SSM、工厂模式和spring的IoC操作

SSM框架集:

SSM https://baike.baidu.com/item/SSM/18801167?fr=aladdin

工厂模式和spring的IoC操作：

运行结果：

代码整体结构布局：

代码如下：

Pet:

package com.aaa.entity;

public abstract class Pet {
    protected String name;
    protected String color;
    protected int health;

    public Pet(String name,String color,int health){
        this.name=name;
        this.color=color;
        this.health=health;
    }

    public abstract void  eat();

}

Cat:

package com.aaa.entity;

public class Cat extends Pet{

    public Cat(){
        super("aaa","bbb",100);
    }
    public Cat(String name, String color,int health) {
        super(name, color,health);
    }

    @Override
    public void eat() {
        System.out.println(this.color+"的"+this.name+"吃小鱼");
    }
}

Dog:

package com.aaa.entity;

public class Dog extends Pet{
    public Dog(String name, String color,int health) {
        super(name, color,health);
    }

    @Override
    public void eat() {
        System.out.println(this.color+"的"+this.name+"吃骨头");
    }
}

Student:

package com.aaa.entity;

public class Student {

    public Student(){
        System.out.println("调用了student的构造方法。。。");
    }

    public void introduce(){
        System.out.println("我是一个学生....");
    }
}

PetFactory:

package com.aaa.fatory;

import com.aaa.entity.Cat;
import com.aaa.entity.Dog;
import com.aaa.entity.Pet;

public class PetFactory {
    //创建宠物对象实例
    public static Pet createInstance(String petType,String petName,String petColor){
        Pet pet = null;

        switch (petType){
            case "cat":
                pet = new Cat(petName,petColor,100);
                break;
            case "dog":
                pet = new Dog(petName,petColor,100);
                break;
        }
        return pet;
    }
}

(test)Test:

(Test2\Test3\Test4代码与Test相同，省略)

package com.aaa.test;

import com.aaa.entity.Cat;
import com.aaa.entity.Dog;
import com.aaa.entity.Pet;
import com.aaa.fatory.PetFactory;

import java.util.Scanner;

public class Test {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入宠物类型:");
        String petType= scanner.next();
        System.out.println("请输入宠物的名字:");
        String petName = scanner.next();
        System.out.println("请输入宠物的颜色:");
        String petColor = scanner.next();

        Pet pet = PetFactory.createInstance(petType,petName,petColor);

        if(pet!=null){
            pet.eat();
        }else{
            System.out.println("没有这个宠物，无法创建");
        }
        //控制反转IoC
        //没有用spring的时候，对象的创建程序员自己写。
        //用了spring之后，对象的创建交给spring来做。这就是spring IoC

    }
}

(test2)Test:

package com.aaa.test2;

import com.aaa.entity.Cat;
import com.aaa.entity.Student;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test {
    public static void main(String[] args) {
        //Student student = new Student();
        //student.introduce();

        //构建spring容器对象，然后从容器中获取我们需要的对象(必须提前在xml中定义)
        ApplicationContext ac  = new ClassPathXmlApplicationContext("spring-1.xml");
        Student student = ac.getBean(Student.class);
        student.introduce();

        Cat cat = ac.getBean(Cat.class);
        cat.eat();
    }
}

spring-1.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">
    <!--通过bean标签定义要创建的对象-->
    <bean class="com.aaa.entity.Student"/>
    <bean class="com.aaa.entity.Cat"/>

</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>org.example</groupId>
    <artifactId>lesson0819_myspring</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>
        <!--引入spirng模块-->
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.3.18</version>
        </dependency>
    </dependencies>

</project>

// A code block
var foo = 'bar';