在软件业，AOP为Aspect Oriented Programming的缩写，意为：面向切面编程，通过预编译方式和运行期间动态代理实现程序功能的统一维护的一种技术。AOP是OOP的延续，是软件开发中的一个热点，也是Spring框架中的一个重要内容，是函数式编程的一种衍生范型。利用AOP可以对业务逻辑的各个部分进行隔离，从而使得业务逻辑各部分之间的耦合度降低，提高程序的可重用性，同时提高了开发的效率。

package com.programb;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class Application {public static void main(String[] args) {SpringApplication.run(Application.class, args);}}

package com.programb.aop;import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.CommandLineRunner;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;@Component
@Order(1)
public class AfterStartRunner implements CommandLineRunner {private Logger logger = LoggerFactory.getLogger(this.getClass());public void run(String... args) {logger.debug("after start debug...");logger.info("after start info...");}
}

package com.programb.aop.aspect;import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;import javax.servlet.http.HttpServletRequest;
import java.util.Arrays;/*** 日志切面*/
@Aspect
@Component
public class LogAspect {@Pointcut("execution(public * com.xncoding.aop.controller.*.*(..))")public void webLog(){}@Before("webLog()")public void deBefore(JoinPoint joinPoint) throws Throwable {// 接收到请求，记录请求内容ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();HttpServletRequest request = attributes.getRequest();// 记录下请求内容System.out.println("URL : " + request.getRequestURL().toString());System.out.println("HTTP_METHOD : " + request.getMethod());System.out.println("IP : " + request.getRemoteAddr());System.out.println("CLASS_METHOD : " + joinPoint.getSignature().getDeclaringTypeName() + "." + joinPoint.getSignature().getName());System.out.println("ARGS : " + Arrays.toString(joinPoint.getArgs()));}@AfterReturning(returning = "ret", pointcut = "webLog()")public void doAfterReturning(Object ret) throws Throwable {// 处理完请求，返回内容System.out.println("方法的返回值 : " + ret);}//后置异常通知@AfterThrowing("webLog()")public void throwss(JoinPoint jp){System.out.println("方法异常时执行.....");}//后置最终通知,final增强，不管是抛出异常或者正常退出都会执行@After("webLog()")public void after(JoinPoint jp){System.out.println("方法最后执行.....");}//环绕通知,环绕增强，相当于MethodInterceptor@Around("webLog()")public Object arround(ProceedingJoinPoint pjp) {System.out.println("方法环绕start.....");try {Object o =  pjp.proceed();System.out.println("方法环绕proceed，结果是 :" + o);return o;} catch (Throwable e) {e.printStackTrace();return null;}}
}

package com.programb.aop.aspect;import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface UserAccess {String desc() default "无信息";
}

package com.programb.aop.aspect;import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;@Component
@Aspect
public class UserAccessAspect {@Pointcut(value = "@annotation(com.xncoding.aop.aspect.UserAccess)")public void access() {}@Before("access()")public void deBefore(JoinPoint joinPoint) throws Throwable {System.out.println("second before");}@Around("@annotation(userAccess)")public Object around(ProceedingJoinPoint pjp, UserAccess userAccess) {//获取注解里的值System.out.println("second around:" + userAccess.desc());try {return pjp.proceed();} catch (Throwable throwable) {throwable.printStackTrace();return null;}}
}

package com.programb.aop.controller;import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.programb.aop.aspect.UserAccess;@RestController
public class UserController {@RequestMapping("/first")public Object first() {return "first controller";}@RequestMapping("/doError")public Object error() {return 1 / 0;}@RequestMapping("/second")@UserAccess(desc = "second")public Object second() {return "second controller";}}

server.port: 8092
spring:profiles:active: dev
spring:profiles: dev
logging:level:root: INFOcom.xncoding: DEBUGpath: D:/programb/springboot-programb-aop

