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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