将对象信息打印为 toString() 而不使用 toString()？

发布于 2024-11-28 01:26:40 字数 622 浏览 1 评论 0原文

我的问题是，是否可以从 JAVA 中不提供 toString() 方法的类中打印出特定信息？

问题是：我们为我们的应用程序提供了一个记录器（使用aspectJ），它打印出给出的特定参数。例如：

public void addGroupMembers(Group group, String doneBy, DataListModel<User> users) {
    doSomething()
}

我们的 Logger 打印以下内容：

addGroupMembers called with given arguments:
Group = [id = ..... and so on]
username
DataListModel$1231 <-

我们必须使用 DataListModel-Class，因为我们在后台使用 JSF。但是，正如您所看到的，此类不提供 toString 方法。

我们的记录器是我们自己编写的，因此我们可以对其进行调整。是否可以模拟 toString 方法，例如：如果类不提供 toString，则捕获其所有字段并打印它们？

或者还有其他办法吗？

预先感谢您的帮助。你好，雷钩

原文

my Question is, is it possible to print out specific information from a class that provides no toString() method in JAVA?

There's the rub: We provide a logger for our application (using aspectJ) which prints out the specific arguments, that were given. For example:

public void addGroupMembers(Group group, String doneBy, DataListModel<User> users) {
    doSomething()
}

And our Logger prints the following:

addGroupMembers called with given arguments:
Group = [id = ..... and so on]
username
DataListModel$1231 <-

We have to use the DataListModel-Class, because we're working with JSF in the background. But, as you can see, this class doesn't provide a toString method.

Our logger is written by ourself, so we can adapt that. Is it possible to simulate a toString method like: If the class doesn't provide a toString, catch all their fields, and print them?

Or is there any other way?

Thanks in advance for your help.
Greetings, Thunderhook

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浪漫人生路 2024-12-05 01:26:40

您可以使用 ReflectionToStringBuilder< /a>.像这样的东西：

if (object.toString().endsWith("@" + Integer.toHexString(object.hashCode())) {
  // default toString()...
  return ReflectionToStringBuilder.toString(object);
}
else {
  return object.toString();
}

You could make use of ReflectionToStringBuilder. Something like:

if (object.toString().endsWith("@" + Integer.toHexString(object.hashCode())) {
  // default toString()...
  return ReflectionToStringBuilder.toString(object);
}
else {
  return object.toString();
}

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墨小墨 2024-12-05 01:26:40

我已经使用反射完成了几次。我有一个通用方法，本质上是 dumpObject，它迭代字段并将它们放入字符串中。这非常有效，但如果您经常调用此函数，请务必考虑性能 - 最好对 tostring 进行硬编码。例如，

    for (Field field : obj.getClass().getDeclaredFields()) {
        field.setAccessible(true); 
        log.info(field.getName()
                 + " - " + field.getType()
                 + " - " + field.get(obj));
    }

I've done this a few times using reflection. I had a generic method that was essentially dumpObject that iterated through the fields and put them to a string. This works great, but be sure to consider performance if you're calling this often - it might be better to hard code the tostring. e.g.,

    for (Field field : obj.getClass().getDeclaredFields()) {
        field.setAccessible(true); 
        log.info(field.getName()
                 + " - " + field.getType()
                 + " - " + field.get(obj));
    }

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