- Inject directly with @HeaderParam
- Pragmatically via @Context
1. @HeaderParam Example
In this example, it gets the browser “user-agent” from request header.
import javax.ws.rs.GET; import javax.ws.rs.HeaderParam; import javax.ws.rs.Path; import javax.ws.rs.core.Response; @Path("/employee") public class EmployeeController { @GET @Path("/get") public Response addEmployee(@HeaderParam("user-agent") String userAgent) { return Response.status(200) .entity("addEmployee is called, userAgent : " + userAgent) .build(); } }
Access via URI pattern “http://localhost:8181/sdnext/doj/employee/get”, with Chrome, see following result :
addEmployee is called, userAgent : Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.110 Safari/537.36
2. @Context Example
Alternatively, you can use @Context to get “javax.ws.rs.core.HttpHeaders” directly, see equivalent version to get browser “user-agent“.
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("/employee") public class EmployeeController { @GET @Path("/get") public Response addEmployee(@Context HttpHeaders headers) { String userAgent = headers.getRequestHeader("user-agent").get(0); return Response.status(200) .entity("addEmployee is called, userAgent : " + userAgent) .build(); } }
Access via URI pattern “http://localhost:8181/sdnext/doj/employee/get”, with Chrome, see following result :
addEmployee is called, userAgent : Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.110 Safari/537.36
References
1. JAVA REST Web Services
2. Wikipedia for REST Web Service