XML注入方式

1.set 方式注入  2.构造方式注入  3.工厂方式注入

set 方式注入

1.ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");

2.public class UserDaoImpl implements UserDao；

3.private UserDao dao;

ClassPathXmlApplicationContext 创建了一个 spring 容器后，产生  UserDao 和 dao  对象，并且将 UserDao对象 设置到 dao 对象的属性中，这是通过 set 方法设置的

文件目录：

代码：配置文件：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"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
	
	
	<bean id="userDao" class="com.neuedu.dao.impl.UserDaoImpl"></bean>
	<bean id="userService" class="com.neuedu.service.UserService">
	<!-- set方法注入 -->
		<property name="dao" ref="userDao"></property>
	</bean>
</beans>
 

Test.java

package com.neuedu.test;
import com.neuedu.service.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test {

	public static void main(String[] args) {
		
		ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
		//UserService us= (UserService)ac.getBean("userService");
		
	}
 
}

UserDaoImpl.java

package com.neuedu.dao.impl;
import com.neuedu.dao.UserDao;
public class UserDaoImpl implements UserDao{
	public UserDaoImpl() {
		System.out.println("UserDaoImpl构造方法...");
	}
	
	public void save() {
		System.out.println("通过oracle数据库将用户信息保存到数据库中");
	}
	
	
}

UserService.java

package com.neuedu.service;
import com.neuedu.dao.UserDao;
import com.neuedu.dao.impl.UserDaoImpl;
public class UserService {
	
	public UserService() {
		System.out.println("UserService 构造方法..."); 
	}
	private UserDao dao;
	
	public void save() {
		dao.save();
		
		
		
	}

	public void setDao(UserDao dao) {
		System.out.println("setUserDao...");
		this.dao = dao;
	}
}
 

UserDao.java

package com.neuedu.dao;

public interface UserDao {
	 public void save();
}

输出：

构造器方式注入（必须有带参数的构造方法才可以）

代码：配置文件：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"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
	
	
	<bean id="userDao" class="com.neuedu.dao.impl.UserDaoImpl"></bean>
	<bean id="userService" class="com.neuedu.service.UserService">
	<!-- set方法注入 -->
		<!-- <property name="dao" ref="userDao"></property> -->
		<!-- 构造方法注入 -->
		<constructor-arg ref="userDao"></constructor-arg>
	</bean>
</beans>
 

UserService.java

package com.neuedu.service;
import com.neuedu.dao.UserDao;
import com.neuedu.dao.impl.UserDaoImpl;
public class UserService {
	private UserDao dao;
	public UserService() {
		System.out.println("UserService 构造方法..."); 
	}
	public UserService(UserDao dao) {
		System.out.println("带参数的UserService");
		this.dao = dao;
	}	
	public void save() {
		dao.save();	
	}
	public void setDao(UserDao dao) {
		System.out.println("setUserDao...");
		this.dao = dao;
	}
}
 

输出：

XML注入类型

1.简单属性  2. 对象  3.集合

简单属性

文件目录：

代码：配置文件：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"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
	
	
	<bean id="userDao" class="com.neuedu.dao.impl.UserDaoImpl"></bean>
	<bean id="userService" class="com.neuedu.service.UserService">
	<!-- set方法注入 -->
		<!-- <property name="dao" ref="userDao"></property> -->
		<!-- 构造方法注入 -->
		<constructor-arg ref="userDao"></constructor-arg>
	</bean>
	<bean id="person" class="com.neudeu.po.Person">
		<property name="name" value="zhang"></property>
		<property name="age" value="30"></property>
	</bean>
</beans>
 

Test.java

package com.neuedu.test;
import com.neudeu.po.Person;
import com.neuedu.service.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test {

	public static void main(String[] args) {
		
		ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
		//UserService us= (UserService)ac.getBean("userService");
		Person person = ac.getBean(Person.class);
		System.out.println(person);
	}
 
}

Person.java

package com.neudeu.po;

public class Person {
	private String name;
	private int age;
	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 "Person [name=" + name + ", age=" + age + "]";
	}
}

