Spring

事先要这么一个类

1 Class GradeAction{//伪代码

2     public GradeAction(String aa);

3     public GradeAction(IInterviewGrade interviewGradeImpl);

4     public GradeAction();

5 }

Ioc（Inversion of control）:

• Setter方式注入

  • <bean id="gradeAction" class="action.GradeAction">
    
        <property name="interviewGradeImpl" ref="interviewGradeImpl" />
    
    </bean><!-- GradeAction();setInterviewGradeImpl(IInterviewGrade interviewGradeImpl) -->

• 构造器注入
  • 构造器参数类型匹配

    • <bean id="gradeAction" class="action.GradeAction">
      
          <constructor-arg type="dao.IInterviewGrade" ref="interviewGradeImpl"/>
      
      </bean><!-- GradeAction(IInterviewGrade interviewGradeImpl) -->

      <bean id="gradeAction" class="action.GradeAction">
      
          <constructor-arg type="java.lang.String" value="interviewGradeImpl"/>
      
      </bean><!-- GradeAction(String aa) -->

  • 构造器参数索引匹配

  • <bean id="gradeAction" class="action.GradeAction">
    
        <constructor-arg index="0" value="interviewGradeImpl"/>
    
    </bean><!-- GradeAction(String aa); -->

  • <bean id="gradeAction" class="action.GradeAction">
    
        <constructor-arg index="0" ref="interviewGradeImpl"/>
    
    </bean><!-- GradeAction(IInterviewGrade interviewGradeImpl) -->