(三)Spring详解——创建bean实例

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Bean配置

Bean的定义

id，bean的名字，实例名，必须唯一(name，别名也必须唯一）
class,全类名
Bean的创建方式（三种方式）
Bean之间的关系（两种依赖注入方式)

先附上实体类和工厂类

public class Goods {    private String name;    private double price;    private int num;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public double getPrice() {        return price;    }    public void setPrice(double price) {        this.price = price;    }    public int getNum() {        return num;    }    public void setNum(int num) {        this.num = num;    }    public Goods(String name, double price, int num) {        super();        this.name = name;        this.price = price;        this.num = num;    }    public Goods() {    }}

public class GoodsFactory {    public static Goods newInstance(String name, double price, int num) {        return new Goods(name, price, num);    }    public Goods createGoods(String name, double price, int num) {        return new Goods(name, price, num);    }}

Bean实例的创建

默认构造器

<bean id="good" class="com.shinerio.domain.Goods"></bean>

带参构造器

    <bean id="good" class="com.shinerio.domain.Goods">        <constructor-arg index="0" value="可乐"></constructor-arg>        <constructor-arg index="1" value="3.0"></constructor-arg>        <constructor-arg index="2" value="100"></constructor-arg>    </bean>

工厂类的静态方法

    <bean id="good" class="com.shinerio.factory.GoodsFactory" factory-method="newInstance">        <constructor-arg index="0" value="可乐"></constructor-arg>        <constructor-arg index="1" value="3.0"></constructor-arg>        <constructor-arg index="2" value="100"></constructor-arg>    </bean>

工厂类的实例方法

<bean id="goodsFactory" class="com.shinerio.factory.GoodsFactory"> </bean>    <bean id="good" class="com.shinerio.domain.Goods" factory-bean="goodsFactory" factory-method="createGoods">        <constructor-arg index="0" value="可乐"></constructor-arg>        <constructor-arg index="1" value="3.0"></constructor-arg>        <constructor-arg index="2" value="100"></constructor-arg>    </bean>

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