一个超级简单的Spring注入的问题,为什么说找不到property? 内详...

Question

我有一个类:public class HPServiceImpl implements HPService
{
private HPDao dao;

public void setHPDao(HPDao dao)
{
this.dao = dao;
}

@Override
public int getHp()
{
return dao.getHp();
}
}
它的Bean定义: <bean id="hpService" class="org.mycompany.spring.aop.service.impl.HPServiceImpl">   
<property name="dao">
<ref bean="hpDao" />
</property>
</bean>
// -----------------------------------------------------------------------------------------------引用了hpDao的Bean:  <bean id="hpDao" class="org.mycompany.spring.aop.dao.impl.HPDaoImpl"/>
hpDao的实际类是:public class HPDaoImpl implements HPDao
{
@Override
public int getHp()
{
return (int)(Math.random() * 100);
}
}
// -----------------------------------------------------------------------------------------------我用一个main去调用它:public class Main
{
public static void main(String[] args)
{
ApplicationContext context= new ClassPathXmlApplicationContext("classpath*:spring/application-*.xml");

(HPService)context.getBean("hpService");
}
}
运行抛出了异常:Caused by: org.springframework.beans.InvalidPropertyException: Invalid property 'dao' of bean class [org.mycompany.spring.aop.service.impl.HPServiceImpl]: No property 'dao' found
晕...说找不到'dao'. 我不是定义了吗: private HPDao dao;

Answer 1

  public void setHPDao(HPDao dao)
    {
        this.dao = dao;
    }
  <property name="hPDao">
            <ref bean="hpDao" />
        </property>
setter方法名，去掉前面三个字符，然后第四个字符转成小写。