htmlFormat

import java.text.SimpleDateFormat;   

import org.apache.log4j.HTMLLayout;   
import org.apache.log4j.Layout;   
import org.apache.log4j.Level;   
import org.apache.log4j.helpers.Transform;   
import org.apache.log4j.spi.LocationInfo;   
import org.apache.log4j.spi.LoggingEvent;   
  
  
public class HtmlLogFormat extends HTMLLayout {   
  
    public HtmlLogFormat() {   
    }   
  
    protected final int BUF_SIZE = 256;   
  
    protected final int MAX_CAPACITY = 1024;   
  
    static String TRACE_PREFIX = "<br>&nbsp;&nbsp;&nbsp;&nbsp;";   
  
    private StringBuffer sbuf = new StringBuffer(BUF_SIZE);   
       
    String title="Automation Log";   
  
    /**  
     * A string constant used in naming the option for setting the the HTML  
     * document title. Current value of this string constant is <b>Title</b>.  
     */  
    public static final String TITLE_OPTION = "Title";   
  
    // Print no location info by default   
    boolean locationInfo = true;   
       
    public String format(LoggingEvent event) {   
        if (sbuf.capacity() > MAX_CAPACITY) {   
            sbuf = new StringBuffer(BUF_SIZE);   
        } else {   
            sbuf.setLength(0);   
        }   
        sbuf.append(Layout.LINE_SEP + "<tr>" + Layout.LINE_SEP);   
                   
        sbuf.append("<td>");   
        sbuf.append(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new java.util.Date()));   
        sbuf.append("</td>" + Layout.LINE_SEP);   
  
        sbuf.append("<td title="Level">");   
        if (event.getLevel().equals(Level.FATAL)) {   
            sbuf.append("<font color="#339933">");   
            sbuf.append(Transform.escapeTags(String.valueOf(event.getLevel())));   
            sbuf.append("</font>");   
        } else if (event.getLevel().isGreaterOrEqual(Level.WARN)) {   
            sbuf.append("<font color="#993300"><strong>");   
            sbuf.append(Transform.escapeTags(String.valueOf(event.getLevel())));   
            sbuf.append("</strong></font>");   
        } else {   
            sbuf.append("<font color="green">");   
            sbuf.append(Transform.escapeTags(String.valueOf(event.getLevel())));   
            sbuf.append("</font>");   
        }   
        sbuf.append("</td>" + Layout.LINE_SEP);   
           
   if (locationInfo) {   
            LocationInfo locInfo = event.getLocationInformation();   
            sbuf.append("<td title="Source">");  
            sbuf.append(Transform.escapeTags(locInfo.getFileName()));  
            sbuf.append(':');  
            sbuf.append(locInfo.getLineNumber());  
            sbuf.append("</td>" + Layout.LINE_SEP);  
        }  
             
          
        sbuf.append("<td title="Message">");   
        sbuf.append(Transform.escapeTags(event.getRenderedMessage()));   
        sbuf.append("</td>" + Layout.LINE_SEP);   
        sbuf.append("</tr>" + Layout.LINE_SEP);   
  
        if (event.getNDC() != null) {   
            sbuf.append("<tr><td bgcolor="#EEEEEE" style="font-size : xx-small;" colspan="6" title="Nested Diagnostic Context">");   
            sbuf.append("NDC: " + Transform.escapeTags(event.getNDC()));   
            sbuf.append("</td></tr>" + Layout.LINE_SEP);   
        }   
  
        String[] s = event.getThrowableStrRep();   
        if (s != null) {   
            sbuf.append("<tr><td bgcolor="#993300" style="color:White; font-size : xx-small;" colspan="4">");   
            appendThrowableAsHTML(s, sbuf);   
            sbuf.append("</td></tr>" + Layout.LINE_SEP);   
        }   
        return sbuf.toString();   
    }   
   
    private void appendThrowableAsHTML(String[] s,StringBuffer sbuf){   
        if (s != null) {   
            int len = s.length;   
            if (len == 0)   
                return;   
            sbuf.append(Transform.escapeTags(s[0]));   
            sbuf.append(Layout.LINE_SEP);   
            for (int i = 1; i < len; i++) {   
                sbuf.append(TRACE_PREFIX);   
                sbuf.append(Transform.escapeTags(s[i]));   
                sbuf.append(Layout.LINE_SEP);   
            }   
        }   
    }   
  
    /**  
     * Returns appropriate HTML headers.  
     */  
    public String getHeader() {   
        StringBuffer sbuf = new StringBuffer();   
        sbuf.append("<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">" + Layout.LINE_SEP);   
        sbuf.append("<html>" + Layout.LINE_SEP);   
        sbuf.append("<head>" + Layout.LINE_SEP);   
        sbuf.append("<meta http-equiv="Content-Type" content="text/html; charset=utf-8">" + Layout.LINE_SEP);   
        sbuf.append("<title>" + title + "</title>" + Layout.LINE_SEP);   
        sbuf.append("<style type="text/css">" + Layout.LINE_SEP);   
        sbuf.append("<!--" + Layout.LINE_SEP);   
        sbuf.append("body, table {font-family: '??',arial,sans-serif; font-size: 12px;}" + Layout.LINE_SEP);   
        sbuf.append("th {background: #336699; color: #FFFFFF; text-align: left;}" + Layout.LINE_SEP);   
        sbuf.append("-->" + Layout.LINE_SEP);   
        sbuf.append("</style>" + Layout.LINE_SEP);   
        sbuf.append("</head>" + Layout.LINE_SEP);   
        sbuf.append("<body bgcolor="#FFFFFF" topmargin="6" leftmargin="6">" + Layout.LINE_SEP);   
    
        sbuf.append("<table cellspacing="0" cellpadding="4" border="1" bordercolor="#224466" width="100%">" + Layout.LINE_SEP);   
        sbuf.append("<tr>" + Layout.LINE_SEP);   
       
        sbuf.append("<th width='120'>Time</th>" + Layout.LINE_SEP);   
        sbuf.append("<th>Level</th>" + Layout.LINE_SEP);   
      
        if (locationInfo) {   
            sbuf.append("<th>Source</th>" + Layout.LINE_SEP);   
        }   
   
        sbuf.append("<th>Message</th>" + Layout.LINE_SEP);   
        sbuf.append("</tr>" + Layout.LINE_SEP);   
        sbuf.append("<br></br>" + Layout.LINE_SEP);   
        return sbuf.toString();   
    }   
  
}