java - Spring框架中autowire,by name和by type有什么区别

Question

下面代码autowire="byName"意思是通过id="userDao"来查找Bean中的userDao对象是吗？

      若autowire="byType"意思是通过 class="cn.com.bochy.dao.impl.UserDaoImpl"来查找UserDaoImpl下所有的对象。

这样理解对吗？？

<bean id="userServiceImpl"
            class="cn.com.bochy.service.impl.UserServiceImpl"
            autowire="byName">
       </bean>  
      <bean id="userDao"                                         

             class="cn.com.bochy.dao.impl.UserDaoImpl">
</bean>

这个问题已解决，总结如下：
spring中装配bean的基础知识如下：
1.<bean id="" class="">,bean是spring中最基本的配置单元，通过<bean>spring将创建一个对象。id属性定义了bean的名字，同时也作为该bean在spring容器中的引用。

Answer 1

byName就是通过Bean的id或者name，byTypeIt is based on the type of Bean Class.

Answer 2

If an attribute name in

Spring里，autowire="byName"的意思是，如果一个bean的name和另一个bean is the same, it will be automatically associated.

The following examples, customer是一个bean，她有一个叫address的属性，Spring会在当前容器里找一个叫address的beanand relate them. If not found, do nothing.

<!-- customer has a property name "address" -->
<bean id="customer" class="com.test.common.Customer" autowire="byName" />
    
<bean id="address" class="com.test.common.Address" >
    <property name="fulladdress" value="Block A 888, CA" />
</bean>

customer

package com.test.common;
 
public class Customer 
{
    private Address address;
    //...
}

address

package com.test.common;
 
public class Address 
{
    private String fulladdress;
    //...
}

Answer 3

It is recommended to read "Spring in Action" Chapter 3, Section 1, "Automatic Wiring of Bean Properties"