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spring入门（8）--装配Bean之自动装配
Spring_Autowiringcollaborators
在Spring3.2.2中自动装配类型，分别为：no(default)(不采用自动装配)、byName，byType，constructor下面来分别介绍一下这些是如何自动装配的
<beanid="foo"class="...Foo"autowire="autowiretype">
Mode Explanation
no:(Default)Noautowiring.Beanreferencesmustbedefinedviaarefelement.
Changingthedefaultsettingisnotrecommendedforlargerdeployments,
becausespecifyingcollaboratorsexplicitlygivesgreatercontrolandclarity.
Tosomeextent,itdocumentsthestructureofasystem.
byName:Autowiringbypropertyname.
Springlooksforabeanwiththesamenameasthepropertythatneedstobeautowired.
Forexample,ifabeandefinitionissettoautowirebyname,
anditcontainsamasterproperty(thatis,ithasasetMaster(..)method),
Springlooksforabeandefinitionnamedmaster,andusesittosettheproperty.
byType:Allowsapropertytobeautowiredifexactlyonebeanofthepropertytypeexistsinthecontainer.
Ifmorethanoneexists,afatalexceptionisthrown,
whichindicatesthatyoumaynotusebyTypeautowiringforthatbean.
Iftherearenomatchingbeans,nothinghappens;thepropertyisnotset.
constructor：AnalogoustobyType,butappliestoconstructorarguments.
Ifthereisnotexactlyonebeanoftheconstructorargumenttypeinthecontainer,afatalerrorisraised
案例分析：
1、创建CumputerBean类
- packagewww.csdn.spring.autowire.bean;
- publicclassCumputerBean{
- //电脑名称
- privateStringname;
- publicvoidsetName(Stringname){
- this.name=name;
- }
- }
package www.csdn.spring.autowire.bean;
public class CumputerBean {
// 电脑名称
private String name;
public void setName(String name) {
this.name = name;
}
}
2、创建DeptBean类
- packagewww.csdn.spring.autowire.bean;
- publicclassDeptBean{
- //部门名称
- privateStringname;
- publicvoidsetName(Stringname){
- this.name=name;
- }
- }
package www.csdn.spring.autowire.bean;
public class DeptBean {
//部门名称
private String name;
public void setName(String name) {
this.name = name;
}
}
3、创建EmployeeBean
- packagewww.csdn.spring.autowire.bean;
- publicclassEmployeeBean{
- privateDeptBeandeptBean;
- privateCumputerBeancumputerBean;
- publicvoidsetDeptBean(DeptBeandeptBean){
- this.deptBean=deptBean;
- }
- publicvoidsetCumputerBean(CumputerBeancumputerBean){
- this.cumputerBean=cumputerBean;
- }
- @Override
- publicStringtoString(){
- return"EmployeeBean[deptBean="+deptBean+",cumputerBean="
- +cumputerBean+"]";
- }
- }
package www.csdn.spring.autowire.bean;
public class EmployeeBean {
private DeptBean deptBean;
private CumputerBean cumputerBean;
public void setDeptBean(DeptBean deptBean) {
this.deptBean = deptBean;
}
public void setCumputerBean(CumputerBean cumputerBean) {
this.cumputerBean = cumputerBean;
}
@Override
public String toString() {
return "EmployeeBean [deptBean=" + deptBean + ", cumputerBean="
+ cumputerBean + "]";
}
}
首先分析no、byName、byType的配置都是采用setter方法依赖注入实现的案例
1、no配置（通过ref=””引用需要的bean）
- <?xmlversion="1.0"encoding="UTF-8"?>
- <beansxmlns="http://www.springframework.org/schema/beans"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://www.springframework.org/schema/beans
- http://www.springframework.org/schema/beans/spring-beans.xsd">
- <!--电脑bean-->
- <beanid="cumputerBean"class="www.csdn.spring.autowire.bean.CumputerBean">
