Spring JavaConfig範例

Spring XML file - applicationContext.xml :

<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">
 
	<bean id="helloBean" class="com.yiibai.hello.impl.HelloWorldImpl">
		
</beans>

package com.yiibai.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.yiibai.hello.HelloWorld;
import com.yiibai.hello.impl.HelloWorldImpl;

@Configuration
public class AppConfig {
	
    @Bean(name="helloBean")
    public HelloWorld helloWorld() {
        return new HelloWorldImpl();
    }
	
}

Spring JavaConfig Hello World

1. 工程目錄結構

3. Spring Bean

一個簡單的Bean

package com.yiibai.hello;
 
public interface HelloWorld {
	
	void printHelloWorld(String msg);
 
}

package com.yiibai.hello.impl;

import com.yiibai.hello.HelloWorld;

public class HelloWorldImpl implements HelloWorld {

	@Override
	public void printHelloWorld(String msg) {

		System.out.println("Hello : " + msg);
	}

}

4. JavaConfig 註解

package com.yiibai.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.yiibai.hello.HelloWorld;
import com.yiibai.hello.impl.HelloWorldImpl;

@Configuration
public class AppConfig {
	
    @Bean(name="helloBean")
    public HelloWorld helloWorld() {
        return new HelloWorldImpl();
    }
	
}

5. 執行結果

使用 AnnotationConfigApplicationContext 載入您的JavaConfig類

package com.yiibai.core;
 
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import com.yiibai.config.AppConfig;
import com.yiibai.hello.HelloWorld;
 
public class App {
	public static void main(String[] args) {
	    
            ApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);
	    HelloWorld obj = (HelloWorld) context.getBean("helloBean");
	    
	    obj.printHelloWorld("Spring Java Config");

	}
}

輸出結果

Hello : Spring Java Config