問(wèn)題描述

java 文件操作，如何向指定的位置插入內(nèi)容 (不是替換內(nèi)容) ?

問(wèn)題解答

不存在真正意義上的插入文件，因?yàn)槲募笮∈谴_定的。所以只能用臨時(shí)文件去替換源文件。

public void insert(String filename, long offset, byte[] content) { RandomAccessFile r = new RandomAccessFile(new File(filename), 'rw'); RandomAccessFile rtemp = new RandomAccessFile(new File(filename + '~'), 'rw'); long fileSize = r.length(); FileChannel sourceChannel = r.getChannel(); FileChannel targetChannel = rtemp.getChannel(); sourceChannel.transferTo(offset, (fileSize - offset), targetChannel); sourceChannel.truncate(offset); r.seek(offset); r.write(content); long newOffset = r.getFilePointer(); targetChannel.position(0L); sourceChannel.transferFrom(targetChannel, newOffset, (fileSize - offset)); sourceChannel.close(); targetChannel.close();}

https://stackoverflow.com/que...

你參考下這個(gè)：

https://faceghost.com/questio...