Spring最基础使用1

1. 导入Spring等jar包

2. 配置文件 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">

    <!--  <context:component-scan base-package="com.chinasofti.bean"></context:component-scan>  -->  

    <!-- 构造器方式 -->
    <bean id="dog" class="day1.Dog">
        <!-- 有参的类： constructor-arg 标签代表有参构造，index对应第几个参数，value是值 -->
        <constructor-arg index="0" value="杀魔爷"></constructor-arg>
        <constructor-arg index="1" value="888"></constructor-arg>

    </bean>

    <!-- 静态工厂方式  -->
    <bean id="product" class="beans.staticFactorys" factory-method="getProduct"></bean>

    <!-- 非公共类 -->
    <bean id="div" class="beans.Div"></bean>

    <!-- 普通类的方法 返回的对象 -->
    <bean id="factory" class="beans.Factory" ></bean>
    <bean id="product2" factory-bean="factory" factory-method="getProduct"></bean>
</beans>

3. 对应的bean  如

package day1;

public class Dog {
    private String name;
    int age;

    public Dog(){ //无参构造
        System.out.println("初始化，我是无参构造");
    }

    public Dog(String name){
        this.name=name;
        System.out.println("初始化1");
    }

    public Dog(String name,int age){
        this.name=name;
        this.age=age;

        System.out.println("初始化Dog,name:"+name);
    }

    public void shout(){ // 方法
        System.out.println("时间，不在于你拥有多少，而在于你使用多少");
    }

    public String getName() {
        return name;
    }

    public void setName(String s) {
        this.name =s;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Dog [name=" + name + ", age=" + age + "]";
    }

    public void destory(){
        System.out.println("狗不在了");
    }

}

4. 获取bean

package day1;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class DogTest {
    public static void main(String[] args) {

        String path="applicationContext.xml";
        ApplicationContext ac=new ClassPathXmlApplicationContext(path);//实例化容器
        Dog dog=(Dog) ac.getBean("dog");// 向容器ac 索取id名为 dog的bean 对象
            // 容器查找bean 配置里的id 为dog 的bean 标签， 然后根据bean 标签里的class路径对应的类  来实例化对应的对象
        //dog.shout();
        System.out.println(dog.getName());
        System.out.println(dog.getAge());

    }
}