blocks|key|2696695|text|您可以在log4j中自定义自己的ConfigurationFactory。请参考https://logging.apache.org/log4j/2.x/manual/customconfig.html。看起来它能满足你的需要。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2696696|2696697|很抱歉。这种方式能满足你的需要吗？我刚刚测试了一下，它运行得很好，尽管它仍然输出你上面提到的错误消息。|2696698|++++LoggerContext+ctx+=+(LoggerContext)+LogManager.getContext(false);
++++final+Configuration+config+=+ctx.getConfiguration();
++++Layout<?+extends+Serializable>+layout+=+PatternLayout.createLayout(PatternLayout.SIMPLE_CONVERSION_PATTERN,+config,+null,
++++++++null,true,+true,null,null);

++++Appender+appender+=+FileAppender.createAppender("/tmp/log4jtest.txt",+"false",+"false",+"File",+"true",
++++++++"false",+"false",+"4000",+layout,+null,+"false",+null,+config);
++++appender.start();
++++config.addAppender(appender);
++++AppenderRef+ref+=+AppenderRef.createAppenderRef("File",+null,+null);
++++AppenderRef[]+refs+=+new+AppenderRef[]+{ref};
++++LoggerConfig+loggerConfig+=+LoggerConfig.createLogger("false",+Level.INFO,+"org.apache.logging.log4j",
++++++++"true",+refs,+null,+config,+null+);
++++loggerConfig.addAppender(appender,+null,+null);
++++config.addLogger("simpleTestLogger",+loggerConfig);
++++ctx.updateLoggers();


++++Logger+l+=+ctx.getLogger("simpleTestLogger");
++++l.info("message+of+info+level+shoud+be+output+properly");
++++l.error("error+message");|code-block|syntax|javascript|2696699|entityMap|0|LINK|mutability|MUTABLE|url|https://logging.apache.org/log4j/2.x/manual/customconfig.html^0|14|1P|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|D|3|-4|5|6|7|X|8|@]|9|@]|C|$]]|$1|E|3|F|5|6|7|Y|8|@]|9|@]|C|$]]|$1|G|3|H|5|I|7|Z|8|@]|9|@]|C|$J|K]]|$1|L|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|M|$N|$5|O|P|Q|C|$R|S]]]]

You Can customize your own ConfigurationFactory in log4j.
Pls refer to <a href="https://logging.apache.org/log4j/2.x/manual/customconfig.html" rel="nofollow">https://logging.apache.org/log4j/2.x/manual/customconfig.html</a>. It seems it can meet your need. 

<hr>

Sorry for that. Does this way meet your need? I just test, and it runs well even though it still outputs the error message you mentioned above.

<pre><code> LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
 final Configuration config = ctx.getConfiguration();
 Layout&lt;? extends Serializable&gt; layout = PatternLayout.createLayout(PatternLayout.SIMPLE_CONVERSION_PATTERN, config, null,
 null,true, true,null,null);

 Appender appender = FileAppender.createAppender("/tmp/log4jtest.txt", "false", "false", "File", "true",
 "false", "false", "4000", layout, null, "false", null, config);
 appender.start();
 config.addAppender(appender);
 AppenderRef ref = AppenderRef.createAppenderRef("File", null, null);
 AppenderRef[] refs = new AppenderRef[] {ref};
 LoggerConfig loggerConfig = LoggerConfig.createLogger("false", Level.INFO, "org.apache.logging.log4j",
 "true", refs, null, config, null );
 loggerConfig.addAppender(appender, null, null);
 config.addLogger("simpleTestLogger", loggerConfig);
 ctx.updateLoggers();


 Logger l = ctx.getLogger("simpleTestLogger");
 l.info("message of info level shoud be output properly");
 l.error("error message");
</code></pre>

blocks|key|132000|text|package+com;

import+org.apache.logging.log4j.Level;
import+org.apache.logging.log4j.LogManager;
import+org.apache.logging.log4j.Logger;
import+org.apache.logging.log4j.core.Appender;
import+org.apache.logging.log4j.core.LoggerContext;
import+org.apache.logging.log4j.core.appender.ConsoleAppender;
import+org.apache.logging.log4j.core.config.AppenderRef;
import+org.apache.logging.log4j.core.config.Configuration;
import+org.apache.logging.log4j.core.config.LoggerConfig;
import+org.apache.logging.log4j.core.layout.PatternLayout;

import+java.nio.charset.Charset;

public+class+MyLoggerTest++{

++++public+static+void+main(String[]+args){
++++++++LoggerContext+context=+(LoggerContext)+LogManager.getContext();
++++++++Configuration+config=+context.getConfiguration();

