AspectJ Hello World

一、简介

AspectJ 是一个强大的面向切面编程框架,Spring 等 AOP 全部兼容该框架;它扩展了Java语言。AspectJ 定义了 AOP 语法所以它有一个专门的编译器用来生成遵守Java字节编码规范的Class文件。

二、环境准备

  • IntelliJ IDEA 2016
  • Maven 3.3.9
  • AspectJ 1.8.9
  • aspectjtools 1.8.9

三、Hello World

1、首先新建一个 Java 项目 :

hex_aspect_create_project

2、将其转化为 Maven 项目

hexo_aspect_add_maven

3、加入相关依赖

hexo_aspect_maven_dependencies

POM 如下 :

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<?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>me.mritd</groupId>
<artifactId>Test1</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>


<dependencies>
<!-- https://mvnrepository.com/artifact/org.aspectj/aspectjrt -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>1.8.9</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.aspectj/aspectjtools -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjtools</artifactId>
<version>1.8.9</version>
</dependency>
</dependencies>
<build>
<plugins>
<!-- Maven 编译插件 -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<!-- AspectJ 编译插件 -->
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>aspectj-maven-plugin</artifactId>
<version>1.8</version>
<executions>
<execution>
<goals>
<goal>compile</goal> <!-- use this goal to weave all your main classes -->
<goal>test-compile</goal> <!-- use this goal to weave all your test classes -->
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>

4、创建一个普通类

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package me.mritd.test;

/**
* Created by mritd on 16/6/19.
*/
public class Test1 {

public static void main(String[] args) {
System.out.println("Test AspectJ...");
}

}

5、创建一个切面

创建时选择 AspectJ 程序 :

hexo_aspect_newaspect

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package me.mritd.testaspect;

/**
* Created by mritd on 16/6/19.
*/
public aspect TestAspect {

// 定义 pointcut
pointcut TestAspectPointCutBefore() : execution(* me.mritd.test.Test1.main(..));
pointcut TestAspectPointCutAfter() : execution(* me.mritd.test.Test1.main(..));


// 定义执行动作
before() : TestAspectPointCutBefore(){
System.out.println("执行前切入...");
}

after() : TestAspectPointCutAfter(){
System.out.println("执行前切入...");
}
}

6、调整编译

由于 AspectJ 需要单独的编译器编译,所以需要设置 Ajc 编译器,Maven 中已经加入了相关编译插件,直接 compile 也可以。

6.1、设置项目依赖

hexo_aspect_add_ajc

6.2、设置编译器

hexo_aspect_set_ajc

7、运行测试

hexo_aspect_runtest_helloworld


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