package org.javaee7.jaxrs.invocation.async;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.Entity;
import javax.ws.rs.client.Invocation;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.MultivaluedHashMap;
import javax.ws.rs.core.Response;
/**
* @author Arun Gupta
*/
@WebServlet(urlPatterns = {"/TestServlet"})
public class TestServlet extends HttpServlet {
/**
* Processes requests for both HTTP
* <code>GET</code> and
* <code>POST</code> methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>JAX-RS 2 Client Invocation Async API</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>JAX-RS 2 Client Invocation Async API at " + request.getContextPath() + "</h1>");
out.println("Initializing client...<br>");
Client client = ClientBuilder.newClient();
WebTarget target = client.target("http://"
+ request.getServerName()
+ ":"
+ request.getServerPort()
+ request.getContextPath()
+ "/webresources/resource");
// GET
out.print("Building a GET request ...<br>");
Invocation i1 = target.request().buildGet();
out.print("GET request ready ...<br>");
// POST
out.print("Building a POST request...<br>");
MultivaluedHashMap<String, String> map = new MultivaluedHashMap<>();
map.add("name", "Name");
map.add("age", "17");
Invocation i2 = target.request().buildPost(Entity.form(map));
out.print("POSTed request ready...<br>");
Future<Response> f1 = i1.submit();
Future<String> f2 = i2.submit(String.class);
try {
Response r1 = f1.get();
out.println("Response from r1: " + r1.readEntity(String.class) + "<br>");
String r2 = f2.get();
out.println("Response from r2: " + r2 + "<br>");
} catch (InterruptedException | ExecutionException ex) {
Logger.getLogger(TestServlet.class.getName()).log(Level.SEVERE, null, ex);
}
out.println("... done.<br>");
out.println("</body>");
out.println("</html>");
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP
* <code>GET</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP
* <code>POST</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}