- <propertyname="name"value="HP6325笔记本"/>
- </bean>
- <!--部门bean-->
- <beanid="deptBean"class="www.csdn.spring.autowire.bean.DeptBean">
- <propertyname="name"value="CSDN教育事业部"/>
- </bean>
- <!--员工bean根据EmployeeBean中的属性名称去匹配-->
- <beanid="employeeBean"class="www.csdn.spring.autowire.bean.EmployeeBean">
- <propertyname="cumputerBean"ref="cumputerBean"/>
- <propertyname="deptBean"ref="deptBean"/>
- </bean>
- </beans>
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 电脑bean -->
<bean id="cumputerBean" class="www.csdn.spring.autowire.bean.CumputerBean">
<property name="name" value="HP6325笔记本" />
</bean>
<!-- 部门bean -->
<bean id="deptBean" class="www.csdn.spring.autowire.bean.DeptBean">
<property name="name" value="CSDN教育事业部" />
</bean>
<!-- 员工bean 根据EmployeeBean中的 属性名称 去匹配-->
<bean id="employeeBean" class="www.csdn.spring.autowire.bean.EmployeeBean">
<property name="cumputerBean" ref="cumputerBean" />
<property name="deptBean" ref="deptBean" />
</bean>
</beans>
2、byName配置(分析:会根据EmployeeBean中属性的名称自动装配)
- <?xmlversion="1.0"encoding="UTF-8"?>
- <beansxmlns="http://www.springframework.org/schema/beans"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://www.springframework.org/schema/beans
- http://www.springframework.org/schema/beans/spring-beans.xsd">
- <!--电脑bean-->
- <beanid="cumputerBean"class="www.csdn.spring.autowire.bean.CumputerBean">
- <propertyname="name"value="HP6325笔记本"/>
- </bean>
- <!--部门bean-->
- <beanid="deptBean"class="www.csdn.spring.autowire.bean.DeptBean">
- <propertyname="name"value="CSDN教育事业部"/>
- </bean>
- <!--员工bean-->
- <beanid="employeeBean"class="www.csdn.spring.autowire.bean.EmployeeBean"autowire="byName"/>
- </beans>
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 电脑bean -->
<bean id="cumputerBean" class="www.csdn.spring.autowire.bean.CumputerBean">
<property name="name" value="HP6325笔记本" />
</bean>
<!-- 部门bean -->
<bean id="deptBean" class="www.csdn.spring.autowire.bean.DeptBean">
<property name="name" value="CSDN教育事业部" />
</bean>
<!-- 员工bean-->
<bean id="employeeBean" class="www.csdn.spring.autowire.bean.EmployeeBean" autowire="byName"/>
</beans>
3、byType配置(分析:会根据EmployeeBean中属性的类型自动装配)
- <?xmlversion="1.0"encoding="UTF-8"?>
- <beansxmlns="http://www.springframework.org/schema/beans"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://www.springframework.org/schema/beans
- http://www.springframework.org/schema/beans/spring-beans.xsd">
- <!--电脑bean-->
- <beanid="cumputerBean"class="www.csdn.spring.autowire.bean.CumputerBean">
- <propertyname="name"value="HP6325笔记本"/>
- </bean>
- <!--部门bean-->
- <beanid="deptBean"class="www.csdn.spring.autowire.bean.DeptBean">
- <propertyname="name"value="CSDN教育事业部"/>
- </bean>
- <!--员工bean根据EmployeeBean中的属性名称去匹配-->
- <beanid="employeeBean"class="www.csdn.spring.autowire.bean.EmployeeBean"autowire="byType"/>
- </beans>
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 电脑bean -->
<bean id="cumputerBean" class="www.csdn.spring.autowire.bean.CumputerBean">
<property name="name" value="HP6325笔记本" />
</bean>
<!-- 部门bean -->
<bean id="deptBean" class="www.csdn.spring.autowire.bean.DeptBean">
<property name="name" value="CSDN教育事业部" />
</bean>
