解决log4j BufferedIO=true 时，buffer有残余日志不能记录的问题

最新推荐文章于 2023-09-24 11:19:53 发布

原创最新推荐文章于 2023-09-24 11:19:53 发布 · 7k 阅读

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本文介绍了一个定制的Log4j DailyRollingFileAppender类实现，该类在原有基础上增加了确保日志文件目录存在、设置缓冲区大小等功能，并在系统关闭时强制刷新日志缓存。

废话不说，直接上代码

public class DailyRollingFileAppender extends
        org.apache.log4j.DailyRollingFileAppender {

    public DailyRollingFileAppender() {
        super();
        Runtime.getRuntime().addShutdownHook(new Log4jHockThread());
    }

    public DailyRollingFileAppender(Layout layout, String filename,
            String datePattern) throws IOException {
        super(layout, filename, datePattern);
        Runtime.getRuntime().addShutdownHook(new Log4jHockThread());
    }

    @Override
    public synchronized void setFile(String fileName, boolean append,
            boolean bufferedIO, int bufferSize) throws IOException {
        File logfile = new File(fileName);

        logfile.getParentFile().mkdirs();

        super.setFile(fileName, append, bufferedIO, bufferSize);
    }

    public QuietWriter getQw() {
        return super.qw;
    }

    private class Log4jHockThread extends Thread {
        @Override
        public void run() {
            QuietWriter qw = DailyRollingFileAppender.this.getQw();
            if (qw != null) {
                qw.flush();
            }
        }
    }
}