Using qualifier

pom.xml

@@ -14,7 +14,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.0.0.M1</version>
+		<version>2.1.0.RELEASE</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
 

src/main/java/guru/springframework/DiDemoApplication.java

@@ -1,12 +1,25 @@
 package guru.springframework;
 
+import guru.springframework.controllers.ConstructorInjectedController;
+import guru.springframework.controllers.GetterInjectedController;
+import guru.springframework.controllers.MyController;
+import guru.springframework.controllers.PropertyInjectedController;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.ApplicationContext;
 
 @SpringBootApplication
 public class DiDemoApplication {
 
 	public static void main(String[] args) {
-		SpringApplication.run(DiDemoApplication.class, args);
+		ApplicationContext ctx = SpringApplication.run(DiDemoApplication.class, args);
+
+		MyController controller = (MyController) ctx.getBean("myController");
+
+		controller.hello();
+
+		System.out.println(ctx.getBean(PropertyInjectedController.class).sayHello());
+		System.out.println(ctx.getBean(GetterInjectedController.class).sayHello());
+		System.out.println(ctx.getBean(ConstructorInjectedController.class).sayHello());
 	}
 }

src/main/java/guru/springframework/controllers/ConstructorInjectedController.java

@@ -0,0 +1,22 @@
+package guru.springframework.controllers;
+
+import guru.springframework.services.GreetingService;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.stereotype.Controller;
+
+/**
+ * Created by jt on 5/24/17.
+ */
+@Controller
+public class ConstructorInjectedController {
+
+    private GreetingService greetingService;
+
+    public ConstructorInjectedController(@Qualifier("constructorGreetingService") GreetingService greetingService) {
+        this.greetingService = greetingService;
+    }
+
+    public String sayHello(){
+        return greetingService.sayGreeting();
+    }
+}

src/main/java/guru/springframework/controllers/GetterInjectedController.java

@@ -0,0 +1,23 @@
+package guru.springframework.controllers;
+
+import guru.springframework.services.GreetingService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.stereotype.Controller;
+
+/**
+ * Created by jt on 5/24/17.
+ */
+@Controller
+public class GetterInjectedController {
+    private GreetingService greetingService;
+
+    public String sayHello(){
+        return greetingService.sayGreeting();
+    }
+
+    @Autowired
+    public void setGreetingService(@Qualifier("getterGreetingService") GreetingService greetingService) {
+        this.greetingService = greetingService;
+    }
+}

src/main/java/guru/springframework/controllers/MyController.java

@@ -0,0 +1,16 @@
+package guru.springframework.controllers;
+
+import org.springframework.stereotype.Controller;
+
+/**
+ * Created by jt on 5/23/17.
+ */
+@Controller
+public class MyController {
+
+    public String hello(){
+        System.out.println("Hello!!! ");
+
+        return "foo";
+    }
+}

src/main/java/guru/springframework/controllers/PropertyInjectedController.java

@@ -0,0 +1,21 @@
+package guru.springframework.controllers;
+
+import guru.springframework.services.GreetingService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+
+
+/**
+ * Created by jt on 5/24/17.
+ */
+@Controller
+public class PropertyInjectedController {
+
+    @Autowired
+    public GreetingService greetingServiceImpl;
+
+    public String sayHello(){
+        return greetingServiceImpl.sayGreeting();
+    }
+
+}

src/main/java/guru/springframework/services/ConstructorGreetingService.java

@@ -0,0 +1,14 @@
+package guru.springframework.services;
+
+import org.springframework.stereotype.Service;
+
+/**
+ * Created by jt on 5/24/17.
+ */
+@Service
+public class ConstructorGreetingService implements GreetingService {
+    @Override
+    public String sayGreeting() {
+        return "Hello - I was injected via the constructor!!!";
+    }
+}

src/main/java/guru/springframework/services/GetterGreetingService.java

@@ -0,0 +1,15 @@
+package guru.springframework.services;
+
+import org.springframework.stereotype.Service;
+
+/**
+ * Created by jt on 5/24/17.
+ */
+@Service
+public class GetterGreetingService implements GreetingService {
+
+    @Override
+    public String sayGreeting() {
+        return "Hello - I was injected by the getter";
+    }
+}

src/main/java/guru/springframework/services/GreetingService.java

@@ -0,0 +1,9 @@
+package guru.springframework.services;
+
+/**
+ * Created by jt on 5/24/17.
+ */
+public interface GreetingService {
+
+    String sayGreeting();
+}

src/main/java/guru/springframework/services/GreetingServiceImpl.java

@@ -0,0 +1,17 @@
+package guru.springframework.services;
+
+import org.springframework.stereotype.Service;
+
+/**
+ * Created by jt on 5/24/17.
+ */
+@Service
+public class GreetingServiceImpl implements GreetingService {
+
+    public static final String HELLO_GURUS = "Hello Gurus!!!!";
+
+    @Override
+    public String sayGreeting() {
+        return HELLO_GURUS;
+    }
+}

src/test/java/guru/springframework/controllers/ConstructorInjectedControllerTest.java

@@ -0,0 +1,24 @@
+package guru.springframework.controllers;
+
+import guru.springframework.services.GreetingServiceImpl;
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Created by jt on 5/24/17.
+ */
+public class ConstructorInjectedControllerTest {
+    private ConstructorInjectedController constructorInjectedController;
+
+    @Before
+    public void setUp() throws Exception {
+        this.constructorInjectedController = new ConstructorInjectedController(new GreetingServiceImpl());
+    }
+
+    @Test
+    public void testGreeting() throws Exception {
+        assertEquals(GreetingServiceImpl.HELLO_GURUS, constructorInjectedController.sayHello());
+    }
+}

src/test/java/guru/springframework/controllers/GetterInjectedControllerTest.java

@@ -0,0 +1,26 @@
+package guru.springframework.controllers;
+
+import guru.springframework.services.GreetingServiceImpl;
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Created by jt on 5/24/17.
+ */
+public class GetterInjectedControllerTest {
+
+    private GetterInjectedController getterInjectedController;
+
+    @Before
+    public void setUp() throws Exception {
+        this.getterInjectedController = new GetterInjectedController();
+        this.getterInjectedController.setGreetingService(new GreetingServiceImpl());
+    }
+
+    @Test
+    public void testGreeting() throws Exception {
+        assertEquals(GreetingServiceImpl.HELLO_GURUS, getterInjectedController.sayHello());
+    }
+}

src/test/java/guru/springframework/controllers/PropertyInjectedControllerTest.java

@@ -0,0 +1,26 @@
+package guru.springframework.controllers;
+
+import guru.springframework.services.GreetingServiceImpl;
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Created by jt on 5/24/17.
+ */
+public class PropertyInjectedControllerTest {
+
+    private PropertyInjectedController propertyInjectedController;
+
+    @Before
+    public void setUp() throws Exception {
+        this.propertyInjectedController = new PropertyInjectedController();
+        this.propertyInjectedController.greetingServiceImpl = new GreetingServiceImpl();
+    }
+
+    @Test
+    public void testGreeting() throws Exception {
+        assertEquals(GreetingServiceImpl.HELLO_GURUS, propertyInjectedController.sayHello());
+    }
+}