如何使用java读取文本文件中的最后一行

如何使用java读取文本文件中的最后一行

问题描述:

我正在创建一个日志,我想读取log.txt文件的最后一行,但是在读取最后一行后我无法让BufferedReader停止。

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.

这是我的代码:

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();
    }
}


这里是一个很好的解决方案
在你的代码中,你可以创建一个名为 lastLine 的辅助变量,并不断地将其重新初始化为当前行,如下所示:

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;
    }