Java - 用readLine读取二进制文件 [英] Java - reading file as binary with readLine

问题描述

我有一个逐行读取文件的Ruby代码，并检查是否需要读取下一行到某个块，或者它应该处理该块，并继续阅读文件解析每一行。

这里是：

  File.open（ARGV [0]，'rb'）do | F | 
 fl = false 
 text =''
 
 f.readlines.each do | line | 
 if（line =〜/ ^ end_block /）
 fl = false 
 
＃解析文本变量
结束
 
文本+ =行如果fl == true 
 
 if（line =〜/ ^ start_block /）
 fl = true 
 end 
 end 
 end 
  

我需要打开文件作为二进制阅读，仍然需要一个 readLine 方法。

所以，问题是：如何与Groovy / Java完全相同？

您可以使用 java.io.DataInputStream ，它提供了一个<$ c readLine（）方法和 readFully（byte []）和 read（byte []） readLine 的JavaDoc说：不推荐使用，编码可能不合适（在JavaDoc中阅读详细信息）。

因此，请仔细考虑一下您的真实需求，如果这是您的情况的适当折衷。

I have a Ruby code that reads file line-by-line and checks if it needs to read the next line to some block or it should handle that block and continue reading file parsing each line.

Here's it:

File.open(ARGV[0], 'rb') do |f|
    fl = false
    text = ''

    f.readlines.each do |line|
        if (line =~ /^end_block/)
            fl = false

            # parse text variable
        end

        text += line if fl == true

        if (line =~ /^start_block/)
            fl = true
        end
    end
end

E.g. i need the file to be opened for reading as binary and still i need a readLine method.

So, the question is: how can i do exactly the same with Groovy/Java?

解决方案

You can use java.io.DataInputStream which provides both a readLine() method and readFully(byte[]) and read(byte[]) methods.

Warning: The JavaDoc for readLine says, it is deprecated and that the encoding might be inappropriate (read details in JavaDoc).

So think twice about your real requirements and if this is a suitable trade-off in your case.

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