Spring JavaConfig @Import範例

一般來說, 需要按模組或類別分割Spring XML bean檔案成多個小檔案, 使事情更容易維護和模組化。例如，

<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-2.5.xsd">
 
	<import resource="config/customer.xml"/>
        <import resource="config/scheduler.xml"/>
 
</beans>

Spring3 JavaConfig它等效於 @Import 功能

package com.yiibai.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;

@Configuration
@Import({ CustomerConfig.class, SchedulerConfig.class })
public class AppConfig {

}

@Import範例

請參閱使用JavaConfig @Import的一個完整的例子。

1. 目錄結構

本範例目錄結構。

2. Spring Beans

兩個簡單的Spring bean。

File : CustomerBo.java

package com.yiibai.core;

public class CustomerBo {

	public void printMsg(String msg) {

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

}

File : SchedulerBo.java

package com.yiibai.core;

public class SchedulerBo {

	public void printMsg(String msg) {

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

}

3. @Configuration範例

現在，使用JavaConfig @Configuration宣告上述Bean類。

File : CustomerConfig.java

package com.yiibai.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.yiibai.core.CustomerBo;

@Configuration
public class CustomerConfig {
	
	@Bean(name="customer")
	public CustomerBo customerBo(){
		
		return new CustomerBo();
		
	}
}

File : SchedulerConfig.java

package com.yiibai.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.yiibai.core.SchedulerBo;

@Configuration
public class SchedulerConfig {
	
	@Bean(name="scheduler")
	public SchedulerBo suchedulerBo(){
		
		return new SchedulerBo();
		
	}
	
}

4. @Import範例

使用@Import載入多個組態檔案。

File : AppConfig.java

package com.yiibai.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;

@Configuration
@Import({ CustomerConfig.class, SchedulerConfig.class })
public class AppConfig {

}

5. 執行程式

載入主組態檔案，並進行測試。

package com.yiibai.core;

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import com.yiibai.config.AppConfig;

public class App {
	public static void main(String[] args) {

		ApplicationContext context = new AnnotationConfigApplicationContext(
				AppConfig.class);

		CustomerBo customer = (CustomerBo) context.getBean("customer");
		customer.printMsg("Hello 11");

		SchedulerBo scheduler = (SchedulerBo) context.getBean("scheduler");
		scheduler.printMsg("Hello 22");

	}
}

輸出結果

CustomerBo : Hello 11
SchedulerBo : Hello 22

下載程式碼 – http://pan.baidu.com/s/1basJTk