how to read last line in a text file using java [duplicate]

问题

This question already has answers here:

Quickly read the last line of a text file? (9 answers)

Closed 6 years ago.

I am making a log and I want to read the last line of the log.txt file, but I'm having trouble getting the BufferedReader to stop once the last line is read.

Here's my code:

try {
    String sCurrentLine;

    br = new BufferedReader(new FileReader("C:\\testing.txt"));

    while ((sCurrentLine = br.readLine()) != null) {
        System.out.println(sCurrentLine);
    }
} catch (IOException e) {
    e.printStackTrace();
} finally {
    try {
        if (br != null)br.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }
}

回答1:

Here's a good solution.

In your code, you could just create an auxiliary variable called lastLine and constantly reinitialize it to the current line like so:

    String lastLine = "";

    while ((sCurrentLine = br.readLine()) != null) 
    {
        System.out.println(sCurrentLine);
        lastLine = sCurrentLine;
    }

回答2:

This snippet should work for you:

    BufferedReader input = new BufferedReader(new FileReader(fileName));
    String last, line;

    while ((line = input.readLine()) != null) { 
        last = line;
    }
    //do something with last!

来源：https://stackoverflow.com/questions/17509781/how-to-read-last-line-in-a-text-file-using-java