Spring IOC快速入门

Spring IOC底层实现原理

Spring官方下载地址：

https://repo.spring.io/libs-release-local/org/springframework/spring/

目录结构：

docs:api文档和开发规范 libs：开发需要的jar包和源码 schema：开发需要的schema文件

新建项目：

项目结构：

没有resources解决方法：

ok

项目测试：

在pom.xml中导入依赖文件

copy代码：

<dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>4.2.4.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.2.4.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>4.2.4.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-expression</artifactId> <version>4.2.4.RELEASE</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> <dependency> <groupId>org.junit.jupiter</groupId> <artifactId>junit-jupiter</artifactId> <version>RELEASE</version> <scope>compile</scope> </dependency> </dependencies>

新建Java文件

Java文件变成源代码文件

右键java文件

测试传统开发方式和Spring反转控制和依赖注入

在resources下新建xml配置文件

copy代码：

<?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"> <!--UserService的创建权交给了Spring--> <bean id="userService" class="com.imooc.ioc.demo1.UserServiceImpl"> <!--设置属性--> <property name="name" value="食品名称"/> <property name="taste" value="食品口味"/> <property name="kind" value="食品种类"/> </bean> </beans>

1.新建包

2.新建接口UserService

public interface UserService { public void sayHello(); }

3.新建类UserServiceImpl

public class UserServiceImpl implements UserService { private String name; private String taste; private String kind; public void sayHello(){ System.out.println("hello spring"); System.out.println(name+kind+taste); } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getTaste() { return taste; } public void setTaste(String taste) { this.taste = taste; } public String getKind() { return kind; } public void setKind(String kind) { this.kind = kind; } }

4.新建测试类SpringDemo1

public class SpringDemo1 { @Test /** *传统方式开发 */ public void demo1(){ //UserService userService = new UserServiceImpl(); UserServiceImpl userService = new UserServiceImpl(); //设置属性 userService.setName("张三"); userService.sayHello(); } @Test /** *Spring方式实现 */ public void demo2(){ //创建Spring的工厂 ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml"); //通过工厂获得类 UserService userService =(UserService) applicationContext.getBean("userService"); userService.sayHello(); } }