Spring的IOC的xml和注解

XML：可以使用任何场景

优点：结构清晰，维护方便

注解：有些地方用不了，这个类不是自己提供的

优点：开发方便

ProductDao.java

package com.cherry.spring.demo3;

public class ProductDao {

  public void save() {
    System.out.println("ProductDao的save方法执行..");
  }
}

OrderDao.java

package com.cherry.spring.demo3;

public class OrderDao {

  public void save() {
    System.out.println("OrderDao的save方法执行..");
  }
}

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"
    xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- Spring的IOC的注解的入门 -->
    <!-- 使用IOC的注解开发，配置扫描(哪些包下的类使用IOC的注解) -->
    <!-- 扫描时为了扫描类上的注解 -->
    <!-- <context:component-scan base-package="com.cherry.spring"/> -->
    
    <!-- 在没有扫描的情况下使用属性注入的注解：@Resource @Value @Autowired @Qulifier -->
    <context:annotation-config/>
    
    <bean name="productService" class="com.cherry.spring.demo3.ProductService"></bean>
    
    <bean name="productDao" class="com.cherry.spring.demo3.ProductDao"/>
    <bean name="orderDao" class="com.cherry.spring.demo3.OrderDao"/>
    
</beans>

ProductService.java

package com.cherry.spring.demo3;

import javax.annotation.Resource;

public class ProductService {
  
  @Resource(name="productDao")
  private ProductDao productDao;
  @Resource(name="orderDao")
  private OrderDao orderDao;
  
  
  
  public void setProductDao(ProductDao productDao) {
    this.productDao = productDao;
  }



  public void setOrderDao(OrderDao orderDao) {
    this.orderDao = orderDao;
  }



  public void save() {
    System.out.println("ProductService的save方法执行了..");
    productDao.save();
    orderDao.save();
  }
}

测试类

package com.cherry.spring.demo3;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class SpringDemo3 {
  
  @Test
  public void demo1() {
    ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
    ProductService productService = (ProductService) applicationContext.getBean("productService");
    productService.save();
  }
}