++++++++PatternLayout+layout=+PatternLayout.createLayout("%25m%25n",+null,+null,+Charset.defaultCharset(),false,false,null,null);
++++++++Appender+appender=ConsoleAppender.createAppender(layout,+null,+null,+"CONSOLE_APPENDER",+null,+null);
++++++++appender.start();
++++++++AppenderRef+ref=+AppenderRef.createAppenderRef("CONSOLE_APPENDER",null,null);
++++++++AppenderRef[]+refs+=+new+AppenderRef[]+{ref};
++++++++LoggerConfig+loggerConfig=+LoggerConfig.createLogger("false",+Level.INFO,"CONSOLE_LOGGER","com",refs,null,null,null);
++++++++loggerConfig.addAppender(appender,null,null);

++++++++config.addAppender(appender);
++++++++config.addLogger("com",+loggerConfig);
++++++++context.updateLoggers(config);

++++++++Logger+logger=LogManager.getContext().getLogger("com");
++++++++logger.info("HELLO_WORLD");


++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|132001|不确定这是否是你要找的。这将创建一个默认配置并添加一个控制台记录器。但是，LogManager.getLogger()不起作用，并且使用LogManager.getContext().getLogger()不允许记录器层次结构。老实说，我不推荐程序化的方法，Log4j2对此很敏感。|unstyled|132002|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>package com;

import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.Appender;
import org.apache.logging.log4j.core.LoggerContext;
import org.apache.logging.log4j.core.appender.ConsoleAppender;
import org.apache.logging.log4j.core.config.AppenderRef;
import org.apache.logging.log4j.core.config.Configuration;
import org.apache.logging.log4j.core.config.LoggerConfig;
import org.apache.logging.log4j.core.layout.PatternLayout;

import java.nio.charset.Charset;

public class MyLoggerTest {

 public static void main(String[] args){
 LoggerContext context= (LoggerContext) LogManager.getContext();
 Configuration config= context.getConfiguration();

 PatternLayout layout= PatternLayout.createLayout("%m%n", null, null, Charset.defaultCharset(),false,false,null,null);
 Appender appender=ConsoleAppender.createAppender(layout, null, null, "CONSOLE_APPENDER", null, null);
 appender.start();
 AppenderRef ref= AppenderRef.createAppenderRef("CONSOLE_APPENDER",null,null);
 AppenderRef[] refs = new AppenderRef[] {ref};
 LoggerConfig loggerConfig= LoggerConfig.createLogger("false", Level.INFO,"CONSOLE_LOGGER","com",refs,null,null,null);
 loggerConfig.addAppender(appender,null,null);

 config.addAppender(appender);
 config.addLogger("com", loggerConfig);
 context.updateLoggers(config);

 Logger logger=LogManager.getContext().getLogger("com");
 logger.info("HELLO_WORLD");


 }
}
</code></pre>

Not sure if this is what you are looking for. This creates a default configuration and adds a console logger. However, LogManager.getLogger() does not work and using the LogManager.getContext().getLogger() does not allow for logger hierarchy. Honestly i don't recommend the programmatic approach, Log4j2 is allergic to it.

blocks|key|132004|text|如果你想要它作为控制台附加器，如果你使用maven，有一个非常简单的方法，只要把这两个依赖项放在你的pom.xml中，所有的东西都会在你的控制台上打印出来。根本不需要...no+log4j.properties文件。slf4j扩展了log4j，拥有如此丰富的特性。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|132005|++++++++++<dependency>
+++++++++++++++++<groupId>org.slf4j</groupId>
+++++++++++++++++<artifactId>slf4j-api</artifactId>
+++++++++++++++++<version>1.7.5</version>
+++++++++++++++++<scope>compile</scope>
++++++++++</dependency>

++++++++++<dependency>
+++++++++++++++++<groupId>org.slf4j</groupId>
+++++++++++++++++<artifactId>slf4j-simple</artifactId>
+++++++++++++++++<version>1.7.5</version>
++++++++++</dependency>|code-block|syntax|javascript|132006|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

if you want it for console appender , there is an very easy way if you are using maven, just put these 2 dependencies in your pom.xml and all things will be printed on ur console . nothing needed ...no log4j.properties file at all. slf4j extends log4j and has so many rich features.

