无法捕获RESTful Web服务上的请求(Unable to capture request on a RESTful Web service)

 我是Web服务的新手，并且已经对它进行了大量的研究，但我目前无法捕获我需要用于身份验证的请求标头。 
 
 这是一个场景：我在我的JAX-RS RESTful Web服务上调用了一个login（）方法，在向请求标头添加用户名/密码组合之后，我有一个Android客户端。 然后，Web服务（在JBoss AS 7.1上运行）应该捕获这些头。 
 
 问题是每次调用此login（）方法时，请求似乎尚未得到服务，因此在执行WebServiceContext.getMessageContext（）时会导致IllegalStateException。 
 
 我已经尝试将@PostConstruct注释添加到方法的标题中，但无济于事。 当我这样做时，该方法似乎根本没有初始化。 相反，我在调用它时有一个ClassNotFoundException。 
 
 我怎样才能解决这个问题？ 我已经坚持了几天，并在客户端和Web服务上尝试了多种不同的方法来捕获这些标题，但它们要么不适用于项目的体系结构，要么根本无法按预期工作。 
 
 这是服务的界面： 
 
@ApplicationPath("/apppath")
@Path("/wspath")
public interface LoginService {

    @GET
    @Path("/login")
    @Produces(MediaType.APPLICATION_JSON)
    public String login();
}
 
 这是服务的实现： 
 
@Stateless
@Local(LoginService.class)
public class LoginServiceImpl implements LoginService {

    @Resource
    WebServiceContext wsContext;

    @Override
    public String login() {

        // This line throws an IllegalStateException.
        MessageContext msgContext = wsContext.getMessageContext();

        // TODO: Capture authentication data from headers.   
        @SuppressWarnings("unchecked")
        Map<String, List<String>> headers = (Map<String, List<String>>) msgContext.get(MessageContext.HTTP_REQUEST_HEADERS);

        // Dummy return for testing purposes.
        return "It works" + headers.toString();
    }
}
 
 这是一个简单的JUnit测试代码，我正在努力尝试在客户端修复问题。 
 
public class LoginServiceTest {

    @Test
    public void test() {

        String mEmail = "a@a.com";
        String mPassword = "aaaa";

        HttpGet request = new HttpGet("http://localhost:8080/apppath/wspath/login"); 

        String auth = Base64.encodeBytes((mEmail + ":" + mPassword).getBytes());
        request.addHeader("Authorization", "Basic " + auth);

        HttpClient httpClient = new DefaultHttpClient();

        try {
            InputStream inputStream = httpClient.execute(request).getEntity().getContent();

            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));             
            String wsReturn;

            while ((wsReturn = bufferedReader.readLine()) != null) {
                System.out.println(wsReturn);
            }
        } catch (IllegalStateException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

I'm new to web services in general and have been doing a lot of research on it, but I'm currently unable to capture request headers I need for authentication purposes.
 
Here's the scenario: I have an Android client calling a login() method on my JAX-RS RESTful web service, after adding a username/password combination to the request headers. The web service (which runs on JBoss AS 7.1) should then capture those headers.
 
The problem is everytime this login() method is called, the request seems to have not being serviced yet, thus leading to an IllegalStateException upon executing WebServiceContext.getMessageContext().
 
I've tried adding @PostConstruct annotation to the method's header, but to no avail. When I do this the method doesn't seem to be initialized at all. Instead I have a ClassNotFoundException upon calling it.
 
How can I get through this issue? I've been stuck on this for days and tried multiple different approaches both at the client and the web service to capture those headers, but they would either not apply to the project's architecture or simply not work as expected.
 
Here's the service's interface:
 
@ApplicationPath("/apppath")
@Path("/wspath")
public interface LoginService {

    @GET
    @Path("/login")
    @Produces(MediaType.APPLICATION_JSON)
    public String login();
}
 
Here's the service's implementation:
 
@Stateless
@Local(LoginService.class)
public class LoginServiceImpl implements LoginService {

    @Resource
    WebServiceContext wsContext;

    @Override
    public String login() {

        // This line throws an IllegalStateException.
        MessageContext msgContext = wsContext.getMessageContext();

        // TODO: Capture authentication data from headers.   
        @SuppressWarnings("unchecked")
        Map<String, List<String>> headers = (Map<String, List<String>>) msgContext.get(MessageContext.HTTP_REQUEST_HEADERS);

        // Dummy return for testing purposes.
        return "It works" + headers.toString();
    }
}
 
And here's a simple JUnit test code I'm working on to try to fix the problem on client side.
 
public class LoginServiceTest {

    @Test
    public void test() {

        String mEmail = "a@a.com";
        String mPassword = "aaaa";

        HttpGet request = new HttpGet("http://localhost:8080/apppath/wspath/login"); 

        String auth = Base64.encodeBytes((mEmail + ":" + mPassword).getBytes());
        request.addHeader("Authorization", "Basic " + auth);

        HttpClient httpClient = new DefaultHttpClient();

        try {
            InputStream inputStream = httpClient.execute(request).getEntity().getContent();

            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));             
            String wsReturn;

            while ((wsReturn = bufferedReader.readLine()) != null) {
                System.out.println(wsReturn);
            }
        } catch (IllegalStateException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

原文：https://stackoverflow.com/questions/14433525