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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