Java aop面向切面编程(aspectJweaver)案例详解
面向切面编程的目的就是:在不改变别人的代码的前提下,在别人代码方法执行前或后,执行(切入自己的逻辑) 准备:idea+maven+aspectjweaver-1.8.9.jar 结构图:
pom.xml内容
<dependencies><dependency><groupId>org.aspectj</groupId><artifactId>aspectjrt</artifactId><version>1.8.9</version></dependency><dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjtools</artifactId> <version>1.8.9</version></dependency><dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.8.9</version></dependency> </dependencies> <build><plugins> <plugin><groupId>org.codehaus.mojo</groupId><artifactId>aspectj-maven-plugin</artifactId><executions> <execution><goals> <goal>compile</goal></goals> </execution></executions><configuration> <complianceLevel>1.8</complianceLevel> <source>1.8</source> <target>1.8</target> <aspectDirectory>src/main/java</aspectDirectory></configuration> </plugin></plugins> </build>
切面类
public aspect Staspect { public pointcut kkMethod(): execution(public String aop.Test.kk()); before(): kkMethod() {System.out.println('先执行我'); }}
主类
public class Test { public String kk(){return '23'; } public static void main(String[] args) {Test test=new Test();System.out.println(test.kk()); }}
新建一个aop.xml(在META-INFO文件夹下)
<?xml version='1.0' encoding='UTF-8' ?><aspectj> <aspects><aspect name='aop.Staspect'/> </aspects> <weaver options='-XaddSerialVersionUID'></weaver></aspectj>
打jar包,执行命令:mvn clean package 注意我的结构图,classes下面如果有两个类就是编译成功了 挑出jar包,执行命令: java -javaagent:/home/admin/aspectjweaver-1.8.9.jar -classpath aspecttest-1.0-SNAPSHOT.jar aop.Test
注意:-javaagent后面的参数是你电脑aspectjweaver-1.8.9.jar的路径
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