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四秒网站建设,28商机网,做外贸单网上都做的那些网站,莱芜信息平台愤怒的Spring（三） 一、目录结构环境搭配与上一篇内容一样，详情请看愤怒的Spring（二）Idaea Maven搭建Spring并运行项目（超详细，超全）https://blog.csdn.net/sz710211849/article/d…

愤怒的Spring（三）

一、目录结构

环境搭配与上一篇内容一样，详情请看愤怒的Spring（二）Idaea Maven搭建Spring并运行项目（超详细，超全）https://blog.csdn.net/sz710211849/article/details/129715765
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二、代码与结果展示

BookDao

package com.cc;public interface BookDao {public void save();
}

BookDaoImpl

package com.cc;public class BookDaoImpl implements BookDao {public BookDaoImpl() {System.out.println("book dao constructor is running ....");}public void save() {System.out.println("book dao save ...");}}

OrderDao

package com.cc;public interface OrderDao {public void save();
}

OrderDaoImpl

package com.cc;public class OrderDaoImpl implements OrderDao {public void save() {System.out.println("order dao save ...");}
}

UserDao

package com.cc;public interface UserDao {public void save();
}

UserDaoImpl

package com.cc;public class UserDaoImpl implements UserDao {public void save() {System.out.println("user dao save ...");}
}

OrderDaoFactory

package com.cc;//静态工厂创建对象
public class OrderDaoFactory {public static OrderDao getOrderDao(){System.out.println("factory setup....");return new OrderDaoImpl();}
}

UserDaoFactory

package com.cc;//实例工厂创建对象
public class UserDaoFactory {public UserDao getUserDao(){return new UserDaoImpl();}
}

UserDaoFactoryBean

package com.cc;import org.springframework.beans.factory.FactoryBean;
//FactoryBean创建对象
public class UserDaoFactoryBean implements FactoryBean<UserDao> {//代替原始实例工厂中创建对象的方法public UserDao getObject() throws Exception {return new UserDaoImpl();}public Class<?> getObjectType() {return UserDao.class;}}

AppForInstanceBook

package com.cc;import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;public class AppForInstanceBook {public static void main(String[] args) {ApplicationContext ctx = new ClassPathXmlApplicationContext("spring.xml");BookDao bookDao = (BookDao) ctx.getBean("bookDao");bookDao.save();}
}

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每运行一个APP内容，其余的bean需要注释掉，只留下本APP需要的bean

AppForInstanceOrder

package com.cc;import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;public class AppForInstanceOrder {public static void main(String[] args) {//通过静态工厂创建对象
//        OrderDao orderDao = OrderDaoFactory.getOrderDao();
//        orderDao.save();ApplicationContext ctx = new ClassPathXmlApplicationContext("spring.xml");OrderDao orderDao = (OrderDao) ctx.getBean("orderDao");orderDao.save();}
}

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AppForInstanceUser

package com.cc;import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;public class AppForInstanceUser {public static void main(String[] args) {
//        //创建实例工厂对象
//        UserDaoFactory userDaoFactory = new UserDaoFactory();
//        //通过实例工厂对象创建对象
//        UserDao userDao = userDaoFactory.getUserDao();
//        userDao.save();ApplicationContext ctx = new ClassPathXmlApplicationContext("spring.xml");UserDao userDao1 = (UserDao) ctx.getBean("userDao");UserDao userDao2 = (UserDao) ctx.getBean("userDao");System.out.println(userDao1);System.out.println(userDao2);
//        userDao.save();}
}

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spring.xml

每运行一个APP内容，其余的bean需要注释掉，只留下本APP需要的bean

<?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"><!--方式一：构造方法实例化bean--><!--    <bean id="bookDao" class="com.cc.BookDaoImpl"/>--><!--方式二：使用静态工厂实例化bean--><!--    <bean id="orderDao" class="com.cc.OrderDaoFactory" factory-method="getOrderDao"/>--><!--方式三：使用实例工厂实例化bean--><!--    <bean id="userFactory" class="com.cc.UserDaoFactory"/><bean id="userDao" factory-method="getUserDao" factory-bean="userFactory"/>--><!--方式四：使用FactoryBean实例化bean--><bean id="userDao" class="com.cc.UserDaoFactoryBean"/></beans>

pom.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>com.itheima</groupId><artifactId>spring_01_quickstart</artifactId><version>1.0-SNAPSHOT</version><dependencies><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>6.0.6</version></dependency></dependencies><build><defaultGoal>compile</defaultGoal></build></project>

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