log4j 是否可以通过条件判断在程序运行中动态选择日志存储目录

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log4j 是否可以通过条件判断在程序运行中动态选择日志存储目录5

比如我有两个用户A和B，我需要记录这两个用户的操作信息：add和del。

我希望把A的日志存放到logs/A/**目录下，比如
logs/A/add/add.log
logs/A/add/del.log

我希望把B的日志存放到logs/B/**目录下，比如
logs/B/add/add.log
logs/B/add/del.log

当程序在记录日志时,知道用户是谁。
如何在记录日志时，让程序根据用户来选择日志存放目录？

log4j支持这样的功能吗，能否给出简明的log4j配置。
在此谢谢各位~

log4j

2014年5月06日 16:46

firewalls
26
0 0 4

1个答案按时间排序按投票排序

0 0

采纳的答案

可以的：

package com.ljn.others;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.PatternLayout;
import org.apache.log4j.RollingFileAppender;
import org.apache.log4j.varia.LevelRangeFilter;

/**
 * @author lijinnan
 * @date:2014-5-7
 */
public class LoggerFactory {

    private static final String SEPARATOR = "/";
    private static final Map<String, Logger> logMap = new HashMap<String, Logger>();

    public static Logger getLogger(String baseDir, String userName,
            String fileName) {
        if (StringUtils.isEmpty(baseDir) || StringUtils.isEmpty(userName) || StringUtils.isEmpty(fileName)) {
            throw new IllegalArgumentException("cannot be empty");
        }
        String key = findKey(userName, fileName);
        Logger logger = logMap.get(key);
        if (logger == null)
            try {
                String logFilePath = baseDir + SEPARATOR + key;
                logger = Logger.getLogger(key);
                PatternLayout playout = new PatternLayout();
                playout.setConversionPattern("%d{[yyyy-MM-dd HH:mm:ss.SSS]}:[%p] %m%n");
                RollingFileAppender fAppender = new RollingFileAppender(playout, logFilePath);
                fAppender.setMaxFileSize("500MB");
                fAppender.setMaxBackupIndex(3);
                fAppender.setAppend(true);
                fAppender.setThreshold(Level.INFO);
                fAppender.setLayout(playout);
                LevelRangeFilter filterInfo = new LevelRangeFilter();
                filterInfo.setLevelMin(Level.INFO);
                filterInfo.setLevelMax(Level.ERROR);
                fAppender.addFilter(filterInfo);
                logger.addAppender(fAppender);
                logMap.put(key, logger);
            } catch (IOException e) {
                logger.error(Thread.currentThread().getName(), e);
            }
        return logger;
    }

    private static String findKey(String userName, String fileName) {
        return userName + SEPARATOR + fileName;
    }

}


package com.ljn.others;

import java.util.Random;

import org.apache.log4j.Logger;

/**
 * @author lijinnan
 */
public class UserService {

    private static final String BASE_DIR = "d:/odd/log";


    public static void main(String[] args) {
        while(true) {
            add();
            del();
            System.out.println("ok");
        }
    }
    
    public static void add() {
        String user = getCurrentUser();
        Logger logger = LoggerFactory.getLogger(BASE_DIR, user, "add.log");
        logger.info(user + " add");
    }
    
    public static void del() {
        String user = getCurrentUser();
        Logger logger = LoggerFactory.getLogger(BASE_DIR, user, "del.log");
        logger.info(user + " del");
    }
    
    
    private static String getCurrentUser() {
        Random random = new Random();
        int i = random.nextInt(10);
        if (i % 2 == 0) {
            return "A"  ;
        }
        return "B";
    }
}

2014年5月07日 17:47