Spring-DI

1.用构造器注入

    1>通过参数的顺序
        <bean id="student" class="com.sn.domain.Student"></bean>
        <bean id="person" class="com.sn.domain.Person">
            <constructor-arg index="0" value="bbbcccc"></constructor-arg>
            <constructor-arg index="1" ref="student"></constructor-arg>
        </bean>
    2>通过参数的类型
        <bean id="student" class="com.sn.domain.Student"></bean>
        <bean id="person" class="com.sn.domain.Person">
            <constructor-arg type="java.lang.String">
                <value>dddddddddd</value>
            </constructor-arg>
            <constructor-arg type="com.sn.domain.Student">
                <ref bean="student"/>
            </constructor-arg>
        </bean>

2.使用属性setting方法进行注入
    
　　2.1实体类中生成getter和setter方法
　　2.2 applicationContext.xml中配置
　　<bean id="person" class="com.sn.Person">
          <property name="pid" value="1"></property>
          <property name="name" value="王二麻子"></property>
          <property name="student" ref="student"></property>
          <property name="lists">
              <list>
                  <value>list1</value>
                  <value>list2</value>
                  <ref bean="student"/>
              </list>
          </property>
          <property name="sets">
              <set>
                  <value>set1</value>
                  <value>set2</value>
                  <ref bean="student"/>
              </set>
          </property>
          <property name="map">
              <map>
                  <entry key="entry1">
                      <value>map1</value>
                  </entry>
                  <entry key="entry2">
                      <ref bean="student"/>
                  </entry>
              </map>
          </property>
          <property name="properties">
              <props>
                  <!-- 
                      不需要引用类型
                   -->
                  <prop key="prop1">prop1</prop>
                  <prop key="prop2">prop2</prop>
              </props>
          </property>
          <property name="objects">
              <list>
                  <value>aa</value>
                  <value>bb</value>
              </list>
          </property>
      </bean>