<?xml version="1.0" encoding="UTF-8"?>
<!-- scan 配置文件如果发生改变，将会被重新加载  scanPeriod 检测间隔时间-->
<configuration scan="true" scanPeriod="60 seconds" debug="false"><contextName>logback</contextName><include resource="org/springframework/boot/logging/logback/base.xml"/><!-- 日志存储级别 --><springProperty scope="context" name="rootlevel" source="logging.level.root" /><springProperty scope="context" name="busilevel" source="logging.level.com.xncoding" /><!-- 日志存储路径 --><springProperty scope="context" name="logPath" source="logging.path" /><!-- 普通日志 --><appender name="INFO_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"><file>${logPath}/info.log</file><!-- 循环政策：基于时间创建日志文件 --><rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"><!-- 日志命名:单个文件大于128MB 按照时间+自增i 生成log文件 --><fileNamePattern>${logPath}/info-%d{yyyy-MM-dd}.%i.log</fileNamePattern><timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP"><maxFileSize>128MB</maxFileSize></timeBasedFileNamingAndTriggeringPolicy><!-- 最大保存时间：30天--><maxHistory>30</maxHistory></rollingPolicy><append>true</append><encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder"><pattern>%d{yyyy-MM-dd HH:mm:ss.SSS}  %p ${PID:-} --- [%15thread] %logger:%-3L : %msg%n</pattern><charset>utf-8</charset></encoder><filter class="ch.qos.logback.classic.filter.LevelFilter"><level>info</level><onMatch>ACCEPT</onMatch><onMismatch>DENY</onMismatch></filter></appender><!-- 错误日志 --><appender name="ERROR_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"><file>${logPath}/error.log</file><!-- 循环政策：基于时间创建日志文件 --><rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"><!-- 日志命名:单个文件大于2MB 按照时间+自增i 生成log文件 --><fileNamePattern>${logPath}/error-%d{yyyy-MM-dd}.%i.log</fileNamePattern><timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP"><maxFileSize>2MB</maxFileSize></timeBasedFileNamingAndTriggeringPolicy><!-- 最大保存时间：180天--><maxHistory>180</maxHistory></rollingPolicy><append>true</append><!-- 日志格式 --><encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder"><pattern>%d{yyyy-MM-dd HH:mm:ss.SSS}  %p ${PID:-} --- [%15thread] %logger:%-3L : %msg%n</pattern><charset>utf-8</charset></encoder><!-- 日志级别过滤器 --><filter class="ch.qos.logback.classic.filter.LevelFilter"><!-- 过滤的级别 --><level>ERROR</level><!-- 匹配时的操作：接收（记录） --><onMatch>ACCEPT</onMatch><!-- 不匹配时的操作：拒绝（不记录） --><onMismatch>DENY</onMismatch></filter></appender><!-- 控制台 --><appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"><!-- 日志格式 --><encoder><pattern>%d{yyyy-MM-dd HH:mm:ss.SSS}  %p ${PID:-} --- [%15thread] %logger:%-3L : %msg%n</pattern><charset>utf-8</charset></encoder><!--此日志appender是为开发使用，只配置最底级别，控制台输出的日志级别是大于或等于此级别的日志信息--><filter class="ch.qos.logback.classic.filter.ThresholdFilter"><level>DEBUG</level></filter></appender><!-- 屏蔽kafka的警告 --><logger name="org.apache.kafka" level="ERROR"/><!-- additivity 避免执行2次 --><logger name="com.xncoding" level="${busilevel}" additivity="false"><appender-ref ref="STDOUT"/><appender-ref ref="INFO_FILE"/><appender-ref ref="ERROR_FILE"/></logger><root level="${rootlevel}"><appender-ref ref="INFO_FILE"/><appender-ref ref="ERROR_FILE"/></root>
</configuration>

<?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/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.xncoding</groupId><artifactId>springboot-aop</artifactId><version>1.0.0-SNAPSHOT</version><packaging>jar</packaging><name>springboot-programb-aop</name><description>springboot</description><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.0.4.RELEASE</version></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId><exclusions><exclusion><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-tomcat</artifactId></exclusion></exclusions></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jetty</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-aop</artifactId></dependency></dependencies><build><plugins><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>3.6.1</version><configuration><source>1.8</source><target>1.8</target></configuration></plugin><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-surefire-plugin</artifactId><version>2.20</version><configuration><skip>true</skip></configuration></plugin><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><executions></executions></plugin></plugins></build></project>