BAEL-2982 NanoHTTPD guide (#7148)

libraries-server/src/main/java/com/baeldung/nanohttpd/ApplicationController.java

@@ -0,0 +1,38 @@
+package com.baeldung.nanohttpd;
+
+import fi.iki.elonen.NanoHTTPD;
+import fi.iki.elonen.router.RouterNanoHTTPD;
+
+import java.io.IOException;
+
+public class ApplicationController extends RouterNanoHTTPD {
+
+    ApplicationController() throws IOException {
+        super(8072);
+        addMappings();
+        start(NanoHTTPD.SOCKET_READ_TIMEOUT, false);
+    }
+
+    @Override
+    public void addMappings() {
+        addRoute("/", IndexHandler.class);
+        addRoute("/users", UserHandler.class);
+    }
+
+    public static class UserHandler extends DefaultHandler {
+        @Override
+        public String getText() {
+            return "UserA, UserB, UserC";
+        }
+
+        @Override
+        public String getMimeType() {
+            return MIME_PLAINTEXT;
+        }
+
+        @Override
+        public Response.IStatus getStatus() {
+            return Response.Status.OK;
+        }
+    }
+}