Spring JavaConfig @Import实例 - Spring教程
一般来说, 需要按模块或类别 分割Spring XML bean文件 成多个小文件, 使事情更容易维护和模块化。 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它等效于 @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实例
请参阅使用JavaConfig @Import的一个完整的例子。
1. 目录结构
本实例目录结构。
2. Spring Beans
两个简单的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
现在，使用JavaConfig @Configuration声明上述Bean类。
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加载多个配置文件。
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. 执行程序
加载主配置文件，并进行测试。
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");
}
}
输出结果
CustomerBo : Hello 11
SchedulerBo : Hello 22