Log4JavaScript服务器端接收 [英] Log4JavaScript server-side receiving

问题描述

我试图使用Log4Javascript将客户端错误发送到服务器，然后可以将结果写入文件。我正在使用AjaxAppender尝试将数据发送到服务器。我从一个简单的Hello world开始，看看我是否能够弄清楚如何接收错误消息，因为文档中字面意思是没有提供服务器端代码。

基本上，我对此比较陌生。一个优秀的Java程序员，HTML，CSS，Javascript等等。但是我最近深入到了JSP的世界，我试图用它来接收错误消息，并且（现在）将它们打印到调试控制台。

我的index.jsp文件中包含最少的代码。只是一个h1标签，上面写着Hello World和指向我的javascript和jquery的链接。

我的Javascript如下：

  var url =logger.jsp; 
 $（function（）{
 var log = log4javascript.getDefaultLogger（）; 
 var ajaxAppender = new log4javascript.AjaxAppender（url）; 
 ajaxAppender.addHeader（Content-Type ;application / json）; 
 log.addAppender（ajaxAppender）; 
 window.onerror = function（errorMsg，url，lineNumber）{
 log.fatal（Uncaught error+ errorMsg +in+ url +，line+ lineNumber）; 
}; 
 log.info（Hello World）; 
} 
  

我不确定数据是如何传递给服务器的，所以我决定列出所有的属性并从那里开始。到目前为止，我拥有以下是服务器端代码（logger.jsp）：

 <％@ page import =java.util。* ％> 
 
 <％
 for（Enumeration e = session.getAttributeNames（）; e.hasMoreElements（）;）{
 String attribName =（String）e.nextElement （）; 
 Object attribValue = session.getAttribute（attribName）; 
 System.out.println（attribName + - + attribVal UE）; 
} 
％> 
  

将以下内容输出到控制台：

  logger  -  test.Logger@5a5517ef 
  

我已经做了很多谷歌搜索，但到目前为止没有提供任何与服务器端有关的帮助。我很可能错过了一些东西，所以如果有人经历过这个，并且有任何提示，甚至是一个非常简单的例子，那就是如何从AjaxAppender接收Log4JavaScript的消息，我将不胜感激！

$ b $如果您想发送JSON，请使用解决方案

AjaxAppender 中的nofollow> JsonLayout ：

  var log = log4javascript.getDefaultLogger（）; 
 var ajaxAppender = new log4javascript.AjaxAppender（url）; 
 var jsonLayout = new log4javascript.JsonLayout（）; 
 ajaxAppender.setLayout（jsonLayout）; 
 log.addAppender（ajaxAppender）; 
 log.info（Hello World）; 
  

这将以HTTP格式数据的形式发送日志消息，其中一个名称/值对的名称为 data ，其值是日志消息的JSON表示。 AjaxAppender 的文档。

I'm trying to use Log4Javascript to send client-side errors to the server where results can then be written to file. I'm using the AjaxAppender to try to send the data to the server. I started with a simple "Hello world" to see if I can figure out how to receive error messages because the documentation literally says "no server-side code is provided".

Basically, I'm relatively new to this. A good Java programmer, HTML, CSS, Javascript, etc. But I've recently dived into the world of JSP and I was trying to use that to receive the error messages and (for now) print them to the debug console.

I have minimal code in my index.jsp file. Just an h1 tag that says "Hello World" and links to my javascript and jquery.

My Javascript is as follows:

var url = "logger.jsp";
$(function(){
    var log = log4javascript.getDefaultLogger();
    var ajaxAppender = new log4javascript.AjaxAppender(url);
    ajaxAppender.addHeader("Content-Type", "application/json");
    log.addAppender(ajaxAppender);
    window.onerror = function(errorMsg, url, lineNumber){
        log.fatal("Uncaught error "+errorMsg+" in "+url+", line "+lineNumber);
    };
    log.info("Hello World");
}

And I wasn't sure how the data would be passed to the server so I decided to list all attributes and start there. So far, I have the following as server-side code (logger.jsp):

<%@page import="java.util.*"%>

<%
for (Enumeration e = session.getAttributeNames(); e.hasMoreElements(); ) {     
    String attribName = (String) e.nextElement();
    Object attribValue = session.getAttribute(attribName);
    System.out.println(attribName+" - "+attribValue);
}
%> 

Which prints the following to the console:

logger - test.Logger@5a5517ef

I've done a lot of Google searches but came up with nothing that helps with the server side so far. It's quite possible that I missed something so if anyone has gone through this and has any tips or even a VERY bare-bones example of how to receive messages from the AjaxAppender for Log4JavaScript, I would greatly appreciate it!

解决方案

If you want to send JSON, use a JsonLayout in your AjaxAppender:

var log = log4javascript.getDefaultLogger();
var ajaxAppender = new log4javascript.AjaxAppender(url);
var jsonLayout = new log4javascript.JsonLayout();
ajaxAppender.setLayout(jsonLayout);
log.addAppender(ajaxAppender);
log.info("Hello World");

This will send the logging message as HTTP form data with one name/value pair whose name is data and whose value is a JSON representation of your logging message.

This is covered in the documentation for AjaxAppender.

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