(Level.WARNING); // 控制台只输出WARNING及以上级别的日志

FileHandler fileHandler = new FileHandler("app.log", true);

        fileHandler.setLevel(Level.ALL); // 文件将记录所有级别的日志
        fileHandler.setFormatter(new SimpleFormatter() {
            @Override
            public synchronized String format(LogRecord record) {
                // 自定义日志格式
                return String.format("%1$tF %1$tT [%2$s] %3$s %n", record.getMillis(), record.getLevel(), record.getMessage());
            }
        });
        logger.addHandler(fileHandler);
    } catch (IOException e) {
        e.printStackTrace();
    }

    // 创建并设置Filter
    Filter filter = new Filter() {
        @Override
        public boolean isLoggable(LogRecord record) {
            // 这里可以添加过滤逻辑，例如只记录包含特定字符串的日志
            return record.getMessage().contains("important");
        }

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