simple web app

.idea/workspace.xml

@@ -5,32 +5,58 @@
   </component>
   <component name="ChangeListManager">
     <list default="true" id="ad904d3c-917a-41ec-8997-0c459fd2925c" name="Changes" comment="">
+      <change afterPath="$PROJECT_DIR$/src/main/java/org/ds/WebServer.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/pom.xml" beforeDir="false" afterPath="$PROJECT_DIR$/pom.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/main/java/org/ds/Main.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/org/ds/Main.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/main/resources/index.html" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/resources/index.html" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
     <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
     <option name="LAST_RESOLUTION" value="IGNORE" />
   </component>
+  <component name="FileTemplateManagerImpl">
+    <option name="RECENT_TEMPLATES">
+      <list>
+        <option value="Class" />
+      </list>
+    </option>
+  </component>
   <component name="Git.Settings">
     <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
   </component>
-  <component name="ProjectColorInfo"><![CDATA[{
-  "associatedIndex": 1
-}]]></component>
+  <component name="ProjectColorInfo">{
+  &quot;associatedIndex&quot;: 1
+}</component>
   <component name="ProjectId" id="2tREiXPX513LksO5LzaY0KttqM7" />
   <component name="ProjectLevelVcsManager" settingsEditedManually="true" />
   <component name="ProjectViewState">
     <option name="hideEmptyMiddlePackages" value="true" />
     <option name="showLibraryContents" value="true" />
   </component>
-  <component name="PropertiesComponent"><![CDATA[{
-  "keyToString": {
-    "RunOnceActivity.ShowReadmeOnStart": "true",
-    "git-widget-placeholder": "master",
-    "kotlin-language-version-configured": "true"
+  <component name="PropertiesComponent">{
+  &quot;keyToString&quot;: {
+    &quot;RunOnceActivity.ShowReadmeOnStart&quot;: &quot;true&quot;,
+    &quot;git-widget-placeholder&quot;: &quot;master&quot;,
+    &quot;kotlin-language-version-configured&quot;: &quot;true&quot;
   }
-}]]></component>
+}</component>
+  <component name="RunManager">
+    <configuration default="true" type="JetRunConfigurationType">
+      <module name="simple-web-app" />
+      <method v="2">
+        <option name="Make" enabled="true" />
+      </method>
+    </configuration>
+    <configuration default="true" type="KotlinStandaloneScriptRunConfigurationType">
+      <module name="simple-web-app" />
+      <option name="filePath" />
+      <method v="2">
+        <option name="Make" enabled="true" />
+      </method>
+    </configuration>
+  </component>
   <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="application-level" UseSingleDictionary="true" transferred="true" />
   <component name="TaskManager">
     <task active="true" id="Default" summary="Default task">
@@ -42,4 +68,15 @@
     </task>
     <servers />
   </component>
+  <component name="Vcs.Log.Tabs.Properties">
+    <option name="TAB_STATES">
+      <map>
+        <entry key="MAIN">
+          <value>
+            <State />
+          </value>
+        </entry>
+      </map>
+    </option>
+  </component>
 </project>
\ No newline at end of file

pom.xml

@@ -14,4 +14,13 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 
+    <dependencies>
+        <!-- https://mvnrepository.com/artifact/org.jsoup/jsoup -->
+        <dependency>
+            <groupId>org.jsoup</groupId>
+            <artifactId>jsoup</artifactId>
+            <version>1.12.1</version>
+        </dependency>
+
+    </dependencies>
 </project>
\ No newline at end of file

src/main/java/org/ds/Main.java

@@ -2,6 +2,14 @@ package org.ds;
 
 public class Main {
     public static void main(String[] args) {
-        System.out.println("Hello world!");
+        if (args.length != 2) {
+            System.out.println("java -jar (jar name) PORT_NUMBER SERVER_NAME");
+        }
+        int currentServerPort = Integer.parseInt(args[0]);
+        String serverName = args[1];
+
+        WebServer webServer = new WebServer(currentServerPort, serverName);
+
+        webServer.startServer();
     }
 }
\ No newline at end of file

