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");