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  • AOP实现方法

    原文地址

    http://michael-softtech.iteye.com/blog/650779

    (1)使用ProxyFactoryBean的代理

    Java代码

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    1. package chapter4;

    2. public interface Performable {

    3. public void perform() throws Exception;

    4. }

    5. package chapter4;

    6. import java.util.Random;

    7. public class Artist implements Performable {

    8. public void perform() throws Exception {

    9. int num = new Random().nextInt(100);

    10. if(num >= 50) {

    11. throw new Exception(String.valueOf(num));

    12. } else {

    13. System.out.println(num);

    14. }

    15. }

    16. }

    17. package chapter4;

    18. public class Audience {

    19. public Audience() {

    20. }

    21. public void takeSeats() {

    22. System.out.println("The audience is taking their seats.");

    23. }

    24. public void turnOffCellPhones() {

    25. System.out.println("The audience is turning off " + "their cellphones");

    26. }

    27. public void applaud() {

    28. System.out.println("CLAP CLAP CLAP CLAP CLAP");

    29. }

    30. public void demandRefund() {

    31. System.out.println("Boo! We want our money back!");

    32. }

    33. }

    34. package chapter4;

    35. import java.lang.reflect.Method;

    36. import org.springframework.aop.AfterReturningAdvice;

    37. import org.springframework.aop.MethodBeforeAdvice;

    38. import org.springframework.aop.ThrowsAdvice;

    39. public class AudienceAdvice

    40. implements MethodBeforeAdvice, AfterReturningAdvice, ThrowsAdvice {

    41. private Audience audience;

    42. public void setAudience(Audience audience) {

    43. this.audience = audience;

    44. }

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

    46. throws Throwable {

    47. audience.takeSeats();

    48. audience.turnOffCellPhones();

    49. }

    50. public void afterReturning(Object returnValue, Method method, Object[] args,

    51. Object target) throws Throwable {

    52. audience.applaud();

    53. }

    54. public void afterThrowing(Exception ex) {

    55. audience.demandRefund();

    56. }

    57. }

    Xml代码

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    1. <?xml version="1.0" encoding="UTF-8"?>

    2. <beans xmlns="http://www.springframework.org/schema/beans"

    3. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    4. xmlns:aop="http://www.springframework.org/schema/aop"

    5. xmlns:tx="http://www.springframework.org/schema/tx"

    6. xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    7. <bean id="audience" class="chapter4.Audience" />

    8. <bean id="audienceAdvice" class="chapter4.AudienceAdvice" >

    9. <property name="audience" ref="audience" />

    10. </bean>

    11. <bean id="audienceAdvisor" class="org.springframework.aop.aspectj.AspectJExpressionPointcu

      tAdvisor">

    12. <property name="advice" ref="audienceAdvice" />

    13. <property name="expression" value="execution(* *.perform(..))" />

    14. </bean>

    15. <bean id="artistTarget" class="chapter4.Artist" />

    16. <bean id="artist" class="org.springframework.aop.framework.ProxyFactoryBean" >

    17. <property name="target" ref="artistTarget" />

    18. <property name="interceptorNames" value="audienceAdvisor" />

    19. <property name="proxyInterfaces" value="chapter4.Performable" />

    20. </bean>

    21. </beans>

    (2)隐式使用ProxyFactoryBean的aop代理

    DefaultAdvisorAutoProxyCreator实现了BeanPostProcessor，它将自动检查advisor的pointcut是否匹配bean的方法，如果匹配会替换bean为一个proxy，并且应用其advice。

    Xml代码

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    1. <?xml version="1.0" encoding="UTF-8"?>

    2. <beans xmlns="http://www.springframework.org/schema/beans"

    3. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    4. xmlns:aop="http://www.springframework.org/schema/aop"

    5. xmlns:tx="http://www.springframework.org/schema/tx"

