Spring JavaConfig @Import實例

一般來說, 需要按模塊或類別  分割Spring XML bean文件 成多個小文件, 使事情更容易維護和模塊化。 例如,

<import resource="config/customer.xml"/>
    <import resource="config/scheduler.xml"/>

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實例

請參閱使用 JavaConfig @Import的一個完整的例子。

1. 目錄結構

本實例目錄結構。

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示例

現在,使用JavaConfig @Configuration聲明上述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示例

使用@Import加載多個配置文件。

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. 執行程序

加載主配置文件,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

下載代碼 –  http://pan.baidu.com/s/1basJTk