从注释中查找方法 [英] Find method from annotation

问题描述

在 Java 中可以从注解中找到方法吗?例如:

It is possible in Java to find a method from its annotations? For instance:

@Named("Qty") 
public getQty()
{
    return _quantity;
}

@Named("Qty")
public void setQty(long qty)
{
    _quantity = qty;
}

我知道两者都被注释为数量"，例如如何在运行时检索 setter 方法?

I know that both are annotated as "Qty", how can retrieve the setter method for example on runtime?

推荐答案

使用 Reflections图书馆，你可以这样做:

using the Reflections library, you can do something like this:

Reflections reflections = new Reflections("my.package", new MethodAnnotationsScanner());
Set<Method> namedMethods = reflections.getMethodsAnnotatedWith(Names.class);
//or even
Set<Method> qtyMethods = reflections.getMethodsAnnotatedWith(
        new Named() {
            public String value() { return "Qty"; } 
            public Class<? extends Annotation> annotationType() { return Named.class; }
        });

然后，使用传统的 Java 反射很容易获得 setter 方法，尽管反射也可以在这里帮助您:

Then, it's easy to get just the setter methods using conventional java reflection, although Reflections can also help you here:

import static org.reflections.ReflectionsUtils.*;
Set<Method> setterMethods = getAll(methods, withPrefix("set"));

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