我正在开发一个与许多设备通信的java应用程序。对于每个设备，我需要创建一个不同的日志文件来记录它与设备的通信。这是我开发的包装类。它创建两个日志文件，但数据仅写入第一个日志文件。第二个文件已创建，但未向其中写入任何内容。应发送到第二个文件的输出将发送到控制台。如果我在构造函数中取消注释 createRootLogger() ，则不会将任何内容写入这两个文件，所有内容都会转到控制台。我已经阅读了 log4j2 文档，但它写得很差，代码示例很少。这是我的包装类，错误在哪里？我正在使用 log4j-api-2.9.0.jar 和 log4j-core-2.9.0.jar。
package xyz;
import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.core.Logger;
import org.apache.logging.log4j.core.LoggerContext;
import org.apache.logging.log4j.core.appender.ConsoleAppender;
import org.apache.logging.log4j.core.config.Configuration;
import org.apache.logging.log4j.core.config.Configurator;
import org.apache.logging.log4j.core.config.builder.api.*;
import java.util.Hashtable;
public class LogManager
{
static protected LogManager m_clsInstance = null;
protected Hashtable<String, Logger> m_clsLoggers = new Hashtable<String, Logger>();
private LogManager()
{
//createRootLogger();
}
/**
* getInstance is used to get reference to the singalton class obj ......
*/
static synchronized public LogManager getInstance()
{
try
{
if (m_clsInstance == null)
{
m_clsInstance = new LogManager();
//Configurator.setRootLevel(Level.TRACE);
}
}
catch (Exception xcpE)
{
System.err.println(xcpE);
}
return m_clsInstance;
}
static public Logger getLogger(String sLogger)
{
try
{
return getInstance().m_clsLoggers.get(sLogger);
}
catch (Exception xcpE)
{
System.err.println(xcpE);
}
return null;
}
public Logger createLogger(String strName, String sPath, int nBackupSize, long lngMaxSize, String strPattern, String strLevel)
{
try
{
ConfigurationBuilder builder = ConfigurationBuilderFactory.newConfigurationBuilder();
builder.setStatusLevel(Level.getLevel(strLevel));
builder.setConfigurationName("RollingBuilder"+strName);
// create a console appender
AppenderComponentBuilder appenderBuilder = builder.newAppender("Stdout", "CONSOLE").addAttribute("target",
ConsoleAppender.Target.SYSTEM_OUT);
appenderBuilder.add(builder.newLayout("PatternLayout")
.addAttribute("pattern", strPattern));
builder.add( appenderBuilder );
// create a rolling file appender
LayoutComponentBuilder layoutBuilder = builder.newLayout("PatternLayout")
.addAttribute("pattern", strPattern);
ComponentBuilder triggeringPolicy = builder.newComponent("Policies")
// .addComponent(builder.newComponent("CronTriggeringPolicy").addAttribute("schedule", "0 0 0 * * ?"))
.addComponent(builder.newComponent("SizeBasedTriggeringPolicy").addAttribute("size", lngMaxSize));
appenderBuilder = builder.newAppender("rolling"+strName, "RollingFile")
.addAttribute("fileName", sPath)
.addAttribute("filePattern", "d:\\trash\\archive\\rolling-%d{MM-dd-yy}.log.gz")
.add(layoutBuilder)
.addComponent(triggeringPolicy);
builder.add(appenderBuilder);
// create the new logger
builder.add( builder.newLogger( strName, Level.getLevel(strLevel) )
.add( builder.newAppenderRef( "rolling"+strName ) )
.addAttribute( "additivity", false ) );
Configuration clsCnfg = (Configuration) builder.build();
LoggerContext ctx = Configurator.initialize(clsCnfg);
Logger clsLogger = ctx.getLogger(strName);
m_clsLoggers.put(strName, clsLogger);
return clsLogger;
}
catch (Exception xcpE)
{
System.err.println(xcpE);
}
return null;
}
protected void createRootLogger()
{
try
{
ConfigurationBuilder builder = ConfigurationBuilderFactory.newConfigurationBuilder();
builder.setStatusLevel(Level.getLevel("TRACE"));
