给级联属性进行赋值

1.创建一个项目,导入jar包(ioc)

2.拷贝applicationContext.xml到src下

3.创建一个bean包,类分别是Book和CartItem,分别提供get,set方法,toStrong和有参,无参

4.在applicationContext.xml进行配置bean,然后进行级联属性赋值

5.进行测试

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bean

package com.xcz.bean;

public class Book {
    private int id;
    private String name;
    private int price;
    public Book() {
        super();
    }
    public Book(int id, String name, int price) {
        super();
        this.id = id;
        this.name = name;
        this.price = price;
    }
    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 int getPrice() {
        return price;
    }
    public void setPrice(int price) {
        this.price = price;
    }
    @Override
    public String toString() {
        return "Book [id=" + id + ", name=" + name + ", price=" + price + "]\n";
    }
    
}

package com.xcz.bean;

public class CartItem {
    private Book book;
    private String count;
    private double amount;
    
    public CartItem() {
        super();
    }
    public CartItem(Book book, String count, double amount) {
        super();
        this.book = book;
        this.count = count;
        this.amount = amount;
    }
    public Book getBook() {
        return book;
    }
    public void setBook(Book book) {
        this.book = book;
    }
    public String getCount() {
        return count;
    }
    public void setCount(String count) {
        this.count = count;
    }
    public double getAmount() {
        return amount;
    }
    public void setAmount(double amount) {
        this.amount = amount;
    }
    @Override
    public String toString() {
        return "CartItem [book=" + book + ", count=" + count + ", amount=" + amount + "]\n";
    }
    
}

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" 
    xmlns:jdbc="http://www.springframework.org/schema/jdbc"  
    xmlns:jee="http://www.springframework.org/schema/jee" 
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd
        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.1.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.1.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd
        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.1.xsd">
    <!-- 配置bean -->    
    <bean id="book" class="com.xcz.bean.Book">
        <property name="id" value="1"></property>
        <property name="name" value="红楼梦"></property>
        <property name="price" value="300"></property>
    </bean>
    <!-- 给级联属性赋值 -->
    <bean id="carItem" class="com.xcz.bean.CartItem">
        <property name="book" ref="book"></property>
        <!-- 赋值 -->
        <property name="book.id" value="2"></property>
        <property name="book.name" value="Oracle"></property>
        <property name="count" value="30"></property>
        <property name="amount" value="10.2"></property>
    </bean>
</beans>

test

package com.xcz.bean.test;


import org.junit.jupiter.api.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.xcz.bean.CartItem;

class CarItemTest {
    //创建IOC容器
    ApplicationContext ioc = new ClassPathXmlApplicationContext("applicationContext.xml");
    @Test
    void test1() {
        CartItem cItem = (CartItem) ioc.getBean("carItem");
        System.out.println(cItem);
    }
}