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

问题描述：

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~

答

可以的：
[code="java"]
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 logMap = new HashMap();

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";
}
}

[/code]

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