Spring AOP Annotation实现

编程语言 2018-05-12 08:57:43 阅读次数: 2

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Project Directory

Maven Dependency

<?xml version="1.0" encoding="UTF-8"?>
<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/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>org.fool.springaop</groupId>
	<artifactId>springaop</artifactId>
	<name>springaop</name>
	<packaging>war</packaging>
	<version>1.0.0-BUILD-SNAPSHOT</version>
	<properties>
		<org.springframework-version>4.2.8.RELEASE</org.springframework-version>
	</properties>
	<dependencies>
		<!-- Spring -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>${org.springframework-version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>${org.springframework-version}</version>
		</dependency>

		<dependency>
			<groupId>org.aspectj</groupId>
			<artifactId>aspectjweaver</artifactId>
			<version>1.8.9</version>
		</dependency>

		<dependency>
			<groupId>org.aspectj</groupId>
			<artifactId>aspectjrt</artifactId>
			<version>1.8.9</version>
		</dependency>

		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-databind</artifactId>
			<version>2.8.1</version>
		</dependency>

		<dependency>
			<groupId>com.google.guava</groupId>
			<artifactId>guava</artifactId>
			<version>19.0</version>
		</dependency>

		<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-lang3</artifactId>
			<version>3.4</version>
		</dependency>

		<!-- @Inject -->
		<dependency>
			<groupId>javax.inject</groupId>
			<artifactId>javax.inject</artifactId>
			<version>1</version>
		</dependency>

		<!-- Servlet -->
		<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>javax.servlet</groupId>
			<artifactId>jstl</artifactId>
			<version>1.2</version>
		</dependency>

		<!-- Test -->
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.12</version>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-eclipse-plugin</artifactId>
				<version>2.10</version>
				<configuration>
					<additionalProjectnatures>
						<projectnature>org.springframework.ide.eclipse.core.springnature</projectnature>
					</additionalProjectnatures>
					<additionalBuildcommands>
						<buildcommand>org.springframework.ide.eclipse.core.springbuilder</buildcommand>
					</additionalBuildcommands>
					<downloadSources>true</downloadSources>
					<downloadJavadocs>true</downloadJavadocs>
				</configuration>
			</plugin>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.5.1</version>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
					<compilerArgument>-Xlint:all</compilerArgument>
					<showWarnings>true</showWarnings>
					<showDeprecation>true</showDeprecation>
				</configuration>
			</plugin>
			<plugin>
				<groupId>org.eclipse.jetty</groupId>
				<artifactId>jetty-maven-plugin</artifactId>
				<version>9.3.11.v20160721</version>
				<configuration>
					<scanIntervalSeconds>10</scanIntervalSeconds>
					<httpConnector>
						<port>8888</port>
					</httpConnector>
					<webApp>
						<contextPath>/springaop</contextPath>
					</webApp>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
	id="WebApp_ID" version="3.0">

	<!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>/WEB-INF/spring/root-context.xml</param-value>
	</context-param>

	<!-- Creates the Spring Container shared by all Servlets and Filters -->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>

	<!-- Processes application requests -->
	<servlet>
		<servlet-name>appServlet</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>

	<servlet-mapping>
		<servlet-name>appServlet</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>

</web-app>

root-context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
	
	<!-- Root Context: defines shared resources visible to all other web components -->
		
</beans>

servlet-context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:beans="http://www.springframework.org/schema/beans" xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
		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/context http://www.springframework.org/schema/context/spring-context.xsd">

	<!-- DispatcherServlet Context: defines this servlet's request-processing infrastructure -->

	<!-- Enables Spring AOP -->
	<aop:aspectj-autoproxy />

	<!-- Enables the Spring MVC @Controller programming model -->
	<annotation-driven />

	<!-- Handles HTTP GET requests for /resources/** by efficiently serving up static resources in the ${webappRoot}/resources 
		directory -->
	<resources mapping="/resources/**" location="/resources/" />

	<!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory -->
	<beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<beans:property name="prefix" value="/WEB-INF/views/" />
		<beans:property name="suffix" value=".jsp" />
	</beans:bean>

	<context:component-scan base-package="org.fool.springaop" />

</beans:beans>

IUserService.java

package org.fool.springaop.service;

public interface IUserService {
	void addUser();
	
