利用spring AOP功能进行日志管理

目的，利用aop功能实现日志管理，记录每次方法的调用时间、参数、返回值等信息。

1.pom.xml文件中导入相关依赖

<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>org.study</groupId>
<artifactId>springStudy</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>springStudy</name>
<url>http://maven.apache.org</url>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<spring.version>4.2.5.RELEASE</spring.version>
<log4j.version>1.2.17</log4j.version>
<junit.version>4.12</junit.version>
<jsr.api.version>1.0</jsr.api.version>
<fastjson.version>1.2.11</fastjson.version>
<org.aspectj.version>1.8.9</org.aspectj.version>
</properties>

<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>

</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>${fastjson.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>javax.annotation</groupId>
<artifactId>jsr250-api</artifactId>
<version>${jsr.api.version}</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>${org.aspectj.version}</version>
</dependency>
<!-- junit -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<!--scope>test</scope-->
</dependency>

</dependencies>
</project>

2.建立接口HelloWorld
package org.study.springStudy.aop;

import com.alibaba.fastjson.JSONObject;

public interface HelloWorld {
String printHelloWorld(JSONObject request);
void doPrint();
}3.建立业务类HelloWorldImpl.java
package org.study.springStudy.aop;

import org.springframework.stereotype.Component;

import com.alibaba.fastjson.JSONObject;

@Component("helloWorldImpl")
public class HelloWorldImpl implements HelloWorld{

public String printHelloWorld(JSONObject request)
{
// System.out.println("Enter HelloWorldImpl.printHelloWorld()");
return "return:"+request.toString();
}

public void doPrint()
{
//System.out.println("Enter HelloWorldImpl.doPrint()");
return ;
}

}

4创建用于日志处理的切面类Logging.java
package org.study.springStudy.aop;

import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;
import java.util.List;

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

@Aspect
@Component
public class Logging {

@Around("execution(* org.study.springStudy.aop.HelloWorld.*(..))")
public void doAfter(ProceedingJoinPoint pj)throws Throwable {
String name = pj.getSignature().getName();
String dateBefore = (new SimpleDateFormat("yyyy-MM-dd HH:mm:ss aa")).format(new Date());
List<Object> args = Arrays.asList(pj.getArgs());
System.out.println("被调用的的方法： " + name +" 参数：" + args +" 执行时间："+dateBefore);
Object ob = pj.proceed();
System.out.println("返回值："+ob);
String dateAfter = (new SimpleDateFormat("yyyy-MM-dd HH:mm:ss aa")).format(new Date());
System.out.println("返回时间："+dateAfter);
}
}


5创建一个测试类进行测试
package org.study.springStudy;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.study.springStudy.aop.HelloWorld;

import com.alibaba.fastjson.JSONObject;

public class TestMain {

public static void main(String[] args)
{
ApplicationContext ctx =
new ClassPathXmlApplicationContext("applicationContext.xml");

HelloWorld hw = (HelloWorld)ctx.getBean("helloWorldImpl");
JSONObject request = new JSONObject();
request.put("test", "json");
hw.printHelloWorld(request);

System.out.println();
hw.doPrint();

}
}


执行main方法，输出测试结果如下：

被调用的的方法： printHelloWorld 参数：[{"test":"json"}] 执行时间：2017-10-23 16:33:41 下午

返回值：return:{"test":"json"}

返回时间：2017-10-23 16:33:41 下午

被调用的的方法： doPrint 参数：[] 执行时间：2017-10-23 16:33:41 下午

返回值：null

返回时间：2017-10-23 16:33:41 下午