SpringIOC创建对象第一练

忘是亡心i 2022-03-19 02:08 190阅读 0赞

①创建IOC容器对象

package com.ioc.bean;
    
    public class Book {
    	
    	private Integer BookId;
    	private String BookName;
    	private String author;
    	private double price;
    	
    	
    	
    	public Book() {System.out.println("构造器已经创建");}
    	
    	
    	
    	public Book(Integer bookId, String bookName, String author, double price) {
    		super();
    		BookId = bookId;
    		BookName = bookName;
    		this.author = author;
    		this.price = price;
    	}
    
    
    
    	public Integer getBookId() {
    		return BookId;
    	}
    	public void setBookId(Integer bookId) {
    		BookId = bookId;
    	}
    	public String getBookName() {
    		return BookName;
    	}
    	public void setBookName(String bookName) {
    		BookName = bookName;
    	}
    	public String getAuthor() {
    		return author;
    	}
    	public void setAuthor(String author) {
    		this.author = author;
    	}
    	public double getPrice() {
    		return price;
    	}
    	public void setPrice(double price) {
    		this.price = price;
    	}
    	
    	@Override
    	public String toString() {
    		return "Book [BookId=" + BookId + ", BookName=" + BookName + ", author=" + author + ", price=" + price + "]";
    	}
    	
    
    }

ApplicationContext接口

package com.ioc.test;
    
    import org.junit.Test;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
     public class IOCTest {
    
    	@Test
    	  public  void test() {
    		ApplicationContext myIoc = new ClassPathXmlApplicationContext("j.xml");
    		
    		System.out.println("ioc已经创建");
    		
    		Object bean = myIoc.getBean("book01");
    		
    		System.out.println(bean);
    	}
    
    }

②调用IOC容器对象的getBean()方法即可获取IOC容器中配置的bean对应的对象

\[1\]getBean(String id) 根据配置文件中指定的bean的id获取

\[2\]getBean(Class<?> clazz) 根据bean的类型

根据类型获取bean的前提条件是IOC容器中指定类型的bean只有一个

<?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="book01" class="com.ioc.bean.Book">
    		<property name="bookId" value="1"></property>
    		<property name="bookName" value="bookName01"></property>
    		<property name="author" value="author01"></property>
    		<property name="price" value="100"/>
    	</bean>
    	
    
    </beans>