实体类代码

package cn.edu.zafu;public class Car {private String brand;private String corp;private double price;private int maxSpeed;public Car(String brand, String corp, double price) {this.brand = brand;this.corp = corp;this.price = price;}public Car(String brand, String corp, int maxSpeed) {this.brand = brand;this.corp = corp;this.maxSpeed = maxSpeed;}@Overridepublic String toString() {return "Car [brand=" + brand + ", corp=" + corp + ", price=" + price+ ", maxSpeed=" + maxSpeed + "]";}public double getPrice() {return price;}public void setPrice(double price) {this.price = price;}public String getBrand() {return brand;}public void setBrand(String brand) {this.brand = brand;}public String getCorp() {return corp;}public void setCorp(String corp) {this.corp = corp;}public int getMaxSpeed() {return maxSpeed;}public void setMaxSpeed(int maxSpeed) {this.maxSpeed = maxSpeed;}}

package cn.edu.zafu;public class Person {private String name;private int age;private Car car;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;}@Overridepublic String toString() {return "Person [name=" + name + ", age=" + age + ", car=" + car + "]";}
}

Spring属性注入通过反射创建Bean，要求必须提供一个默认的构造器，在代码中我们通过bean id获得bean

<bean id="helloWorld" class="cn.edu.zafu.HelloWorld"><property name="name" value="lizhangqu"></property>
</bean>

Spring构造器注入，可以使用index表示构造器中的第几个属性，使用type表示构造器参数类型

 <bean id="car" class="cn.edu.zafu.Car"><constructor-arg value="Audi" index="0"></constructor-arg><constructor-arg value="Shanghai" index="1"></constructor-arg><constructor-arg value="30000" index="2"></constructor-arg></bean>

   <bean id="car1" class="cn.edu.zafu.Car"><constructor-arg value="Audi" type="java.lang.String"></constructor-arg><constructor-arg value="Shanghai" type="java.lang.String"></constructor-arg><constructor-arg value="100" type="int"></constructor-arg></bean>

如过value值包含特殊字符，可以包含value标签，使用CDATA

<span style="white-space:pre"> </span><bean id="car2" class="cn.edu.zafu.Car"><constructor-arg value="Audi" type="java.lang.String"></constructor-arg><constructor-arg type="java.lang.String"><value><![CDATA[<ShangHai>]]></value></constructor-arg><constructor-arg value="100" type="int"></constructor-arg></bean>

可以使用ref引用已有的bean

  <bean id="person" class="cn.edu.zafu.Person"><property name="name" value="Tom"></property><property name="age" value="13"></property><property name="car" ref="car2"></property></bean>

也可以使用内部bean

<span style="white-space:pre">    </span><bean id="person1" class="cn.edu.zafu.Person"><property name="name" value="Tom"></property><property name="age" value="13"></property><property name="car"><bean class="cn.edu.zafu.Car"><constructor-arg value="Baoma" type="java.lang.String"></constructor-arg><constructor-arg value="Shanghai" type="java.lang.String"></constructor-arg><constructor-arg value="200" type="int"></constructor-arg></bean></property></bean>

也可以使用级联属性，但是前提是先初始化

<span style="white-space:pre">    </span><bean id="person2" class="cn.edu.zafu.Person"><property name="name" value="Tom"></property><property name="age" value="13"></property><property name="car" ref="car2"></property><property name="car.price" value="3000000"></property></bean>

对于list，map等数据类型，可以只用对应的标签