整个文本文件到Java中的String [英] Whole text file to a String in Java

问题描述

是否Java有一行读取文本文件的指令，就像C＃中所使用的那样？

我的意思是Java中有什么相当的东西吗？

  String data = System.IO.File.ReadAllText（path to file）; 
  

如果不是...这样做的最佳方式是什么？ p>

编辑：


我喜欢Java标准库中的一种方式...我不能使用第3派对库..

解决方案

AFAIK，没有标准库的单行。
标准库的典型方法是这样的：

  public static String readStream（InputStream is）{
 StringBuilder sb = new StringBuilder（512）; 
 try {
 Reader r = new InputStreamReader（is，UTF-8）; 
 int c = 0; 
 while（（c = r.read（））！= -1）{
 sb.append（（char）c）; 
} 
} catch（IOException e）{
 throw new RuntimeException（e）; 
} 
 return sb.toString（）; 
} 
  

注意：

• ，以便从文件读取文本，如果性能很重要，请使用FileInputStream


• 阅读大文件，建议将流包装在BufferedInputStream


• 流程应由调用者关闭

Does Java has a one line instruction to read to a text file, like what C# has?

I mean, is there something equivalent to this in Java?:

String data = System.IO.File.ReadAllText("path to file");

If not... what is the 'optimal way' to do this...?

Edit:
I prefer a way within Java standard libraries... I can not use 3rd party libraries..

解决方案

AFAIK, there is no one-liner with standard libraries. Typical approach with standard libraries would be something like this:

public static String readStream(InputStream is) {
    StringBuilder sb = new StringBuilder(512);
    try {
        Reader r = new InputStreamReader(is, "UTF-8");
        int c = 0;
        while ((c = r.read()) != -1) {
            sb.append((char) c);
        }
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
    return sb.toString();
}

Notes:

• in order to read text from file, use FileInputStream
• if performance is important and you are reading large files, it would be advisable to wrap the stream in BufferedInputStream
• the stream should be closed by the caller

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