1.构造器注入:已经了解过
2.Set方式注入:
依赖注入:Set注入
依赖:bean对象的创建依赖于容器
注入:bean对象中的所有属性,由容器来注入
环境搭建:
复杂类型
public class Address {
private String address;
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
真实测试对象
private String name;
private Address address;
private String[] books;
private List<String > hobbys;
private Map<String ,String> card;
private Set<String> games;
private Properties info;
private String wife;
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">
<bean id="student" class="com.dai.pojo.Student">
<property name="name" value="戴"/>
</bean>
</beans>
测试类:
public class MyTest {
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
Student student = (Student) context.getBean("student");
System.out.println(student.getName());
}
}
完善注入信息:
<bean id="address" class="com.dai.pojo.Address"/>
<bean id="student" class="com.dai.pojo.Student">
<property name="name" value="戴"/>
<!-- 第二种,Bean注入,ref-->
<property name="address" ref="address"/>
<!-- 数组注入-->
<property name="books">
<array>
<value>三国</value>
<value>红楼梦</value>
<value>水浒传</value>
<value>西游记</value>
</array>
</property>
<!-- List注入-->
<property name="hobbys">
<list>
<value>听歌</value>
<value>写作业</value>
<value>打游戏</value>
</list>
</property>
<!-- Map注入-->
<property name="card">
<map>
<entry key="身份证" value="1111"/>
<entry key="银行卡" value="2222"/>
<entry key="公交卡" value="3333"/>
</map>
</property>
<!-- set注入-->
<property name="games">
<set>
<value>LOL</value>
<value>CS</value>
</set>
</property>
<!-- null-->
<property name="wife">
<null></null>
</property>
<!-- Properties-->
<property name="info">
<props>
<prop key="学号">11</prop>
<prop key="性别">男</prop>
</props>
</property>
</bean>
bean的作用域:
1.单例模式(Spring默认机制)
<bean id="student" class="com.dai.pojo.Student"
scope="singleton">
2.原型模式:每次从容器中get的时候,都会产生一个新对象
<bean id="student" class="com.dai.pojo.Student"
scope="prototype">
3.其余的request、session、application这些只能在web开发中使用到