如何使用java.nio.channels.FileChannel读取ByteBuffer实现类似BufferedReader＃readLine（）的行为
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我想使用“ 0”来读取文件，但是我想像“ 1”一样逐行读取。之所以需要使用“ 0”而不是“ 3”，是因为我需要在文件上放置一个锁，并从该锁文件中逐行读取。所以我被迫使用to0ѭ。请帮忙
编辑这是我的代码尝试使用FileInputStream获取FileChannel
public static void main(String[] args){
File file = new File(\"C:\\\\dev\\\\harry\\\\data.txt\");
FileInputStream inputStream = null;
BufferedReader bufferedReader = null;
FileChannel channel = null;
FileLock lock = null;
try{
inputStream = new FileInputStream(file);
channel = inputStream.getChannel();
lock = channel.lock();
bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
String data;
while((data = bufferedReader.readLine()) != null){
System.out.println(data);
}
}catch(IOException e){
e.printStackTrace();
}finally{
try {
lock.release();
channel.close();
if(bufferedReader != null) bufferedReader.close();
if(inputStream != null) inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
lock = channel.lock();
finally
lock
null
lock.release()
NullPointerException
没有找到相关结果
已邀请:
1 个回复
委婪绷冗诉
FileOutputStream outStream = null; BufferedWriter bufWriter = null; FileChannel channel = null; FileLock lock = null; try{ outStream = new FileOutputStream(file); channel = outStream.getChannel(); lock = channel.lock(); bufWriter = new BufferedWriter(new OutputStreamWriter(outStream)); }catch(IOException e){ e.printStackTrace(); }