标签：打电话 class classpath 1.0 ring turn 方法调用 property 调用
Spring的依赖注入可以是我们不需要去管理bean，网上看到一个回答很精辟：
现在你需要买一把锤子:
1、自己做一把，解释成java就是，调用者创建被调用着，也就是自己去创造一个造锤子的方法，然后自己调用；
2、自己找到生产锤子的工厂，然后问工厂买。就是工厂模式；
3、可以打电话给商店，让商店给自己送一把锤子过来，这就是sping的依赖注入;
第一种方法调用者创建被调用者，两者之前无法实现松耦合；
第二种方法调用者无须关心被调用者具体实现过程，只需要找到符合某种标准(接口)的实例，即可使用；
第三种调用者无须自己定位工厂，程序运行到需要被调用者时，系统自动提供被调用者实例。调用者和被调用者通过spring管理。他们的关系由spring维护
model
package com.hongcong.model; public class People { private int id; private String name; private int age; public People() { super(); // TODO Auto-generated constructor stub } public People(int id, String name, int age) { super(); this.id = id; this.name = name; this.age = age; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } @Override public String toString() { return "People [id=" + id + ", name=" + name + ", age=" + age + "]"; } }
beans.xml
<?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"> <!--属性注入 --> <bean id="people1" class="com.hongcong.model.People"> <property name="id" value="1"/> <property name="name" value="小一"/> <property name="age" value="11"/> </bean> <!-- 构造方法类型注入 --> <bean id="people2" class="com.hongcong.model.People"> <constructor-arg type="int" value="2"></constructor-arg> <constructor-arg type="String" value="小二"></constructor-arg> <constructor-arg type="int" value="22"></constructor-arg> </bean> <!-- 构造方法顺序注入 --> <bean id="people3" class="com.hongcong.model.People"> <constructor-arg index="0" value="3"></constructor-arg> <constructor-arg index="1" value="小三"></constructor-arg> <constructor-arg index="2" value="33"></constructor-arg> </bean> <!-- 工厂注入 --> <bean id="peopleFactory" class="com.hongcong.factory.PeopleFactory"></bean> <bean id="people4" factory-bean="peopleFactory" factory-method="CreatePeople"></bean> <bean id="people5" class="com.hongcong.factory.PeopleFactory" factory-method="CreatePeopleByStatic"></bean> </beans>
执行类
package com.hongcong.test; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.hongcong.model.People; public class test { public static void main(String[] args) { ClassPathXmlApplicationContext ca = new ClassPathXmlApplicationContext("beans.xml"); //属性注入 People people1 = (People)ca.getBean("people1"); System.out.println(people1); //构造方法type注入 People people2 = (People)ca.getBean("people2"); System.out.println(people2); //构造方法顺序注入 People people3 = (People)ca.getBean("people3"); System.out.println(people3); //非静态工厂 People people4 = (People)ca.getBean("people4"); System.out.println(people4); //静态工厂注入 People people5 = (People)ca.getBean("people5"); System.out.println(people5); } }
工厂
package com.hongcong.factory; import com.hongcong.model.People; public class PeopleFactory { public People CreatePeople(){ People people = new People(); people.setId(4); people.setName("小四"); people.setAge(44); return people; } public static People CreatePeopleByStatic(){ People people = new People(); people.setId(5); people.setName("小五"); people.setAge(55); return people; } }
标签：打电话 class classpath 1.0 ring turn 方法调用 property 调用
原文地址：http://www.cnblogs.com/hongcong/p/7587604.html
