跟银龙一起学spring(02)

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3.spring属性注入

set方法注入

构造函数注入

p名称空间注入

spel注入(Spring Expression Language)

3.1  set方法注入

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">

	<!-- set方式注入: -->

	<bean name="user" class="cn.yl.bean.User">
		<!-- 值类型注入:为User对象中名为name的属性注入tom作为值 -->
		<property name="name" value="tom"></property>
		<property name="age" value="18"></property>
		<!-- 引用类型注入:才car属性注入下方配置的car对象 -->
		<property name="car" ref="car1"></property>
	</bean>

	<!-- 将car对象配置到容器中 -->
	<bean name="car1" class="cn.yl.bean.Car">
		<property name="name" value="兰博基尼"></property>
		<property name="color" value="黄色"></property>
	</bean>




</beans>

User.java

package cn.yl.bean;

public class User {
	private String name;
	private Integer age;
	private Car car;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Car getCar() {
		return car;
	}

	public void setCar(Car car) {
		this.car = car;
	}

	public Integer getAge() {
		return age;
	}

	public void setAge(Integer age) {
		this.age = age;
	}

	public User() {
		System.out.println("User对象空参构造方法\r\n-----------------\r\n");
		// TODO Auto-generated constructor stub
	}

	public void init() {
		System.out.println("我是初始化方法");

	}

	public void destroy() {
		System.out.println("我是銷毀方法");

	}

	@Override
	public String toString() {
		return "User [name=" + name + ", age=" + age + ", car=" + car + "]";
	}

}

Car.java

package cn.yl.bean;

public class Car {
	@Override
	public String toString() {
		return "Car [name=" + name + ", color=" + color + "]";
	}

	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;
	}
}

Demo.java

package cn.yl.c_injection;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import cn.yl.bean.User;

public class Demo {

	@Test
	public void fun1() {
		
		//1创建容器对象
		ApplicationContext ac =new ClassPathXmlApplicationContext("cn/yl/c_injection/applicationContext.xml");
		
		//2向其 要 user對象
		User user=(User)ac.getBean("user");
		//3打印
		System.out.println(user);
	}
}

debug

User对象空参构造方法
-----------------

User [name=tom, age=18, car=Car [name=兰博基尼, color=黄色]]

3.2  构造函数注入

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">

	<!-- set方式注入: -->

	<bean name="user" class="cn.yl.bean.User">
		<!-- 值类型注入:为User对象中名为name的属性注入tom作为值 -->
		<property name="name" value="tom"></property>
		<property name="age" value="18"></property>
		<!-- 引用类型注入:才car属性注入下方配置的car对象 -->
		<property name="car" ref="car1"></property>
	</bean>

	<!-- 将car对象配置到容器中 -->
	<bean name="car1" class="cn.yl.bean.Car">
		<property name="name" value="兰博基尼"></property>
		<property name="color" value="黄色"></property>
	</bean>
	
	<!-- 构造函数注入 -->
	<bean name="user2" class="cn.yl.bean.User">
	<!-- name属性:构造函数的参数名 -->
	<!-- index属性:构造函数的参数索引-->
	<!-- type属性:构造函数的参数类型-->
	
		<constructor-arg name="999" value="yinlong" index="0" type="java.lang.Integer"></constructor-arg>
		<constructor-arg name="car" ref="car1"></constructor-arg>
	</bean>



</beans>

User.java

package cn.yl.bean;

public class User {
	private String name;
	private Integer age;
	private Car car;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Car getCar() {
		return car;
	}

	public void setCar(Car car) {
		this.car = car;
	}

	public Integer getAge() {
		return age;
	}

	public void setAge(Integer age) {
		this.age = age;
	}

	public User() {
		System.out.println("User对象空参构造方法\r\n-----------------\r\n");
		// TODO Auto-generated constructor stub
	}

	public void init() {
		System.out.println("我是初始化方法");

	}

	public void destroy() {
		System.out.println("我是銷毀方法");

