Spring两种注入

向右看齐 2021-11-26 08:54 293阅读 0赞

## 1通过构造函数注入 ##

![在这里插入图片描述][20190723205851529.png]  
1建立pojo

package com.baidu.pojo;
    
    public class Car {
        public Car(String name, double price) {
            this.name = name;
            this.price = price;
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public double getPrice() {
            return price;
        }
    
        public void setPrice(double price) {
            this.price = price;
        }
    
        private  String  name;
        private  double price;
    
    
    }

2xml配置

<?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:context="http://www.springframework.org/schema/context"
           xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans.xsd
           http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context.xsd">
    
    <bean id="car" class="com.baidu.pojo.Car">
       <constructor-arg index="0" value="宝马" ></constructor-arg>
        <constructor-arg index="1" value="200000" ></constructor-arg>
      
    </bean>
    
    </beans>

3测试类

package com.baidu.test;
    
    import com.baidu.pojo.Car;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class TestCar {
        public static void main(String[] args) {
    
            ApplicationContext applicationContext = new ClassPathXmlApplicationContext
                    ("applicationContext.xml");
            Car car = applicationContext.getBean(Car.class);
    
            System.out.println(car.getName()+"-------------"+car.getPrice());
    
        }
    }

4结果

宝马-------------200000
    
    Process finished with exit code 0

## 2使用Setter方法注入 ##

![在这里插入图片描述][20190723205920888.png]

## 1建立pojo Car2 ##

package com.baidu.pojo;
    
    import java.util.List;
    
    public class Car2 {
        public Car2() {
    
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public double getPrice() {
            return price;
        }
    
        public void setPrice(double price) {
            this.price = price;
        }
    
        private  String  name;
        private  double price;
    
        public Person getP() {
            return p;
        }
    
        public void setP(Person p) {
            this.p = p;
        }
    
        private  Person p;
        public List<String> getLists() {
            return lists;
        }
    
        public void setLists(List<String> lists) {
            this.lists = lists;
        }
    
        private List<String> lists;
    }

## 2xml文件：applicationContext.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"
           xmlns:context="http://www.springframework.org/schema/context"
           xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans.xsd
           http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context.xsd">
            
    <bean id="car2" class="com.baidu.pojo.Car2">
        <property name="name" value="本次"></property>
        <property name="price" value="2.0"></property>
    
       
        <property name="p" ref="person"></property>
    </bean>
    
    </beans>

## 3测试文件 ##

package com.baidu.test;
    
    import com.baidu.pojo.Car;
    import com.baidu.pojo.Car2;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class TestCar2 {
        public static void main(String[] args) {
    
            ApplicationContext applicationContext = new ClassPathXmlApplicationContext
                    ("applicationContext.xml");
            Car2 car2 = applicationContext.getBean(Car2.class);
    
            System.out.println(car2.getP().getName());
    
        }
    }

## 4结果 ##

李华
    
    Process finished with exit code 0

[20190723205851529.png]: /images/20211126/b2a70aa9fc834c10a0d5b8ba71421e5c.png
[20190723205920888.png]: /images/20211126/1a6e3d15e5e7409c9099062bef394666.png