WEB开发中Spring AOP实际应用一例

public interface CheckInterface {
  public abstract void check(String name);
  public abstract void excute(String name);
}

　　再做一个基类：

public abstract class BaseClass implements CheckInterface {
public BaseClass() {
}
public void check(String name){
if (name.equals("supervisor"))
System.out.println("Check Pass!!");
else {
System.out.println("No access privilege! Please do sth. else!");
}
}
}

　　再做一个测试类：

public class ExcuteClass extends BaseClass {
public ExcuteClass() {
}

public void excute(String name){
System.out.println("Excute here!"+name);
}
}

　　好了，下面做一个通知类（Advice）：

import org.springframework.aop.MethodBeforeAdvice;
import java.lang.reflect.Method;
import org.apache.log4j.Logger;

public class BeforeAdvisor implements MethodBeforeAdvice {
private static Logger logger=Logger.getLogger(BeforeAdvisor.class);
public void before(Method m, Object[] args, Object target) throws Throwable {
if (target instanceof CheckInterface){
logger.debug("Is Instanceof CheckInterface!!!");
CheckInterface ci=(CheckInterface)target;
ci.check((String)args[0]);
}
}
}

　　其中重要的before方法的参数：Object target传入的通知的对象（即测试类的接口），Method m, Object[] args分别是该对象被调用的方法和参数。我们再来作spring bean定义xml文件：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<description>Spring Quick Start</description>
<bean id="MyAdvisor" class="com.wysm.netstar.test.springaop.BeforeAdvisor"/>

<bean id="myPointcutAdvisor2" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">
<property name="advice">
<ref local="MyAdvisor" />
</property>
<property name="patterns">
<list>
<value>.*excute.*</value>
</list>
</property>
</bean>

<bean id="checkInterface" class="com.wysm.netstar.test.springaop.ExcuteClass"/>

<bean id="myCheckClass" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="proxyInterfaces">
<value>com.wysm.netstar.test.springaop.CheckInterface</value>
</property>
<property name="target">
<ref local="checkInterface" />
</property>
<property name="interceptorNames">
<value>myPointcutAdvisor2</value>
</property>
</bean>

</beans>

　　这个定义文件指明了ExcuteClass为监视对象，它的excute方法被执行的时候，BeforeAdvisor将被调用。

　　最后是测试类：

import junit.framework.TestCase;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;

public class SpringTestCase2 extends TestCase {
CheckInterface test=null;

    protected void setUp() throws Exception {
super.setUp();
ApplicationContext ctx=new FileSystemXmlApplicationContext("src/com/wysm/netstar/test/springaop/aoptest.xml");
test = (CheckInterface) ctx.getBean("myCheckClass");
}

    protected void tearDown() throws Exception {
super.tearDown();
}
public void testExcute(){
test.excute("supervisor");
}
}

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