log4j DEBUG工具类-优快云博客

本文链接：https://blog.youkuaiyun.com/nid/article/details/84468957
这是一个用于管理Log4J配置的Web界面应用，允许用户通过浏览器调整日志级别。该界面支持过滤器功能，可以根据日志名称进行筛选，并提供了一种简单的方法来更改各个日志记录器的有效级别。
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<%@ page language="java" contentType="text/html;charset=UTF-8"%>
<%@ page import="org.apache.log4j.Level"%>
<%@ page import="org.apache.log4j.LogManager"%>
<%@ page import="org.apache.log4j.Logger"%>
<%@ page import="java.util.*"%>
<% long beginPageLoadTime = System.currentTimeMillis();%>
<%
String ip = request.getRemoteAddr();
String allowStart = "192.168.";
if(!ip.startsWith(allowStart)){
	response.setStatus(403);
	out.print("your ip " + ip + " is not allowed!");
	return;
}
%>

<html>
  <head>
    <title>Log4J Admin</title>
    <style type="text/css">
      <!--
      #content { margin: 0px; padding: 0px; text-align: center; background-color: #ccc; border: 0px solid #000; width: 100%;}

      body { position: relative; margin: 10px; padding 0px; color: #333; }
      h1 { margin-top: 20px; font: 1.5em Verdana, Arial, Helvetica sans-serif;}
      h2 { margin-top: 10px; font: 0.75em Verdana, Arial, Helvetica sans-serif; text-align: left; }      
      a, a:link, a:visited, a:active { color: red; text-decoration: none; text-transform: uppercase; }
      table { width: 100%; background-color: #0cc; padding: 1px; border: 0px;}
      th { font-size: 0.75em; background-color: #ccc; color: #000; padding-left: 5px; text-align: center; border: 1px solid #ccc; white-space: nowrap; }
      td { font-size: 0.75em; background-color: #fff; white-space: nowrap;}
      td.center { font-size: 0.75em; background-color: #fff; text-align: center; white-space: nowrap;}

      .filterForm { font-size: 0.9em; background-color: #0cc; color: #fff; padding-left: 5px; text-align: left; border:1px solid #0cc; white-space: nowrap;}
      .filterText { font-size: 0.75em; background-color: #fff; color: #000; text-align: left; border: 1px solid #ccc; white-space: nowrap;}      
      .filterButton { font-size: 0.75em; background-color: #06C; color: #fff; padding-left: 5px; padding-right: 5px; text-align: center; border: 1px solid #ccc; width: 100px; white-space: nowrap;}
      -->
    </style>
  </head>
  <body onLoad="javascript:document.logFilterForm.logNameFilter.focus();">
    <% 
      String containsFilter = "Contains";
      String beginsWithFilter = "Begins With";

      String[] logLevels = { "debug", "info", "warn", "error", "fatal", "off" };      

      String targetOperation   = (String)request.getParameter("operation");
      String targetLogger      = (String)request.getParameter("logger");
      String targetLogLevel    = (String)request.getParameter("newLogLevel");
      String logNameFilter     = (String)request.getParameter("logNameFilter");
      String logNameFilterType = (String)request.getParameter("logNameFilterType");
    %>
    <div id="content">
      <h1>Log4J Administration</h1>
      <div class="filterForm">
        <form action="log4jAdmin.jsp" name="logFilterForm">Filter Loggers:  
          <input name="logNameFilter" type="text" size="50" value="<%=(logNameFilter == null ? "":logNameFilter)%>" class="filterText" />
          <input name="logNameFilterType" type="submit" value="<%=beginsWithFilter%>" class="filterButton" /> 
          <input name="logNameFilterType" type="submit" value="<%=containsFilter%>" class="filterButton" />           
          <input name="logNameClear" type="button" value="Clear" class="filterButton" onmousedown='javascript:document.logFilterForm.logNameFilter.value="";' />                    
          <input name="logNameReset" type="reset" value="Reset" class="filterButton" />                              
          <param name="operation" value="changeLogLevel" />
        </form>
      </div>
      <table cellspacing="1">
        <tr>
          <th width="25%">Logger</th>
          <th width="25%">Parent Logger</th>
          <th width="15%">Effective Level</th>
          <th width="35%">Change Log Level To</th>
        </tr>
        <%                    
          Enumeration loggers = LogManager.getCurrentLoggers();
          HashMap loggersMap = new HashMap(128);

