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 ClassPath ApplicationContext("applicationContext. ");

2.public class UserDaoImpl implements UserDao；

3.private UserDao dao;

ClassPath ApplicationContext 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.

<?  version="1.0" encoding="UTF-8"?><beans  ns="http://www.spring work.org/schema/beans"	 ns:xsi="http://www.w3.org/2001/ Schema-instance"	xsi:schemaLocation="http://www.spring work.org/schema/beans http://www.spring work.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.spring work.context.ApplicationContext;import org.spring work.context.support.ClassPath ApplicationContext;public class Test {	public static void main(String[] args) {				ApplicationContext ac = new ClassPath ApplicationContext("applicationContext. ");		//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.

<?  version="1.0" encoding="UTF-8"?><beans  ns="http://www.spring work.org/schema/beans"	 ns:xsi="http://www.w3.org/2001/ Schema-instance"	xsi:schemaLocation="http://www.spring work.org/schema/beans http://www.spring work.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：

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.

<?  version="1.0" encoding="UTF-8"?><beans  ns="http://www.spring work.org/schema/beans"	 ns:xsi="http://www.w3.org/2001/ Schema-instance"	xsi:schemaLocation="http://www.spring work.org/schema/beans http://www.spring work.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.spring work.context.ApplicationContext;import org.spring work.context.support.ClassPath ApplicationContext;public class Test {	public static void main(String[] args) {				ApplicationContext ac = new ClassPath ApplicationContext("applicationContext. ");		//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.

<?  version="1.0" encoding="UTF-8"?><beans  ns="http://www.spring work.org/schema/beans"	 ns:xsi="http://www.w3.org/2001/ Schema-instance"	xsi:schemaLocation="http://www.spring work.org/schema/beans http://www.spring work.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.

<?  version="1.0" encoding="UTF-8"?><beans  ns="http://www.spring work.org/schema/beans"	 ns:xsi="http://www.w3.org/2001/ Schema-instance"	xsi:schemaLocation="http://www.spring work.org/schema/beans http://www.spring work.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.spring work.context.ApplicationContext;import org.spring work.context.support.ClassPath ApplicationContext;public class Test {	public static void main(String[] args) {				ApplicationContext ac = new ClassPath ApplicationContext("applicationContext. ");			} }

输出：