标签:package instance res 现在 encoding pac ext nap odi
创建一个工程名为 hello-spring
的项目,pom.xml
文件如下:
1 <?xml version="1.0" encoding="UTF-8"?> 2 <project xmlns="http://maven.apache.org/POM/4.0.0" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 5 <modelVersion>4.0.0</modelVersion> 6 7 <groupId>com.snake</groupId> 8 <artifactId>hello-spring</artifactId> 9 <version>1.0.0-SNAPSHOT</version> 10 <packaging>jar</packaging> 11 12 <dependencies> 13 <dependency> 14 <groupId>org.springframework</groupId> 15 <artifactId>spring-context</artifactId> 16 <version>4.3.17.RELEASE</version> 17 </dependency> 18 </dependencies> 19 </project>
UserService
接口1 package com.snake.hello.spring.service; 2 3 public interface UserService { 4 public void sayHi(); 5 }
UserServiceImpl
实现package com.snake.hello.spring.service.impl; import com.snake.hello.spring.service.UserService; public class UserServiceImpl implements UserService { public void sayHi() { System.out.println("Hello Spring"); } }
在 src/main/resources
目录下创建 spring-context.xml
配置文件,从现在开始类的实例化工作交给 Spring 容器管理(IoC),配置文件如下:
<?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"> <bean id="userService" class="com.funtl.hello.spring.service.impl.UserServiceImpl" /> </beans>
<bean />
:用于定义一个实例对象。一个实例对应一个 bean 元素。
id
:该属性是 Bean 实例的唯一标识,程序通过 id 属性访问 Bean,Bean 与 Bean 间的依赖关系也是通过 id 属性关联的。
class
:指定该 Bean 所属的类,注意这里只能是类,不能是接口。
创建一个 MyTest
测试类,测试对象是否能够通过 Spring 来创建,代码如下:
package com.snake.hello.spring; import com.snaek.hello.spring.service.UserService; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class MyTest { public static void main(String[] args) { // 获取 Spring 容器 ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring-context.xml"); // 从 Spring 容器中获取对象 UserService userService = (UserService) applicationContext.getBean("userService"); userService.sayHi(); } }
标签:package instance res 现在 encoding pac ext nap odi
原文地址:https://www.cnblogs.com/snake107/p/11914969.html