Spring 一二事

Posted 2020-06-27 风间影月の技术小站

静态工厂方法及实例工厂的使用：

applicationContext.xml：

 1 　　 <!-- factory-method 是指调用静态工厂方法 -->
 2     <bean id="helloWorld2" class="com.lee.spring002.createobject.method.HelloWorldFactory"
 3         factory-method="getInstance"></bean>
 4 
 5     <!-- 实例工厂 -->
 6     <bean id="helloWorldFactory"
 7         class="com.lee.spring002.createobject.method.HelloWorldFactory2"></bean>
 8     <!-- factory-bean 是一个工厂bean -->
 9     <bean id="helloWorld3" factory-bean="helloWorldFactory"
10         factory-method="getInstance"></bean>

HelloWorldFactory.java

 1 package com.lee.spring002.createobject.method;
 2 
 3 import com.lee.spring001.createobject.HelloWorld;
 4 
 5 public class HelloWorldFactory {
 6 
 7     public static HelloWorld getInstance() {
 8         return new HelloWorld();
 9     }
10 }

HelloWorldFactory2.java

 1 package com.lee.spring002.createobject.method;
 2 
 3 import com.lee.spring001.createobject.HelloWorld;
 4 
 5 public class HelloWorldFactory2 {
 6 
 7     public HelloWorld getInstance() {
 8         return new HelloWorld();
 9     }
10 }

测试：

 1     @Test
 2     public void testHelloWorld_StaticFactory() {
 3 
 4         ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
 5         
 6         HelloWorld hello = (HelloWorld)context.getBean("helloWorld2");
 7         hello.hello();
 8     }
 9     
10     @Test
11     public void testHelloWorld_InstanceFactory() {
12 
13         ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
14         
15         HelloWorld hello = (HelloWorld)context.getBean("helloWorld3");
16         hello.hello();
17     }

 github地址：https://github.com/leechenxiang/maven-spring001-helloworld