SpringBoot切面AOP

1. SpringBoot切面AOP

SpringBoot提供了强大AOP支持，这里补充说明AOP原介绍；
AOP切面主要是切方法，我们一般搞一些日志分析和事务操作，要用到切面，类似拦截器；

@Aspect注解是切面注解类

@Pointcut切点定义

@Before是方法执行前调用

@After是方法执行后调用

@AfterReturning方法执行返回值调用

Service层本身就可以切入事务，所以我们这类搞个常用的 切controller层方法
每个执行controller层的方法 都记录下请求Url，访问者IP 执行类方法参数等信息；

pom.xml

<dependencies>
    <dependency>
        <groupId>apache-log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.15</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-tomcat</artifactId>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-configuration-processor</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-freemarker</artifactId>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
</dependencies>
<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-war-plugin</artifactId>
            <version>2.6</version>
            <configuration>
                <failOnMissingWebXml>false</failOnMissingWebXml>
            </configuration>
        </plugin>
    </plugins>
</build>

src/main/java/com/andrew/aspect/RequestAspect.java

package com.andrew.aspect;
import javax.servlet.http.HttpServletRequest;
import org.apache.log4j.Logger;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import com.andrew.entity.Student;

@Aspect
@Component
public class RequestAspect {
    private static Logger logger = Logger.getLogger(RequestAspect.class);
    @Pointcut("execution(public * com.andrew.controller.*.*(..))")
    public void log() {
    }
    @Before("log()")
    public void doBefore(JoinPoint joinPoint) {
        logger.info("方法执行前...");
        ServletRequestAttributes sra = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = sra.getRequest();
        logger.info("url:" + request.getRequestURI());
        logger.info("ip:" + request.getRemoteHost());
        logger.info("method:" + request.getMethod());
        logger.info("class_method:" + joinPoint.getSignature().getDeclaringTypeName() + "." + joinPoint.getSignature().getName());
        logger.info("args:" + joinPoint.getArgs());
        Student student = (Student) joinPoint.getArgs()[0];
        System.out.println(student);
    }
    @After("log()")
    public void doAfter(JoinPoint joinPoint) {
        logger.info("方法执行后...");
    }
    @AfterReturning(returning = "result", pointcut = "log()")
    public void doAfterReturning(Object result) {
        logger.info("方法返回值：" + result);
    }
}

src/main/resources/log4j.properties

log4j.rootLogger=DEBUG, Console ,File  
  
#Console    
log4j.appender.Console=org.apache.log4j.ConsoleAppender    
log4j.appender.Console.layout=org.apache.log4j.PatternLayout    
log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n

http://localhost:8000/studentAdd.html
d 22 提交
console打印
2018-06-14 23:38:13,085 [http-nio-8000-exec-2] INFO  [com.andrew.aspect.RequestAspect] - 方法执行前...
  2018-06-14 23:38:13,086 [http-nio-8000-exec-2] INFO  [com.andrew.aspect.RequestAspect] - url:/student/add
  2018-06-14 23:38:13,086 [http-nio-8000-exec-2] INFO  [com.andrew.aspect.RequestAspect] - ip:0:0:0:0:0:0:0:1
  2018-06-14 23:38:13,086 [http-nio-8000-exec-2] INFO  [com.andrew.aspect.RequestAspect] - method:POST
  2018-06-14 23:38:13,087 [http-nio-8000-exec-2] INFO  [com.andrew.aspect.RequestAspect] - class_method:com.andrew.controller.StudentController.add
  2018-06-14 23:38:13,087 [http-nio-8000-exec-2] INFO  [com.andrew.aspect.RequestAspect] - args:[Ljava.lang.Object;@46202a02
  Student [id=null, name=d, age=22]
Hibernate: select next_val as id_val from hibernate_sequence for update
Hibernate: update hibernate_sequence set next_val= ? where next_val=?
Hibernate: insert into t_student (age, name, id) values (?, ?, ?)
2018-06-14 23:38:13,368 [http-nio-8000-exec-2] INFO  [com.andrew.aspect.RequestAspect] - 方法执行后...
  2018-06-14 23:38:13,368 [http-nio-8000-exec-2] INFO  [com.andrew.aspect.RequestAspect] - 方法返回值：添加成功