是否有类似于sl4fj的通用字符串替换功能？ [英] Is there a general string substitution function similar to sl4fj?

问题描述

使用sl4fj，如果我想构造一个字符串消息，有一个很好的方法，它使用替换。例如，它可能类似于：

With sl4fj if I want to construct a string message there is a nice approach which makes use of substitutions. For instance, it might be something like:

logger.info("Action {} occured on object {}.", objectA.getAction(), objectB);

如果需要更多替换，则类似于：

If there are more than a few substitutions required then it is something like:

logger.info("Action {} occured on object {} with outcome {}.", 
    new Object[]{objectA.getAction(), objectB, outcome});

我的问题是：我是否有通用的方法来创建字符串（而不仅仅是slf4j）日志消息）？类似于：

My question is: Is there a generic way for me to create a string (and not just a slf4j log message)? Something like:

String str = someMethod("Action {} occured on object {}.", objectA.getAction(), objectB);

或

String str = someMethod("Action {} occured on object {} with outcome {}.", 
    new Object[]{objectA.getAction(), objectB, outcome});

如果它在标准Java库中，那么someMethod会是什么？

If it is in the standard Java library, what would that "someMethod" be?

推荐答案

String.format

String str = String.format("Action %s occured on object %s.",
   objectA.getAction(), objectB);

或

String str = String.format("Action %s occured on object %s with outcome %s.",
   new Object[]{objectA.getAction(), objectB, outcome});

您还可以使用数字位置，例如切换参数：

You can also use numeric positions, for example to switch the parameters around:

String str = String.format("Action %2$s occured on object %1$s.",
   objectA.getAction(), objectB);

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