AOP annotation implementation
One, in the implementation class of the interface
Add @Component//The target object is loaded into the container before the implementation class
/*接口*/
public interface ICalculate
{
int add(int a,int b);
int sub(int a,int b);
int multi(int a,int b);
int div(int a,int b);
int mod(int a,int b);
}
/*实现类*/
@Component//目标对象
public class CalculateImpl implements ICalculate
{
public int add(int a, int b)
{
System.out.println("a+b");
return a+b;
}
public int sub(int a, int b)
{
System.out.println("a-b");
return a-b;
}
@Override
public int multi(int a, int b)
{
System.out.println("a*b");
return a*b;
}
@Override
public int div(int a, int b)
{
if(b==0)
{
throw new IllegalArgumentException("除数不能为0");
}
System.out.println("a/b");
return a/b;
}
@Override
public int mod(int a, int b)
{
System.out.println("a%b");
return a%b;
}
}
2. Operations in the configuration file
Turn on AspectJ, which is a popular AOP open source framework
<aop:aspectj-autoproxy/>
Configure package scanning base-package: the package containing the annotation class
<context:component-scan base-package="com.study.proxy"></context:component-scan>
<?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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util-4.0.xsd
http://code.alibabatech.com/schema/dubbo
http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
<aop:aspectj-autoproxy/>
<!-- 配置包扫描 base-package:包含注解的类所在的包-->
<context:component-scan base-package="com.study.proxy"></context:component-scan>
</beans>
Three, interceptor settings
Add @Aspect before the class to define an aspect
Add @Component//Interceptor to load into the container
Set before method
//Pre-notification: execute before the target method is executed, intercept the add() method
@Before("execution (* com.study.proxy.CalculateImpl.add(..))")
//Post notification: execute after the target method is executed, intercept the sub() method, and get the return value of the target method
@AfterReturning(pointcut="execution (* com.study.proxy.CalculateImpl.sub(..))",returning="result")
//Final notice: After the target method is executed, the mutli() method is intercepted and the return value cannot be obtained
@After("execution (* com.study.proxy.CalculateImpl.multi(..))")
//Surround notification: The target method can be executed before and after execution, and it can also control whether to call the target method, and modify the return value of the target method
@Around("execution (* com.study.proxy.CalculateImpl.mod(..))")
//Exception notification: enter when the target method throws an exception
@AfterThrowing(pointcut="execution (* com.study.proxy.CalculateImpl.div(..))",throwing="ex")
@Aspect
@Component//拦截器
public class Inteceptor
{
//前置通知:目标方法执行前执行,拦截add()方法
@Before("execution (* com.study.proxy.CalculateImpl.add(..))")
public void deBeforeMethod()
{
System.out.println("前置通知在目标方法执行前执行");
}
//后置通知:目标方法执行后执行，拦截sub()方法,可以获取目标方法的返回值
@AfterReturning(pointcut="execution (* com.study.proxy.CalculateImpl.sub(..))",returning="result")
public void afterReturning(int result)
{
System.out.println("目标方法的返回值:"+result);
System.out.println("后置通知 在目标方法执行 后 执行");
}
//最终通知:目标方法执行后执行，拦截mutli()方法，无法获取返回值
@After("execution (* com.study.proxy.CalculateImpl.multi(..))")
public void finalMethod()
{
System.out.println("最终通知 在目标方法执行 后 执行，无法获取返回值");
}
//环绕通知:目标方法执行前后都可以执行，还能控制是否调用目标方法，还可以修改目标方法的返回值
@Around("execution (* com.study.proxy.CalculateImpl.mod(..))")
public Object aroundMethod(ProceedingJoinPoint pjp) throws Throwable
{
Object returnVal = null;
Object[] params = pjp.getArgs();//获取目标方法的参数
if(params!=null)
{
for (Object object : params)
{
System.out.println(object);
}
}
System.out.println("目标方法执行前执行");
returnVal = pjp.proceed();//调用目标对象的目标方法
System.out.println("目标方法执行后执行");
return (Integer)returnVal*10;//修改返回值
}
//异常通知:当目标方法抛出异常时进入
@AfterThrowing(pointcut="execution (* com.study.proxy.CalculateImpl.div(..))",throwing="ex")
public void afterThrowing(Exception ex)
{
System.out.println(ex);
}
}
Four, test category
Load spring configuration file
ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
Get the object of the interface
ICalculate cal = (ICalculate) context.getBean("calculateImpl");
Object call method
cal.add(10, 20)
public class ServiceTest
{
@Test
public void testService1() throws Exception
{
ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
ICalculate cal = (ICalculate) context.getBean("calculateImpl");
System.out.println(cal.add(10, 20));
}
@Test
public void testService2() throws Exception
{
ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
ICalculate cal = (ICalculate) context.getBean("calculateImpl");
System.out.println(cal.sub(10, 20));
}
@Test
public void testService3() throws Exception
{
ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
ICalculate cal = (ICalculate) context.getBean("calculateImpl");
System.out.println(cal.multi(10, 20));
}
@Test
public void testService4() throws Exception
{
ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
ICalculate cal = (ICalculate) context.getBean("calculateImpl");
System.out.println(cal.mod(10, 20));
}
@Test
public void testService5() throws Exception
{
ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
ICalculate cal = (ICalculate) context.getBean("calculateImpl");
System.out.println(cal.div(10, 0));
}
}
5. I use the maven project, so I need to get the jar package. The following is the pom.xml file configuration
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.zhupeng</groupId>
<artifactId>springaopannotation</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<spring.vesion>4.3.2.RELEASE</spring.vesion>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.2</version>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>javax.servlet.jsp-api</artifactId>
<version>2.3.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.8</version>
<exclusions>
<exclusion>
<artifactId>log4j</artifactId>
<groupId>log4j</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<version>2.5.3</version>
<exclusions>
<exclusion>
<artifactId>spring</artifactId>
<groupId>org.springframework</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.javassist</groupId>
<artifactId>javassist</artifactId>
<version>3.20.0-GA</version>
</dependency>
<dependency>
<groupId>com.101tec</groupId>
<artifactId>zkclient</artifactId>
<version>0.9</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.6.9</version>
</dependency>
<dependency>
<groupId>commons-pool</groupId>
<artifactId>commons-pool</artifactId>
<version>1.5.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-dbcp2 -->
<!-- https://mvnrepository.com/artifact/commons-dbcp/commons-dbcp -->
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>commons-collections</groupId>
<artifactId>commons-collections</artifactId>
<version>3.2</version>
</dependency>
<dependency>
<groupId>commons-httpclient</groupId>
<artifactId>commons-httpclient</artifactId>
<version>3.1</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.vesion}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.vesion}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.vesion}</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-tx -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.vesion}</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/org.springframework.jdbc -->
<!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.vesion}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-instrument-tomcat</artifactId>
<version>${spring.vesion}</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.5</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
</dependencies>
<build>
<finalName>springaopannotation</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
</plugins>
</build>
</project>Six, finally look at the project structure
Hope to help you, I have just learned this one, and then I will update my summary!