利用spring AOP功能进行日志管理

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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  @Componentpublic 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

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