把 Spring 的 Bean Configuration File 根据模块分散到不同的文件里，便于管理，然后使用 <import> 把它们组织在一起。例如：
| Bean |
Bean Configuration File |
| user |
spring-beans.xml |
| address |
spring-beans-1.xml |
| customer |
spring-beans-2.xml |
在 spring-beans.xml 里 import spring-beans-1.xml and spring-beans-2.xml，然后 Spring Context 加载 spring-beans.xml。
Bean 在配置文件中定义的顺序任意，其实最后就是把所有的配置文件和成一个大的配置文件，然后在解析创建对象，所以就像在单一的配置文件里定义 Bean 一样顺序不重要。
spring-beans-1.xml
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| <?xml version="1.0" encoding="UTF-8"?>
<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.xsd">
<bean id="address" class="com.xtuer.beans.Address">
<property name="country" value="China"/>
</bean>
</beans>
|
spring-beans-2.xml
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| <?xml version="1.0" encoding="UTF-8"?>
<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.xsd">
<bean id="customer" class="com.xtuer.beans.Customer">
<constructor-arg value="Alice"/>
<constructor-arg value="40"/>
<constructor-arg value="1234567"/>
</bean>
</beans>
|
spring-beans.xml
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| <?xml version="1.0" encoding="UTF-8"?>
<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.xsd">
<import resource="classpath:spring-beans-1.xml"/>
<import resource="classpath:spring-beans-2.xml"/>
<bean id="user" class="com.xtuer.beans.User">
<property name="username" value="Alice"/>
<property name="address" ref="address"/>
</bean>
</beans>
|
import 用于引入另外一个配置文件
resource 为配置文件的路径
classpath: 指在 classpath 下搜索配置文件
classpath*: 指在 classpath 下 和 jar 包中搜索配置文件
测试
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| import com.xtuer.beans.Address;
import com.xtuer.beans.Customer;
import com.xtuer.beans.User;
import com.xtuer.util.CommonUtils;
import org.junit.BeforeClass;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MultipleBeanConfigurationFilesTest {
private static ApplicationContext context;
@BeforeClass
public static void setup() {
context = new ClassPathXmlApplicationContext("spring-beans.xml");
}
@Test
public void testGetCustomer() {
Customer customer = context.getBean("customer", Customer.class);
CommonUtils.output(customer);
}
@Test
public void testGetUser() {
User user = context.getBean("user", User.class);
CommonUtils.output(user);
}
@Test
public void testGetAddress() {
Address address = context.getBean("address", Address.class);
CommonUtils.output(address);
}
}
|
输出
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| {
"id" : 0,
"country" : "China",
"province" : null,
"street" : null
}
{
"id" : 0,
"username" : "Alice",
"password" : null,
"address" : {
"id" : 0,
"country" : "China",
"province" : null,
"street" : null
}
}
{
"name" : "Alice",
"age" : 40,
"telephone" : "1234567"
}
|
