跟着黑马,简单写一个小的测试程序,学习一下IoC
第一步,导入Spring的坐标Spring-context,对应的版本是2.1.10.RELEASE
黑马刚开篇讲的是,springframework,需要用到这个maven依赖
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.2.10.RELEASE</version>
</dependency>
Ps.别忘了加一下junit测试依赖
第二步,配置所需的bean
解释一下各类的标签作用吧
bean标签表示配置bean
id属性表示给bean起名字
class属性表示给bean定义类型
第三步,获取IoC容器
第四步,获取bean
运行测试结果
我是根据黑马这期课程学的,有兴趣的朋友可以自己尝试一下
https://www.bilibili.com/video/BV1Fi4y1S7ix?p=6&vd_source=05d486328adc7a106efad2adad535e45
附上目录和代码吧
applicationContext.xml
<?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">
<!--1.导入Spring的坐标Spring-context,对应的版本是2.1.10.RELEASE-->
<!--2.配置bean-->
<!-- bean标签表示配置bean-->
<!-- id属性表示给bean起名字-->
<!-- class属性表示给bean定义类型-->
<bean id="bookDao" class="org.example.dao.impl.BookDaoImpl"></bean>
<bean id="bookService" class="org.example.service.impl.BookServiceImpl"></bean>
</beans>
App2.java
package org.example;
import org.example.dao.BookDao;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class App2 {
public static void main(String[] args) {
//3.获取IoC容器
ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
//4.获取bean
BookDao bookDao = (BookDao) ctx.getBean("bookDao");
bookDao.save();
}
}
BookDaoImpl
package org.example.dao.impl;
import org.example.dao.BookDao;
public class BookDaoImpl implements BookDao {
public void save() {
System.out.println("book dao save ...");
}
}
BookDao
package org.example.dao;
public interface BookDao {
public void save();
}
BookServiceImpl
package org.example.service.impl;
import org.example.dao.BookDao;
import org.example.dao.impl.BookDaoImpl;
import org.example.service.BookService;
public class BookServiceImpl implements BookService {
//5.删除业务层中使用new的方式创建的dao对象
private BookDao bookDao = new BookDaoImpl();
public void save() {
System.out.println("book service save ...");
bookDao.save();
}
//6.提供对应的set方法
public void setBookDao(BookDao bookDao) {
this.bookDao = bookDao;
}
}
BookService
package org.example.service;
public interface BookService {
public void save();
}
标签:入门,dao,BookDao,example,案例,org,save,IoC,public
From: https://www.cnblogs.com/yzx-sir/p/17379344.html