Added Spring Framework sample code

6 files changed, 122 insertions, 0 deletions

diff --git a/spring-framework/04-basic-no-xml-java-configuration/.gitignore b/spring-framework/04-basic-no-xml-java-configuration/.gitignore
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+# Eclipse
+bin
+.settings
+.metadata
+.classpath
+.project
+
+# Maven
+target
diff --git a/spring-framework/04-basic-no-xml-java-configuration/README b/spring-framework/04-basic-no-xml-java-configuration/README
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+This project illustrates how a Java class can be made to describe the Spring configuration
+where the objects returned by methods in the class are made to be the Spring beans.
+
+The class is annotated with @Configuration which indicates that the primary purpose of the
+class is to act as a source of bean definitions.
+
+@Bean is used with a method to indicate that the method instantiates, configures, and
+initializes a new object to be managed by the Spring IoC container. It plays the same role
+as the <bean/> element.
+
+It is not necessary for the classes from which beans are instantiated to have annotations
+like @Component or @Autowired since the @Bean annotated methods perform the configuration.
diff --git a/spring-framework/04-basic-no-xml-java-configuration/pom.xml b/spring-framework/04-basic-no-xml-java-configuration/pom.xml
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+++ b/spring-framework/04-basic-no-xml-java-configuration/pom.xml
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+<project xmlns="http://maven.apache.org/POM/4.0.0"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<parent>
+		<groupId>com.example.spring</groupId>
+		<artifactId>base-config</artifactId>
+		<version>0.0.1-SNAPSHOT</version>
+		<relativePath>../00-config</relativePath>
+	</parent>
+
+	<artifactId>basic-no-xml-java-configuration</artifactId>
+	<packaging>jar</packaging>
+
+</project>
diff --git a/spring-framework/04-basic-no-xml-java-configuration/src/main/java/com/example/spring/App.java b/spring-framework/04-basic-no-xml-java-configuration/src/main/java/com/example/spring/App.java
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+++ b/spring-framework/04-basic-no-xml-java-configuration/src/main/java/com/example/spring/App.java
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+package com.example.spring;
+
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class App {
+
+	public static void main(String[] args) {
+		@SuppressWarnings("resource")
+		ApplicationContext ctx = new AnnotationConfigApplicationContext(App.class);
+
+		MathsUser mathsUser = ctx.getBean(MathsUser.class);
+
+		mathsUser.doTask();
+	}
+
+	@Bean
+	public Maths maths() {
+		Maths maths = new Maths();
+		maths.setB(100);
+
+		return maths;
+	}
+
+	@Bean
+	public MathsUser mathsUser() {
+		MathsUser mathsUser = new MathsUser();
+
+		/*
+		 * What would the maths() return? Would it be the Spring managed bean or what
+		 * would be returned when the maths() method is directly invoked?
+		 * 
+		 * @Bean can be used with classes annotated with @Component tool.
+		 * 
+		 * In a class annotated with @Configuration, maths() return the Spring managed bean.
+		 *  
+		 * In a class annotated with @Component, what is returned by maths() is not the
+		 * Spring managed bean, but what would be returned when the maths() method is directly invoked.
+		 * 
+		 * For more details, look at the 'Full @Configuration vs “lite” @Bean mode?' description
+		 * found in the 'Core Technologies' section of the Spring Framework Reference documentation.  
+		 */
+		mathsUser.setMaths(maths());
+
+		return mathsUser;
+	}
+}
\ No newline at end of file
diff --git a/spring-framework/04-basic-no-xml-java-configuration/src/main/java/com/example/spring/Maths.java b/spring-framework/04-basic-no-xml-java-configuration/src/main/java/com/example/spring/Maths.java
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+++ b/spring-framework/04-basic-no-xml-java-configuration/src/main/java/com/example/spring/Maths.java
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+package com.example.spring;
+
+public class Maths {
+	
+	private int b;
+	
+	public int getB() {
+		return b;
+	}
+
+	public void setB(int b) {
+		this.b = b;
+	}
+
+
+	public int add(int a) {
+		return a + b;
+	}
+}
diff --git a/spring-framework/04-basic-no-xml-java-configuration/src/main/java/com/example/spring/MathsUser.java b/spring-framework/04-basic-no-xml-java-configuration/src/main/java/com/example/spring/MathsUser.java
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+++ b/spring-framework/04-basic-no-xml-java-configuration/src/main/java/com/example/spring/MathsUser.java
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+package com.example.spring;
+
+public class MathsUser {
+
+	private Maths maths;
+	
+	public void setMaths(Maths maths) {
+		this.maths = maths;
+	}
+	
+	public void doTask() {
+		int result = maths.add(10);
+		
+		System.out.println(result);
+	}
+}