src/main/java/org/ds/WebServer.java

+package org.ds;
+
+import com.sun.net.httpserver.HttpExchange;
+import com.sun.net.httpserver.HttpServer;
+import org.jsoup.Jsoup;
+import org.jsoup.nodes.Document;
+import org.jsoup.nodes.Element;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.InetSocketAddress;
+import java.util.concurrent.Executors;
+
+public class WebServer {
+    private static final String STATUS_ENDPOINT = "/status";
+    private static final String HOME_PAGE_ENDPOINT = "/";
+
+    private static final String HTML_PAGE = "index.html";
+
+    private final int port;
+    private HttpServer server;
+    private final String serverName;
+
+    public WebServer(int port, String serverName) {
+        this.port = port;
+        this.serverName = serverName;
+    }
+
+    public void startServer() {
+        try {
+            this.server = HttpServer.create(new InetSocketAddress(port), 0);
+        } catch (IOException e) {
+            e.printStackTrace();
+            return;
+        }
+
+        server.createContext(STATUS_ENDPOINT, this::handleStatusCheckRequest);
+        server.createContext(HOME_PAGE_ENDPOINT, this::handleHomePageRequest);
+
+        server.setExecutor(Executors.newFixedThreadPool(8));
+        System.out.println(String.format("Started server %s on port %d ", serverName, port));
+        server.start();
+    }
+
+    private void handleHomePageRequest(HttpExchange exchange) throws IOException {
+        if (!exchange.getRequestMethod().equalsIgnoreCase("get")) {
+            exchange.close();
+            return;
+        }
+
+        System.out.println(String.format("%s received a request", this.serverName));
+        exchange.getResponseHeaders().add("Content-Type", "text/html");
+        exchange.getResponseHeaders().add("Cache-Control", "no-cache");
+
+        byte[] response = loadHtml(HTML_PAGE);
+
+        sendResponse(response, exchange);
+    }
+
+    /**
+     * Loads the HTML page to be fetched to the web browser
+     *
+     * @param htmlFilePath - The relative path to the html file
+     * @throws IOException
+     */
+    private byte[] loadHtml(String htmlFilePath) throws IOException {
+        InputStream htmlInputStream = getClass().getResourceAsStream(htmlFilePath);
+        if (htmlInputStream == null) {
+            return new byte[]{};
+        }
+
+        Document document = Jsoup.parse(htmlInputStream, "UTF-8", "");
+
+        String modifiedHtml = modifyHtmlDocument(document);
+        return modifiedHtml.getBytes();
+    }
+
+    /**
+     * Fills the server's name and local time in theHTML document
+     *
+     * @param document - original HTML document
+     */
+    private String modifyHtmlDocument(Document document) {
+        Element serverNameElement = document.selectFirst("#server_name");
+        serverNameElement.appendText(serverName);
+        return document.toString();
+    }
+
+    private void handleStatusCheckRequest(HttpExchange exchange) throws IOException {
+        if (!exchange.getRequestMethod().equalsIgnoreCase("get")) {
+            exchange.close();
+            return;
+        }
+
+        System.out.println("Received a health check");
+        String responseMessage = "Server is alive\n";
+        sendResponse(responseMessage.getBytes(), exchange);
+    }
+
+    private void sendResponse(byte[] responseBytes, HttpExchange exchange) throws IOException {
+        exchange.sendResponseHeaders(200, responseBytes.length);
+        OutputStream outputStream = exchange.getResponseBody();
+        outputStream.write(responseBytes);
+        outputStream.flush();
+        outputStream.close();
+    }
+}

src/main/resources/index.html

+
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Distributed Search</title>
+    <meta http-equiv="cache-control" content="no-cache"/>
+</head>
+<body style="background: #e6f3ff;">
+<h1 style="color:blue; text-align: center; font-style: bold" id="server_name_title">Welcome to </h1>
+<h1 style="color:#00b4ff; text-align: center; font-style: italic" id="server_name"></h1>
+</body>
+</html>
\ No newline at end of file