spring setter 注入 property name

在Java世界中有个约定（Convention）,那就是属性的设置和获取的方法名一般是:set+属性名(参数)及get+属性名()的方式。boolean类型稍有不同，可以使用is+属性名()方式来获取。

以下是一个示例。

public class MessageHandler {

    private MessageService messageService;

    public MessageService getMessageService() {
        return messageService;
    }

    public void setMessageService(MessageService messageService) {
        this.messageService = messageService;
    }

    public String handle() {
        return messageService.sendService();
    }
}

　　使用Setter方法注入如下所示。

<bean id="messageService" class="huangbowen.net.DependecyInjection.ConstructorInjection.SimpleMessageService"/>
    <bean id="messageHandler" class="huangbowen.net.DependecyInjection.SetterInjection.MessageHandler">
        <property name="messageService" ref="messageService"/>
    </bean>

　　如果property的name为messageService,那么必须在类中有个叫做setMessageService的方法，这样才能完成注入。如果将MessageHandler.java中的setMessageService方法改为setMessageService1，那么注入就会失败，失败message如下所示。

...
java.lang.IllegalStateException: Failed to load ApplicationContext

...
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'messageHandler' defined in class path resource [spring-context.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'messageService' of bean class [huangbowen.net.DependecyInjection.SetterInjection.MessageHandler]: Bean property 'messageService' is not writable or has an invalid setter method. Did you mean 'messageService1'?

...

　　via:http://www.cnblogs.com/huang0925/p/3606382.html