从 Java 中的文件位置获取文件名
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Get file name from a file location in Java
提问by Ankur
I have a Stringthat provides an absolute path to a file (including the file name). I want to get just the file's name. What is the easiest way to do this?
我有一个String提供文件的绝对路径（包括文件名）。我只想获取文件名。什么是最简单的方法来做到这一点？
It needs to be as general as possible as I cannot know in advance what the URL will be. I can't simply create a URL object and use getFile()- all though that would have been ideal if it was possible - as it's not necessarily an http://prefix it could be c:/ or something similar.
它需要尽可能通用，因为我无法提前知道 URL 是什么。我不能简单地创建一个 URL 对象并使用getFile()- 尽管如果可能的话这一切都是理想的 - 因为它不一定是http://前缀，它可以是 c:/ 或类似的东西。
采纳答案by akarnokd
new File(fileName).getName();
or
或者
int idx = fileName.replaceAll("\\", "/").lastIndexOf("/");
return idx >= 0 ? fileName.substring(idx + 1) : fileName;
Notice that the first solution is system dependent. It only takes the system's path separator character into account. So if your code runs on a Unix system and receives a Windows path, it won't work. This is the case when processing file uploads being sent by Internet Explorer.
请注意，第一个解决方案取决于系统。它只考虑系统的路径分隔符。因此，如果您的代码在 Unix 系统上运行并收到 Windows 路径，它将无法工作。处理 Internet Explorer 发送的文件上传时就是这种情况。
回答by victor hugo
new File(absolutePath).getName();
回答by skaffman
Apache Commons IOprovides the FilenameUtils class which gives you a pretty rich set of utility functions for easily obtaining the various components of filenames, although The java.io.File class provides the basics.
Apache Commons IO提供了 FilenameUtils 类，它为您提供了一组非常丰富的实用函数，用于轻松获取文件名的各种组件，尽管 java.io.File 类提供了基础知识。
回答by Sebastian Juarez
From Apache Commons IO FileNameUtils
来自Apache Commons IO FileNameUtils
String fileName = FilenameUtils.getName(stringNameWithPath);
回答by Om Sao
Here are 2 ways(both are OS independent.)
这里有 2 种方式（两者都是独立于操作系统的。）
Using Paths: Since 1.7
使用Paths：自 1.7
Path p = Paths.get(<Absolute Path of Linux/Windows system>);
String fileName = p.getFileName().toString();
String directory = p.getParent().toString();
Using FilenameUtilsin Apache Commons IO :
使用FilenameUtils了Apache下议院IO：
String name1 = FilenameUtils.getName("/ab/cd/xyz.txt");
String name2 = FilenameUtils.getName("c:\ab\cd\xyz.txt");
