How can we read log files with Java?

There are several ways to read log files in Java.

1. Use the InputStream and BufferedReader classes: You can obtain the input stream of the log file by using FileInputStream or URL, and then read the file content line by line using BufferedReader.

try {
    BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream("path/to/logfile.log")));
    String line;
    while ((line = reader.readLine()) != null) {
        // 处理每一行日志内容
    }
    reader.close();
} catch (IOException e) {
    e.printStackTrace();
}

1. Process line by line.

try {
    List<String> lines = Files.readAllLines(Paths.get("path/to/logfile.log"));
    for (String line : lines) {
        // 处理每一行日志内容
    }
} catch (IOException e) {
    e.printStackTrace();
}

1. Process line by line.

try {
    List<String> lines = IOUtils.readLines(new FileInputStream("path/to/logfile.log"), Charset.defaultCharset());
    for (String line : lines) {
        // 处理每一行日志内容
    }
} catch (IOException e) {
    e.printStackTrace();
}

Here are several common ways to read log files. You can choose the appropriate method based on your specific needs.