	}

	public User(String name, Car car) {
		System.out.println("User(String name, Car car)");
		this.name = name;
		this.car = car;
	}

	public User(Car car, String name) {
		System.out.println("User(Car car, String name) ");
		this.name = name;
		this.car = car;
	}

	public User(Integer name, Car car) {
		System.out.println("User(Integer name, Car car)");
		this.name = name + "";
		this.car = car;
	}

	@Override
	public String toString() {
		return "User [name=" + name + ", age=" + age + ", car=" + car + "]";
	}

}

3.3  p名称空间注入

<?xml version="1.0" encoding="UTF-8"?>
<beans  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 		xmlns="http://www.springframework.org/schema/beans"
		xmlns:p="http://www.springframework.org/schema/p" 
		xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

	<!-- set方式注入: -->

	<bean name="user" class="cn.yl.bean.User">
		<!-- 值类型注入:为User对象中名为name的属性注入tom作为值 -->
		<property name="name" value="tom"></property>
		<property name="age" value="18"></property>
		<!-- 引用类型注入:才car属性注入下方配置的car对象 -->
		<property name="car" ref="car1"></property>
	</bean>

	<!-- 将car对象配置到容器中 -->
	<bean name="car1" class="cn.yl.bean.Car">
		<property name="name" value="兰博基尼"></property>
		<property name="color" value="黄色"></property>
	</bean>

	<!-- 构造函数注入 -->
	<bean name="user2" class="cn.yl.bean.User">
		<!-- name属性:构造函数的参数名 -->
		<!-- index属性:构造函数的参数索引 -->
		<!-- type属性:构造函数的参数类型 -->

		<constructor-arg name="name" value="999" index="0"
			type="java.lang.Integer"></constructor-arg>
		<constructor-arg name="car" ref="car1"></constructor-arg>
	</bean>

	<!-- p名称空间注入 ,走set方法
	1导入p名称空间 xmlns:p="http://www.springframework.org/schema/p" 
	2使用p:属性完成注入.2.1值类型: p:属性名="值"   2.2引用类型: p:属性名-ref="bean名称"
	-->
	
	<bean name="user3" class="cn.yl.bean.User" p:name="yinlong" p:age="18" p:car-ref="car1"></bean>


</beans>

3.4 spel注入

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://www.springframework.org/schema/beans" xmlns:p="http://www.springframework.org/schema/p"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

	<!-- set方式注入: -->

	<bean name="user" class="cn.yl.bean.User">
		<!-- 值类型注入:为User对象中名为name的属性注入tom作为值 -->
		<property name="name" value="tom"></property>
		<property name="age" value="18"></property>
		<!-- 引用类型注入:才car属性注入下方配置的car对象 -->
		<property name="car" ref="car1"></property>
	</bean>

	<!-- 将car对象配置到容器中 -->
	<bean name="car1" class="cn.yl.bean.Car">
		<property name="name" value="兰博基尼"></property>
		<property name="color" value="黄色"></property>
	</bean>

	<!-- 构造函数注入 -->
	<bean name="user2" class="cn.yl.bean.User">
		<!-- name属性:构造函数的参数名 -->
		<!-- index属性:构造函数的参数索引 -->
		<!-- type属性:构造函数的参数类型 -->

		<constructor-arg name="name" value="999" index="0"
			type="java.lang.Integer"></constructor-arg>
		<constructor-arg name="car" ref="car1"></constructor-arg>
	</bean>

	<!-- p名称空间注入 ,走set方法 1导入p名称空间 xmlns:p="http://www.springframework.org/schema/p" 
		2使用p:属性完成注入.2.1值类型: p:属性名="值" 2.2引用类型: p:属性名-ref="bean名称" -->

	<bean name="user3" class="cn.yl.bean.User" p:name="yinlong" p:age="18"
		p:car-ref="car1"></bean>

	<!-- spel注入 spring Expression Language -->
	<bean name="user4" class="cn.yl.bean.User">
	<property name="name" value="#{user.name}"></property>
	<property name="age" value="#{user.age}"></property>
	<property name="car" ref="car1"></property>
	</bean>

