JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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How to read header parameters in JAX-RS restful web services?


In this page you can see an example to query http header info using @Context annotation and HttpHeaders.

In the previous examples we have given details of application setup, dependencies, web.xml file configurations: If you want to know about these configuration, please refer these:

Restful web services using RESTEasy hello world example.
Restful web services using Jersey hello world example.

package com.java2novice.restful;

import java.util.Set;

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("/http-header")
public class HttpHeaderService {

	@GET
	@Path("query")
	public Response queryHeaderInfo(@Context HttpHeaders httpHeaders){
		
		/** how to get specific header info? **/
		String cacheControl = httpHeaders.getRequestHeader("Cache-Control").get(0);
		System.out.println("Cache-Control: "+cacheControl);
		/** get list of all header parameters from request **/
		Set<String> headerKeys = httpHeaders.getRequestHeaders().keySet();
		for(String header:headerKeys){
			System.out.println(header+":"+httpHeaders.getRequestHeader(header).get(0));
		}
		return Response.status(200).entity("successfully queried header info").build();
	} 
}

Test with "http://localhost:8080/RestfulWebServices/http-header/query" URL, here is the output:

Output:
Cache-Control: max-age=0
[stdout] (http--127.0.0.1-8080-1) host:localhost:8080
[stdout] (http--127.0.0.1-8080-1) connection:keep-alive
[stdout] (http--127.0.0.1-8080-1) cache-control:max-age=0
[stdout] (http--127.0.0.1-8080-1) accept:text/html,application/xhtml+xml,application/xml;q=0.9,
						image/webp,*/*;q=0.8
[stdout] (http--127.0.0.1-8080-1) user-agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.36 
						(KHTML, like Gecko) Chrome/38.0.2125.104 Safari/537.36
[stdout] (http--127.0.0.1-8080-1) accept-encoding:gzip,deflate,sdch
[stdout] (http--127.0.0.1-8080-1) accept-language:en-US,en;q=0.8
[stdout] (http--127.0.0.1-8080-1) cookie:__atuvc=24%7C23%2C0%7C24%2C3%7C25%2C45%7C26%2C41%7C27; 
						bsau=14136427273262128776
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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
What is race condition?
A race condition is a situation in which two or more threads or processes are reading or writing some shared data, and the final result depends on the timing of how the threads are scheduled. Race conditions can lead to unpredictable results and subtle program bugs. A thread can prevent this from happening by locking an object. When an object is locked by one thread and another thread tries to call a synchronized method on the same object, the second thread will block until the object is unlocked.
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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].

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