptive scheduling: The highest priority task executes until it enters the waiting or dead states or a higher priority task comes into existence.

Time slicing: A task executes for a predefined slice of time and then reenters the pool of ready tasks. The scheduler then determines which task should execute next, based on priority and other factors.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected] or you can comment on the page.

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