Spring2

上一个中，对category的name属性注入了"category 1"字符串 
这次，对product对象，注入一个category对象

一、新建项目

二、导包

三、新建category类

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类，将添加一个category类型属性

package com.yyt.pojo;

public class product {
     private int id;
       private string name;
       private float price;
       private category category;

五、在src目录下新建applicationcontext.xml文件

要注入对象，需在property中添加ref=“该类在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类

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());
        //输出注入的对象
        system.out.println(p.getcategory().getname());

    }

}

注：基于框架的程序要成功运行，对于jar包的版本，配置文件的正确性有着苛刻的要求，任何一个地方出错了，都会导致框架程序运行失败。

该项目上传了github：https://github.com/yeyangtao/spring