Log4j2 `HTMLLayout`配置示例

HTMLLayout配置
示例日志语句
Log4j2 HTMLLayout输出

原文： https://howtodoinjava.com/log4j2/log4j2-htmllayout-configuration-example/

此 Log4j2 示例将帮助您使用HTMLLayout配置log4j2.xml文件。 HTMLLayout生成 HTML 页面，并将每个 log 语句添加到表中的一行。

`HTMLLayout`配置

在配置HTMLLayout时，可以使用以下属性：

locationInfo – 如果为true，则将包括位置信息。默认为false。
title – 要包含在文件头中的标题。如果未指定，则使用默认标题。
contentType – 内容类型。默认为“text/html”。
charset – 要使用的字符集。如果未指定，将使用默认值。
fontSize – 文本的字体大小。
font – 用于文本的字体。

我们来看看用于生成基于 HTML 格式的日志文件的不同配置选项。

`log4j2.xml`

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="warn">
    <Properties>
        <Property name="basePath">C:\\logs</Property>
    </Properties>
    <Appenders>
        <RollingFile name="fileLogger" fileName="${basePath}/app-info.html" 
                     filePattern="${basePath}/app-info-%d{yyyy-MM-dd}.html">
            <HTMLLayout charset="UTF-8" title="Howtodoinjava Info Logs" locationInfo="true" />
            <Policies>
                <TimeBasedTriggeringPolicy interval="1" modulate="true" />
                <SizeBasedTriggeringPolicy size="10 MB" />
            </Policies>
        </RollingFile>
        <Console name="console" target="SYSTEM_OUT">
            <PatternLayout   pattern="[%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %c{1} - %msg%n" />
        </Console>
    </Appenders>
    <Loggers>
        <Logger name="com.howtodoinjava" level="debug" additivity="false">
            <appender-ref ref="fileLogger" level="debug" />
        </Logger>
        <Root level="debug" additivity="false">
            <appender-ref ref="console" />
        </Root>
    </Loggers>
</Configuration>

`log4j2.properties`

status = error
name = PropertiesConfig
#Make sure to change log file path as per your need
property.filename = C:\\logs\\app-info.html
filters = threshold
filter.threshold.type = ThresholdFilter
filter.threshold.level = debug
appenders = rolling
appender.rolling.type = RollingFile
appender.rolling.name = RollingFile
appender.rolling.fileName = ${filename}
appender.rolling.filePattern = debug-backup-%d{MM-dd-yy-HH-mm-ss}-%i.html.gz
appender.rolling.layout.type = HTMLLayout
appender.rolling.layout.charset = UTF-8
appender.rolling.layout.title = Howtodoinjava Info Logs
appender.rolling.layout.locationInfo = true
appender.rolling.policies.type = Policies
appender.rolling.policies.time.type = TimeBasedTriggeringPolicy
appender.rolling.policies.time.interval = 1
appender.rolling.policies.time.modulate = true
appender.rolling.policies.size.type = SizeBasedTriggeringPolicy
appender.rolling.policies.size.size=10MB
appender.rolling.strategy.type = DefaultRolloverStrategy
appender.rolling.strategy.max = 20
loggers = rolling
#Make sure to change the package structure as per your application
logger.rolling.name = com.howtodoinjava
logger.rolling.level = debug
logger.rolling.additivity = false
logger.rolling.appenderRef.rolling.ref = RollingFile

`log4j2.json`

{
   "configuration": {
      "name": "Default",
      "appenders": {
         "RollingFile": {
            "name":"File",
            "fileName":"C:/logs/howtodoinjava.html",
            "filePattern":"C:/logs/howtodoinjava-backup-%d{MM-dd-yy-HH-mm-ss}-%i.html.gz",
            "HTMLLayout": {
               "charset":"UTF-8",
               "title":"Howtodoinjava Info Logs",
               "locationInfo":"true"
            },
            "Policies": {
               "SizeBasedTriggeringPolicy": {
                  "size":"10 MB"
               }
            },
            "DefaultRolloverStrategy": {
               "max":"10"
            }
         }
      },
      "loggers": {
         "root": {
            "level":"debug",
            "appender-ref": {
              "ref":"File"
            }
         }
      }
   }
}

示例日志语句

现在，我们使用圆顶日志语句生成日志文件。

package com.howtodoinjava.log4j2.examples;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
public class Log4j2HelloWorldExample 
{
    private static final Logger LOGGER = LogManager.getLogger(Log4j2HelloWorldExample.class.getName());
    public static void main(String[] args) 
    {
        LOGGER.debug("Debug Message Logged !!");
        LOGGER.info("Info Message Logged !!");
        LOGGER.debug("Another Debug Message !!");
    }
}