    6. xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    7. <bean class="org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyC

      reator" />

    8. <bean id="audience" class="chapter4.Audience" />

    9. <bean id="audienceAdvice" class="chapter4.AudienceAdvice" >

    10. <property name="audience" ref="audience" />

    11. </bean>

    12. <bean id="audienceAdvisor" class="org.springframework.aop.aspectj.AspectJExpressionPointcu

      tAdvisor">

    13. <property name="advice" ref="audienceAdvice" />

    14. <property name="expression" value="execution(* *.perform(..))" />

    15. </bean>

    16. <bean id="artist" class="chapter4.Artist" />

    17. </beans>

    (3)使用注解的aop代理

    xml中增加了一个<aop:aspectj-autoproxy />，它创建了AnnotationAwareAspectJAutoProxyCreator在spring中，这个类将自动代理匹配的类的放方法。和上个例子中DefaultAdvisorAutoProxyCreator做同样的工作。

    Java代码

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    1. package chapter4;

    2. import org.aspectj.lang.annotation.AfterReturning;

    3. import org.aspectj.lang.annotation.AfterThrowing;

    4. import org.aspectj.lang.annotation.Aspect;

    5. import org.aspectj.lang.annotation.Before;

    6. import org.aspectj.lang.annotation.Pointcut;

    7. @Aspect

    8. public class Audience {

    9. public Audience() {

    10. }

    11. @Pointcut("execution(* *.perform(..))")

    12. public void pointcut(){}

    13. @Before("pointcut()")

    14. public void takeSeats() {

    15. System.out.println("The audience is taking their seats.");

    16. }

    17. @Before("pointcut()")

    18. public void turnOffCellPhones() {

    19. System.out.println("The audience is turning off " + "their cellphones");

    20. }

    21. @AfterReturning("pointcut()")

    22. public void applaud() {

    23. System.out.println("CLAP CLAP CLAP CLAP CLAP");

    24. }

    25. @AfterThrowing("pointcut()")

    26. public void demandRefund() {

    27. System.out.println("Boo! We want our money back!");

    28. }

    29. }

    Xml代码

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    1. <?xml version="1.0" encoding="UTF-8"?>

    2. <beans xmlns="http://www.springframework.org/schema/beans"

    3. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    4. xmlns:aop="http://www.springframework.org/schema/aop"

    5. xmlns:tx="http://www.springframework.org/schema/tx"

    6. xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    7. <aop:aspectj-autoproxy />

    8. <bean id="audience" class="chapter4.Audience" />

    9. <bean id="artist" class="chapter4.Artist" />

    10. </beans>

    (4)使用aop配置文件的自动代理

    采用这种方法，不用加<aop:aspectj-autoproxy />

    Java代码

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    1. package chapter4;

    2. import org.aspectj.lang.annotation.Aspect;

    3. @Aspect

    4. public class Audience {

    5. public Audience() {

    6. }

    7. public void pointcut() {

    8. }

    9. public void takeSeats() {

    10. System.out.println("The audience is taking their seats.");

    11. }

    12. public void turnOffCellPhones() {

    13. System.out.println("The audience is turning off " + "their cellphones");

    14. }

    15. public void applaud() {

    16. System.out.println("CLAP CLAP CLAP CLAP CLAP");

    17. }

    18. public void demandRefund() {

    19. System.out.println("Boo! We want our money back!");

    20. }

    21. }

    Xml代码

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    1. <?xml version="1.0" encoding="UTF-8"?>

    2. <beans xmlns="http://www.springframework.org/schema/beans"

    3. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    4. xmlns:aop="http://www.springframework.org/schema/aop"

    5. xmlns:tx="http://www.springframework.org/schema/tx"

    6. xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    7. <bean id="audience" class="chapter4.Audience" />

    8. <aop:config>

    9. <aop:aspect ref="audience">

    10. <aop:before method="takeSeats" pointcut="execution(* *.perform(..))" />

    11. <aop:before method="turnOffCellPhones" pointcut="execution(* *.perform(..))" />

    12. <aop:after-returning method="applaud" pointcut="execution(* *.perform(..))" />

    13. <aop:after-throwing method="demandRefund" pointcut="execution(* *.perform(..))" />

    14. </aop:aspect>

    15. </aop:config>

    16. <bean id="artist" class="chapter4.Artist" />

    17. </beans>
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  • 原文地址：https://www.cnblogs.com/wzyxidian/p/5157924.html
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