	String addUserReturnValue();
	
	void addUserThrowException() throws Exception;
	
	void addUserAround(String name);
}

UserService.java

package org.fool.springaop.service.impl;

import org.fool.springaop.service.IUserService;
import org.springframework.stereotype.Service;

@Service
public class UserService implements IUserService {

	@Override
	public void addUser() {
		System.out.println("addUser() invoked...");
	}

	@Override
	public String addUserReturnValue() {
		System.out.println("addUserReturnValue() invoked...");
		return "200";
	}

	@Override
	public void addUserThrowException() throws Exception {
		System.out.println("addUserThrowException() invoked...");
		throw new Exception();
	}

	@Override
	public void addUserAround(String name) {
		System.out.println("addUserAround() invoked..., args: " + name);
	}

}

LoggingAspect.java

package org.fool.springaop.aspect;

import java.util.Arrays;
import java.util.Date;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.stereotype.Component;

@Component
@Aspect
public class LoggingAspect {
	
	@Before("execution(* org.fool.springaop.service.IUserService.addUser(..))")
	public void logBefore(JoinPoint joinPoint) {
		System.out.println("@Before invoked!!!");
		System.out.println("@Before: " + joinPoint.getSignature().getName());
		System.out.println("******");
	}
	
	@After("execution(* org.fool.springaop.service.IUserService.addUser(..))")
	public void logAfter(JoinPoint joinPoint) {
		System.out.println("@After invoked!!!");
		System.out.println("@After: " + joinPoint.getSignature().getName());
		System.out.println("******");
	}
	
	@AfterReturning(value="execution(* org.fool.springaop.service.IUserService.addUserReturnValue(..))", returning="result")
	public void logAfterReturning(JoinPoint joinPoint, Object result) {
		System.out.println("@AfterReturning invoked!!!");
		System.out.println("@AfterReturning: " + joinPoint.getSignature().getName());
		System.out.println("@AfterRetruning method returned value is: " + result);
		System.out.println("******");
	}
	
	/*
	 * 1.环绕方法通知，环绕方法通知要注意必须给出调用之后的返回值，否则被代理的方法会停止调用并返回null，除非你真的打算这么做。 
     * 2.只有环绕通知才可以使用JoinPoint的子类ProceedingJoinPoint，各连接点类型可以调用代理的方法，并获取、改变返回值。 
	 */
	@Around("execution(* org.fool.springaop.service.IUserService.addUserAround(..))")
	public Object logAround(ProceedingJoinPoint joinPoint) throws Throwable {
		System.out.println("@Around start: " + new Date());
		System.out.println("@Around: " + joinPoint.getSignature().getName());
		System.out.println("@Around argument: " + Arrays.toString(joinPoint.getArgs()));
		
		Object obj = joinPoint.proceed(joinPoint.getArgs());
		
		System.out.println("@Around end: " + new Date());
		System.out.println("******");
		
		return obj;
	}
	
	@AfterThrowing(value="execution(* org.fool.springaop.service.IUserService.addUserThrowException(..))", throwing="ex")
	public void logAfterThrowing(JoinPoint joinPoint, Throwable ex) {
		System.out.println("@AfterThrowing invoked!!!");
		System.out.println("@AfterThrowing: " + joinPoint.getSignature().getName());
		System.out.println("@AfterThrowing exception: " + ex);
		System.out.println("******");
	}
	
}

AopTest.java

package org.fool.springaop.test;

import org.fool.springaop.service.IUserService;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;

public class AopTest {

	private AbstractApplicationContext ctx;
	private IUserService userService;

	@Before
	public void setUp() throws Exception {
		ctx = new FileSystemXmlApplicationContext("/src/main/webapp/WEB-INF/spring/appServlet/servlet-context.xml");
		userService = ctx.getBean(IUserService.class);
	}
	
	@After
	public void tearDown() throws Exception {
		ctx.close();
	}

	@Test
	public void testBeforeAndAfter() throws Exception {
		userService.addUser();
	}

	@Test
	public void testAfterReturning() throws Exception {
		userService.addUserReturnValue();
	}

	@Test
	public void testAround() throws Exception {
		userService.addUserAround("Around Advice");
	}

	@Test
	public void testAfterThrowing() throws Exception {
		userService.addUserThrowException();
	}

}

Test

testBeforeAndAfter


 

testAfterReturning

testAround

testAfterThrowing


 


 

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