<pre><code> &lt;dependency&gt;
 &lt;groupId&gt;org.slf4j&lt;/groupId&gt;
 &lt;artifactId&gt;slf4j-api&lt;/artifactId&gt;
 &lt;version&gt;1.7.5&lt;/version&gt;
 &lt;scope&gt;compile&lt;/scope&gt;
 &lt;/dependency&gt;

 &lt;dependency&gt;
 &lt;groupId&gt;org.slf4j&lt;/groupId&gt;
 &lt;artifactId&gt;slf4j-simple&lt;/artifactId&gt;
 &lt;version&gt;1.7.5&lt;/version&gt;
 &lt;/dependency&gt;
</code></pre>

blocks|key|2696745|text|这是一个完整的log4j+2.8编程配置示例。它有3个附加器:+RollingFile，JDBC和SMTP。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2696746|有1个类和2个属性配置文件，一个用于将类注册为log4j2+configurationFactory，另一个用于设置属性，如日志文件目录。|2696747|类#1:+MPLoggingConfiguration|2696748|package+com.websitester.config;

import+java.io.Serializable;
import+java.nio.charset.Charset;
import+java.util.zip.Deflater;

import+org.apache.logging.log4j.Level;
import+org.apache.logging.log4j.core.Appender;
import+org.apache.logging.log4j.core.Layout;
import+org.apache.logging.log4j.core.LoggerContext;
import+org.apache.logging.log4j.core.appender.RollingFileAppender;
import+org.apache.logging.log4j.core.appender.SmtpAppender;
import+org.apache.logging.log4j.core.appender.db.ColumnMapping;
import+org.apache.logging.log4j.core.appender.db.jdbc.ColumnConfig;
import+org.apache.logging.log4j.core.appender.db.jdbc.ConnectionSource;
import+org.apache.logging.log4j.core.appender.db.jdbc.DataSourceConnectionSource;
import+org.apache.logging.log4j.core.appender.db.jdbc.JdbcAppender;
import+org.apache.logging.log4j.core.appender.rolling.CompositeTriggeringPolicy;
import+org.apache.logging.log4j.core.appender.rolling.DefaultRolloverStrategy;
import+org.apache.logging.log4j.core.appender.rolling.OnStartupTriggeringPolicy;
import+org.apache.logging.log4j.core.appender.rolling.SizeBasedTriggeringPolicy;
import+org.apache.logging.log4j.core.appender.rolling.TriggeringPolicy;
import+org.apache.logging.log4j.core.config.AppenderRef;
import+org.apache.logging.log4j.core.config.Configuration;
import+org.apache.logging.log4j.core.config.ConfigurationFactory;
import+org.apache.logging.log4j.core.config.ConfigurationSource;
import+org.apache.logging.log4j.core.config.DefaultConfiguration;
import+org.apache.logging.log4j.core.config.LoggerConfig;
import+org.apache.logging.log4j.core.config.Order;
import+org.apache.logging.log4j.core.config.Property;
import+org.apache.logging.log4j.core.config.plugins.Plugin;
import+org.apache.logging.log4j.core.layout.HtmlLayout;
import+org.apache.logging.log4j.core.layout.PatternLayout;

public+class+MPLoggingConfiguration+{

++++public+static+final+String+WEBSITESTER_LOGGER_NAME+=+"com.websitester";
++++public+static+final+String+FILE_PATTERN_LAYOUT+=+"%25n[%25d{yyyy-MM-dd+HH:mm:ss}]+[%25-5p]+[%25l]%25n\t%25m%25n%25n";
++++public+static+final+String+LOG_FILE_NAME+=+"awmonitor.log";
++++public+static+final+String+LOG_FILE_NAME_PATTERN+=+"awmonitor-%25i.log";++

++++/**
+++++*+Just+to+make+JVM+visit+this+class+to+initialize+the+static+parts.
+++++*/
++++public+static+void+configure()+{
++++}

++++@Plugin(category+=+ConfigurationFactory.CATEGORY,+name+=+"MPConfigurationFactory")
++++@Order(15)
++++public+static+class+MPConfigurationFactory++extends+ConfigurationFactory+{
++++++++public+static+final+String[]+SUFFIXES+=+new+String[]+{".json",+"*"};

++++++++@Override
++++++++protected+String[]+getSupportedTypes()+{
++++++++++++return+SUFFIXES;
++++++++}

++++++++@Override
++++++++public+Configuration+getConfiguration(LoggerContext+arg0,+ConfigurationSource+arg1)+{
++++++++++++return+new+Log4j2Configuration(arg1);
++++++++}
++++}

++++private+static+class+Log4j2Configuration+extends+DefaultConfiguration+{

++++++++public+Log4j2Configuration(ConfigurationSource+source)+{
++++++++++++super.doConfigure();
++++++++++++setName("mp-log4j2");

++++++++++++String+logFilePath+=+"/log/weblogic/wl-moniport/";

++++++++++++//+LOGGERS
++++++++++++//++++++com.websitester
++++++++++++AppenderRef[]+refs+=+new+AppenderRef[]+{};
++++++++++++Property[]+properties+=+new+Property[]+{};
++++++++++++LoggerConfig+websitesterLoggerConfig+=+LoggerConfig.createLogger(true,+Level.INFO,+WEBSITESTER_LOGGER_NAME,+"true",+refs,+properties,+this,+null);
++++++++++++addLogger(WEBSITESTER_LOGGER_NAME,+websitesterLoggerConfig);


