???? ?經過這段日子的學習和使用Spring,慢慢地體會到Spring的優妙之處，正在深入地吸收Spring的精華，呵呵?，F在寫的這個只是個簡單AOP例子,包括前置通知，后置通知,環繞通知,和目標對象。寫這個例子的主要目標只是想讓想學AOP的能更快地入門，了解一下如何去配置AOP里面的東東。
目標對象的接口:IStudent.java
?1
/**?*/
/**
?2
?*?
?3
?
*/
?4
package
?com.dragon.study;
?5
?6
/**?*/
/**
?7
?*?
@author
?dragon
?8
?*
?9
?
*/
10
public
?
interface
?IStudent?
{
11
????
12
????
public
?
void
?addStudent(String?name);
13
}
14
目標類:StudentImpl.java
?1
/**?*/
/**
?2
?*?
?3
?
*/
?4
package
?com.dragon.study.Impl;
?5
?6
import
?com.dragon.study.IStudent;
?7
?8
/**?*/
/**
?9
?*?
@author
?dragon
10
?*
11
?
*/
12
public
?
class
?StudentImpl?
implements
?IStudent
{
13
14
?????
public
?
void
?addStudent(String?name)
{
15
?????????System.out.println(
"
歡迎?
"
+
name
+
"
?你加入Spring家庭!
"
);
16
?????}
17
}
18
前置通知:BeforeAdvice.java
?1
/**?*/
/**
?2
?*?
?3
?
*/
?4
package
?com.dragon.Advice;
?5
?6
import
?java.lang.reflect.Method;
?7
?8
import
?org.springframework.aop.MethodBeforeAdvice;
?9
10
/**?*/
/**
11
?*?
@author
?dragon
12
?*
13
?
*/
14
public
?
class
?BeforeAdvice?
implements
?MethodBeforeAdvice
{
15
16
??????
public
?
void
?before(Method?method,Object[]?args,?Object?target)
17
???????????????
throws
?Throwable
{
18
??????????
19
??????????System.out.println(
"
這是BeforeAdvice類的before方法.
"
);
20
??????????
21
??????}
22
}
23
后置通知:AfterAdvice.java
?1/**?*//**
?2?*?
?3?*/
?4package?com.dragon.Advice;
?5
?6import?java.lang.reflect.Method;
?7
?8import?org.springframework.aop.AfterReturningAdvice;
?9
10/**?*//**
11?*?@author?dragon
12?*
13?*/
14public?class?AfterAdvice?implements?AfterReturningAdvice{
15????
16????public?void?afterReturning(Object?returnValue?,Method?method,
17???????????????????Object[]?args,Object?target)?throws?Throwable{
18????????System.out.println("這是AfterAdvice類的afterReturning方法.");
19????}
20??????
21
22}
23
環繞通知:CompareInterceptor.java
?1/**?*//**
?2?*?
?3?*/
?4package?com.dragon.Advice;
?5
?6import?org.aopalliance.intercept.MethodInterceptor;
?7import?org.aopalliance.intercept.MethodInvocation;
?8
?9
10/**?*//**
11?*?@author?dragon
12?*
13?*/
14public?class?CompareInterceptor?implements?MethodInterceptor{
15
16??????public?Object?invoke(MethodInvocation?invocation)?throws?Throwable{
17??????????Object?result?=?null;
18?????????String?stu_name?=?invocation.getArguments()[0].toString();
19?????????if?(?stu_name.equals("dragon")){
20?????????????//如果學生是dragon時,執行目標方法,
21??????????????result=?invocation.proceed();
22??????????????
23?????????}?else{
24?????????????System.out.println("此學生是"+stu_name+"而不是dragon,不批準其加入.");
25?????????}
26????????
27??????????return?result;
28??????}
29}
30 配置文件applicationContext.xml
?1<?xml?version="1.0"?encoding="UTF-8"?>
?2<!DOCTYPE?beans?PUBLIC?"-//SPRING//DTD?BEAN//EN"?"http://www.springframework.org/dtd/spring-beans.dtd">
?3
?4<beans>
?5
?6<bean?id="beforeAdvice"?class="com.dragon.Advice.BeforeAdvice"></bean>
?7<bean?id="afterAdvice"?class="com.dragon.Advice.AfterAdvice"></bean>
?8<bean?id="compareInterceptor"?class="com.dragon.Advice.CompareInterceptor"></bean>
?9<bean?id="studenttarget"?class="com.dragon.study.Impl.StudentImpl"></bean>
10
11<bean?id="student"?class="org.springframework.aop.framework.ProxyFactoryBean">
12??<property?name="proxyInterfaces">
13????<value>com.dragon.study.IStudent</value>
14??</property>
15??<property?name="interceptorNames">
16????<list>
17?????<value>beforeAdvice</value>
18?????<value>afterAdvice</value>
19????<value>compareInterceptor</value>??
20????</list>
21??</property>
22??<property?name="target">
23????<ref?bean="studenttarget"/>
24??</property>
25
26</bean>
27
28
29
30
31</beans> ? 現在開始寫測試類,Test.java
?1/**?*//**
?2?*?
?3?*/
?4package?com;
?5
?6import?org.springframework.context.ApplicationContext;
?7import?org.springframework.context.support.FileSystemXmlApplicationContext;
?8
?9import?com.dragon.study.IStudent;
10
11/**?*//**
12?*?@author?dragon
13?*
14?*/
15public?class?Test?{
16
17????/**?*//**
18?????*?@param?args
19?????*/
20????public?static?void?main(String[]?args)?{
21????????//?TODO?Auto-generated?method?stub
22??????ApplicationContext?ctx?=?
23??????????new?FileSystemXmlApplicationContext("/com/dragon/applicationContext.xml");
24??????
25??????IStudent?person?=?(IStudent)ctx.getBean("student");
26??????person.addStudent("dragon");
27??????
28//??????person.addStudent("javadragon");
29????}
30
31}
32
posted on 2006-12-03 03:29
javadragon 閱讀(76758)
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