一、注入引用类型
Service 层
通过构造器注入，添加构造器，并传入 BookDao
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| public class BookServiceImpl implements BookService, InitializingBean, DisposableBean {
private BookDao bookDao;
public BookServiceImpl(BookDao bookDao) {
this.bookDao = bookDao;
}
public void save() {
System.out.println("book service save ...");
bookDao.save();
}
}
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配置
- 在 bookService 的 bean 中添加
contructor-arg 标签
- name 代表要注入的属性：构造器中形参的名称
- value 代表要注入的值：注入的引用 bean Id
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| <?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="bookDao" class="cn.pangcy.dao.impl.BookDaoImpl" />
<bean id="bookService" class="cn.pangcy.service.impl.BookServiceImpl">
<constructor-arg name="bookDao" ref="bookDao" />
</bean>
</beans>
|
二、注入简单类型
Dao 层
创建构造器，并传入属性：type, price
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| public class BookDaoImpl implements BookDao {
private String type;
private int price;
public BookDaoImpl(String type, int price) {
this.type = type;
this.price = price;
}
@Override
public void save() {
System.out.println("book dao save !!! " + type +": " + price);
}
}
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配置
- 在 bookDao 的 bean 中添加
contructor-arg 标签
- name 代表要注入的属性：构造器中形参的名称
- value 代表要注入的值：常量值
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| <?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="bookDao" class="cn.pangcy.dao.impl.BookDaoImpl">
<constructor-arg name="price" value="1020" />
<constructor-arg name="type" value="系统集成" />
</bean>
<bean id="bookService" class="cn.pangcy.service.impl.BookServiceImpl">
<constructor-arg name="bookDao" ref="bookDao" />
</bean>
</beans>
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