</beans>

复杂类型注入

CollectionBean.java

package cn.itcast.c_injection;

import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Properties;

public class CollectionBean {
	private Object[] arr;//数组类型注入
	private List list;//list/set 类型注入
	private Map map;//map类型注入
	private Properties prop;//properties类型注入
	
	public Object[] getArr() {
		return arr;
	}
	public void setArr(Object[] arr) {
		this.arr = arr;
	}
	public List getList() {
		return list;
	}
	public void setList(List list) {
		this.list = list;
	}
	public Map getMap() {
		return map;
	}
	public void setMap(Map map) {
		this.map = map;
	}
	public Properties getProp() {
		return prop;
	}
	public void setProp(Properties prop) {
		this.prop = prop;
	}
	@Override
	public String toString() {
		return "CollectionBean [arr=" + Arrays.toString(arr) + ", list=" + list + ", map=" + map + ", prop=" + prop
				+ "]";
	}
	
	
}

配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
		xmlns="http://www.springframework.org/schema/beans"
		xmlns:p="http://www.springframework.org/schema/p"
		 xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd ">

	<!-- set方式注入: -->
	<bean  name="user" class="cn.itcast.bean.User" >
		<!--值类型注入: 为User对象中名为name的属性注入tom作为值 -->
		<property name="name" value="tom" ></property>
		<property name="age"  value="18" ></property>
		<!-- 引用类型注入: 为car属性注入下方配置的car对象 -->
		<property name="car"  ref="car" ></property>
	</bean>
	
	<!-- 将car对象配置到容器中 -->
	<bean name="car" class="cn.itcast.bean.Car" >
		<property name="name" value="兰博基尼" ></property>
		<property name="color" value="黄色" ></property>
	</bean>
<!-- ============================================================ -->
	<!-- 构造函数注入 -->
<bean name="user2" class="cn.itcast.bean.User" >
	<!-- name属性: 构造函数的参数名 -->
	<!-- index属性: 构造函数的参数索引 -->
	<!-- type属性: 构造函数的参数类型-->
	<constructor-arg name="name" index="0" type="java.lang.Integer" value="999"  ></constructor-arg>
	<constructor-arg name="car" ref="car" index="1" ></constructor-arg>
</bean>

<!-- ============================================================= -->

<!-- p名称空间注入, 走set方法
	1.导入P名称空间  xmlns:p="http://www.springframework.org/schema/p"
	2.使用p:属性完成注入
		|-值类型: p:属性名="值"
		|-对象类型: p:属性名-ref="bean名称"
 -->
	<bean  name="user3" class="cn.itcast.bean.User" p:name="jack" p:age="20" p:car-ref="car"  >
	</bean>
	
<!-- ============================================================= -->

<!-- 
	spel注入: spring Expression Language sping表达式语言
 -->
<bean  name="user4" class="cn.itcast.bean.User" >
		<property name="name" value="#{user.name}" ></property>
		<property name="age" value="#{user3.age}" ></property>
		<property name="car" ref="car" ></property>
</bean>
<!-- ============================================================= -->
<!-- 复杂类型注入 -->
<bean name="cb" class="cn.itcast.c_injection.CollectionBean" >
	<!-- 如果数组中只准备注入一个值(对象),直接使用value|ref即可 
	<property name="arr" value="tom" ></property>
	-->
	<!-- array注入,多个元素注入 -->
	<property name="arr">
		<array>
			<value>tom</value>
			<value>jerry</value>
			<ref bean="user4" />
		</array>
	</property>
	
	<!-- 如果List中只准备注入一个值(对象),直接使用value|ref即可 
	<property name="list" value="jack" ></property>-->
	<property name="list"  >
		<list>
			<value>jack</value>
			<value>rose</value>
			<ref bean="user3" />
		</list>
	</property>
	<!-- map类型注入 -->
	<property name="map"  >
		<map>
			<entry key="url" value="jdbc:mysql:///crm" ></entry>
			<entry key="user" value-ref="user4"  ></entry>
			<entry key-ref="user3" value-ref="user2"  ></entry>
		</map> 
	</property>
	<!-- prperties 类型注入 -->
	<property name="prop"  >
		<props>
			<prop key="driverClass">com.jdbc.mysql.Driver</prop>
			<prop key="userName">root</prop>
			<prop key="password">1234</prop>
		</props>
	</property>
</bean>





</beans>