<!-- 员工bean 根据EmployeeBean中的 属性名称 去匹配-->
<bean id="employeeBean" class="www.csdn.spring.autowire.bean.EmployeeBean" autowire="byType"/>
</beans>
注意：当根据byType类型装配时，当在容器内找到多个匹配的类型时会出现如下bug
org.springframework.beans.factory.UnsatisfiedDependencyException:
Errorcreatingbeanwithname'employeeBean'definedinclasspathresource[spring-byType.xml]:Unsatisfieddependencyexpressedthroughbeanproperty'deptBean'::
Noqualifyingbeanoftype[www.csdn.spring.autowire.bean.DeptBean]isdefined:expectedsinglematchingbeanbutfound2:deptBean,deptBean1;
nestedexceptionisorg.springframework.beans.factory.NoUniqueBeanDefinitionException:
Noqualifyingbeanoftype[www.csdn.spring.autowire.bean.DeptBean]isdefined:expectedsinglematchingbeanbutfound2:deptBean,deptBean1
4、Constructor(构造器参数根据byType类型匹配，自动装配)
首先修改EmployeeBean类修改后代码如下：
- packagewww.csdn.spring.autowire.bean;
- publicclassEmployeeBean{
- privateDeptBeandeptBean;
- privateCumputerBeancumputerBean;
- publicEmployeeBean(DeptBeandeptBean,CumputerBeancumputerBean){
- super();
- this.deptBean=deptBean;
- this.cumputerBean=cumputerBean;
- }
- @Override
- publicStringtoString(){
- return"EmployeeBean[deptBean="+deptBean+",cumputerBean="
- +cumputerBean+"]";
- }
- }
package www.csdn.spring.autowire.bean;
public class EmployeeBean {
private DeptBean deptBean;
private CumputerBean cumputerBean;
public EmployeeBean(DeptBean deptBean, CumputerBean cumputerBean) {
super();
this.deptBean = deptBean;
this.cumputerBean = cumputerBean;
}
@Override
public String toString() {
return "EmployeeBean [deptBean=" + deptBean + ", cumputerBean="
+ cumputerBean + "]";
}
}
配置文件操作：
- <?xmlversion="1.0"encoding="UTF-8"?>
- <beansxmlns="http://www.springframework.org/schema/beans"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://www.springframework.org/schema/beans
- http://www.springframework.org/schema/beans/spring-beans.xsd">
- <!--电脑bean-->
- <beanid="cumputerBean"class="www.csdn.spring.autowire.bean.CumputerBean">
- <propertyname="name"value="HP6325笔记本"/>
- </bean>
- <!--部门bean-->
- <beanid="deptBean"class="www.csdn.spring.autowire.bean.DeptBean">
- <propertyname="name"value="CSDN教育事业部"/>
- </bean>
- <!--员工bean根据EmployeeBean中的属性名称bytype去匹配-->
- <beanid="employeeBean"class="www.csdn.spring.autowire.bean.EmployeeBean"
- autowire="constructor">
- </bean>
- </beans>
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 电脑bean -->
<bean id="cumputerBean" class="www.csdn.spring.autowire.bean.CumputerBean">
<property name="name" value="HP6325笔记本" />
</bean>
<!-- 部门bean -->
<bean id="deptBean" class="www.csdn.spring.autowire.bean.DeptBean">
<property name="name" value="CSDN教育事业部" />
</bean>
<!-- 员工bean 根据EmployeeBean中的 属性名称 bytype 去匹配 -->
<bean id="employeeBean" class="www.csdn.spring.autowire.bean.EmployeeBean"
autowire="constructor">
</bean>
</beans>
说明:
1、当构造器的参数类型在容器中找不全时。
比如：
配置文件中只配置了CumpterBean时
- <?xmlversion="1.0"encoding="UTF-8"?>
- <beansxmlns="http://www.springframework.org/schema/beans"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://www.springframework.org/schema/beans
- http://www.springframework.org/schema/beans/spring-beans.xsd">
- <!--电脑bean-->
- <beanid="cumputerBean"class="www.csdn.spring.autowire.bean.CumputerBean">
