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JavaInterviewPoint

Java Development Tutorials

JAX-RS @DefaultValue Example

April 22, 2015 by javainterviewpoint Leave a Comment

In our previous example we have learnt how to get the values using @QueryParam Annotation, now we will learn the usage of @DefaultValue annotation with @QueryParam. @DefaultValue is used to set a default value to the query param even when the parameters are not passed.

Folder Structure

  1. Create a Dynamic Web Project Restful_Example and create a package for our src files “com.javainterviewpoint“
  2. Place the required jar files under WEB-INF/Lib 

    jersey-bundle-1.18.jar
    asm-3.1.jar

  3. Create the Java classes DefaultValueExample.java under  com.javainterviewpoint folder.
  4. Place the web.xml  under the WEB-INF directory

@Context Example

import javax.ws.rs.DefaultValue;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.Response;

@Path("/DefaultValueExample")
public class DefaultValueExample 
{
    @GET
    public Response getQueryParameters(
            @DefaultValue("param1")@QueryParam("parameter1")String parameter1,
            @DefaultValue("param2")@QueryParam("parameter2")String parameter2)
    {
        
        String output = "Parameter1 :"+parameter1+" Parameter2 : "+parameter2;
        return Response.status(200).entity(output).build();
    }
}

Hit on the RESTful URI :

http://localhost:8080/RESTful_Example/rest/DefaultValueExample

Output

Parameter1 :param1 Parameter2 : param2

When we pass the parameters like below then the default values will be replaced with the one which we pass

http://localhost:8080/RESTful_Example/rest/DefaultValueExample?parameter1=”Java”&parameter2=”Interview”

Output

Parameter1 :"Java" Parameter2 : "Interview"

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:web="http://xmlns.jcp.org/xml/ns/javaee"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee	
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd	
	http://java.sun.com/xml/ns/j2ee	
	http://java.sun.com/xml/ns/j2ee/web-app_2_5.xsd"
	id="WebApp_ID" version="2.5">
	<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>com.javainterviewpoint</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>

We register our jersey container “com.sun.jersey.spi.container.servlet.ServletContainer” in the servlet-class of our web.xml and we will mention the source files location as the value to the init param “com.sun.jersey.config.property.packages” so that the container will scan for annotations of the class files within that package.

Other interesting articles which you may like …

  • JAX-RS Jersey Hello World Example
  • JAX-RS @PathParam Example
  • JAX-RS @Path URI Matching Example
  • Jersey RESTful Web Services Client – Getting List of Object (GenericType)
  • Jersey Jackson JSON Tutorial
  • JAX-RS @Context Example
  • JAX-RS REST @MatrixParam Example
  • JAX-RS REST @FormParam Example
  • JAX-RS REST @Produces Example
  • JAX-RS REST @Consumes Example
  • JAX-RS REST @Produces both XML and JSON Example
  • JAX-RS REST @Consumes both XML and JSON Example
  • RESTful Java Client With Jersey Client
  • RESTEasy Hello World Example with Apache Tomcat
  • RESTful Java client with RESTEasy client
  • Spring RESTful Web Services Hello World XML Example
  • Springfox Swagger 2 for Spring RESTful Web Services

Filed Under: J2EE, Java, JAX-RS, REST Tagged With: @DefaultValue, JAX-RS, Rest

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