出处：http://www.blogjava.net/javadragon/archive/2006/12/03/85115.html
经过这段日子的学习和使用Spring,慢慢地体会到Spring的优妙之处，正在深入地吸收Spring的精华，呵呵。现在写的这个只是个简单AOP例子,包括前置通知，后置通知,环绕通知,和目标对象。写这个例子的主要目标只是想让想学AOP的能更快地入门，了解一下如何去配置AOP里面的东东。
目标对象的接口: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
/**
2
* 3
*/ 4
package
com.dragon.study;
5
6
/**
7
* @author dragon8
*9
*/ 10
public
interface
IStudent
{
11
12
public void addStudent(String name);13
} 14
目标类: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( “ 欢迎 “ + name + “ 你加入Spring家庭! “ );
16
}
17}
18
/**
2
* 3
*/ 4
package
com.dragon.study.Impl;
5
6
import
com.dragon.study.IStudent;
7
8
/**
9
* @author dragon10
*11
*/ 12
public
class
StudentImpl
implements
IStudent
{
13
14
public void addStudent(String name) {15
System.out.println( “ 欢迎 “ + 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( “ 这是BeforeAdvice类的before方法. “ );
20
21 }
22}
23
/**
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 dragon12
*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( “ 这是BeforeAdvice类的before方法. “ );20
21
} 22
} 23
后置通知:AfterAdvice.java
1
/**
2 *
3 */
4
package
com.dragon.Advice;
5
6
import
java.lang.reflect.Method;
7
8
import
org.springframework.aop.AfterReturningAdvice;
9
10
/**
11 * @author dragon
12 *
13 */
14
public
class
AfterAdvice
implements
AfterReturningAdvice
{
15
16 public void afterReturning(Object returnValue ,Method method,
17 Object[] args,Object target) throws Throwable{
18 System.out.println(“这是AfterAdvice类的afterReturning方法.“);
19 }
20
21
22}
23
/**
2
* 3
*/4
package
com.dragon.Advice;
5
6
import
java.lang.reflect.Method;
7
8
import
org.springframework.aop.AfterReturningAdvice;
9
10
/**
11
* @author dragon12
*13
*/14
public
class
AfterAdvice
implements
AfterReturningAdvice
{
15
16
public void afterReturning(Object returnValue ,Method method,17
Object[] args,Object target) throws Throwable{18
System.out.println(“这是AfterAdvice类的afterReturning方法.“);19
}20
21
22
}23
环绕通知:CompareInterceptor.java
1
/**
2 *
3 */
4
package
com.dragon.Advice;
5
6
import
org.aopalliance.intercept.MethodInterceptor;
7
import
org.aopalliance.intercept.MethodInvocation;
8
9
10
/**
11 * @author dragon
12 *
13 */
14
public
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 //如果学生是dragon时,执行目标方法,
21 result= invocation.proceed();
22
23 } else{
24 System.out.println(“此学生是“+stu_name+“而不是dragon,不批准其加入.“);
25 }
26
27 return result;
28 }
29}
30
/**
2
* 3
*/4
package
com.dragon.Advice;
5
6
import
org.aopalliance.intercept.MethodInterceptor;
7
import
org.aopalliance.intercept.MethodInvocation;
8
9
10
/**
11
* @author dragon12
*13
*/14
public
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
//如果学生是dragon时,执行目标方法,21
result= invocation.proceed();22
23
} else{24
System.out.println(“此学生是“+stu_name+“而不是dragon,不批准其加入.“);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
>
<?
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
>
现在开始写测试类,Test.java
1
/**
2 *
3 */
4
package
com;
5
6
import
org.springframework.context.ApplicationContext;
7
import
org.springframework.context.support.FileSystemXmlApplicationContext;
8
9
import
com.dragon.study.IStudent;
10
11
/**
12 * @author dragon
13 *
14 */
15
public
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
/**
2
* 3
*/4
package
com;
5
6
import
org.springframework.context.ApplicationContext;
7
import
org.springframework.context.support.FileSystemXmlApplicationContext;
8
9
import
com.dragon.study.IStudent;
10
11
/**
12
* @author dragon13
*14
*/15
public
class
Test
{
16
17
/**18
* @param args19
*/20
public static void main(String[] args) {21
// TODO Auto-generated method stub22
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
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