依赖检查

依赖检查

Spring中的Bean中有种依赖检查模式：none、simple、object、all

1、  none：不进行依赖检查

<?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-2.0.xsd">

  <bean id="emp" class="cn.csdn.domain.Emp" scope="singleton"/>

  <bean id="empServiceImpl" class="cn.csdn.service.EmpServiceImpl" scope="singleton" dependency-check="none">

     <property name="name">

        <value>kouxiaolin</value>

     </property>

     <property name="email">

       <value>[e-mail]</value>

     </property>

     <property name="list">

       <list>

        <ref bean="emp"/>

       </list>

     </property>

   </bean>

</beans>

 2、

  simple

 

simple

 

：

对于原始类型及集合（除协作者外的一切东西）执行依赖检查

 

 

3、  object：对依赖的对象进行检查（仅对协作者执行依赖检查）

<?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-2.0.xsd">

  <bean id="emp" class="cn.csdn.domain.Emp" scope="singleton"/>

  <bean id="empServiceImpl" class="cn.csdn.service.EmpServiceImpl" scope="singleton" dependency-check="object">

     <property name="name">

        <value>kouxiaolin</value>

     </property>

     <property name="email">

       <value>[e-mail]</value>

     </property>

     <property name="list">

       <list>

        <ref bean="emp"/>

       </list>

     </property>

   </bean>

</beans>

  

 

 

4、  all：对全部属性进行检查

<?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-2.0.xsd">

  <bean id="emp" class="cn.csdn.domain.Emp" scope="singleton"/>

  <bean id="empServiceImpl" class="cn.csdn.service.EmpServiceImpl" scope="singleton" dependency-check="all">

     <property name="name">

        <value>kouxiaolin</value>

     </property>

     <property name="email">

       <value>[e-mail]</value>

     </property>

     <property name="list">

       <list>

        <ref bean="emp"/>//引用上一个bean用<ref bean=”emp”/>

       </list>

     </property>

   </bean>

</beans>

 注：

bean类中如果没有属性只有set方法会不会出错啊？

答案是没有错，因为依赖检查主要是检查bean中的setter方法的属性是否在配置文件中设置property属性

Bean

类

 

备注：

依赖检查主要是检查bean中的setter方法的属性是否在配置文件中设置property属性如果没有设置就会出现bug：

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'empServiceImpl' defined in file [D:\Workspaces\MyEclipse 8.6\20110419_04\bin\check.xml]: Unsatisfied dependency expressed through bean property 'email': Set this property value or disable dependency checking for this bean.