Read text file from position in Java

io, java, text

Solution

Use BufferedReader's `skip()` method. In your case:

BufferedReader reader = new BufferedReader(new FileReader(filePath));
reader.skip(n); // chars to skip
// .. and here you can start reading

And if you want specify a particular encoding you can use

InputStream is = new FileInputStream(filePath);
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"UTF-8"));
reader.skip(n); // chars to skip
// .. and here you can start reading

Problem

I need to read char[] (size is COUNT) from text file from OFFSET with specified Charset. COUNT and OFFSET are in characters, not in bytes. He is my code: ``` raf = new RandomAccessFile(filePath, "r"); if ((mBuffer == null) || (mBuffer.length < count)) { mBuffer = new byte[(int)(count/mDecoder.averageCharsPerByte())]; mByteWrap = ByteBuffer.wrap(mBuffer); mCharBuffer = new char[count]; mCharWrap = CharBuffer.wrap(mCharBuffer); } try { offset = (int)(offset/mDecoder.averageCharsPerByte()); count = (int)(count/mDecoder.averageCharsPerByte()); raf.seek(offset); raf.read(mBuffer,0,count); mByteWrap.position(0); mCharWrap.position(0); mDecoder.decode(mByteWrap, mCharWrap, true); } catch (IOException e) { return null; } return mCharBuffer; ``` Is there any way easier ? (without manual matching char->byte) I was looking about java.util.Scanner, but it's Iterator-style, and i need random access-style. PS data should'n be copied many times

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