Aspectj 覆盖方法的参数 [英] Aspectj overwrite an argument of a method

问题描述

我正在开发一个方面来检查 setter 方法的参数并用空值覆盖空字符串.这是我目前的状态:

I'm developing an aspect that checks arguments of setter methods and overwrites empty strings with null value. This is my state so far:

@Before("execution(* de.foo.entity.*.set*(..)) && args(java.lang.String)")
public void check(final JoinPoint jp) {
    LOGGER.debug(jp.getSignature().toLongString());
    Object[] args = jp.getArgs();
    for (int i = 0; i < args.length; i++) {
        if (args[i] instanceof String && ((String) args[i]).isEmpty()) {
            args[i] = null;
        }
    }
}

不幸的是，覆盖语句 args[i] = null; 现在可以工作了！有谁知道我应该如何覆盖它?

Unfortunately the overwrite statement args[i] = null; does now work! Do anyone know how should I overwrite it?

干杯，

凯文

推荐答案

我相信你必须实现一个 around 建议，而不是一个 before 建议.

I believe you have to implement an around advice, instead of a before advice.

因为您可以使用继续您的新参数:

Because you can use proceed with your new arguments:

proceed(newArgs);

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