如何找出用于分割线的BufferedReader＃readLine（）哪个行分隔符？ [英] How to find out which line separator BufferedReader#readLine() used to split the line?

问题描述

我正在通过BufferedReader读取文件

I am reading a file via the BufferedReader

String filename = ...
br = new BufferedReader( new FileInputStream(filename));
while (true) {
   String s = br.readLine();
   if (s == null) break;
   ...
}

我需要知道这些线是否分开通过'\ n'或'\\\\''
有没有办法找到答案？

I need to know if the lines are separated by '\n' or '\r\n' is there way I can find out ?

我不想打开FileInputStream以便最初扫描它。
理想情况下，我想询问BufferedReader，因为它必须知道。

I don't want to open the FileInputStream so to scan it initially. Ideally I would like to ask the BufferedReader since it must know.

我很乐意覆盖BufferedReader来破解它，但我真的不想打开文件流两次。

I am happy to override the BufferedReader to hack it but I really don't want to open the filestream twice.

谢谢，

注意：当前行分隔符（由System.getProperty（line.separator）返回）不能用作文件可能是由另一个应用程序在另一个操作系统上编写的。

推荐答案

阅读 java docs （我承认自己是一名pythonista），它似乎没有一种干净的方法来确定特定文件中使用的行端编码。

After reading the java docs (I confess to being a pythonista), it seems that there isn't a clean way to determine the line-end encoding used in a specific file.

我建议的最好的方法是使用 BufferedReader.read（）并迭代文件中的每个字符。这样的事情：

The best thing I can recommended is that you use BufferedReader.read() and iterate over every character in the file. Something like this:

String filename = ...
br = new BufferedReader( new FileInputStream(filename));
while (true) {
   String l = "";
   Char c = " ";
   while (true){
        c = br.read();
        if not c == "\n"{
            // do stuff, not sure what you want with the endl encoding
            // break to return endl-free line
        }
        if not c == "\r"{
            // do stuff, not sure what you want with the endl encoding
            // break to return endl-free line
            Char ctwo = ' '
            ctwo = br.read();
            if ctwo == "\n"{
                // do extra stuff since you know that you've got a \r\n
            }
        }
        else{
            l = l + c;
        }
   if (l == null) break;
   ...
   l = "";
}

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