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Saturday, 30 November 2013

JAX-RS Get HTTP Headers using @Context


In this tutorial we are going to see how to get HTTP request header using JAX-RS  RESTful web service @Context
1. Create new Dynamic web project by choosing File –> New –> Dynamic Web Project .
2. Create the Project called RESTful-WebService
3. Add the following jar into WEF-INF/lib folder
add jar
4. Create package called com.javatutorialscorner.jaxrs.httpheader under RESTful-WebService
5. Create Java class HTTPHeaderService2 under com.javatutorialscorner.jaxrs.httpheader package
HTTPHeaderService2.java
package com.javatutorialscorner.jaxrs.httpheader;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.Response;

@Path("/tutorial")
public class HTTPHeaderService2 {

@GET
@Path("/java-tutorial-corner")
public Response getTutorial(@Context HttpHeaders httpHeaders) {
String userAgent = httpHeaders.getRequestHeader("user-agent").get(0);
return Response
.status(200)
.entity("User Agent Details : " + userAgent).build();
}
}

6.Configure Jersey Servlet Dispatcher
you need to configure REST as servlet in web.xml.
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/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>JAX-RS-Path</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.javatutorialscorner.jaxrs.httpheader</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>

The servlet class available in jersey com.sun.jersey.spi.container.servlet.ServletContainer. The init param com.sun.jersey.config.property.package is used to define in which package jersey will look for the service classes.This package points to your resource class package. URL pattern is the part of base URL

Now you can run the service and access the service by calling the following URL

http://localhost:8080/RESTful-WebService/rest/tutorial/java-tutorial-corner/

Output
output

Note : in this tutorials I used user-agent alone. You can access all http headers using @Context
Annamalai Thangaraj

Annamalai is working as Technical Lead in Leading Telecom company with 5+ years experience in Identity and Access Management , Telecom and Networks, BigData, Java, Spring, Struts, Hibernate, AngularJS, and Enterprise Web Application Development.

Website: Java Tutorials Corner

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Item Reviewed: JAX-RS Get HTTP Headers using @Context Rating: 5 Reviewed By: Annamalai Thangaraj