          Logger rootLogger = LogManager.getRootLogger();

          if(!loggersMap.containsKey(rootLogger.getName()))
          {
            loggersMap.put(rootLogger.getName(), rootLogger);
          }

          while(loggers.hasMoreElements())
          {
            Logger logger = (Logger)loggers.nextElement();    

            if(logNameFilter == null || logNameFilter.trim().length() == 0)
            {
                loggersMap.put(logger.getName(), logger);                                                
            }
            else if(containsFilter.equals(logNameFilterType))
            {
              if(logger.getName().toUpperCase().indexOf(logNameFilter.toUpperCase()) >= 0)
              {
                loggersMap.put(logger.getName(), logger);                                                                
              }
            }
            else
            {
              // Either was no filter in IF, contains filter in ELSE IF, or begins with in ELSE
              if(logger.getName().startsWith(logNameFilter))
              {
                loggersMap.put(logger.getName(), logger);                                                                
              }              
            }  
          }

          Set loggerKeys = loggersMap.keySet();
          String[] keys = new String[loggerKeys.size()];
          keys = (String[])loggerKeys.toArray(keys);
          Arrays.sort(keys, String.CASE_INSENSITIVE_ORDER);

          for(int i=0; i<keys.length; i++)
          {
            Logger logger = (Logger)loggersMap.get(keys[i]);

            // MUST CHANGE THE LOG LEVEL ON LOGGER BEFORE GENERATING THE LINKS AND THE
            // CURRENT LOG LEVEL OR DISABLED LINK WON'T MATCH THE NEWLY CHANGED VALUES
            if("changeLogLevel".equals(targetOperation) && targetLogger.equals(logger.getName()))
            {
              Logger selectedLogger = (Logger)loggersMap.get(targetLogger);
              selectedLogger.setLevel(Level.toLevel(targetLogLevel));
            }  

            String loggerName = null;
            String loggerEffectiveLevel = null;
            String loggerParent = null;

            if(logger != null)
            {
              loggerName = logger.getName();
              loggerEffectiveLevel = String.valueOf(logger.getEffectiveLevel());
              loggerParent = (logger.getParent() == null ? null : logger.getParent().getName());
            }
        %>

        <tr>
          <td><%=loggerName%></td>
          <td><%=loggerParent%></td>
          <td><%=loggerEffectiveLevel%></td>
          <td class="center">
          <%                            
            for(int cnt=0; cnt<logLevels.length; cnt++)
            {
              String url = "log4jAdmin.jsp?operation=changeLogLevel&logger=" + loggerName + "&newLogLevel=" + logLevels[cnt] + "&logNameFilter=" + (logNameFilter != null ? logNameFilter : "");                                                

              if(logger.getLevel() == Level.toLevel(logLevels[cnt]) || logger.getEffectiveLevel() == Level.toLevel(logLevels[cnt]))
              {
          %>              
                [<%=logLevels[cnt].toUpperCase()%>]                            
          <%                
              }
              else
              {                        
          %>              
                <a href='<%=url%>'>[<%=logLevels[cnt]%>]</a> 
          <%
              }
            }                                                                                
          %>
          </td>
        </tr>
       <% 
         } 
       %>                        
      </table>
      <h2>  
        Page Load Time (Millis): <%=(System.currentTimeMillis() - beginPageLoadTime)%>
      </h2>      
    </div>
  </body>
</html>