How to Read 1st line of a file with BufferedReader?

问题

I was experimenting with BufferedReader to read 1st line file to a string. How do I do this? Also how can I read an entire file to a string? How to read a particular line like readline(int line) without iterating through the previous lines?

File namefile = new File(root, ".name");
FileReader namereader = new FileReader(namefile);
BufferedReader in = new BufferedReader(namereader);

回答1:

You can use BufferedReader.readLine() to get the first line.

Note that the next call to readLine() will get you the 2nd line, and the next the 3rd line....

EDIT:
If you want to specify a specific line, as your comment suggest - you might want to use Apache Commons FileUtils, and use: FileUtils.readLines(). It will get you a List<String> which you can handle like any list, including getting a specific line. Note that it has more overhead because it reads the entire file, and populates a List<String> with its lines.

回答2:

Um, what's wrong with BufferedReader.readLine()?

Reads a line of text. A line is considered to be terminated by any one of a line feed ('\n'), a carriage return ('\r'), or a carriage return followed immediately by a linefeed.

(I don't see any sign of a readFile() method though - what documentation were you looking at?)

Personally I prefer to use FileInputStream wrapped in InputStreamReader instead of FileReader by the way, as otherwise it will always use the platform default encoding - are you sure what's what you want?

回答3:

final File namefile = new File(root, ".name");
final FileReader namereader = new FileReader(namefile);
final BufferedReader in = new BufferedReader(namereader);
in.readLine();

回答4:

If you use the BufferedReader to read the File there should be a Method called

readLine()

wich reads exactly one Line.

http://developer.android.com/reference/java/io/BufferedReader.html

回答5:

See the readline() method of the BufferedReader.

http://docs.oracle.com/javase/1.4.2/docs/api/java/io/BufferedReader.html#readLine%28%29

来源：https://stackoverflow.com/questions/9431970/how-to-read-1st-line-of-a-file-with-bufferedreader

标签

java

android

file-io