java - 如何在log4j中更改htmllayout

我想更改Java中log4j的htmllayout(第5列-时间，线程，级别，类别，消息)。

我的log4j.properties是:

log4j.rootLogger=DEBUG, Console, File

log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.File=org.apache.log4j.FileAppender
log4j.appender.File.File =${logfilename}

log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p %c %x - %m%n

log4j.appender.File.layout=org.apache.log4j.PatternLayout
log4j.appender.File.layout=org.apache.log4j.HTMLLayout
log4j.appender.FILE.layout.Title=HTML Layout Example
log4j.appender.File.layout.ConversionPattern=%d [%t] %-5p %c %x - %m%n
#[%d{MMM dd HH:mm:ss}] %-5p (%F:%L) - %m%n

log4j.appender.File.Threshold=INFO
log4j.appender.Console.Threshold=DEBUG

我想更改“TIME”列的名称并在此处显示当前时间。
有人可以帮我怎么做吗？

最佳答案

我找到了一个可行的解决方案。

package com.mypackage;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.log4j.spi.LoggingEvent;

/**
 * This HTML Log Formatter is a simple replacement for the standard Log4J HTMLLayout formatter and
 * replaces the default timestamp (milliseconds, relative to the start of the log) with a more readable
 * timestamp (an example of the default format is 2008-11-21-18:35:21.472-0800).
 * */

public class   MyLayout
       extends org.apache.log4j.HTMLLayout

{
// RegEx pattern looks for <tr> <td> nnn...nnn </td> (all whitespace ignored)

private static final String rxTimestamp = "\\s*<\\s*tr\\s*>\\s*<\\s*td\\s*>\\s*(\\d*)\\s*<\\s*/td\\s*>";

//* The timestamp format. The format can be overriden by including the following
  * property in the Log4J configuration file:
  *
  * log4j.appender.<category>.layout.TimestampFormat
  *
  * using the same format string as would be specified with SimpleDateFormat.
  *
  */

private String timestampFormat = "yyyy-MM-dd-HH:mm:ss.SZ"; // Default format. Example: 2008-11-21-18:35:21.472-0800

private SimpleDateFormat sdf = new SimpleDateFormat(timestampFormat);

public MyLayout()
{
super();
}

/** Override HTMLLayout's format() method */

public String format(LoggingEvent event)
{
String record = super.format(event); // Get the log record in the default HTMLLayout format.

Pattern pattern = Pattern.compile(rxTimestamp);  // RegEx to find the default timestamp
Matcher matcher = pattern.matcher(record);

if (!matcher.find()) // If default timestamp cannot be found,
{
return record; // Just return the unmodified log record.
}

StringBuffer buffer = new StringBuffer(record);

buffer.replace(matcher.start(1), // Replace the default timestamp with one formatted as desired.
       matcher.end(1),
       sdf.format(new Date(event.timeStamp)));

return buffer.toString(); // Return the log record with the desired timestamp format.
}

/** Setter for timestamp format. Called if log4j.appender.<category>.layout.TimestampFormat property is specfied */

public void setTimestampFormat(String format)
{
    this.timestampFormat = format;
this.sdf = new SimpleDateFormat(format); // Use the format specified by the TimestampFormat property
}

/** Getter for timestamp format being used. */

public String getTimestampFormat()
{
return this.timestampFormat;
}

}