- <propertyname="name"value="HP6325笔记本"/>
- </bean>
- <!--员工bean根据EmployeeBean中的属性名称bytype去匹配-->
- <beanid="employeeBean"class="www.csdn.spring.autowire.bean.EmployeeBean"
- autowire="constructor">
- </bean>
- </beans>
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 电脑bean -->
<bean id="cumputerBean" class="www.csdn.spring.autowire.bean.CumputerBean">
<property name="name" value="HP6325笔记本" />
</bean>
<!-- 员工bean 根据EmployeeBean中的 属性名称 bytype 去匹配 -->
<bean id="employeeBean" class="www.csdn.spring.autowire.bean.EmployeeBean"
autowire="constructor">
</bean>
</beans>
会出现如下bug:
org.springframework.beans.factory.UnsatisfiedDependencyException:
Errorcreatingbeanwithname'employeeBean'definedinclasspathresource[spring-constructors.xml]:Unsatisfieddependencyexpressedthroughconstructorargumentwithindex0oftype[www.csdn.spring.autowire.bean.DeptBean]::
Noqualifyingbeanoftype[www.csdn.spring.autowire.bean.DeptBean]foundfordependency:
expectedatleast1beanwhichqualifiesasautowirecandidateforthisdependency.Dependencyannotations:{};
nestedexceptionisorg.springframework.beans.factory.NoSuchBeanDefinitionException:
Noqualifyingbeanoftype[www.csdn.spring.autowire.bean.DeptBean]foundfordependency:
expectedatleast1beanwhichqualifiesasautowirecandidateforthisdependency.Dependencyannotations:{}
Causedby:
org.springframework.beans.factory.NoSuchBeanDefinitionException:
Noqualifyingbeanoftype[www.csdn.spring.autowire.bean.DeptBean]foundfordependency:
expectedatleast1beanwhichqualifiesasautowirecandidateforthisdependency.Dependencyannotations:{}
2、当配置文件找到构造器参数的类型有多个的时候比如配置文件如下：
- <?xmlversion="1.0"encoding="UTF-8"?>
- <beansxmlns="http://www.springframework.org/schema/beans"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://www.springframework.org/schema/beans
- http://www.springframework.org/schema/beans/spring-beans.xsd">
- <!--电脑bean-->
- <beanid="cumputerBean"class="www.csdn.spring.autowire.bean.CumputerBean">
- <propertyname="name"value="HP6325笔记本"/>
- </bean>
- <!--部门bean-->
- <beanid="deptBean"class="www.csdn.spring.autowire.bean.DeptBean">
- <propertyname="name"value="CSDN教育事业部"/>
- </bean>
- <!--部门bean-->
- <beanid="deptBean1"class="www.csdn.spring.autowire.bean.DeptBean">
- <propertyname="name"value="CSDN教育事业部"/>
- </bean>
- <!--员工bean根据EmployeeBean中的属性名称bytype去匹配-->
- <beanid="employeeBean"class="www.csdn.spring.autowire.bean.EmployeeBean"
- autowire="constructor">
- </bean>
- </beans>
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 电脑bean -->
<bean id="cumputerBean" class="www.csdn.spring.autowire.bean.CumputerBean">
<property name="name" value="HP6325笔记本" />
</bean>
<!-- 部门bean -->
<bean id="deptBean" class="www.csdn.spring.autowire.bean.DeptBean">
<property name="name" value="CSDN教育事业部" />
</bean>
<!-- 部门bean -->
<bean id="deptBean1" class="www.csdn.spring.autowire.bean.DeptBean">
<property name="name" value="CSDN教育事业部" />
</bean>
<!-- 员工bean 根据EmployeeBean中的 属性名称 bytype 去匹配 -->
<bean id="employeeBean" class="www.csdn.spring.autowire.bean.EmployeeBean"
autowire="constructor">
</bean>
</beans>
说明：上面配置有两个同样类型的DeptBean但是不会出现bug，原因是在EmployeeBean中构造器接受的参数名称与deptBean一致。
