Spring用bean.xml注入对象

Spring的对象注入
写一个类

public class Circle {    @Override    public String toString() {        return "Circle [radius=" + radius + "]";    }    private double radius;    public double getRadius() {        return radius;    }    public void setRadius(double radius) {        this.radius = radius;    }    public Circle() {        super();    }}

再创建一个bean.xml类

    <?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans.xsd">    <!-- //此行在调用加载时会创建一个Circle 一个bean节点对应一个对象为单例，下次再调用时依然还是以前创建的对象。执行的为为无参的构造方法 -->    <bean id="circle " class="com.bean.Circle" />    <!-- 也可以给对象属性设值 在类中一定要写set方法-->    <bean id="circle2" class="com.bean.Circle">       <property name="radius" value="2.0"></property>    </bean>    <!-- 可以使用上个对象的值 不过要先加载上个对象  -->    <bean id="circle3" class="com.bean.Circle">       <property name="radius" value="#{circle2.radius+1}"></property>    </bean></beans>

在代码中如何实现

   @Test     public void CircleTest(){            Circle circle=  (Circle) new ClassPathXmlApplicationContext("bean.xml").getBean("circle");            circle.setRadius(12);               System.out.println(circle);            Circle circle2=  (Circle) new ClassPathXmlApplicationContext("bean.xml").getBean("circle2");               System.out.println(circle2);            Circle circle3=  (Circle) new ClassPathXmlApplicationContext("bean.xml").getBean("circle3");               System.out.println(circle3);     }  

当类中的属性有引用类型

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans.xsd">      <!-- 当属性是引用类型时 用值用 ref -->      <bean id="xiaoming" class="com.bean.Student">       <property name="id" value="1"></property>       <property name="name" value="xiaoming"></property>       <property name="score" value="78"></property>        <property name="birthday" ref="birthday"></property>      </bean>      <bean id="birthday" class="com.bean.BirthDay">        <property name="year" value="1994"></property>       <property name="month" value="03"></property>       <property name="day" value="15"></property>      </bean>      </beans>

特殊属性如List Set 等

<bean id="myColl" class="com.phone1000.je1702.sp03.MyCollection">        <property name="array">            <array>                <value>zhangsan</value>                <value>zhaoziqiang</value>                <value>xiazenghao</value>                <value>hejiangtao</value>                <value>wucaibing</value>                <value>chenjianjian</value>                <value>hushengli</value>            </array>        </property>        <property name="list">            <list>                <value>wangjishen</value>                <value>hexiangyi</value>                <value>wanghailin</value>                <value>lizhiyang</value>            </list>        </property>        <property name="set">            <set>                <value>zhangruixuan</value>                <value>yangyubing</value>                <value>changzhongbo</value>                <value>zhoujunfeng</value>            </set>        </property>        <property name="map">            <map>                <entry key="banzhang" value="zhangjiandong"></entry>                <entry key="xuewei" value="changzhongbo"></entry>                <entry key="laowei" value="hushengli"></entry>                <entry key="kongwei" value="xujinxin"></entry>            </map>        </property>        <property name="props">            <props>                <prop key="driver">mysqldriver</prop>                <prop key="url">mysqlurl</prop>                <prop key="username">root</prop>                <prop key="password">root</prop>            </props>        </property>    </bean>

有参构造

<?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"    xsi:schemaLocation="http://www.springframework.org/schema/beans         http://www.springframework.org/schema/beans/spring-beans.xsd        http://www.springframework.org/schema/context          http://www.springframework.org/schema/context/spring-context.xsd">    <!-- <bean id="emp" class="com.sp05.Employee">        <constructor-arg name="sex" value="boy" />        <constructor-arg name="dept" ref="dept" />        <constructor-arg name="name" value="zhang"/>        <constructor-arg name="salary" value="10000" />    </bean> -->    <!-- <bean id="emp" class="com.sp05.Employee">        <constructor-arg name="name" value="zhang"/>        <constructor-arg name="salary" value="10000" />        <constructor-arg name="sex" value="boy" />        <constructor-arg name="dept" ref="dept" />        <property name="dept" ref="dept"></property>    </bean> -->    <!-- <bean id="emp" class="com.sp05.Employee">        <constructor-arg index="0" value="zhang"/>        <constructor-arg index="1"  value="10000" />        <constructor-arg index="2" value="boy" />        <constructor-arg index="3" ref="dept" />    </bean> -->    <!-- <bean id="emp" class="com.sp05.Employee">        <constructor-arg type="java.lang.String" value="zhang"/>        <constructor-arg type="double"  value="10000" />        <constructor-arg type="java.lang.String" value="boy" />        <constructor-arg type="com.sp05.Dept" ref="dept" />    </bean> -->    <bean id="emp" class="com.sp05.Employee">        <constructor-arg value="zhang"/>        <constructor-arg value="10000" />        <constructor-arg value="boy" />        <constructor-arg ref="dept" />    </bean>    <bean id="dept" class="com.sp05.Dept">        <property name="did" value="101" />        <property name="dname" value="java ee" />    </bean></beans>