如何检查文件是否存在于 Java 中? [英] How do I check if a file exists in Java?

问题描述

如何在打开文件以在 Java 中读取之前检查文件是否存在(相当于 Perl 的 -e $filename)?

How can I check whether a file exists, before opening it for reading in Java (the equivalent of Perl's -e $filename)?

唯一的关于SO的类似问题涉及编写文件，因此使用FileWriter 显然在这里不适用.

The only similar question on SO deals with writing the file and was thus answered using FileWriter which is obviously not applicable here.

如果可能的话，我更喜欢真正的 API 调用返回真/假，而不是一些调用 API 来打开文件并在它抛出异常时进行捕获并检查无文件"在文本中"，但我可以接受后者.

If possible I'd prefer a real API call returning true/false as opposed to some "Call API to open a file and catch when it throws an exception which you check for 'no file' in the text", but I can live with the latter.

推荐答案

使用 java.io.File:

File f = new File(filePathString);
if(f.exists() && !f.isDirectory()) { 
    // do something
}

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