Using Java API for RESTful Web Services (JAX-RS), you can use the HttpHeaders object to access request headers.
By using an injected HttpHeaders object with the JAX-RS runtime environment, the HTTP request headers information is known and available for modification. The @javax.ws.rs.core.Context annotation indicates that a context object is injected. The javax.ws.rs.core.HttpHeaders interface is the interface of the object that you want to inject.
The resource method uses information from the HTTP headers that is sent in the request to determine an appropriate response.
The following example illustrates a resource that returns a different greeting depending on the setting of the Accept-Language header.
import java.util.List; import java.util.Locale; import javax.ws.rs.GET; import javax.ws.rs.Path; import javax.ws.rs.Produces; import javax.ws.rs.core.Context; import javax.ws.rs.core.HttpHeaders; import javax.ws.rs.core.MediaType; @Path("/contexttest") public class HelloWorldInMyLanguage { /** * @return Returns the string in the preferred language. */ @GET @Produces(MediaType.TEXT_PLAIN) public String getGreeting(@Context HttpHeaders httpHeaders) { List<Locale> locales = httpHeaders.getAcceptableLanguages(); if (locales.size() == 0) { return "Hello!"; } Locale locale = locales.get(0); if (locale.equals(Locale.FRENCH)) { return "Bonjour!"; } else if (locale.equals(Locale.GERMAN)) { return "Guten Tag!"; } else { return "Hello!"; } } }
import java.util.List; import java.util.Locale; import javax.ws.rs.GET; import javax.ws.rs.Path; import javax.ws.rs.Produces; import javax.ws.rs.core.Context; import javax.ws.rs.core.HttpHeaders; import javax.ws.rs.core.MediaType; @Path("/contexttest") public class HelloWorldInMyLanguage { @Context HttpHeaders httpHeaders; /** * @return Returns the string in the preferred language. */ @GET @Produces(MediaType.TEXT_PLAIN) public String getGreeting() { List<Locale> locales = httpHeaders.getAcceptableLanguages(); if (locales.size() == 0) { return "Hello!"; } Locale locale = locales.get(0); if (locale.equals(Locale.FRENCH)) { return "Bonjour!"; } else if (locale.equals(Locale.GERMAN)) { return "Guten Tag!"; } else { return "Hello!"; } } }
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