++++++++++++//+APPENDERS
++++++++++++final+Charset+charset+=+Charset.forName("UTF-8");

++++++++++++//++++++MP+ROLLING+FILE
++++++++++++TriggeringPolicy+mpFileCompositePolicy+=+CompositeTriggeringPolicy.createPolicy(
++++++++++++++++++++SizeBasedTriggeringPolicy.createPolicy("3+M"),
++++++++++++++++++++OnStartupTriggeringPolicy.createPolicy(1));
++++++++++++final+DefaultRolloverStrategy+mpFileRolloverStrategy+=+DefaultRolloverStrategy.createStrategy("9",+"1",+"max",+Deflater.NO_COMPRESSION+%2B+"",+null,+true,+this);
++++++++++++Layout<?+extends+Serializable>+mpFileLayout+=+PatternLayout.newBuilder()
++++++++++++++++++++.withPattern(FILE_PATTERN_LAYOUT)
++++++++++++++++++++.withPatternSelector(null)
++++++++++++++++++++.withConfiguration(this)
++++++++++++++++++++.withRegexReplacement(null)
++++++++++++++++++++.withCharset(charset)
++++++++++++++++++++.withAlwaysWriteExceptions(isShutdownHookEnabled)
++++++++++++++++++++.withNoConsoleNoAnsi(isShutdownHookEnabled)
++++++++++++++++++++.withHeader(null)
++++++++++++++++++++.withFooter(null)
++++++++++++++++++++.build();
++++++++++++Appender+mpFileAppender+=+RollingFileAppender.newBuilder()
++++++++++++++++++++.withAdvertise(Boolean.parseBoolean(null))
++++++++++++++++++++.withAdvertiseUri(null)
++++++++++++++++++++.withAppend(true)
++++++++++++++++++++.withBufferedIo(true)
++++++++++++++++++++.withBufferSize(8192)
++++++++++++++++++++.setConfiguration(this)
++++++++++++++++++++.withFileName(logFilePath+%2B+LOG_FILE_NAME)
++++++++++++++++++++.withFilePattern(logFilePath+%2B+LOG_FILE_NAME_PATTERN)
++++++++++++++++++++.withFilter(null)
++++++++++++++++++++.withIgnoreExceptions(true)
++++++++++++++++++++.withImmediateFlush(true)
++++++++++++++++++++.withLayout(mpFileLayout)
++++++++++++++++++++.withCreateOnDemand(false)
++++++++++++++++++++.withLocking(false)
++++++++++++++++++++.withName("error_file_web")
++++++++++++++++++++.withPolicy(mpFileCompositePolicy)
++++++++++++++++++++.withStrategy(mpFileRolloverStrategy)
++++++++++++++++++++.build();
++++++++++++mpFileAppender.start();
++++++++++++addAppender(mpFileAppender);
++++++++++++getLogger(WEBSITESTER_LOGGER_NAME).addAppender(mpFileAppender,+Level.DEBUG,+null);


