In this post i will explain you how to capture http-request header in JAX-RS.
- Using @HeaderParam
- Using @Context
###@HeaderParam Example
In this example we can have only the selected attribute we want , JAX-RS will have filter internally and return you the selected Attributes
import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MediaType;
import org.apache.log4j.Logger;
public class RequestHandler
{
Logger logger = Logger.getLogger(RequestHandler.class);
private DataServiceController dataServiceController;
@Path("/ready")
@GET
@Produces(MediaType.TEXT_HTML)
public boolean ready(@HeaderParam("user-agent") String userAgent)
{
logger.info("User Agent : " + userAgent);
return true;
}
}
This will going to print below output :
User Agent : Mozilla/5.0 (Windows NT 6.1) AppleWebKit/534.30 (KHTML, like Gecko) Chrome/12.0.742.112 Safari/534.30@Context Example
@Context gives you the whole damn Request Header
import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MediaType;
import org.apache.log4j.Logger;
public class RequestHandler
{
Logger logger = Logger.getLogger(RequestHandler.class);
private DataServiceController dataServiceController;
@Path("/ready")
@GET
@Produces(MediaType.TEXT_HTML)
public boolean ready(@Context HttpHeaders headers)
{
for(String header : headers.getRequestHeaders().keySet()){
System.out.print(header + "==> ");
for (String value : headers.getRequestHeader(header)) {
System.out.print(value + ":");
}
System.out.println();
}
return true;
}
}This will going to print below output :
Accept==> text/html:application/xhtml+xml:application/xml;q=0.9:*/*;q=0.8:
accept-encoding==> gzip:deflate:
accept-language==> en-US:en;q=0.5:
connection==> keep-alive:
Content-Type==>
host==> localhost:8080:
user-agent==> Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:25.0) Gecko/20100101 Firefox/25.0:Happy Coding .. :)
