一、装配一个bean
二、依赖注入的几种方式
com.cy.entity People.java:
package com.cy.entity;
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 + "]";
}
}
spring管理bean的xml： 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="helloWorld" class="com.cy.test.HelloWorld"></bean> <!-- 装配一个bean -->
<bean id="people" class="com.cy.entity.People"></bean> <!-- 依赖注入 -->
<!-- 属性注入 -->
<bean id="people2" class="com.cy.entity.People">
<property name="id" value="1"></property>
<property name="name" value="张三"></property>
<property name="age" value="11"></property>
</bean> <!-- 构造函数注入 通过类型-->
<bean id="people3" class="com.cy.entity.People">
<constructor-arg type="int" value="2"></constructor-arg>
<constructor-arg type="String" value="李四"></constructor-arg>
<constructor-arg type="int" value="22"></constructor-arg>
</bean>
<!-- 构造函数注入 通过索引-->
<bean id="people4" class="com.cy.entity.People">
<constructor-arg index="0" value="3"></constructor-arg>
<constructor-arg index="1" value="王五"></constructor-arg>
<constructor-arg index="2" value="55"></constructor-arg>
</bean>
<!-- 构造函数注入 类型 索引联合使用-->
<bean id="people5" class="com.cy.entity.People">
<constructor-arg index="0" type="int" value="4"></constructor-arg>
<constructor-arg index="1" type="String" value="招六"></constructor-arg>
<constructor-arg index="2" type="int" value="66"></constructor-arg>
</bean> <!-- 工厂方法注入 非静态工厂 -->
<bean id="peopleFactory" class="com.cy.factory.PeopleFactory"></bean>
<bean id="people6" factory-bean="peopleFactory" factory-method="createPeople"></bean> <!-- 工厂方法注入 静态工厂 -->
<bean id="people7" class="com.cy.factory.PeopleFactory2" factory-method="createPeople"></bean>
</beans>
com.cy.factory下的
静态工厂：PeopleFactory2.java:
package com.cy.factory;
import com.cy.entity.People; public class PeopleFactory2 {
public static People createPeople(){
People people = new People();
people.setId(6);
people.setName("小八");
people.setAge(88);
return people;
}
}
非静态工厂：PeopleFactory.java:
package com.cy.factory;
import com.cy.entity.People; public class PeopleFactory {
public People createPeople(){
People people = new People();
people.setId(5);
people.setName("小七");
people.setAge(77);
return people;
}
}
测试代码：
package com.cy.service; import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext; import com.cy.entity.People; public class Test {
@SuppressWarnings("resource")
public static void main(String[] args) {
ApplicationContext ac =new ClassPathXmlApplicationContext("beans.xml");
People people = (People) ac.getBean("people");
System.out.println(people); //属性注入
People people2 = (People) ac.getBean("people2");
System.out.println(people2); //构造函数注入 通过类型
People people3 = (People) ac.getBean("people3");
System.out.println(people3); //工厂方法注入 非静态工厂
People people6 = (People) ac.getBean("people6");
System.out.println(people6); //工厂方法注入 静态工厂
People people7 = (People) ac.getBean("people7");
System.out.println(people7); }
}
console打印：