3、当配置文件找到构造器参数的类型有多个的时候比如配置文件如下：
- <?xmlversion="1.0"encoding="UTF-8"?>
- <beansxmlns="http://www.springframework.org/schema/beans"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://www.springframework.org/schema/beans
- http://www.springframework.org/schema/beans/spring-beans.xsd">
- <!--电脑bean-->
- <beanid="cumputerBean"class="www.csdn.spring.autowire.bean.CumputerBean">
- <propertyname="name"value="HP6325笔记本"/>
- </bean>
- <!--部门bean-->
- <beanid="deptBean1"class="www.csdn.spring.autowire.bean.DeptBean">
- <propertyname="name"value="CSDN教育事业部"/>
- </bean>
- <!--部门bean-->
- <beanid="deptBean2"class="www.csdn.spring.autowire.bean.DeptBean">
- <propertyname="name"value="CSDN教育事业部"/>
- </bean>
- <!--员工bean根据EmployeeBean中的属性名称bytype去匹配-->
- <beanid="employeeBean"class="www.csdn.spring.autowire.bean.EmployeeBean"
- autowire="constructor">
- </bean>
- </beans>
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 电脑bean -->
<bean id="cumputerBean" class="www.csdn.spring.autowire.bean.CumputerBean">
<property name="name" value="HP6325笔记本" />
</bean>
<!-- 部门bean -->
<bean id="deptBean1" class="www.csdn.spring.autowire.bean.DeptBean">
<property name="name" value="CSDN教育事业部" />
</bean>
<!-- 部门bean -->
<bean id="deptBean2" class="www.csdn.spring.autowire.bean.DeptBean">
<property name="name" value="CSDN教育事业部" />
</bean>
<!-- 员工bean 根据EmployeeBean中的 属性名称 bytype 去匹配 -->
<bean id="employeeBean" class="www.csdn.spring.autowire.bean.EmployeeBean"
autowire="constructor">
</bean>
</beans>
会出现如下bug（与byType的bug一致）:
- org.springframework.beans.factory.UnsatisfiedDependencyException:
- Errorcreatingbeanwithname'employeeBean'definedinclasspathresource[spring-constructors.xml]:
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'employeeBean' defined in class path resource [spring-constructors.xml]:
- Unsatisfieddependencyexpressedthroughconstructorargumentwithindex0oftype[www.csdn.spring.autowire.bean.DeptBean]::
- Noqualifyingbeanoftype[www.csdn.spring.autowire.bean.DeptBean]isdefined:
- expectedsinglematchingbeanbutfound2:deptBean1,deptBean2;
- nestedexceptionisorg.springframework.beans.factory.NoUniqueBeanDefinitionException:
- Noqualifyingbeanoftype[www.csdn.spring.autowire.bean.DeptBean]isdefined:
Unsatisfied dependency expressed through constructor argument with index 0 of type [www.csdn.spring.autowire.bean.DeptBean]: : No qualifying bean of type [www.csdn.spring.autowire.bean.DeptBean] is defined: expected single matching bean but found 2: deptBean1,deptBean2; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [www.csdn.spring.autowire.bean.DeptBean] is defined:
- expectedsinglematchingbeanbutfound2:deptBean1,deptBean2
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springframework 是sping 里面的一个开源框架...它实现了很优雅的MVC，对不同的数据访问技术提供了统一的接口，采用IOC使得可以很容易的实现bean的装配，提供了简洁的AOP并据此实现Transaction Management，等等......
spring-beans:Bean工厂与装配 spring-context:上下文，即IOC容器 spring-context-support:对IOC的扩展，以及IOC子容器 spring-context-indexer:类管理组件和Classpath扫描 spring-expression:表达式语句 切面编程： ...
本篇文章主要介绍了浅谈Spring装配Bean之组件扫描和自动装配，小编觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随小编过来看看吧
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