Question

我想写一些包含执行者信息的信息日志。假设我有这个SaveUser函数：

question <- "Which hormone concentrations are altered in patients with the Allan Herndon Dudley syndrome?"

searchMM <- function(x, remDr){
  remDr$findElement("css","textarea")$clearElement()
  remDr$findElement("css","textarea")$sendKeysToElement(list(x))
  remDr$findElement("css", "#note > input[type='button']:nth-child(12)")$clickElement()
  concept <- remDr$findElement("css","table:nth-child(31) pre")$getElementText()
  remDr$goBack()
  concept <- unlist(concept)
  test <- unlist(str_split(concept, "\n"))

output <- list(test,concept)
return(output)
}

test <- searchMM(x=question, remDr=remDr)

我想在Controller层调用它：

public class UserDAO {
    Logger logger = LogManager.getLogger();

    public void SaveUser(User user, LoggerInfo info) {
        logger.info("Executor {} trying to save user {}...", "Executor name comes here", user.name);

        this.saveToFirstDB(user);
        this.saveToSecondDB(user);

        logger.info("Executor {} succesfully saved user {}.", "Executor name comes here", user.name);
    }

    private void SaveToFirstDB(User user) {
        logger.info("Executor {}, enter SaveToFirstDB.", "Executor name comes here", user.name);

        // save user to first db..

        logger.info("Executor {}, exit SaveToFirstDB.", "Executor name comes here", user.name);
    }

    private void SaveToSecondDB(User user) {
        logger.info("Executor {}, enter SaveToSecondDB.", "Executor name comes here", user.name);
        I
        // save user to second db..

        logger.info("Executor {}, exit SaveToSecondDB.", "Executor name comes here", user.name);        
    }
}

当然我可以注入执行者名称，但我不认为我应该这样做（这只是一个简单的例子，我想注入更多细节，如日期，角色等等。）。

我不想注入细节，我不希望DAL（例如）知道Controller层的上下文对象（Play，Spark ..）。那么在后端编写信息性日志的正确方法是什么？

Answer 1

您可以使用Log4j映射诊断上下文。在此方法中，您可以编写请求拦截器或servlet过滤器以在Log4j MDC中设置其他属性。您的servlet过滤器如下所示 -

@Override
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        try {
            /*
             * This code puts the value "userName" to the Mapped Diagnostic
             * context. Since MDc is a static class, we can directly access it
             * with out creating a new object from it. Here, instead of hard
             * coding the user name, the value can be retrieved from a HTTP
             * Request object.
             */
            MDC.put("userName", req.attribute("executor"));
            MDC.put("date", System.currentTimeMilis());
            MDC.put("role", getRole()); 
            //Any other properties you want to set
            chain.doFilter(request, response);

        } finally {
            MDC.remove("userName");
        }
    }

然后你可以为你的UserDao类编写cutomize log4j模式。

[%d{ISO8601}] %X{userName} %X{role} %p %c - %m%n

以上语法仅供参考。

在记录时在其他层中使用会话数据的正确方法

1 个答案: