Merge pull request #10 from BlazingTwist/undertow-example

Undertow Example for ResourceHosting and an HTTP-GET Microservice
BlazingTwist · Nov 22, 2023 · d886b27 · d886b27
2 parents 2592191 + 1c30521
commit d886b27
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diff --git a/pom.xml b/pom.xml
@@ -65,6 +65,14 @@
             <version>1.4.11</version>
         </dependency>
 
+        <!-- https://mvnrepository.com/artifact/io.undertow/undertow-servlet -->
+        <dependency>
+            <groupId>io.undertow</groupId>
+            <artifactId>undertow-servlet</artifactId>
+            <version>2.3.10.Final</version>
+        </dependency>
+
+
     </dependencies>
 
 </project>
diff --git a/src/main/java/example/undertow/UndertowMicroserviceGET.java b/src/main/java/example/undertow/UndertowMicroserviceGET.java
@@ -0,0 +1,61 @@
+package example.undertow;
+
+import io.undertow.Handlers;
+import io.undertow.Undertow;
+import io.undertow.server.HttpHandler;
+import io.undertow.server.handlers.PathHandler;
+import io.undertow.servlet.Servlets;
+import io.undertow.servlet.api.DeploymentInfo;
+import io.undertow.servlet.api.DeploymentManager;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServlet;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+
+/**
+ * Hostet einen einfachen Microservice unter <a href="http://localhost:8080/micro">localhost/micro</a>
+ */
+public class UndertowMicroserviceGET {
+    private static final Logger logger = LoggerFactory.getLogger(UndertowResourceHosting.class);
+
+    @SuppressWarnings("DuplicatedCode") // example code. Duplication is allowed
+    public static void main(String[] args) throws ServletException {
+        DeploymentInfo deployment = Servlets.deployment()
+                .setClassLoader(UndertowResourceHosting.class.getClassLoader())
+                .setContextPath("")
+                .setDeploymentName("Example_UndertowMicroserviceGET")
+                .addServlet(Servlets.servlet("ExampleMicroservice", MicroserviceImpl.class).addMapping("/micro"));
+
+        DeploymentManager manager = Servlets.defaultContainer().addDeployment(deployment);
+        manager.deploy();
+        HttpHandler handler = manager.start();
+        PathHandler pathHandler = Handlers.path(handler);
+
+        Undertow server = Undertow.builder()
+                .addHttpListener(8080, "localhost")
+                .setHandler(pathHandler)
+                .build();
+        server.start();
+        logger.info("Server started");
+    }
+
+    public static final class MicroserviceImpl extends HttpServlet {
+        private int numberOfRequests = 0;
+
+        @Override
+        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
+            numberOfRequests++;
+            String message = "Your visitor-number is #" + numberOfRequests;
+
+            resp.setContentType("text/html");
+            PrintWriter responseWriter = resp.getWriter();
+            responseWriter.println("<html><body><h2>" + message + "</h2></body/></html>");
+            responseWriter.close();
+        }
+    }
+}
diff --git a/src/main/java/example/undertow/UndertowResourceHosting.java b/src/main/java/example/undertow/UndertowResourceHosting.java
@@ -0,0 +1,43 @@
+package example.undertow;
+
+import io.undertow.Handlers;
+import io.undertow.Undertow;
+import io.undertow.server.HttpHandler;
+import io.undertow.server.handlers.PathHandler;
+import io.undertow.server.handlers.resource.ClassPathResourceManager;
+import io.undertow.servlet.Servlets;
+import io.undertow.servlet.api.DeploymentInfo;
+import io.undertow.servlet.api.DeploymentManager;
+import jakarta.servlet.ServletException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Einfaches Undertow Beispiel mit Resource hosting.<p>
+ * Ressourcen können dann im Browser geöffnet werden,
+ * z.B. '<a href="http://localhost:8080/jchess/images.org/Bishop-W.png">Bishop-W.png</a>'
+ */
+public class UndertowResourceHosting {
+    private static final Logger logger = LoggerFactory.getLogger(UndertowResourceHosting.class);
+
+    @SuppressWarnings("DuplicatedCode") // example code. Duplication is allowed
+    public static void main(String[] args) throws ServletException {
+        DeploymentInfo deployment = Servlets.deployment()
+                .setClassLoader(UndertowResourceHosting.class.getClassLoader())
+                .setContextPath("")
+                .setDeploymentName("Example_UndertowResourceHosting")
+                .setResourceManager(new ClassPathResourceManager(UndertowResourceHosting.class.getClassLoader()));
+
+        DeploymentManager manager = Servlets.defaultContainer().addDeployment(deployment);
+        manager.deploy();
+        HttpHandler handler = manager.start();
+        PathHandler pathHandler = Handlers.path(handler);
+
+        Undertow server = Undertow.builder()
+                .addHttpListener(8080, "localhost")
+                .setHandler(pathHandler)
+                .build();
+        server.start();
+        logger.info("Server started");
+    }
+}