1、值注入
創建我們要使用的User類：

package cn.it.bean;public class User {private String name;@Overridepublic String toString() {return "User [name=" + name + ", age=" + age + "]";}private int age; // private Car car; // // public Car getCar() { // return car; // } // // public void setCar(Car car) { // this.car = car; // }public User() {System.out.println("無參構造方法");}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;}}

在配置文件里配置：

<bean name="user" class="cn.it.bean.User"><property name="name" value="tom"></property><property name="age" value="18"></property></bean>

寫一個測試類：

package cn.it.injection;import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext;import cn.it.bean.User;public class Demo {@Testpublic void fun() {ApplicationContext ac = new ClassPathXmlApplicationContext("cn/it/injection/applicationContext.xml");User user = (User) ac.getBean("user");System.out.println(user);} }

運行結果：

2、引用類型注入;
在編寫一個新的Car類：

package cn.it.bean;public class Car {private String name;private String color;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;}@Overridepublic String toString() {return "Car [name=" + name + ", color=" + color + "]";}}

將User類改成如下代碼：

package cn.it.bean;public class User {private String name;private int age;private Car car;public Car getCar() {return car;}public void setCar(Car car) {this.car = car;}public User() {System.out.println("無參構造方法");}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;}@Overridepublic String toString() {return "User [name=" + name + ", age=" + age + ", car=" + car + "]";}}

在配置文件里配置如下：

<bean name="user" class="cn.it.bean.User"><property name="name" value="tom"></property><property name="age" value="18"></property><property name="car" ref="car"></property></bean><bean name="car" class="cn.it.bean.Car"><property name="name" value="寶馬"></property><property name="color" value="紅色"></property></bean>

上面的測試類不用改變，直接運行，結果如下：

總結

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