Spring Bean post processor

fishercoder1534 · fishercoder1534 · commit f9b5ffb43589 · 2016-08-06T10:24:33.000-07:00
diff --git a/SpringTutorials/src/common/Gospel1.java b/SpringTutorials/src/common/Gospel1.java
@@ -0,0 +1,23 @@
+package common;
+
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+@NoArgsConstructor
+public class Gospel1 {
+//	public Gospel1() {
+//	}
+
+//	public String getReflection() {
+//		return Reflection;
+//	}
+//
+//	public void setReflection(String reflection) {
+//		Reflection = reflection;
+//	}
+
+	@Setter @Getter
+	private String Reflection;
+
+}
diff --git a/SpringTutorials/src/common/HelloChina.java b/SpringTutorials/src/common/HelloChina.java
@@ -0,0 +1,35 @@
+package common;
+
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+@NoArgsConstructor
+public class HelloChina {
+
+//    public HelloChina() {
+//    }
+    
+    @Setter @Getter//these Lombok annotations eventually work in my own Eclipse and project now, I can safely comment out/remove those boilerplate code! Cool!
+    private String message;
+
+//    public void getMessage() {
+//    	System.out.println(message);
+//    }
+
+//    public void setMessage(String message) {
+//        this.message = message;
+//    }
+
+    // this init() method is required b/c I'm using HelloWorld as this
+    // HelloChina's parent bean
+    public void init() {
+        System.out.println("Bean HelloChina is going through init.");
+    }
+
+    // this destroy() method is required b/c I'm using HelloWorld as this
+    // HelloChina's parent bean
+    public void destroy() {
+        System.out.println("Bean HelloChina will destroy now.");
+    }
+}
diff --git a/SpringTutorials/src/common/HelloWorld.java b/SpringTutorials/src/common/HelloWorld.java
@@ -0,0 +1,24 @@
+package common;
+
+import lombok.Setter;
+
+public class HelloWorld {
+	@Setter 
+    private String message;
+
+//    public void setMessage(String message) {
+//        this.message = message;
+//    }
+
+    public void getMessage() {
+        System.out.println("Your Message : " + message);
+    }
+
+    public void init() {
+        System.out.println("Bean HelloWorld is going through init.");
+    }
+
+    public void destroy() {
+        System.out.println("Bean HelloWorld will destroy now.");
+    }
+}
diff --git a/SpringTutorials/src/spring_bean_post_processor/MainAppDemoBeanPostProcessor.java b/SpringTutorials/src/spring_bean_post_processor/MainAppDemoBeanPostProcessor.java
@@ -0,0 +1,24 @@
+package spring_bean_post_processor;
+
+/**This MainApp is working fine.*/
+import org.springframework.context.support.AbstractApplicationContext;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+public class MainAppDemoBeanPostProcessor {
+    public static void main(String[] args) {
+
+        AbstractApplicationContext context = new ClassPathXmlApplicationContext(
+                "spring_bean_post_processor/beansForDemoBeanPostProcessor.xml");
+
+        common.HelloWorld obj = (common.HelloWorld) context.getBean("helloWorld");
+        obj.getMessage();
+        
+        common.HelloChina obj2 = (common.HelloChina) context.getBean("helloChina");
+        obj2.setMessage("China is saying hello to the rest of the world!");
+        obj2.getMessage();
+        
+        context.registerShutdownHook();
+
+        System.out.println("The program ended! Cool!");
+    }
+}
diff --git a/SpringTutorials/src/spring_bean_post_processor/beansForDemoBeanPostProcessor.xml b/SpringTutorials/src/spring_bean_post_processor/beansForDemoBeanPostProcessor.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<beans xmlns="http://www.springframework.org/schema/beans"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://www.springframework.org/schema/beans
+    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
+
+	<!-- I have another class called "initHelloWorld.java" which has init and 
+		destroy methods, so that I could have these properties set for this helloWolrd 
+		bean, but since the child bean "helloChina" doesn't have this class and init/destroy 
+		methods, Spring won't work if I want to init helloChina bean. -->
+	<bean id="helloWorld" class="common.HelloWorld"
+		 init-method="init" destroy-method="destroy" lazy-init="true">
+		<property name="message"
+			value="Hello World from Steve Sun's very first own Spring project!" />
+	</bean>
+
+	<bean id="helloChina" class="common.HelloChina"
+		parent="helloWorld" lazy-init="true">
+		<property name="message" value="Hello China! It is China this time!" />
+	</bean>
+</beans>
diff --git a/SpringTutorials/src/spring_bean_post_processor/initHelloWorld.java b/SpringTutorials/src/spring_bean_post_processor/initHelloWorld.java
@@ -0,0 +1,26 @@
+package spring_bean_post_processor;
+
+import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.config.BeanPostProcessor;
+
+public class initHelloWorld implements BeanPostProcessor {
+
+    public initHelloWorld() {
+        // TODO Auto-generated constructor stub
+    }
+
+    @Override
+    public Object postProcessAfterInitialization(Object bean, String beanName)
+            throws BeansException {
+        System.out.println("Before Initialization : " + beanName);
+        return bean; // you can return any other object as well
+    }
+
+    @Override
+    public Object postProcessBeforeInitialization(Object bean, String beanName)
+            throws BeansException {
+        System.out.println("After Initialization : " + beanName);
+        return bean; // you can return any other object as well
+    }
+
+}
