Spring-IOC/DI

Spring是一个基于IOC/DI结构的J2EE框架
IOC是控制反转，Spring容器帮我们自动创建对象
DI是依赖注入，Spring帮我们，将前端传来的值自动加载进Bean中对应字段中

代码

1、导入jar包
链接：https://pan.baidu.com/s/1wtBmbkGKWRNZb6bTyxK5Eg 
提取码：op0j
2、写model
Category

package com.llhc.pojo;
public class Category {
    private int id;
    private String name;
    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;
    }
}

Product

package com.llhc.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;
    }
}

3、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: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.llhc.pojo.Category">
        <property name="name" value="cateogry 1"></property>
    </bean>
    <bean name="p" class="com.llhc.pojo.Product">
        <property name="name" value="product 1"/>
        <property name="category" ref="c"/>
    </bean>
  </beans>

4、测试

package com.llhc.controller;

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

import com.llhc.pojo.Category;
import com.llhc.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());
    }
}