Spring注入屬性、對象

對Category和Product注入屬性，並且對Product對象，注入一個Category對象

一、新建項目

二、導包

三、新建Category類

package com.yyt.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;
    }
  }

四、新建Product類，將添加一個Category類型屬性

package com.yyt.pojo;

public class Product {
     private int id;
       private String name;
       private float price;
       private Category category;

五、在src目錄下新建applicationContext.xml文件

要注入對象，需在property中添加ref=“該類在bean中的name”，例如本次的 “c”是Category在bean中的name值

<?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.yyt.pojo.Category">
        <property name="id" value="1" />
        <property name="name" value="category 1" />
        
    </bean>
    <bean name="p" class="com.yyt.pojo.Product">
        <property name="id" value="1" />
        <property name="name" value="product 1" />
        <property name="price" value="8848" />
        <property name="category" ref="c" />
    </bean>
  
</beans>

六、Test類

package com.yyt.test;

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

import com.yyt.pojo.Category;
import com.yyt.pojo.Product;

public class Test {

    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext(
                new String[] {"applicationContext.xml"});
        Category cg = (Category) context.getBean("c");
        System.out.println("id:"+cg.getId()+" name:"+cg.getName());
        
        
        Product p = (Product) context.getBean("p");
        System.out.println("id:"+p.getId()+" name:"+p.getName()+" price:"+p.getPrice());
        //輸出注入的對象
        System.out.println(p.getCategory().getName());

    }

}

注：基於框架的程序要成功運行，對於JAR包的版本，配置文件的正確性有着苛刻的要求，任何一個地方出錯了，都會導致框架程序運行失敗。

該項目上傳了GitHub：https://github.com/yeyangtao/Spring