Bean的注入方式

        set注入

基本数据类型注入

集合注入

对象注入

构造注入

基本数据类型注入

自动装配

<?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:aop="http://www.springframework.org/schema/aop"
	xmlns:context="http://www.springframework.org/schema/context"
	default-autowire="byType"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

	<bean id="userBiz1" class="com.javaxl.ioc.biz.impl.UserBizImpl1"></bean>
	<bean id="userBiz2" class="com.javaxl.ioc.biz.impl.UserBizImpl2"></bean>
	<!-- IOC注入 -->
	<bean id="userAction" class="com.javaxl.ioc.web.UserAction">
		<!-- <property name="sid" value="22"></property> -->
		<!-- <property name="sname" value="zs"></property> -->
		<constructor-arg name="sid" value="22"></constructor-arg>
		<constructor-arg name="sname" value="zs"></constructor-arg>
		<property name="hobby">
			<list>
				<value>篮球</value>
				<value>足球</value>
				<value>读书</value>
			</list>
		</property>
		<!-- 项目中的Bean交给spring进行管理，由原来的程序员维护，变成spring维护，方便项目的后期维护，这就是控制反转 -->
<!-- 		<property name="userBiz" ref="userBiz2"></property> -->
	</bean>
</beans>

package com.javaxl.ioc.util;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

@WebListener
public class SpringLoadListener implements ServletContextListener {
	private String springXmlLocation = "";

	@Override
	public void contextInitialized(ServletContextEvent sce) {
		ServletContext servletContext = sce.getServletContext();
		springXmlLocation = servletContext.getInitParameter("springXmlLocation");
		if(null == springXmlLocation || "".equals(springXmlLocation)) {
			springXmlLocation = "/spring-context.xml";
		}
		System.out.println("spring的主配置文件是："+springXmlLocation);
		ApplicationContext springContext = new ClassPathXmlApplicationContext(springXmlLocation);
		servletContext.setAttribute("SPRING_CONTEXT_KEY", springContext);
	}
}

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
  <display-name>Archetype Created Web Application</display-name>
  <context-param>
  	<param-name>springXmlLocation</param-name>
  	<param-value>/spring-other.xml</param-value>
  </context-param>
</web-app>

package com.javaxl.ioc.test;

import java.io.IOException;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.context.ApplicationContext;

import com.javaxl.ioc.web.UserAction;
/**
 * 测试一下spring的上下文是否交给了tomcat容器进行管理
 * @author Administrator
 *
 */
@WebServlet("/iocServlet")
public class IocServlet extends HttpServlet {

	private static final long serialVersionUID = -3937540355899886901L;
	
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		doPost(req, resp);
	}
	
	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		ServletContext servletContext = req.getServletContext();
		ApplicationContext springContext = (ApplicationContext) servletContext.getAttribute("SPRING_CONTEXT_KEY");
		UserAction bean = (UserAction) springContext.getBean("userAction");
		bean.test3();
	}

}