如何在Java中的命令行参数（文件路径）中转义斜杠？ [英] How to escape slashes in command line argument (file path) in Java?

问题描述

请注意，我正在Windows下使用NetBeans进行开发。我也在运行JDK 1.8。

程序通过命令行接受几个参数。一个参数是文件路径。用户可能键入 -i C：\test 。我如何逃避斜线？没有什么似乎正常工作。

  public class Test {
 
 public static void main（String [] args）throws FileNotFoundException，ParseException {
 //模拟命令行执行
 String [] arguments = new String [] {-i C：\test}; 
 
 //创建选项对象
选项options = new Options（）; 
 
 //添加选项输入目录路径。 
 options.addOption（i，input，true，指定输入目录路径）; 
 
 //创建解析器
 CommandLineParser parser = new GnuParser（）; 
 
 //解析命令行
 CommandLine cmd = parser.parse（options，arguments）; 
 
 String inputDirectory = cmd.getOptionValue（i）; 
转义字符串
 
 //发送无效正则表达式：错误的内部错误
 escaped = inputDirectory.replaceAll（\\，\\\\\）的错误; 
 
 //这不工作
文件文件=新文件（转义）; 
集合<文件>文件= FileUtils.listFiles（file，null，false）; 
 
 //这个工程
文件file2 =新文件（C：\\test）; 
集合<文件> files2 = FileUtils.listFiles（file2，null，false ）; 
} 
} 
  

我尝试replaceAll，但是像代码，它不编译，它返回一个无效的正则表达式错误。

我知道最好的做法是使用File.separator，但我真的没有线索可以将其应用于命令行参数，也许用户可能键入相对路径，用户引用的文件路径也可以在任何驱动器上。

我逃避了背部睫毛，以便我可以使用FileUtils循环遍历每个文件？

非常感谢您的帮助。

解决方案

更改替换

  escaped = inputDirectory.replaceAll（\\ \\\\）; 
  

至

  escaped = inputDirectory.replaceAll（Pattern.quote（\\），Matcher.quoteReplacement（\\\\））; 
  

由于您正在模拟程序中的参数，请考虑

 -i C：\test
  

实际上是标签（即\t）在 C：和<$ c之间$ c> est

正确的方法是：

 -i C：\\test
  

Please note I'm developing this using NetBeans under Windows. I'm also running JDK 1.8.

The program takes a few arguments, via the command-line. One argument is a file path. The user might type -i C:\test. How do I escape the slash? Nothing seems to work right.

public class Test {

    public static void main(String[] args) throws FileNotFoundException, ParseException {
        // Simulate command line execution
        String[] arguments = new String[] { "-i C:\test" };

        // Create Options object
        Options options = new Options();

        // Add options input directory path.
        options.addOption("i", "input", true, "Specify the input directory path");

        // Create the parser
        CommandLineParser parser = new GnuParser();

        // Parse the command line
        CommandLine cmd = parser.parse(options, arguments);

        String inputDirectory = cmd.getOptionValue("i");
        String escaped;

        // Gives error of "invalid regular expression: Unexpected internal error
        escaped = inputDirectory.replaceAll("\\", "\\\\");

        // This does not work
        File file = new File (escaped);
        Collection<File> files = FileUtils.listFiles(file, null, false);

        // This works
        File file2 = new File ("C:\\test");
        Collection<File> files2 = FileUtils.listFiles(file2, null, false);
    }
}

I tried replaceAll but, like it says in the code, it does not compile and it returns an invalid regular expression error.

I know best practice is to use File.separator, but I honestly have no clue how I can apply it to a command line argument. Maybe the user might type a relative path. The file path the user references could be on any drive, as well.

How do I escape the backslashes so that I can loop through each file with FileUtils?

Thank you very much for any help.

解决方案

Change your replacement

escaped = inputDirectory.replaceAll("\\", "\\\\");

to

escaped = inputDirectory.replaceAll(Pattern.quote("\\"), Matcher.quoteReplacement("\\\\"));

Since you are mimicking the argument within your program, take in account that

 "-i C:\test"

Will actually be a tab (i.e \t) in between C: and est

the correct way would've been:

 "-i C:\\test"

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