DynamicLog4jLogger.java 文件源码

private Appender buildAppender(String name, String fileName, String pattern) {
    DailyRollingFileAppender appender = new DailyRollingFileAppender();
    appender.setName(name);
    appender.setAppend(true);
    appender.setEncoding(getEncoding());
    appender.setLayout(new PatternLayout(pattern));
    appender.setFile(new File(getLogPath(), fileName).getAbsolutePath());
    appender.activateOptions();// 很重要，否则原有日志内容会被清空
    return appender;
}