java Aspectj 覆盖方法的参数
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Aspectj overwrite an argument of a method
提问by eglobetrotter
I'm developing an aspect that checks arguments of setter methods and overwrites empty strings with null value. This is my state so far:
我正在开发一个方面，它检查 setter 方法的参数并用空值覆盖空字符串。到目前为止，这是我的状态：
@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;
}
}
}Unfortunately the overwrite statement args[i] = null;does now work! Do anyone know how should I overwrite it?
不幸的是，overwrite 语句args[i] = null;现在可以工作了！有谁知道我应该如何覆盖它？
Cheers,
干杯，
Kevin
凯文
回答by Ralph
I believe you have to implement an around advice, instead of a before advice.
我相信你必须实现一个 around 建议，而不是一个 before 建议。
Because you can use proceed with your new arguments:
因为您可以使用继续您的新参数：
proceed(newArgs);
