Spring初学日记（二）

谁借莪１个温暖的怀抱￠ 2022-05-19 03:13 197阅读 0赞

Category类：

package com.how2java.pojo;
    
    import org.springframework.stereotype.Component;
    
    public class Category {
     
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
    
        private String name="category 1";
    }

在Category类的基础上，再声明一个类Product.java

package com.how2java.pojo;
    
    public class Product {
    
    	private int id;
    	private String name;
    	private Category category;
    
    	public int getId() {return id;}
    	public void setId(int id) {this.id = id;}
    	public String getName() {return name;}
    	public void setName(String name) {this.name = name;}
    	public Category getCategory() {return category;}
    	public void setCategory(Category category) {this.category = category;}
    }

在applicationContext.xml中加入ref来注入另外一个对象：

<?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:aop="http://www.springframework.org/schema/aop"
    	xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
    	xsi:schemaLocation="
       http://www.springframework.org/schema/beans 
       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/aop 
       http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
       http://www.springframework.org/schema/tx 
       http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
       http://www.springframework.org/schema/context      
       http://www.springframework.org/schema/context/spring-context-3.0.xsd">
    
    	<bean name="c" class="com.how2java.pojo.Category">
    		<property name="name" value="category 1" />
    	</bean>
    	<bean name="p" class="com.how2java.pojo.Product">
    		<property name="name" value="product1" />
    		<property name="category" ref="c" />
    	</bean>
    
    </beans>

可以通过product来调用category的方法：

package com.how2java.test;
     
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
     
    import com.how2java.pojo.Product;
     
    public class TestSpring {
     
        public static void main(String[] args) {
            ApplicationContext context = new ClassPathXmlApplicationContext(new String[] { "applicationContext.xml" });
            Product p = (Product) context.getBean("p");
            System.out.println(p.getName());
            System.out.println(p.getCategory().getName());
        }
    }

可得运行结果：

product 1
    category 1

项目代码与jar包资源：

[https://download.csdn.net/download/lee18254290736/10552641][https_download.csdn.net_download_lee18254290736_10552641]

[https_download.csdn.net_download_lee18254290736_10552641]: https://download.csdn.net/download/lee18254290736/10552641