如何利用aop的环绕消息处理log, 以及各种坑的记录

本文链接: https://www.cnblogs.com/zizaiwuyou/p/11667423.html

因为项目里有很多地方要打log, 所以决定改为AOP统一处理, 好不容易整好了, 特此记录一下:

一, 新建项目, 添加注解类和切面类

pom.xml文件如下:

<?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.jhyx</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>项目名</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </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>

        <!-- aop dependency -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>

        <!-- web starter dependency -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- spring boot start denpendency -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!-- slf4j log dependency -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
        </dependency>

        <!-- json dependency -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>LATEST</version>
        </dependency>

        <!-- test dependency -->
        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-all</artifactId>
            <version>LATEST</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-core</artifactId>
            <version>LATEST</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-api-mockito</artifactId>
            <version>LATEST</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-module-testng</artifactId>
            <version>1.7.0</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </pluginRepository>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>

</project>

注解类内容如下:

package com.xxx.common.log;

import org.springframework.stereotype.Component;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 *  TYPE ->  Class, interface (including annotation type), or enum declaration
 *  METHOD ->  Method declaration
 */
@Target({ElementType.METHOD,ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface Log {

    String value() default "";

    boolean ignore() default false;
}

切面类如下:

package com.xxx.common.log;

import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.serializer.SerializerFeature;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;

/**
 * Log 注解类实现
 */
@Aspect
@Order(100)
@Component
public class LogAspect {

    public static final Logger log =  LoggerFactory.getLogger(LogAspect.class);
    public static final String dateformat = "yyyy:MM:dd HH:mm:ss";
    public static final String STIRNG_START = "\n<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<";
    public static final String STIRNG_END = "\n>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>";
//    execution the scan of pakage 切点package
    @Pointcut("execution( * com.qingniu.qfpay.rvwbackend.controller..*(..)) || execution( * com.qingniu.qfpay.rvwbackend.service..*(..))")
    public void serviceLog(){

    }

    @Around("serviceLog()")
    public Object around(ProceedingJoinPoint joinPoint) { // ProceedingJoinPoint 为JoinPoint 的子类，在父类基础上多了proceed()方法，用于增强切面
        try {
            // 获取方法签名
            MethodSignature signature = (MethodSignature) joinPoint.getSignature();
            //java reflect相关类，通过反射得到注解
            Method method = signature.getMethod();
            Class<?> targetClass = method.getDeclaringClass();

            StringBuffer classAndMethod = new StringBuffer();

            //获取类注解Log
            Log classAnnotation = targetClass.getAnnotation(Log.class);
            //获取方法注解Log
            Log methodAnnotation = method.getAnnotation(Log.class);

            //如果类上Log注解不为空，则执行proceed()
            if (classAnnotation != null) {
                if (classAnnotation.ignore()) {
                    //proceed() 方法执行切面方法，并返回方法返回值
                    return joinPoint.proceed();
                }
                classAndMethod.append(classAnnotation.value()).append("-");
            }

            //如果方法上Log注解不为空，则执行proceed()
            if (methodAnnotation != null) {
                if (methodAnnotation.ignore()) {
                    return joinPoint.proceed();
                }
                classAndMethod.append(methodAnnotation.value());
            }

            //拼凑目标类名和参数名
            String target = targetClass.getName() + "#" + method.getName();
            String params = JSONObject.toJSONStringWithDateFormat(joinPoint.getArgs(), dateformat, SerializerFeature.WriteMapNullValue);

            log.info(STIRNG_START + "{} 开始调用--> {} 参数:{}", classAndMethod.toString(), target, params);

            long start = System.currentTimeMillis();
            //如果类名上和方法上都没有Log注解，则直接执行 proceed()
            Object result = joinPoint.proceed();
            long timeConsuming = System.currentTimeMillis() - start;

//            log.info("\n{} 调用结束<-- {} 返回值:{} 耗时:{}ms" + STIRNG_END, classAndMethod.toString(), target, JSONObject.toJSONStringWithDateFormat(result, dateformat, SerializerFeature.WriteMapNullValue), timeConsuming);
            log.info("\n{} 调用结束<-- {}  耗时:{}ms" + STIRNG_END, classAndMethod.toString(), target, timeConsuming);
            return result;
        } catch (Throwable throwable) {
            log.error("调用异常", throwable.getMessage(), throwable);
        }
        return null;
    }
}

踩坑:@Pointcut("execution( * com.qingniu.qfpay.rvwbackend.controller..*(..)) || execution( * com.qingniu.qfpay.rvwbackend.service..*(..))")

设置execution表达式的具体详情请参考https://blog.csdn.net/yangshangwei/article/details/77627825

@Around("serviceLog()")定义的是触发时机, 通过一个空的方法来转换, 这种方式可以写多个环绕消息, 示例中只写了一个

二,导出JAR包

在eclipse中, 右键项目, Export- > JAR File

踩坑:

图中的这一项必须勾选, 不然无法被springBoot扫描

三, 在需要使用log的项目中导入jar包

我使用的是gradle, builde.gradle文件中加入下列配置

然后在项目根目录加一个libs文件夹, 把jar放进去

修改项目启动文件:

package com.qingniu.qfpay.rvwbackend;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Import;

@SpringBootApplication(exclude = SecurityAutoConfiguration.class)
@Import(AppConfig.class)
@ComponentScan(basePackages = {"com.qingniu.qfpay.rvwbackend, com.xxx.common.log"})
public class App {
    public static void main(final String[] args) {
        SpringApplication.run(App.class, args);
    }
}

　　踩坑:这里的@ComponentScan配置,如果不声明, spring默认是扫描当前文件层级以及子孙级,但是如果声明的话, 就全按照声明的路径扫描, 所以要加上当前路径

四, 启动项目,

所有controller和service包下的类中的方法都会打印进出log, 如果要log入库, 在切面类中自定义操作就行了, 注解的作用在于定制化打印log, 可以按照自己的使用需求, 更改代码

参考资料:

https://my.oschina.net/xiaomingnevermind/blog/1619274

https://blog.csdn.net/d_ohko/article/details/78962458

https://blog.csdn.net/yangshangwei/article/details/77627825

https://www.cnblogs.com/cac2020/p/9216509.html

原文地址：https://www.cnblogs.com/zizaiwuyou/p/11667423.html