++++++++++++//+JDBC
++++++++++++if+(System.getProperty("log4jjdbcjndiName")+!=+null){
++++++++++++++++ColumnConfig[]+columnConfigs+=+new+ColumnConfig[]+{
++++++++++++++++++++++++ColumnConfig.newBuilder()
++++++++++++++++++++++++.setConfiguration(this)
++++++++++++++++++++++++.setName("DATED")
++++++++++++++++++++++++.setPattern(null)
++++++++++++++++++++++++.setLiteral(null)
++++++++++++++++++++++++.setEventTimestamp(true)
++++++++++++++++++++++++.setUnicode(false)
++++++++++++++++++++++++.setClob(false)
++++++++++++++++++++++++.build(),
++++++++++++++++++++++++ColumnConfig.newBuilder()
++++++++++++++++++++++++.setConfiguration(this)
++++++++++++++++++++++++.setName("LOGGER")
++++++++++++++++++++++++.setPattern("%25logger")
++++++++++++++++++++++++.setLiteral(null)
++++++++++++++++++++++++.setEventTimestamp(false)
++++++++++++++++++++++++.setUnicode(false)
++++++++++++++++++++++++.setClob(false)
++++++++++++++++++++++++.build(),
++++++++++++++++++++++++ColumnConfig.newBuilder()
++++++++++++++++++++++++.setConfiguration(this)
++++++++++++++++++++++++.setName("LOG_LEVEL")
++++++++++++++++++++++++.setPattern("%25level")
++++++++++++++++++++++++.setLiteral(null)
++++++++++++++++++++++++.setEventTimestamp(false)
++++++++++++++++++++++++.setUnicode(false)
++++++++++++++++++++++++.setClob(false)
++++++++++++++++++++++++.build(),
++++++++++++++++++++++++ColumnConfig.newBuilder()
++++++++++++++++++++++++.setConfiguration(this)
++++++++++++++++++++++++.setName("MESSAGE")
++++++++++++++++++++++++.setPattern("%25message")
++++++++++++++++++++++++.setLiteral(null)
++++++++++++++++++++++++.setEventTimestamp(false)
++++++++++++++++++++++++.setUnicode(false)
++++++++++++++++++++++++.setClob(false)
++++++++++++++++++++++++.build(),
++++++++++++++++++++++++ColumnConfig.newBuilder()
++++++++++++++++++++++++.setConfiguration(this)
++++++++++++++++++++++++.setName("NODE")
++++++++++++++++++++++++.setPattern(""+%2B+System.getProperty("log4jmpserverid"))
++++++++++++++++++++++++.setLiteral(null)
++++++++++++++++++++++++.setEventTimestamp(false)
++++++++++++++++++++++++.setUnicode(false)
++++++++++++++++++++++++.setClob(false)
++++++++++++++++++++++++.build()
++++++++++++++++};
++++++++++++++++ConnectionSource+dataSourceConnectionSource+=+DataSourceConnectionSource.createConnectionSource(System.getProperty("log4jjdbcjndiName"));
++++++++++++++++if+(dataSourceConnectionSource+!=+null){
++++++++++++++++++++Appender+jdbcAppender+=+JdbcAppender.newBuilder()
++++++++++++++++++++++++++++.setBufferSize(0)
++++++++++++++++++++++++++++.setColumnConfigs(columnConfigs)
++++++++++++++++++++++++++++.setColumnMappings(new+ColumnMapping[]{})
++++++++++++++++++++++++++++.setConnectionSource(dataSourceConnectionSource)
++++++++++++++++++++++++++++.setTableName("MTDTLOGS")
++++++++++++++++++++++++++++.withName("databaseAppender")
++++++++++++++++++++++++++++.withIgnoreExceptions(true)
++++++++++++++++++++++++++++.withFilter(null)
++++++++++++++++++++++++++++.build();
++++++++++++++++++++jdbcAppender.start();
++++++++++++++++++++addAppender(jdbcAppender);
++++++++++++++++++++getLogger(WEBSITESTER_LOGGER_NAME).addAppender(jdbcAppender,+Level.WARN,+null);
++++++++++++++++}
++++++++++++};

++++++++++++//+SMTP
++++++++++++if+(System.getProperty("log4jemailSubject")+!=+null){
++++++++++++++++if+(System.getProperty("log4jemailLevel").equalsIgnoreCase("error"))+{
++++++++++++++++++++Layout<?+extends+Serializable>+mpHtmlLayout+=+HtmlLayout.createLayout(false,+"Monitor+de+Portales",+null,+null,+"x-small",+null);

++++++++++++++++++++Appender+smtpAppender+=+SmtpAppender.createAppender(
++++++++++++++++++++++++++++this,
++++++++++++++++++++++++++++"SMTP",
++++++++++++++++++++++++++++System.getProperty("log4jemailTo"),+
++++++++++++++++++++++++++++System.getProperty("log4jemailcc"),+
++++++++++++++++++++++++++++System.getProperty("log4jemailbcc"),+
++++++++++++++++++++++++++++System.getProperty("log4jemailFrom"),+
++++++++++++++++++++++++++++System.getProperty("log4jemailreplyTo"),+
++++++++++++++++++++++++++++System.getProperty("log4jemailSubject"),+
++++++++++++++++++++++++++++System.getProperty("log4jemailProtocol"),+
++++++++++++++++++++++++++++System.getProperty("log4jemailHost"),+
++++++++++++++++++++++++++++System.getProperty("log4jemailPort"),+
++++++++++++++++++++++++++++System.getProperty("log4jemailUserName"),+
++++++++++++++++++++++++++++System.getProperty("log4jemailPassword"),+
++++++++++++++++++++++++++++"false",+
++++++++++++++++++++++++++++"50",+
++++++++++++++++++++++++++++mpHtmlLayout,+
++++++++++++++++++++++++++++null,+
++++++++++++++++++++++++++++"true");
++++++++++++++++++++smtpAppender.start();
++++++++++++++++++++addAppender(smtpAppender);
++++++++++++++++++++getLogger(WEBSITESTER_LOGGER_NAME).addAppender(smtpAppender,+Level.ERROR,+null);
++++++++++++++++}
++++++++++++}
++++++++}
++++}
}|code-block|syntax|javascript|2696749|配置文件:+src/main/resources/log4j2.component.properties|2696750|log4j.configurationFactory=com.websitester.config.MPLoggingConfiguration$MPConfigurationFactory
log4j.configurationFile=log4j2websitester.json|2696751|配置文件:+src/main/resources/log4j2websitester.json|2696752|{"logFilePath"+:+"/log/weblogic/wl-moniport/"}|2696753|在我的例子中，我设置了其他类中的所有属性(在MPLoggingConfiguration中通过System.getProperty访问)，例如：|2696754|System.setProperty("log4jjdbcjndiName",+"weblogic-monitor");|2696755|当您更改了某些属性并希望重新配置log4j2时，您必须进行以下调用：|2696756|final+LoggerContext+ctx+=+(LoggerContext)+LogManager.getContext(false);
ctx.reconfigure();|2696757|希望这能有所帮助|2696758|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|15|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|16|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|17|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|18|8|@]|9|@]|A|$]]|$1|M|3|N|5|H|7|19|8|@]|9|@]|A|$I|J]]|$1|O|3|P|5|6|7|1A|8|@]|9|@]|A|$]]|$1|Q|3|R|5|H|7|1B|8|@]|9|@]|A|$I|J]]|$1|S|3|T|5|6|7|1C|8|@]|9|@]|A|$]]|$1|U|3|V|5|H|7|1D|8|@]|9|@]|A|$I|J]]|$1|W|3|X|5|6|7|1E|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|H|7|1F|8|@]|9|@]|A|$I|J]]|$1|10|3|11|5|6|7|1G|8|@]|9|@]|A|$]]|$1|12|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]]|13|$]]

