java - 如何在 Servlet 中调用 java Rest WebService

Question

我有一个 java Rest WebService URL http://localhost:8080/WebServiceEx/rest/hello/dgdg

当我执行 URL 时，WebService 方法返回一个字符串

我的要求是在 Servlet 中调用上述 WebService URL，有人可以帮忙吗？

Servlet代码:

public Class StoreServlet extends HttpServlet{
 protected void doPost(HttpServletRequest req, HttpServletResponse resp)
      throws IOException, ServletException {

//Invoke WebService and Get Response String Here


} 

网络服务代码:

public class HelloWorldService {
    @Context 
    private ServletContext context;

    @GET
    @Path("/{param}")
    public Response getMsg(@PathParam("param") String msg) {

                    return Response.status(200).entity(msg).build();    

                }
    }

Answer 1

看看 Apache CXF JAX-RS 客户端:

http://cxf.apache.org/docs/jax-rs-client-api.html

例如

BookStore store = JAXRSClientFactory.create("http://bookstore.com", BookStore.class);
// (1) remote GET call to http://bookstore.com/bookstore
Books books = store.getAllBooks();
// (2) no remote call
BookResource subresource = store.getBookSubresource(1);
// {3} remote GET call to http://bookstore.com/bookstore/1
Book b = subresource.getBook();

或者，如果您使用 JAX-RS 2.0，它有一个 client API

例如

Client client = ClientFactory.newClient();

String bal = client.target("http://.../atm/balance")
                   .queryParam("card", "111122223333")
                   .queryParam("pin", "9876")
                   .request("text/plain").get(String.class); 

或者您可以使用纯 Java 以“核心”方式完成它:http://www.mkyong.com/webservices/jax-rs/restfull-java-client-with-java-net-url/