输出：

集合

文件目录：

代码：配置文件：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"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
	
	
	<bean id="userDao" class="com.neuedu.dao.impl.UserDaoImpl"></bean>
	<bean id="userService" class="com.neuedu.service.UserService">
	<!-- set方法注入 -->
		<!-- <property name="dao" ref="userDao"></property> -->
		<!-- 构造方法注入 -->
		<constructor-arg ref="userDao"></constructor-arg>
	</bean>
	<bean id="FLL" class="com.neudeu.po.Car">
		<property name="brand" value="法拉利"></property>
		<property name="price" value="3000000"></property>
	</bean>
	
	<bean id="BW" class="com.neudeu.po.Car">
		<property name="brand" value="宝马"></property>
		<property name="price" value="300000"></property>
	</bean>
	
	<bean id="BYD" class="com.neudeu.po.Car">
		<property name="brand" value="比亚迪"></property>
		<property name="price" value="30000"></property>
	</bean>
	
	<bean id="person" class="com.neudeu.po.Person">
		<property name="name" value="zhang"></property>
		<property name="age" value="30"></property>
		<property name="cars">
			<list>
				<ref bean="FLL"/>
				<ref bean="BW"/>
				<ref bean="BYD"/>
			</list>
		</property>
	</bean>
</beans>
 

Person.java

package com.neudeu.po;

import java.util.List;

public class Person {
	private String name;
	private int age;
	
	private List<Car> cars;
	
	public List<Car> getCars() {
		return cars;
	}
	public void setCars(List<Car> cars) {
		this.cars = cars;
	}
	@Override
	public String toString() {
		return "Person [name=" + name + ", age=" + age + ", cars=" + cars + "]";
	}
	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;
	}
	
	
}

Car.java

package com.neudeu.po;

public class Car {
	private String brand;
	private double price;
	public String getBrand() {
		return brand;
	}
	public void setBrand(String brand) {
		this.brand = brand;
	}
	public double getPrice() {
		return price;
	}
	public void setPrice(double price) {
		this.price = price;
	}
	@Override
	public String toString() {
		return "Car [brand=" + brand + ", price=" + price + "]";
	}
	
	
}

输出：

代码：配置文件：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"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
	
	
	<bean id="userDao" class="com.neuedu.dao.impl.UserDaoImpl"></bean>
	<bean id="userService" class="com.neuedu.service.UserService">
	<!-- set方法注入 -->
		<!-- <property name="dao" ref="userDao"></property> -->
		<!-- 构造方法注入 -->
		<!-- <constructor-arg ref="userDao"></constructor-arg> -->
		<property name="dao">
			<bean class="com.neuedu.dao.impl.UserDaoImpl"></bean>
		</property>
	</bean>
	<bean id="FLL" class="com.neudeu.po.Car">
		<property name="brand" value="法拉利"></property>
		<property name="price" value="3000000"></property>
	</bean>
	
	<bean id="BW" class="com.neudeu.po.Car">
		<property name="brand" value="宝马"></property>
		<property name="price" value="300000"></property>
	</bean>
	
	<bean id="BYD" class="com.neudeu.po.Car">
		<property name="brand" value="比亚迪"></property>
		<property name="price" value="30000"></property>
	</bean>
	
	<bean id="person" class="com.neudeu.po.Person">
		<property name="name" value="zhang"></property>
		<property name="age" value="30"></property>
		<property name="cars">
			<list>
				<bean class="com.neudeu.po.Car">
					<property name="brand" value="红旗"></property>
					<property name="price" value="300000"></property>
				</bean>
				<ref bean="FLL"/>
				<ref bean="BW"/>
				<ref bean="BYD"/>
			</list>
		</property>
	</bean>
</beans>
 

Test.java

package com.neuedu.test;
import com.neudeu.po.Person;
import com.neuedu.service.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test {

	public static void main(String[] args) {
		
		ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
		
	}
 
}

输出：