Here is a complete example for log4j 2.8 programmatically configuration.
It has 3 appenders: RollingFile, JDBC and SMTP.

There are 1 class and 2 properties config files, one for register the class as a log4j2 configurationFactory, and the other one for set properties like the log file directory.

Class #1: MPLoggingConfiguration

<pre><code>package com.websitester.config;

import java.io.Serializable;
import java.nio.charset.Charset;
import java.util.zip.Deflater;

import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.core.Appender;
import org.apache.logging.log4j.core.Layout;
import org.apache.logging.log4j.core.LoggerContext;
import org.apache.logging.log4j.core.appender.RollingFileAppender;
import org.apache.logging.log4j.core.appender.SmtpAppender;
import org.apache.logging.log4j.core.appender.db.ColumnMapping;
import org.apache.logging.log4j.core.appender.db.jdbc.ColumnConfig;
import org.apache.logging.log4j.core.appender.db.jdbc.ConnectionSource;
import org.apache.logging.log4j.core.appender.db.jdbc.DataSourceConnectionSource;
import org.apache.logging.log4j.core.appender.db.jdbc.JdbcAppender;
import org.apache.logging.log4j.core.appender.rolling.CompositeTriggeringPolicy;
import org.apache.logging.log4j.core.appender.rolling.DefaultRolloverStrategy;
import org.apache.logging.log4j.core.appender.rolling.OnStartupTriggeringPolicy;
import org.apache.logging.log4j.core.appender.rolling.SizeBasedTriggeringPolicy;
import org.apache.logging.log4j.core.appender.rolling.TriggeringPolicy;
import org.apache.logging.log4j.core.config.AppenderRef;
import org.apache.logging.log4j.core.config.Configuration;
import org.apache.logging.log4j.core.config.ConfigurationFactory;
import org.apache.logging.log4j.core.config.ConfigurationSource;
import org.apache.logging.log4j.core.config.DefaultConfiguration;
import org.apache.logging.log4j.core.config.LoggerConfig;
import org.apache.logging.log4j.core.config.Order;
import org.apache.logging.log4j.core.config.Property;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.layout.HtmlLayout;
import org.apache.logging.log4j.core.layout.PatternLayout;

public class MPLoggingConfiguration {

 public static final String WEBSITESTER_LOGGER_NAME = "com.websitester";
 public static final String FILE_PATTERN_LAYOUT = "%n[%d{yyyy-MM-dd HH:mm:ss}] [%-5p] [%l]%n\t%m%n%n";
 public static final String LOG_FILE_NAME = "awmonitor.log";
 public static final String LOG_FILE_NAME_PATTERN = "awmonitor-%i.log"; 

 /**
 * Just to make JVM visit this class to initialize the static parts.
 */
 public static void configure() {
 }

 @Plugin(category = ConfigurationFactory.CATEGORY, name = "MPConfigurationFactory")
 @Order(15)
 public static class MPConfigurationFactory extends ConfigurationFactory {
 public static final String[] SUFFIXES = new String[] {".json", "*"};

