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:
4.0.0 com.jhyx demo 0.0.1-SNAPSHOT jar 项目名 Demo project for Spring Boot org.springframework.boot spring-boot-starter-parent 1.5.6.RELEASE UTF-8 UTF-8 1.8 org.springframework.boot spring-boot-starter-aop org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-test test org.slf4j slf4j-api com.alibaba fastjson LATEST org.mockito mockito-all LATEST test org.powermock powermock-core LATEST test org.powermock powermock-api-mockito LATEST test org.powermock powermock-module-testng 1.7.0 test org.springframework.boot spring-boot-maven-plugin spring-snapshots Spring Snapshots https://repo.spring.io/snapshot true spring-milestones Spring Milestones https://repo.spring.io/milestone false spring-snapshots Spring Snapshots https://repo.spring.io/snapshot true spring-milestones Spring Milestones https://repo.spring.io/milestone false
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.controller..*(..)) || execution( * com.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.controller..*(..)) || execution( * com.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.xxx, 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