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

5

6


7

8

9

10



11

12

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

5

6

7

8


9

10

11

12



13

14



15

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

5

6

7

8

9

10


11

12

13

14



15

16

17



18

19

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

5

6

7

8

9

10


11

12

13

14



15

16

17



18

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

5

6

7

8

9

10


11

12

13

14



15

16



17

18

19



20

21

22

23



24

25

26

27

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
>

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

现在开始写测试类,Test.java
1
/** */
/**
2
*
3
*/
4
package
com;
5
6


2

3

4

5

6