 @Override
 protected String[] getSupportedTypes() {
 return SUFFIXES;
 }

 @Override
 public Configuration getConfiguration(LoggerContext arg0, ConfigurationSource arg1) {
 return new Log4j2Configuration(arg1);
 }
 }

 private static class Log4j2Configuration extends DefaultConfiguration {

 public Log4j2Configuration(ConfigurationSource source) {
 super.doConfigure();
 setName("mp-log4j2");

 String logFilePath = "/log/weblogic/wl-moniport/";

 // LOGGERS
 // com.websitester
 AppenderRef[] refs = new AppenderRef[] {};
 Property[] properties = new Property[] {};
 LoggerConfig websitesterLoggerConfig = LoggerConfig.createLogger(true, Level.INFO, WEBSITESTER_LOGGER_NAME, "true", refs, properties, this, null);
 addLogger(WEBSITESTER_LOGGER_NAME, websitesterLoggerConfig);


 // APPENDERS
 final Charset charset = Charset.forName("UTF-8");

 // MP ROLLING FILE
 TriggeringPolicy mpFileCompositePolicy = CompositeTriggeringPolicy.createPolicy(
 SizeBasedTriggeringPolicy.createPolicy("3 M"),
 OnStartupTriggeringPolicy.createPolicy(1));
 final DefaultRolloverStrategy mpFileRolloverStrategy = DefaultRolloverStrategy.createStrategy("9", "1", "max", Deflater.NO_COMPRESSION + "", null, true, this);
 Layout&lt;? extends Serializable&gt; mpFileLayout = PatternLayout.newBuilder()
 .withPattern(FILE_PATTERN_LAYOUT)
 .withPatternSelector(null)
 .withConfiguration(this)
 .withRegexReplacement(null)
 .withCharset(charset)
 .withAlwaysWriteExceptions(isShutdownHookEnabled)
 .withNoConsoleNoAnsi(isShutdownHookEnabled)
 .withHeader(null)
 .withFooter(null)
 .build();
 Appender mpFileAppender = RollingFileAppender.newBuilder()
 .withAdvertise(Boolean.parseBoolean(null))
 .withAdvertiseUri(null)
 .withAppend(true)
 .withBufferedIo(true)
 .withBufferSize(8192)
 .setConfiguration(this)
 .withFileName(logFilePath + LOG_FILE_NAME)
 .withFilePattern(logFilePath + LOG_FILE_NAME_PATTERN)
 .withFilter(null)
 .withIgnoreExceptions(true)
 .withImmediateFlush(true)
 .withLayout(mpFileLayout)
 .withCreateOnDemand(false)
 .withLocking(false)
 .withName("error_file_web")
 .withPolicy(mpFileCompositePolicy)
 .withStrategy(mpFileRolloverStrategy)
 .build();
 mpFileAppender.start();
 addAppender(mpFileAppender);
 getLogger(WEBSITESTER_LOGGER_NAME).addAppender(mpFileAppender, Level.DEBUG, null);


 // JDBC
 if (System.getProperty("log4jjdbcjndiName") != null){
 ColumnConfig[] columnConfigs = new ColumnConfig[] {
 ColumnConfig.newBuilder()
 .setConfiguration(this)
 .setName("DATED")
 .setPattern(null)
 .setLiteral(null)
 .setEventTimestamp(true)
 .setUnicode(false)
 .setClob(false)
 .build(),
 ColumnConfig.newBuilder()
 .setConfiguration(this)
 .setName("LOGGER")
 .setPattern("%logger")
 .setLiteral(null)
 .setEventTimestamp(false)
 .setUnicode(false)
 .setClob(false)
 .build(),
 ColumnConfig.newBuilder()
 .setConfiguration(this)
 .setName("LOG_LEVEL")
 .setPattern("%level")
 .setLiteral(null)
 .setEventTimestamp(false)
 .setUnicode(false)
 .setClob(false)
 .build(),
 ColumnConfig.newBuilder()
 .setConfiguration(this)
 .setName("MESSAGE")
 .setPattern("%message")
 .setLiteral(null)
 .setEventTimestamp(false)
 .setUnicode(false)
 .setClob(false)
 .build(),
 ColumnConfig.newBuilder()
 .setConfiguration(this)
 .setName("NODE")
 .setPattern("" + System.getProperty("log4jmpserverid"))
 .setLiteral(null)
 .setEventTimestamp(false)
 .setUnicode(false)
 .setClob(false)
 .build()
 };
 ConnectionSource dataSourceConnectionSource = DataSourceConnectionSource.createConnectionSource(System.getProperty("log4jjdbcjndiName"));
 if (dataSourceConnectionSource != null){
 Appender jdbcAppender = JdbcAppender.newBuilder()
 .setBufferSize(0)
 .setColumnConfigs(columnConfigs)
 .setColumnMappings(new ColumnMapping[]{})
 .setConnectionSource(dataSourceConnectionSource)
 .setTableName("MTDTLOGS")
 .withName("databaseAppender")
 .withIgnoreExceptions(true)
 .withFilter(null)
 .build();
 jdbcAppender.start();
 addAppender(jdbcAppender);
 getLogger(WEBSITESTER_LOGGER_NAME).addAppender(jdbcAppender, Level.WARN, null);
 }
 };

