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
*/
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package
com.dragon.study;
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6
/** */
/**
7
* @author dragon
8
*
9
*/
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public
interface
IStudent
{
11
12
public void addStudent(String name);
13
}
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/** */
/** 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
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/** */
/**
2
*
3
*/
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package
com.dragon.study.Impl;
5
6
import
com.dragon.study.IStudent;
7
8
/** */
/**
9
* @author dragon
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*
11
*/
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public
class
StudentImpl
implements
IStudent
{
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public void addStudent(String name)
{
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System.out.println( " 欢迎 " + name + " 你加入Spring家庭! " );
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}
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}
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/** */
/** 2
* 3
*/
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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

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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
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/** */
/**
2
*
3
*/
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package
com.dragon.Advice;
5
6
import
java.lang.reflect.Method;
7
8
import
org.springframework.aop.MethodBeforeAdvice;
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10
/** */
/**
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* @author dragon
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*
13
*/
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public
class
BeforeAdvice
implements
MethodBeforeAdvice
{
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public void before(Method method,Object[] args, Object target)
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throws Throwable
{
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System.out.println( " 这是BeforeAdvice类的before方法. " );
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}
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}
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/** */
/** 2
* 3
*/
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package
com.dragon.Advice;5

6
import
java.lang.reflect.Method;7

8
import
org.springframework.aop.MethodBeforeAdvice;9

10

/** */
/** 11
* @author dragon12
*13
*/
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public
class
BeforeAdvice
implements
MethodBeforeAdvice
{15

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public void before(Method method,Object[] args, Object target)17

throws Throwable
{18
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System.out.println( " 这是BeforeAdvice类的before方法. " );20
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} 22
}
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后置通知:AfterAdvice.java
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/** */
/**
2
*
3
*/
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package
com.dragon.Advice;
5
6
import
java.lang.reflect.Method;
7
8
import
org.springframework.aop.AfterReturningAdvice;
9
10
/** */
/**
11
* @author dragon
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*
13
*/
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public
class
AfterAdvice
implements
AfterReturningAdvice
{
15
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public void afterReturning(Object returnValue ,Method method,
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Object[] args,Object target) throws Throwable
{
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System.out.println("这是AfterAdvice类的afterReturning方法.");
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}
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}
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/** */
/**2
* 3
*/
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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
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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

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}
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环绕通知:CompareInterceptor.java
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/** */
/**
2
*
3
*/
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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
*/
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public
class
CompareInterceptor
implements
MethodInterceptor
{
15
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public Object invoke(MethodInvocation invocation) throws Throwable
{
17
Object result = null;
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String stu_name = invocation.getArguments()[0].toString();
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if ( stu_name.equals("dragon"))
{
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//如果学生是dragon时,执行目标方法,
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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
}
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return result;
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}
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}
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/** */
/**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
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return result;28
}29
}
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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
/** */
/**2
* 3
*/
4
package
com;5

6
本文提供了一个简单的Spring AOP示例,介绍了如何配置前置通知、后置通知和环绕通知,并通过具体的代码实现展示了如何将这些通知应用于目标对象的方法调用。
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