获取子类的泛型class

public interface IHandler<I, O> {

    default Class<?> clz() {
        Class<?>[] classes = org.springframework.core.GenericTypeResolver.resolveTypeArguments(getClass(), IHandler.class);
        return classes[0];
    }

}

ihandler的子类实现调用clz即可获取泛型 I的class

对象复制

 public static void copy(Object src, Object dest) {
    Field[] fields = src.getClass().getDeclaredFields();
    Class<?> srcClass = src.getClass();
    Class<?> destClass = dest.getClass();
    for (Field f : fields) {
        try {
            String key = f.getName();
            String getMethodName = "get" + key.substring(0, 1).toUpperCase() + key.substring(1);
            String setMethodName = "set" + key.substring(0, 1).toUpperCase() + key.substring(1);
            Method getMethod = srcClass.getDeclaredMethod(getMethodName);
            Method setMethod = destClass.getDeclaredMethod(setMethodName, f.getType());
            Object value = getMethod.invoke(src);
            if (value != null) {
                setMethod.invoke(dest, value);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

泛型擦除的解决方案

url

参考spring event的 ResolvableTypeProvider

    @Override
    public ResolvableType getResolvableType() {
        return ResolvableType.forClassWithGenerics(getClass(), ResolvableType.forInstance(getData()));
    }