cderlearner / jaop

asm字节码编辑从入门到放弃

jaop

写着玩的小工具，稍微修改了cglib的源码，实现aop切面的功能

代码示例

public class Computer {

public <E> boolean isEmptyArray(E... array) {
    return null == array
            || array.length == 0;
}

public int sum(int... numberArray) {
    if (isEmptyArray(numberArray)) {
        return 0;
    }
    int sum = 0;
    for (int n : numberArray) {
        sum += n;
    }
    return sum;
}

}

AOP aop = new AOP.Builder().
        targetClass(Computer.class)
        .targetMethodName("sum")
        .eventListener(new EventListener() {
            @Override
            public void onEvent(Event event) throws Throwable {
                if(event instanceof BeforeEvent) {
                    final BeforeEvent beforeEvent = (BeforeEvent) event;
                    System.err.println("hello 我是before事件");

                    final int[] numberArray = (int[]) beforeEvent.argumentArray[0];

                    numberArray[0] = 100;
                    numberArray[1] = 101;

                    System.err.println("hello 我修改了参数值");

                }else if(event instanceof ReturnEvent) {

                    System.err.println("hello 我是return事件");
                }
            }
        })
        .build();

Computer computer = (Computer) aop.createIntance();

System.err.println(computer.sum(new int[]{1,1}));

输出结果

hello 我是before事件
hello 我修改了参数值
hello 我是return事件
201