Question

Date dir = new java.util.Date(System.currentTimeMillis());
String baseDir = "/home/gaurav/usr/logs/ESBegin/";
String newDir = createDateBasedDirectory(baseDir, dir);

Logger logger = Logger.getLogger("MyLog1");  
FileHandler fh;  

try {  

    // This block configure the logger with handler and formatter  
    fh = new FileHandler(newDir+"/data.log");  
    logger.addHandler(fh);
    SimpleFormatter formatter = new SimpleFormatter();  
    fh.setFormatter(formatter);  

    // the following statement is used to log any messages  
    logger.info(stringifiedJson);  

} catch (SecurityException e) {  
    e.printStackTrace();  
} catch (IOException e) {  
    e.printStackTrace();  
}

这将创建一个今天日期的文件夹，但是我想为每天创建一个新文件夹并将日志文件存储在新文件夹中。...意味着每天的文件夹必须具有当天的日志文件我有以下创建文件夹的方法

 public static String createDateBasedDirectory(String baseDirectory, Date argDate) {
        String newDir = null;

        if (baseDirectory != null && argDate != null) {
            try {
                String format = "yyyy-MM-dd";
                DateFormat dateFormatter = new SimpleDateFormat(format);
                String date = dateFormatter.format(argDate);
                File f = new File(baseDirectory);
                File files[] = f.listFiles();
                String dir = null;
                int baseDirLength = baseDirectory.length();
                int checkingLength = baseDirLength + format.length() + 3;

                int maxSeqNo = 0;

                for (int i = 0; i < files.length; i++) {
                    if (files[i].isDirectory()) {
                        dir = files[i].toString();
                        if (dir.length() == checkingLength) {
                            String existingDirDate = dir.substring(baseDirLength, baseDirLength + 10);

                            if (date.equalsIgnoreCase(existingDirDate)) {
                                int dirSeqNo = 
                                    Integer.parseInt(dir.substring(baseDirLength + 11, baseDirLength + 10 + 3));

                                if (dirSeqNo > maxSeqNo) {
                                    maxSeqNo = dirSeqNo;
                                }
                            }
                        }
                    }
                }

                String currSeq = "" + (maxSeqNo + 1);
                if (currSeq.length() == 1) {
                    currSeq = "0" + currSeq;
                }

                newDir = baseDirectory + date;
                new File(newDir).mkdir();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return newDir;
    }

如果要每天创建一个新文件夹，我应该怎么做

Answer 1

您可以使用日志记录框架的功能来执行此操作。例如，使用Log4J's RollingFileAppender。

您可以使用fileName参数来创建新目录。从documentation：

fileName：要写入的文件的名称。如果该文件或其任何父目录不存在，则将创建它们。

Answer 2

检查当前目录是否存在，如果不存在则创建该目录，或者如果存在则直接返回。

/*
 * to make sure everyone knows what's going on 
 * name this method like getOrCreateDailyLogDirectory
 */
public static String createDateBasedDirectory(String baseDirectory, Date argDate) {
    String newDir = null;

    if (baseDirectory != null && argDate != null) {
        try {
            String format = "yyyy-MM-dd";
            DateFormat dateFormatter = new SimpleDateFormat(format);
            String date = dateFormatter.format(argDate);
            // check if the directory exists:
            String todaysLogDir = baseDirectory + "\\" + date; // create the path as String
            // then create a Path (java.nio, alternatives possible)
            Path todaysDirectoryPath = Paths.get(todaysLogDir);
            // and check if this Path exists
            if (Files.exists(todaysDirectoryPath) {
                // if present, just return it in order to write (into) a log file there
                return todaysDirectoryPath.toUri().toString();
            } else {
                // create it the way you want and return the path as String
                ...
            }
            ...
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    return newDir;
}

以这种方式（或类似方式）执行操作始终会返回当天的目录，并在每天第一次尝试登录之前每天创建一次该目录。

如何每天以其名称作为当前日期创建新目录

2 个答案: