J2EE之Spring中Bean的基础配置

J2EE之Spring中Bean的基础配置

package com.mooc.spring.beans;

public class Car {

private String brand;
private String corp;
private double price;
private int maxSpeed;
public Car(String brand, String corp, double price) {
super();
this.brand = brand;
this.corp = corp;
this.price = price;
}

public Car(String brand, String corp, int maxSpeed) {
super();
this.brand = brand;
this.corp = corp;
this.maxSpeed = maxSpeed;
}

@Override
public String toString() {
return "Car [brand=" + brand + ", corp=" + corp + ", price=" + price + ", maxSpeed=" + maxSpeed + "]";
}

}

package com.mooc.spring.beans;

public class HelloWord {
private String name;

public void setName(String name) {
System.out.println("setname:"+name);
this.name = name;
}
public void hello(){
System.out.println("hello"+name);
}

public HelloWord(){
System.out.println("HelloWord's Constractor....");
}

}

package com.mooc.spring.beans;

import java.io.IOException;
import java.lang.annotation.Annotation;
import java.util.Locale;
import java.util.Map;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.beans.factory.config.AutowireCapableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.MessageSourceResolvable;
import org.springframework.context.NoSuchMessageException;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.core.env.Environment;
import org.springframework.core.io.Resource;

public class main {

public static void main(String[] args) {
/*
//创建HelloWord的一个对象

HelloWord helloWord=new HelloWord();
//为那么赋值
helloWord.setName("atguigu");
helloWord.hello();

*/

//1.创建SpringIOC的容器对象

//ApplicationContext 代表IOC容器
//ClassPathXmlApplicationContext：从 类路径下加载配置文件,是ApplicationContext接口的实现类
//FileSystemXmlApplicationContext: 从文件系统中加载配置文件,是ApplicationContext接口的实现类
ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");

//      2.从IOC容器中获取Bean对象
//      HelloWord helloWord=(HelloWord) context.getBean("helloWord");
HelloWord helloWord=context.getBean(HelloWord.class);//适用类型获取，只适用于唯一的一哥bean
System.out.println(helloWord);

//调用hello方法
helloWord.hello();

Car car=(Car) context.getBean("car");
System.out.println(car);

car =(Car) context.getBean("car2");
System.out.println(car);

}

}

<?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"> 
<!-- 配置bean
class:bean的全类名，通过反射的方式在IOC容器中创建Bean，所以要求Bean中必须有无参数的构造器
id:标示容器中的bean，id必须唯一  HelloWord helloWord=(HelloWord) context.getBean("helloWord");
-->
<bean id="helloWord" class="com.mooc.spring.beans.HelloWord">
<property name="name" value="Spring"></property>
</bean>

<!-- 通过构造方法来配置Bean的属性  ,用index确定顺序，以type确定类型，以区分重载构造器-->
<bean id="car" class="com.mooc.spring.beans.Car">
<constructor-arg value="Audi" index="0"></constructor-arg>
<constructor-arg value="shanghai" index="1"></constructor-arg>
<constructor-arg value="300000" type="double"> </constructor-arg>
</bean>

<bean id="car2" class="com.mooc.spring.beans.Car">
<constructor-arg value="Baoma" type="java.lang.String"></constructor-arg>
<constructor-arg value="shanghai" type="java.lang.String"></constructor-arg>
<constructor-arg value="240" type="int"> </constructor-arg>
</bean>
</beans>