new pattern: Issue#1264: Implemented Composite-View Pattern (#1923)

* initial commit, created package, README, pom, and directory structure. * Issue#1264, continue working on JavaBeans, added getters, setters, and private fields. Created test file for JavaBeans. * set up junit for tests folder. * Issue#1264, set up local server and added web-application framework to composite-view to allow the JSP to run on a local Tomcat container. Wrote unit tests for Java-bean class, working on JSP pages. * Issue#1264, Added forwarding functionality to servlet and main composite view page. * Issue#1264, Finished composite view template in newsDisplay.jsp and created atomic sub-view components in businessNews.jsp, header.jsp, localNews.jsp, scienceNews.jsp, sportsNews.jsp, worldNews.jsp. Composite view page renders correctly, atomic views are inserted in and substituted in the template page depending on request parameters. * Issue#1264, Added all views, updated README.md with documentation. * Issue#1264, updated README.md, moved images folder into etc folder. * Issue#1264, removed build artifacts from tracked files. * Issue#1264, updated README.md * Issue#1264, updated README.md * Issue#1264, removed unused import, made AppServlet class final, changed to .equals() for string comparison. * Issue#1264, in AppServlet, put the output writing into try blocks to ensure writers are closed. * Issue#1264, added tests for Servlet, coverage up to 100%, used lombok to reduce boilerplate setters and getter, updated README.md with better grammar, appropriate tags and links to related patterns. Updated pom.xml to get rid of superfluous lines. * Issue#1264, made changes as requested in README.md. Co-authored-by: Ilkka Seppälä <iluwatar@users.noreply.github.com>
2026-05-14 10:58:42 +00:00 · 2022-01-18 13:51:53 -06:00
parent 07ee94d671
commit 7652b11bca
20 changed files with 978 additions and 0 deletions
@@ -0,0 +1,64 @@
+package com.iluwatar.compositeview;
+
+import jakarta.servlet.RequestDispatcher;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServlet;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.io.PrintWriter;
+
+/**
+ * A servlet object that extends HttpServlet.
+ * Runs on Tomcat 10 and handles Http requests
+ */
+
+public final class AppServlet extends HttpServlet {
+  private String msgPartOne = "<h1>This Server Doesn't Support";
+  private String msgPartTwo = "Requests</h1>\n"
+      + "<h2>Use a GET request with boolean values for the following parameters<h2>\n"
+      + "<h3>'name'</h3>\n<h3>'bus'</h3>\n<h3>'sports'</h3>\n<h3>'sci'</h3>\n<h3>'world'</h3>";
+
+  private String destination = "newsDisplay.jsp";
+
+  public AppServlet() {
+
+  }
+
+  @Override
+  public void doGet(HttpServletRequest req, HttpServletResponse resp)
+          throws ServletException, IOException {
+    RequestDispatcher requestDispatcher = req.getRequestDispatcher(destination);
+    ClientPropertiesBean reqParams = new ClientPropertiesBean(req);
+    req.setAttribute("properties", reqParams);
+    requestDispatcher.forward(req, resp);
+  }
+
+  @Override
+  public void doPost(HttpServletRequest req, HttpServletResponse resp)
+          throws ServletException, IOException {
+    resp.setContentType("text/html");
+    try (PrintWriter out = resp.getWriter()) {
+      out.println(msgPartOne + " Post " + msgPartTwo);
+    }
+
+  }
+
+  @Override
+  public void doDelete(HttpServletRequest req, HttpServletResponse resp)
+          throws ServletException, IOException {
+    resp.setContentType("text/html");
+    try (PrintWriter out = resp.getWriter()) {
+      out.println(msgPartOne + " Delete " + msgPartTwo);
+    }
+  }
+
+  @Override
+  public void doPut(HttpServletRequest req, HttpServletResponse resp)
+          throws ServletException, IOException {
+    resp.setContentType("text/html");
+    try (PrintWriter out = resp.getWriter()) {
+      out.println(msgPartOne + " Put " + msgPartTwo);
+    }
+  }
+}