Java 从 .dat 文件中读取信息
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Java Reading in Info from .dat Files
提问by Zeldarulah
Its been a few years since I've input .datfiles into a Javaprogram, and now I need to for this project. I remember back then I used the Scannerclass, but looking through the internet for solutions, it seems like there's a lot of options; things like BufferedReaderand FileStreamclasses that I've never used before, or at least don't remember using.. Anyway, my question is:
自从我将.dat文件输入到Java程序中已经有几年了，现在我需要为这个项目输入文件。我记得当时我用过这Scanner门课，但通过互联网寻找解决方案，似乎有很多选择；我以前从未使用过的类BufferedReader和FileStream类，或者至少不记得使用过..无论如何，我的问题是：
If I'm reading in .dat files of the format:
如果我正在阅读以下格式的 .dat 文件：
998763264 EGCDGHIJJ
697724736 GDHECHHJG
etc.
What class(es)would you recommend I implement to handle this input? / Can you give me an example of said class being used to read in a file?
class(es)您建议我实施什么来处理此输入？/ 你能举个例子说明这个类被用来读入文件吗？
Thanks a lot for the help.
非常感谢您的帮助。
采纳答案by Archer
If your .dat file is a text file which contains patterns you provided, Scanner seems is a good solution for you.
如果您的 .dat 文件是包含您提供的模式的文本文件，则 Scanner 似乎是您的一个不错的解决方案。
Try this code:
试试这个代码：
Scanner sc = new Scanner(new File("test.dat"));
Pattern p = Pattern.compile("([\w\d]*)\s*");
while (sc.findWithinHorizon(p, 0) != null)
{
MatchResult m = sc.match();
System.out.println(m.group(1));
}
回答by ASBH
I could suggest using the FileInputStream and an InputStreamReader.
我可以建议使用 FileInputStream 和 InputStreamReader。
You can find an usage example in this tutorial: http://tutorials.jenkov.com/java-io/inputstreamreader.html
您可以在本教程中找到使用示例：http: //tutorials.jenkov.com/java-io/inputstreamreader.html
In your example, you could use the reader.read(char[] cbuf, int off, int len) method to specifically read the desired chunks of characters.
在您的示例中，您可以使用 reader.read(char[] cbuf, int off, int len) 方法专门读取所需的字符块。
