使用Log4j的每个用户的不同日志 [英] A different log for every user using Log4j

问题描述

我有一个web应用程序，我想为每个用户使用不同的日志，因此我可以获得用户在系统上所做的历史记录。

I have a webapplication and I want to use a different log for every user, so I can have a "history" of what the user did on the system.

这是我到目前为止：

import java.io.File;
import java.io.IOException;

import org.apache.log4j.DailyRollingFileAppender;
import org.apache.log4j.FileAppender;
import org.apache.log4j.SimpleLayout;
import org.apache.log4j.Logger;

public class LogManager {

    public Logger getLog(String username) throws IOException{
        SimpleLayout layout = new SimpleLayout(); 
        FileAppender appender = new DailyRollingFileAppender(layout, "users"+File.pathSeparator+username+File.pathSeparator+username, "'.'yyyy-MM");

        // configure the appender here, with file location, etc
        appender.activateOptions();
        Logger logger = Logger.getRootLogger();
        logger.addAppender(appender);
        return logger;
    }

}

问题是，作为一个webapplication是多线程的，所以AFAIK我不能一直使用 RootLogger 并根据我正在登录的用户更改appender。我想我应该为每个用户创建不同的 Logger ，但这是正确的吗？

The problem is that, as a webapplication, is multithreaded, so AFAIK I can't use RootLogger all the time and change the appenders depending on the user who I'm logging. I think I should create different Logger for each user, but is that correct?

推荐答案

尝试切换到 logback （log4j的后继者）。它附带一个 SiftingAppender ，可用于分离（或筛选）日志记录到给定的运行时属性，在您的情况下将是userid。 文档包含基于用户标识分隔日志的示例。

Try switching to logback (log4j's successor). It comes with a SiftingAppender which can be used to separate (or sift) logging according to a given runtime attribute, which would be "userid" in your case. The documentation contains an example for separating logs based on userid.

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