如何从某个偏移量读取文件 [英] How to read a file from a certain offset

问题描述

嘿，我试图打开一个文件，只是从一个偏移量读取一定的长度！
我读了这个主题：
如何从Java中的文件中使用特定行号读取特定行？
在那里它表示不可能读取某一行读之前的行，但我想知道的字节！

  FileReader location = new FileReader（file）; 
 BufferedReader inputFile = new BufferedReader（location）; 
 //从字节读取1000到2000 
 //像这样
 inputFile.read（1000,2000）; 
  

是否可以读取已知偏移量的某些字节？

解决方案

RandomAccessFile 公开了一个函数：

$ p $ find $（$ $ $ $ $ $）从该文件的开始处开始测量下一次读取或写入的偏移量。

Hey I'm trying to open a file and read just from an offset for a certain length! I read this topic: How to read a specific line using the specific line number from a file in Java? in there it said that it's not to possible read a certain line without reading the lines before, but I'm wondering about bytes!

FileReader location = new FileReader(file);
BufferedReader inputFile = new BufferedReader(location);
// Read from bytes 1000 to 2000
// Something like this
inputFile.read(1000,2000);

Is it possible to read certain bytes from a known offset?

解决方案

RandomAccessFile exposes a function:

seek(long pos) 
          Sets the file-pointer offset, measured from the beginning of this file, at which the next read or write occurs.

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