spring框架初级搭建

1.导入jar包

2.编写applicationContext.xml配置文件

<?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:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans.xsd">
	<bean id="userService" class="com.huida.demo.UserServiceImpl" destroy-method="destroy" init-method="init">
		<property name="name" value="张三"></property>
	</bean>
	<!-- 依赖注入 -->
	<bean id="userDao" class="com.huida.demo1.UserDao"></bean>
	<bean id="userService1" class="com.huida.demo1.UserService">
	    <property name="dao" ref="userDao"></property>
	</bean>
	<!-- 构造方法的依赖注入 -->
	<bean id="car1" class="com.huida.demo2.Car1">
	    <constructor-arg name="cname" value="QQ"></constructor-arg>
	    <constructor-arg name="price" value="25000"></constructor-arg>
	</bean>
	<!-- 采用p名称空间注入 -->
	<!-- <bean id="car2" class="com.huida.demo2.Car2" p:cname="保时捷" p:price="1500000"></bean> -->
	<!-- 使用SPEL注入方式
	<bean id="car2" class="com.huida.demo2.Car2" p:cname="保时捷" p:price="1500000">
	    <property name="cname" value="#{'拖拉机'}"></property>
	    <property name="price" value="#{2000}"></property>
	</bean> -->
    <!-- 注入集合 -->
    <bean id="user" class="com.huida.demo2.User">
        <property name="arrs">
           <value>哈哈</value> 
          
           
        </property>
        
    </bean>

</beans>

3.代码测试
UserService

public interface UserService {
	public void sayHello();
}

UserServiceImpl

public class UserServiceImpl implements UserService{

	private String name;
	
	public void setName(String name) {
		this.name = name;
	}
	@Override
	public void sayHello() {
		System.out.println("hello"+name);
		
	}
	public void init(){
		System.out.println("对象被创建了");
	}
	public void destroy(){
		System.out.println("对象被销毁了");
	}
}

Demo

public class Demo {
	@Test
	public void run(){
		//创建工厂，加载核心配置文件
		ClassPathXmlApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");
		//从工厂中获取对象
		UserService usi=(UserServiceImpl)ac.getBean("userService");
		//调用方法执行
		usi.sayHello();
		//关闭工厂
		ac.close();
	}
}

可以在web.xml中配置spring监听器，只加载一次配置文件

		 <listener>
            <listener-class>org.springframework.web.context.contextloaderlistener</listener-class>
         </listener>
         <context-param>
            <param-name>contextconfiglocation</param-name>
            <param-value>classpath:applicationcontext.xml</param-value>
         </context-param>

//加完监听器后Web的工厂方式
		ServletContext servletContext=ServletActionContext.getServletContext();
		WebApplicationContext context=WebApplicationContextUtils.getWebApplicationContext(servletContext);
		context.getBean("service");