builder.setConfigurationName("rootConfig");
// create a console appender
AppenderComponentBuilder appenderBuilder = builder.newAppender("Stdout", "CONSOLE").addAttribute("target",
ConsoleAppender.Target.SYSTEM_OUT);
appenderBuilder.add(builder.newLayout("PatternLayout")
.addAttribute("pattern", "[%d{yyyy-MMM-dd HH:mm:ss:SSS}][%-5p %l][%t] %m%n"));
builder.add( appenderBuilder );
builder.add( builder.newRootLogger( Level.getLevel("TRACE"))
.add( builder.newAppenderRef( "Stdout") ) );
Configuration clsCnfg = (Configuration) builder.build();
LoggerContext ctx = Configurator.initialize(clsCnfg);
Logger clsLogger = ctx.getRootLogger();
m_clsLoggers.put("root", clsLogger);
}
catch (Exception xcpE)
{
System.err.println(xcpE);
}
}
static public void main(String args[])
{
//Logger clsLogger = setLogger();
Logger clsLogger = Emflex.LogManager.getInstance().createLogger(
"AnsiAmrController_" + 5555,
"d:\\trash\\LogManagerTest5555.log",
10,
100000000,
"[%d{yyyy-MMM-dd HH:mm:ss:SSS}][%-5p %l][%t] %m%n",
"TRACE"
);
Logger clsLogger2 = Emflex.LogManager.getInstance().createLogger(
"AnsiAmrController_" + 6666,
"d:\\trash\\LogManagerTest6666.log",
10,
100000000,
"[%d{yyyy-MMM-dd HH:mm:ss:SSS}][%-5p %l][%t] %m%n",
"TRACE"
);
for (int i=0;i<100;i++)
{
clsLogger.error("Testing - ["+i+"]");
clsLogger2.error("Testing - ["+(i*i)+"]");
}
}
}
最佳答案
你说你的目标是:
For each device I need to create a different log file to log it's communication with device.
有许多不同的方法可以无需编程配置来实现此目的。编程配置很糟糕，因为它迫使您依赖日志记录实现而不是公共(public)接口(interface)。
例如，您可以使用 context map键与 Routing Appender 结合使用分离你的日志，类似于我在 another answer 中给出的示例。请注意，在另一个答案中，我使用变量作为存储日志的文件夹，但如果您愿意，可以将其用作日志名称。
做你想做的事情的另一种方法是使用 MapMessage如log4j2 manual所示.
另一种方法是使用 markers与 RoutingAppender 结合使用。以下是此方法的一些示例代码:
package example;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.Marker;
import org.apache.logging.log4j.MarkerManager;
public class LogLvlByMarkerMain {
private static final Logger log = LogManager.getLogger();
private static final Marker DEVICE1 = MarkerManager.getMarker("DEVICE1");
private static final Marker DEVICE2 = MarkerManager.getMarker("DEVICE2");
public static void main(String[] args) {
log.info(DEVICE1, "The first device got some input");
log.info(DEVICE2, "The second device now has input");
}
}
配置:
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
<Appenders>
<Routing name="MyRoutingAppender">
<Routes pattern="$${marker:}">
<Route>
<File
fileName="logs/${marker:}.txt"
name="appender-${marker:}">
<PatternLayout>
<Pattern>[%date{ISO8601}][%-5level][%t] %m%n</Pattern>
</PatternLayout>
</File>
</Route>
</Routes>
</Routing>
<Console name="STDOUT" target="SYSTEM_OUT">
<PatternLayout pattern="[%date{ISO8601}][%-5level][%t] %m%n" />
</Console>
</Appenders>
<Loggers>
<Logger name="example" level="TRACE" additivity="false">
<AppenderRef ref="STDOUT" />
<AppenderRef ref="MyRoutingAppender" />
</Logger>
<Root level="WARN">
<AppenderRef ref="STDOUT" />
</Root>
</Loggers>
</Configuration>
输出:
这将生成 2 个日志文件 - DEVICE1.txt 和 DEVICE2.txt，如下图所示。
第一个日志将仅包含标记为 DEVICE1 的消息，第二个日志将仅包含 DEVICE2 日志。
即第一个日志包含:
[2017-09-21T09:52:04,171][INFO ][main] The first device got some input
第二个包含:
[2017-09-21T09:52:04,176][INFO ][main] The second device now has input
关于java - 如何在log4j2中以编程方式创建多个日志文件？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/46336225/