spring学习笔记五

一、Bean设置基础类型

1.1、BookDao接口和实现类

public interface BookDao {
    void save();
}

public class BookDaoImpl implements BookDao {

    private int connectionNum;
    private String databaseName;

    public void setConnectionNum(int connectionNum) {
        this.connectionNum = connectionNum;
    }

    public void setDatabaseName(String databaseName) {
        this.databaseName = databaseName;
    }



    public void save(){
        System.out.println("book dao save......" + databaseName+","+ connectionNum);
    }
}

1.2、配置文件

<?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="com.itheima.dao.impl.BookDaoImpl" scope="prototype">
<!--        基本类型-->
        <property name="databaseName" value="mysql"/>
        <property name="connectionNum" value="10"/>
    </bean>
</beans>

1.3、总结

• bean中基本数据类型是设置property中value属性

二、 Bean设置引用类型

2.1、BookService接口和实现类

public interface BookService {
    void save();
}
public class BookServiceImpl implements BookService, InitializingBean, DisposableBean {
    private BookDao bookDao;
    private UserDao userDao;

    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }



    public void save(){
//        System.out.println("book service save..");
        bookDao.save();
        userDao.save();
    }

    // 提供对应的set方法
    public void setBookDao(BookDao bookDao) {
        this.bookDao = bookDao;
    }

    public void destroy() throws Exception {
        System.out.println("service destroy");
    }

    public void afterPropertiesSet() throws Exception {
        System.out.println("service init");
    }
}

2.2、配置文件

<?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="com.itheima.dao.impl.BookDaoImpl" scope="prototype">
        <!-- 基本类型使用value-->
        <property name="databaseName" value="mysql"/>
        <property name="connectionNum" value="10"/>
    </bean>
    <bean id="userDao" class="com.itheima.dao.impl.UserDaoImpl" scope="singleton"/>
    <bean id="bookService" name="service" class="com.itheima.service.impl.BookServiceImpl">
        <!-- 引用类型使用ref -->
        <property name="bookDao" ref="bookDao"></property>
        <property name="userDao" ref="userDao" />
    </bean>
</beans>

2.3、总结

• 基本数据类型使用的是value
• 引用类型使用的是ref