Spring-ioc第一个项目（itheima）

项目结构：

applicationContext.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/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>spring-ioc</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>
    </dependencies>

</project>

UserDao.java

package com.itheima.dao;

public interface UserDao {
  public void save();
}

UserDaoImpl

package com.itheima.dao.impl;

import com.itheima.dao.UserDao;

public class UserDaoImpl implements UserDao {
  public void save(){
    System.out.println("-----save-----");
  }
}

UserDaoDemo

package com.itheima.demo;

import com.itheima.dao.UserDao;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class UserDaoDemo {
  public static void main(String[] args) {
    ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
    UserDao userDao = (UserDao) applicationContext.getBean("userDao");
    userDao.save();

  }
}