静态工厂:
调用静态工厂方法创建Bean是将对象创建的过程封装到静态方法中,当需要请求对象时,只需要调用静态方法即可。
案例实现代码:
创建一个静态工厂:
public class MyBeanFactory {
/*
创建实例
需要为静态方法
*/
public static UserService createService(){
return new UserServiceImpl();
}
}
UserService接口与UserServiceImpl实现类:
public interface UserService {
public void addUser();
}
public class UserServiceImpl implements UserService {
@Override
public void addUser() {
System.out.println("b_static_factory");
}
}
在beans.xml配置静态工厂:
<?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">
<!--将静态工厂创建的实例交予spring
class 确定静态工厂全限定类名
factory-method 确定静态方法名
-->
<bean id="UserServiceId" class="com.spring.c_inject.b_static_factory.MyBeanFactory" factory-method="createService"></bean>
</beans>
测试实现类:
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class TestStaticFactory {
@Test
public void demo01() {
//自定义工厂
UserService userService = MyBeanFactory.createService();
userService.addUser();
}
@Test
public void demo02() {
//spring工厂
String xmlPath = "com/spring/c_inject/b_static_factory/beans.xml";
ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlPath);
UserService userService = applicationContext.getBean("UserServiceId",UserService.class);//这样就不用强转了
userService.addUser();
}
}
实例工厂:
将对象的创建过程封装到另外一个对象实例的方法里,当需要请求对象时, 只需要调用该实例方法。
案例实现代码:
创建一个实例工厂:
/**
* 实例工厂,所有方法非静态
*/
public class MyBeanFactory {
/*
创建实例
*/
public UserService createService(){
return new UserServiceImpl();
}
}
UserService接口与UserServiceImpl实现类:
public interface UserService {
public void addUser();
}
public class UserServiceImpl implements UserService {
@Override
public void addUser() {
System.out.println("c_factory");
}
}
在beans.xml配置实例工厂:
<?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">
<!--创建工厂实例-->
<bean id="myBeanFactoryId" class="com.spring.c_inject.c_factory.MyBeanFactory" ></bean>
<!--获得userservice
* factory-bean 确定工厂实例
* factory-method 确定普通方法
-->
<bean id="UserServiceId" factory-bean="myBeanFactoryId" factory-method="createService" ></bean>
</beans>
测试实现类:
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class TestFactory {
@Test
public void demo01() {
//自定义工厂
//1.创建工厂
MyBeanFactory myBeanFactory = new MyBeanFactory();
//2.通过工厂实例,获得对象
UserService userService = myBeanFactory.createService();
userService.addUser();
}
@Test
public void demo02() {
//spring工厂
String xmlPath = "com/spring/c_inject/c_factory/beans.xml";
ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlPath);
UserService userService = applicationContext.getBean("UserServiceId", UserService.class);//这样就不用强转了
userService.addUser();
}
}