关于Advisor注入

最新推荐文章于 2022-08-20 17:11:09 发布

原创最新推荐文章于 2022-08-20 17:11:09 发布 · 846 阅读

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Spring 的Advisor注入可以根据接口注入，也可以按照实体类进行注入

1.根据接口注入

XML配置文件

<?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-3.0.xsd">

<bean id="executeMethodAdvisor" class="org.springframework.aop.support.NameMatchMethodPointcutAdvisor">
    <property name="mappedNames">
      <list>
        <value>execute</value>
      </list>
    </property>
    <property name="advice">
      <ref bean="afterExecuteAdvice"/>
    </property>
</bean>

<bean id="afterExecuteAdvice" class="advisor.AfterExecuteAdvice">
</bean>

<bean id="targetBeanTarget" class="advisor.TargetBean">
</bean>

<bean id="proxyBean" class="org.springframework.aop.framework.ProxyFactoryBean">
    <property name="proxyInterfaces">

<list>
<value>advisor.TargetInterface</value>

      </list>
    </property>
    <property name="interceptorNames">
      <list>
        <value>executeMethodAdvisor</value>
      </list>
    </property>
    <property name="target">
      <ref bean="targetBeanTarget"/>
    </property>
</bean>
</beans>

Java文件

public class TargetBean implements TargetInterface{

public void execute(){

...

}

2. 根据具体类注入，只需把上边的<property name="proxyInterfaces">去掉，同时令TargetBean不实现接口即可。

xml文件

<bean id="targetBean" class="org.springframework.aop.framework.ProxyFactoryBean">
    <property name="interceptorNames">
      <list>
        <value>executeMethodAdvisor</value>
      </list>
    </property>
    <property name="target">
      <ref bean="targetBeanTarget"/>
    </property>
</bean>

Java文件

public class TargetBean {

public void execute(){

...

}

注意，这种情况必须引入cglib-nodep.jar，否则抛出异常

Cannot proxy target class because CGLIB2 is not available. Add CGLIB to the class path or specify proxy interfaces.

异常原因可在org.springframework.aop.framework。DefaultAopProxyFactory中找到

public class DefaultAopProxyFactory implements AopProxyFactory, Serializable {

    /** Whether the CGLIB2 library is present on the classpath */
    private static final boolean cglibAvailable =
            ClassUtils.isPresent("net.sf.cglib.proxy.Enhancer", DefaultAopProxyFactory.class.getClassLoader());

    public AopProxy createAopProxy(AdvisedSupport config) throws AopConfigException {
        if (config.isOptimize() || config.isProxyTargetClass() || hasNoUserSuppliedProxyInterfaces(config)) {
            Class targetClass = config.getTargetClass();
            if (targetClass == null) {
                throw new AopConfigException("TargetSource cannot determine target class: " +
                        "Either an interface or a target is required for proxy creation.");
            }
            if (targetClass.isInterface()) {
                return new JdkDynamicAopProxy(config);
            }
            if (!cglibAvailable) {
                throw new AopConfigException(
                        "Cannot proxy target class because CGLIB2 is not available. " +
                        "Add CGLIB to the class path or specify proxy interfaces.");
            }
            return CglibProxyFactory.createCglibProxy(config);
        }
        else {
            return new JdkDynamicAopProxy(config);
        }
    }
......