Java Scanner换行符识别

问题描述

我找不到默认情况下指定扫描程序如何处理换行模式的文档。我想逐行读取文件，让扫描仪能够处理\ r，\ n或\\\\ n行结尾，无论程序实际运行的系统如何。

如果我声明这样的扫描仪：

 扫描仪扫描仪=新的扫描仪（读卡器）; 
  

默认行为是什么？它会处理如上所述的所有三种类型，还是我必须明确告诉它呢？

解决方案

查看源代码Sun JDK 1.6的代码，使用的模式是\\\\ || [\\\\\\\\\\\\\\\\\\\\\\\\\\ >分别为行分隔符，段分隔符和下一行分别表示\\ n或\ r，\ n中的任何一个或unicode字符。

I can't find the documentation that specifies how a Scanner treats newline patterns by default. I want to read a file line by line and have the scanner be able to handle \r, \n or \r\n line endings regardless of the system the program is actually running on.

If I declare a scanner like so:

Scanner scanner = new Scanner(reader);

what is the default behaviour? Will it handle all three kinds as described above or do I have to tell it explicitly to do it?

解决方案

Looking at the source code for Sun JDK 1.6, the pattern used is "\r\n|[\n\r\u2028\u2029\u0085]"

which says "\r\n" or any one of \r, \n or the unicode characters for "line separator", "paragraph separator", and "next line" respectively.

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