Context and Servlet Initialization Parameters (#4656)

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javax-servlets/src/main/java/com/baeldung/servlets/UserServlet.java

@@ -0,0 +1,49 @@
+package com.baeldung.servlets;
+
+import java.io.IOException;
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebInitParam;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+@WebServlet(name = "UserServlet", urlPatterns = {"/userServlet"}, initParams={
+    @WebInitParam(name="name", value="Not provided"), 
+    @WebInitParam(name="email", value="Not provided")})
+public class UserServlet extends HttpServlet {
+    
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response)
+            throws ServletException, IOException {
+    }
+    
+    @Override
+    protected void doPost(HttpServletRequest request, HttpServletResponse response)
+            throws ServletException, IOException {
+        processRequest(request, response);
+        forwardRequest(request, response, "/WEB-INF/jsp/result.jsp");
+    }
+    
+    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
+            throws ServletException, IOException {
+        request.setAttribute("name", getRequestParameter(request, "name"));
+        request.setAttribute("email", getRequestParameter(request, "email"));
+        request.setAttribute("province", getContextParameter("province"));
+        request.setAttribute("country", getContextParameter("country"));
+    }
+    
+    protected String getRequestParameter(HttpServletRequest request, String name) {
+        String param = request.getParameter(name);
+        return !param.isEmpty() ? param : getInitParameter(name);
+    }
+    
+    protected String getContextParameter(String name) {
+        return getServletContext().getInitParameter(name);
+    }
+    
+    protected void forwardRequest(HttpServletRequest request, HttpServletResponse response, String path) 
+            throws ServletException, IOException {
+        request.getRequestDispatcher(path).forward(request, response);
+    }
+}