标签:rri expr path start cts ssi rate 还需 ges
Spring AOP
AspectJ:Java社区里最完整最流行的AOP框架
在Spring2.0以上的版本中,可以使用基于AspectJ注解或者基于XML配置的AOP
看代码:
package logan.study.aop.impl; public interface ArithmeticCalculator { int add(int i, int j); int sub(int i, int j); int mul(int i, int j); int div(int i, int j); }
package logan.study.aop.impl; import org.springframework.stereotype.Component; @Component public class ArithmeticCalculatorImpl implements ArithmeticCalculator { @Override public int add(int i, int j) { // TODO Auto-generated method stub int result = i + j; return result; } @Override public int sub(int i, int j) { // TODO Auto-generated method stub int result = i - j; return result; } @Override public int mul(int i, int j) { // TODO Auto-generated method stub int result = i * j; return result; } @Override public int div(int i, int j) { // TODO Auto-generated method stub int result = i / j; return result; } }
package logan.study.aop.impl; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.springframework.stereotype.Component; //把这个类声明为一个切面:需要把该类放入到IOC容器中,在声明为一个切面 @Aspect @Component public class LoggingAspect { //声明该方法时一个前置通知:在目标方法开始之前执行 @Before("execution(public int logan.study.aop.impl.ArithmeticCalculator.add(int, int))") public void beforeMethod(){ System.out.println("The method begins"); } }
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd"> <context:component-scan base-package="logan.study.aop.impl"></context:component-scan> <aop:aspectj-autoproxy></aop:aspectj-autoproxy> </beans>
package logan.study.aop.impl; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Main { public static void main(String[] args) { // TODO Auto-generated method stub //1.创建Spring的IOC容器 ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml"); //2.从IOC容器里面获取bean实例 ArithmeticCalculator arithmeticCalculator = ctx.getBean(ArithmeticCalculator.class); //使用Bean int result = arithmeticCalculator.add(3, 6); System.out.println(result); } }
输出结果:
五月 27, 2017 4:41:38 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh 信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@49c2faae: startup date [Sat May 27 16:41:38 CST 2017]; root of context hierarchy 五月 27, 2017 4:41:39 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions 信息: Loading XML bean definitions from class path resource [applicationContext.xml] The method begins 9
在看代码:
package logan.study.aop.impl; import java.util.Arrays; import java.util.List; import org.aspectj.lang.JoinPoint; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.springframework.stereotype.Component; //把这个类声明为一个切面:需要把该类放入到IOC容器中,在声明为一个切面 @Aspect @Component public class LoggingAspect { //声明该方法时一个前置通知:在目标方法开始之前执行 @Before("execution(public int logan.study.aop.impl.ArithmeticCalculator.add(int, int))") public void beforeMethod(JoinPoint joinPoint){ String methodName = joinPoint.getSignature().getName(); List<Object> args = Arrays.asList(joinPoint.getArgs()); System.out.println("The method "+ methodName +" begins with "+args); } }
输出结果:
五月 27, 2017 5:10:24 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh 信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@49c2faae: startup date [Sat May 27 17:10:24 CST 2017]; root of context hierarchy 五月 27, 2017 5:10:24 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions 信息: Loading XML bean definitions from class path resource [applicationContext.xml] The method add begins with [3, 6] 9
在看代码:
package logan.study.aop.impl; import java.util.Arrays; import java.util.List; import org.aspectj.lang.JoinPoint; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.springframework.stereotype.Component; //把这个类声明为一个切面:需要把该类放入到IOC容器中,在声明为一个切面 @Aspect @Component public class LoggingAspect { //声明该方法时一个前置通知:在目标方法开始之前执行 @Before("execution(public int logan.study.aop.impl.ArithmeticCalculator.*(int, int))") public void beforeMethod(JoinPoint joinPoint){ String methodName = joinPoint.getSignature().getName(); List<Object> args = Arrays.asList(joinPoint.getArgs()); System.out.println("The method "+ methodName +" begins with "+args); } }
package logan.study.aop.impl; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Main { public static void main(String[] args) { // TODO Auto-generated method stub //1.创建Spring的IOC容器 ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml"); //2.从IOC容器里面获取bean实例 ArithmeticCalculator arithmeticCalculator = ctx.getBean(ArithmeticCalculator.class); //使用Bean int result = arithmeticCalculator.add(3, 6); System.out.println(result); result = arithmeticCalculator.div(3, 6); System.out.println(result); } }
输出结果:
五月 27, 2017 5:12:36 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh 信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@49c2faae: startup date [Sat May 27 17:12:36 CST 2017]; root of context hierarchy 五月 27, 2017 5:12:36 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions 信息: Loading XML bean definitions from class path resource [applicationContext.xml] The method add begins with [3, 6] 9 The method div begins with [3, 6] 0
1.SpringAOP
加入jar包:
spring-aop-4.3.8.RELEASE.jar
spring-aspects-4.3.8.RELEASE.jar
spring-beans-4.3.8.RELEASE.jar
spring-context-4.3.8.RELEASE.jar
spring-core-4.3.8.RELEASE.jar
spring-expression-4.3.8.RELEASE.jar
commons-logging-1.2.jar
aspectjrt.jar
aspectjweaver.jar
aopalliance-1.0.jar
aspectj-1.8.10.jar
在配置文件中加入aop的命名空间
基于注解的方式:
在配置文件中加入如下配置:
<aop:aspectj-autoproxy></aop:aspectj-autoproxy>
把横切关注点的代码抽象到切面的类中
切面首先是一个IOC中的Bean,即加入@Component注解
切面还需要加入@Aspect注解
在类中声明各种通知。
AspectJ支持5中类型的通知注解:
-@Before:前置通知,在方法执行之前执行
-@After:后置通知,在方法执行之后通知
-@AfterRunning:返回通知,在方法返回结果之后执行
-@AfterThrowing:异常通知:在方法抛出异常之后
-@Around:环绕通知,围绕着方法执行。
声明一个方法
在方法前加入@Before注解
利用方法签名编写AspectJ切入点表达式
最典型的切入点表达式时根据方法的签名来匹配各种方法:
-execution * logan.aop.ArithmeticCalculator.*(...)匹配ArithmeticCalculator中声明的所有方法,第一个*代表任意修饰符以及任意返回值,第二个*代表任意方法,(...)匹配任意数量的参数,若目标类与接口与切面在同一个包中,可以省略包名。
-execution public * ArithmeticCalculator.*(...):匹配ArithmeticCalculator接口的所有公有方法。
-execution public double ArithmeticCalculator.*(...):匹配ArithmeticCalculator中返回double类型数字的方法。
-execution public double ArithmeticCalculator.*(double,...):匹配ArithmeticCalculator中第一个参数为double类型的,返回double类型数字的方法。
-execution public double ArithmeticCalculator.*(double, double):匹配ArithmeticCalculator中参数类型为(double,double)类型的方法。
标签:rri expr path start cts ssi rate 还需 ges
原文地址:http://www.cnblogs.com/LoganChen/p/6913890.html