exception-handling - Can you throw an exception from a Raw AspectJ Before advice

Question

I'm writing a non-spring aop aspect using aspectJ and I'm writing a before advice for it.

In my before advice, let's say I want to open a file. So I execute it as such:

 public before(): mypointcut() {
    File file = new File("myfile");
    file.getCanonicalPath();
 }

But IntelliJ gripes about IOException being an unhandled exception. How can I write the before advice such that it can either catch and rethrow the exception or allow the unhandled exception?

Answer 1

为了将异常提交到调用堆栈，您必须在通知中添加 throws 声明，就像使用普通方法调用一样：

public before() throws IOException: mypointcut() {...}

此建议只能应用于自己声明抛出此异常（或异常的父级）的方法。

为了重新抛出它，您需要捕获异常并在 RuntimeException 实例中重新抛出它，如下所示：

public before(): mypointcut() {
    File file = new File("myfile");
    try {
        file.getCanonicalPath();
    } catch (IOException ex) {
        throw new RuntimeException(e);
    }
}

如果这是一个好主意，那就另当别论了……