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1，Set注入 2，构造注入
Set方法注入：
原理：通过类的setter方法完成依赖关系的设置
name属性的取值依setter方法名而定，要求这个类里面这个对应的属性必须有setter方法。
Set方法注入时spring中配置文件：
<?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:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<bean id="car" class="org.spring01.Car">
<constructor-arg value="奔驰"></constructor-arg>
<constructor-arg type="java.lang.String">
<value>土豪金</value>
</constructor-arg>
<constructor-arg value="高级轿车"></constructor-arg>
</bean>
<bean id="person" class="org.spring01.Person">
<property name="name" value="张三"></property>
<property name="age" value="11"></property>
<property name="car" ref="car"></property>
</bean>
</beans>
</div>
定义Car类：
package org.spring01;
public class Car {
private String name;//车名
private String color;//颜色
private String clas;//等级
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getColor() {
return color;
}
public void setColor(String color) {
this.color = color;
}
public String getClas() {
return clas;
}
public void setClas(String clas) {
this.clas = clas;
}
public Car(String name, String color, String clas) {
super();
this.name = name;
this.color = color;
this.clas = clas;
}
public Car() {
super();
// TODO Auto-generated constructor stub
}
@Override
public String toString() {
return "Car [name=" + name + ", color=" + color + ", clas=" + clas
+ "]";
}
}
</div>
定义Person类：
package org.spring01;
public class Person {
private String name;//名字
private int age;//年龄
private Car car;//他的车
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;
}
public Car getCar() {
return car;
}
public void setCar(Car car) {
this.car = car;
}
public Person(String name, int age, Car car) {
super();
this.name = name;
this.age = age;
this.car = car;
}
public Person() {
super();
// TODO Auto-generated constructor stub
}
@Override
public String toString() {
return "Person [name=" + name + ", age=" + age + ", car=" + car + "]";
}
}
</div>
测试类：
package org.spring01;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class SpringTest{
@Test
public void toGetPerson(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
Person person = (Person) context.getBean("person");
System.out.println(person);
}
@Test
public void toGetCar(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
Car car = (Car) context.getBean("car");
System.out.println(car);
}
}
</div>
使用单元测试（JUnit）测试toGetPerson()方法，结果为：
Person [name=张三, age=11, car=Car [name=奔驰, color=土豪金, clas=高级轿车]]</div>
构造方法注入：
原理：通过构造函数完成依赖关系的设定
构造注入指的是在接受注入的类中，定义一个构造方法，并在构造方法的参数中定义需要注入的元素，其中，index表示构造方法中的参数索引(第一个参数索引为0)。
构造方法注入时spring中配置文件：
<?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:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<bean id="car" class="org.spring02.Car">
<constructor-arg value="大众"></constructor-arg>
<constructor-arg type="java.lang.String">
<value>白色</value>
</constructor-arg>
<constructor-arg value="中级轿车"></constructor-arg>
</bean>
<bean id="person" class="org.spring02.Person">
<constructor-arg index="0" value="李四"></constructor-arg>
<constructor-arg index="1" value="23"></constructor-arg>
<constructor-arg index="2" ref="car"></constructor-arg>
</bean>
</beans>
</div>
定义Car类：
package org.spring02;
public class Car {
private String name;//车名
private String color;//颜色
private String clas;//等级
public Car(String name, String color, String clas) {
super();
this.name = name;
this.color = color;
this.clas = clas;
}
public Car() {
super();
// TODO Auto-generated constructor stub
}
@Override
public String toString() {
return "Car [name=" + name + ", color=" + color + ", clas=" + clas
+ "]";
}
}
</div>
定义Person类：
package org.spring02;
public class Person {
private String name;//名字
private int age;//年龄
private Car car;//他的车
public Person(String name, int age, Car car) {
super();
this.name = name;
this.age = age;
this.car = car;
}
public Person() {
super();
// TODO Auto-generated constructor stub
}
@Override
public String toString() {
return "Person [name=" + name + ", age=" + age + ", car=" + car + "]";
}
}
</div>
测试类：
package org.spring02;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class SpringTest{
@Test
public void toGetPerson(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext01.xml");
Person person = (Person) context.getBean("person");
System.out.println(person);
}
@Test
public void toGetCar(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext01.xml");
Car car = (Car) context.getBean("car");
System.out.println(car);
}
}
</div>
使用单元测试（JUnit）测试toGetPerson()方法，结果为：