一、IOC——setter注入
1、准备dmo
首先准备一只火鸡
public class Turkey {
private int id;
private String name;
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;
}
}
然后准备一个厨房， 属性包含火鸡
public class Cookhouse {
private int id;
private String name;
private Turkey turkey;
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 Turkey getTurkey() {
return turkey;
}
public void setTurkey(Turkey turkey) {
this.turkey = turkey;
}
@Override
public String toString() {
return "Cookhouse{" +
"id=" + id +
", name='" + name + '\'' +
'}';
}
}
2、applicationContext.xml配置
给bean起个名字，class就是dmo类，property name是属性名，value和ref是属性值，如果属性是对象要使用"ref="
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<bean name="t" class="Turkey">
<property name="name" value="usaTurkey"/>
</bean>
<bean name="c" class="Cookhouse">
<property name="name" value="cnCookhouse"/>
<property name="turkey" ref="t"/>
</bean>
</beans>3、添加spring的相关JAR包
JAR包以及其它知识详见网上一个大神的项目：自学网站
4、spring帮我们在厨房做火鸡
让spring帮我在厨房做火鸡吃，spring根据核心配置文件applicationContext.xml创建了一个中国厨房，然后做了只美国火鸡。
public class TestSpring {
public static void main(String[] args) {
ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext(new String[]{"applicationContext.xml"});
Cookhouse c = (Cookhouse)applicationContext.getBean("c");
System.out.println(c.getName()+"做了只"+c.getTurkey().getName());
}
}运行结果：
二、IOC——注解注入
有小伙伴说：火鸡做太慢，等饿了
spring说：那我来用注解注入的方式给你做火鸡
1、@Autowired对属性的注解
首先优化对象的注入方式，applicationContext.xml添加<context:annotation-config/>，表示告诉Spring要用注解的方式进行注入，<property name="turkey" ref="t"/>就可以注释掉了，我们只需要在Cookhouse类的属性Turkey上面加上@Autowired就可以注入火鸡了
@Autowired
private Turkey turkey;2、@Component对Bean的注解
然后优化Bean的注入方式，applicationContext.xml的Bean注入看上去还是比较繁琐，我们再简化下，只新增：
<context:component-scan base-package="com.fantasy.dmo"/>
其作用是告诉Spring，bean都放在这个包下
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<!--bean都放在这个包下-->
<context:component-scan base-package="com.fantasy.dmo"/>
</beans>因为Bean移到dmo了，所以在dmo分别给Cookhouse和Turkey加上注解@Component，然后给它们的属性name命名。
@Component("c")
public class Cookhouse {
private int id;
private String name="cnCookhouse";
@Autowired
private Turkey turkey;
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 Turkey getTurkey() {
return turkey;
}
public void setTurkey(Turkey turkey) {
this.turkey = turkey;
}
@Override
public String toString() {
return "com.fantasy.dmo.Cookhouse{" +
"id=" + id +
", name='" + name + '\'' +
'}';
}
}
@Component("t")
public class Turkey {
private int id;
private String name="usaTurkey";
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;
}
}
运行程序发现结果一样，又省去很多配置，香喷喷的火鸡做的更快了呢~