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1.3 Spring的入门程序

news 2025/11/12 5:38:42

我用 idea

package com.itheima.ioc;public interface UserDao {public void say();
}

package com.itheima.ioc;public class UserDaoImpl implements UserDao {public void say() {System.out.println("userDao say hello World ! ");}
}

<?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/beanshttp://www.springframework.org/schema/beans/spring-beans-4.3.xsd"><bean id="userDao" class="com.itheima.ioc.UserDaoImpl" />
</beans>

package com.itheima.ioc;import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;public class TestloC {public static void main(String[] args){//1．初始化spring容器，加载配置文件ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");//2．通过容器获取userDao实例UserDao userDao = (UserDao)applicationContext.getBean("userDao");//调用实例中的say()方法userDao.say();}
}

这里会报错，因为 springframework 没有安装 spring 依赖。

这里改成 maven 项目

在chapter01下创建 pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.itheima</groupId><artifactId>chapter01</artifactId><version>1.0-SNAPSHOT</version><dependencies><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>4.3.6.RELEASE</version></dependency></dependencies>
</project>

重启启动项目，会有个提示框提示检测到 maven，点确认会导入 maven，就不会报错了