Spring的依赖注入的2种方式（1天时间）

Posted 2020-10-02 多情剑客无情剑;

今天花了一天的时间才调试出来

private      接口   实现类的那个bean;

最后面的那个名字不能随便的写，必须是配置文件中，实现类的那个bean

就是后面的那个名字写错了，花了整整一天

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必须有这句注解扫描才能扫描到注解

 

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进行注解的配置，不需要get方法和set方法，小龙儿说xml文件配置才需要set方法

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package com.baobaotao1;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class CarServiceImpl implements CarService {
    
     private CarDao carDao;
     public void setCarDao(CarDao carDao) {
          this.carDao = carDao;
　　　}

        public void produceDi(){
            carDao.produceLun();
            System.out.println("閹绘劒绶垫惔鏇犳磸缂佹瑨婧呯�涳拷");
        }
        
        public static void main(String[] args){
        System.out.println(123);    
        ApplicationContext ctx = 
                new ClassPathXmlApplicationContext("applicationContext.xml"); 
        CarService boss = (CarService) ctx.getBean("carService");
                boss.produceDi();
        }
}

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name \'carTest\' defined in class path resource [applicationContext.xml]: Cannot resolve reference to bean \'carService\' while setting bean property \'carService\'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name \'carService\' defined in class path resource [applicationContext.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property \'carDao\' of bean class [com.baobaotao1.CarServiceImpl]: Bean property \'carDao\' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?

 

 

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