使用LTW(LoadTimeWeaving)技术实现AOP功能
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java/使用LoadTimeWeaving技术实现AOP功能.md
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java/使用LoadTimeWeaving技术实现AOP功能.md
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## 使用LTW(LoadTimeWeaving)技术实现AOP功能
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### aop增强分类
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###### 编译时：
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使用特殊的编译器在编译期将切面织入目标类,这种比较少见,因为需要特殊的编译器的支持。例如，AspectJ编译 器，很少有到，目前我还没有用到。
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###### 加载时：
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通过字节码编辑技术在类加载期将切面织入目标类中,它的核心思想是：在目标类的class文件被JVM加 载前,通过自定义类加载器或者类文件转换器将横切逻辑织入到目标类的class文件中，然后将修改后class文件交给JVM加载 这种织入方式可以简称为LTW(LoadTimeWeaving)，AspectJ的LoadTimeWeaving (LTW)
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###### 运行时：
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运行期通过为目标类生成动态代理的方式实现AOP就属于运行期织入，这也是Spring AOP中的默认实现,并且提供了两种创建动态代理的方式：JDK自带的针对接口的动态代理和使用CGLib动态创建子类的方式创建动态代理。
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### 优劣势
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编译时：需要特殊的编译器
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加载时：需要特殊的类加载器
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运行时：功能有限
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### 使用LTW 切面第三方JAR 包（普通maven项目）
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#### 配置文件
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##### pom 文件
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```xml
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>cn.x47.blog</groupId>
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<artifactId>LoadTimeWeaving-demo</artifactId>
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<version>1.0</version>
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</parent>
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<artifactId>java-aspectj-agent</artifactId>
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<version>1.0</version>
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<packaging>jar</packaging>
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<dependencies>
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<dependency>
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<groupId>com.alibaba</groupId>
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<artifactId>fastjson</artifactId>
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</dependency>
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<dependency>
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<groupId>org.aspectj</groupId>
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<artifactId>aspectjweaver</artifactId>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>2.3.2</version>
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<configuration>
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<source>1.8</source>
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<target>1.8</target>
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</configuration>
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</plugin>
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<plugin>
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<artifactId>maven-assembly-plugin</artifactId>
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<configuration>
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<descriptorRefs>
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<descriptorRef>jar-with-dependencies</descriptorRef>
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</descriptorRefs>
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<archive>
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<manifest>
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<mainClass>cn.x47.ltw.Main</mainClass><!--这里改成自己的主类位置-->
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</manifest>
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</archive>
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</configuration>
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<executions>
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<execution>
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<id>make-assembly</id>
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<phase>package</phase>
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<goals>
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<goal>single</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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</project>
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```
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##### aop.xml
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放在`META-INF/aop.xml`
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```
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<!DOCTYPE aspectj PUBLIC "-//AspectJ//DTD//EN" "https://www.eclipse.org/aspectj/dtd/aspectj.dtd">
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<aspectj>
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<weaver>
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<!-- 注意 目标类 和使用目标类方法的类都要配置 -->
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<include within="cn.x47.ltw..*"/>
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<include within="com.alibaba.fastjson.*"/>
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</weaver>
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<aspects>
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<!-- 切面 -->
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<aspect name="cn.x47.ltw.ProfilingAspect"/>
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</aspects>
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</aspectj>
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```
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### 目录结构
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### 执行方法
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##### 开发环境
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可以通过添加jvm参数的方式来启动
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### springboot 使用 LTW切面第三方JAR包
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#### 配置文件
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##### pom配置
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```
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>cn.x47.blog</groupId>
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<artifactId>LoadTimeWeaving-demo</artifactId>
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<version>1.0</version>
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</parent>
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<artifactId>springboot-aspectj-agent</artifactId>
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<version>1.0</version>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<dependency>
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<groupId>com.alibaba</groupId>
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<artifactId>fastjson</artifactId>
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<version>2.0.12</version>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-aop</artifactId>
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</dependency>
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<dependency>
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<groupId>org.aspectj</groupId>
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<artifactId>aspectjweaver</artifactId>
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<version>1.9.9</version>
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</dependency>
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<optional>true</optional>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>
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```
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##### oop配置
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```
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<?xml version="1.0" encoding="UTF-8" ?>
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<aspectj>
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<weaver options="-XnoInline -Xset:weaveJavaxPackages=true -Xlint:ignore -verbose -XmessageHandlerClass:org.springframework.aop.aspectj.AspectJWeaverMessageHandler">
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<!--在编织时导入切面类和需要被切入的目标类-->
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<include within="cn.x47.ltw..*"/>
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<include within="com.alibaba.fastjson..*"/>
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</weaver>
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<aspects>
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<!--指定切面类-->
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<aspect name="cn.x47.ltw.springboot.aop.TestAspect"/>
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</aspects>
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</aspectj>
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```
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#### 目录结构
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### 源码地址
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https://git.dr1997.com/chenkuangwei/LoadTimeWeaving-demo
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