 // SMTP
 if (System.getProperty("log4jemailSubject") != null){
 if (System.getProperty("log4jemailLevel").equalsIgnoreCase("error")) {
 Layout&lt;? extends Serializable&gt; mpHtmlLayout = HtmlLayout.createLayout(false, "Monitor de Portales", null, null, "x-small", null);

 Appender smtpAppender = SmtpAppender.createAppender(
 this,
 "SMTP",
 System.getProperty("log4jemailTo"), 
 System.getProperty("log4jemailcc"), 
 System.getProperty("log4jemailbcc"), 
 System.getProperty("log4jemailFrom"), 
 System.getProperty("log4jemailreplyTo"), 
 System.getProperty("log4jemailSubject"), 
 System.getProperty("log4jemailProtocol"), 
 System.getProperty("log4jemailHost"), 
 System.getProperty("log4jemailPort"), 
 System.getProperty("log4jemailUserName"), 
 System.getProperty("log4jemailPassword"), 
 "false", 
 "50", 
 mpHtmlLayout, 
 null, 
 "true");
 smtpAppender.start();
 addAppender(smtpAppender);
 getLogger(WEBSITESTER_LOGGER_NAME).addAppender(smtpAppender, Level.ERROR, null);
 }
 }
 }
 }
}
</code></pre>

Config file: src/main/resources/log4j2.component.properties

<pre><code>log4j.configurationFactory=com.websitester.config.MPLoggingConfiguration$MPConfigurationFactory
log4j.configurationFile=log4j2websitester.json
</code></pre>

Config file: src/main/resources/log4j2websitester.json

<pre><code>{"logFilePath" : "/log/weblogic/wl-moniport/"}
</code></pre>

In my case, I set all the properties (accessed in MPLoggingConfiguration via System.getProperty) in other classes, for example:

<pre><code>System.setProperty("log4jjdbcjndiName", "weblogic-monitor");
</code></pre>

When you changed some properties and want to reconfigure log4j2, you must make this call:

<pre><code>final LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
ctx.reconfigure();
</code></pre>

Hope this helps

blocks|key|133588|text|documentation推荐使用builder+api进行编程配置。使用此api，您的configureLog4J()方法可能如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|133589|public+static+void+configureLog4J()+{
++ConfigurationBuilder<BuiltConfiguration>+builder+=
++++++ConfigurationBuilderFactory.newConfigurationBuilder();

++//+configure+a+console+appender
++builder.add(
++++++builder.newAppender("stdout",+"Console")
++++++++++.add(
++++++++++++++builder.newLayout(PatternLayout.class.getSimpleName())
++++++++++++++++++.addAttribute(
++++++++++++++++++++++"pattern",
++++++++++++++++++++++"%25d{HH:mm:ss.SSS}+[%25t]+%25-5level+%25logger{36}+-+%25msg%25n"
++++++++++++++++++)
++++++++++)
++);

++//+configure+the+root+logger
++builder.add(
++++++builder.newRootLogger(Level.INFO)
++++++++++.add(builder.newAppenderRef("stdout"))
++);

++//+apply+the+configuration
++Configurator.initialize(builder.build());

}|code-block|syntax|javascript|133590|现在，诀窍是-而手册中并没有清楚地说明-这个静态初始化方法在任何LogManager.getLogger()调用之前被称为。|BOLD|133591|对于最小的工作示例，您可以使用静态初始化块，如下所示|133592|private+static+final+Logger+log;

static+{
++configureLog4J();
++log+=+LogManager.getLogger(MyAwesomeClass.class);
}|133593|也就是说，以编程的方式配置日志记录对于任何非琐碎的项目来说都不是一个好主意:每次您想要临时增加某些日志记录器的日志级别以诊断生产问题时，您都必须重新编译、测试和发布代码。因此，我强烈建议不要使用它。|133594|entityMap|0|LINK|mutability|MUTABLE|url|https://logging.apache.org/log4j/2.x/manual/customconfig.html^0|18|G|0|D|0|0|0|W|M|1P|1|0|0|Q|0|0|0|2R|0^^$0|@$1|2|3|4|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@$9|14|A|15|1|16]]|E|$]]|$1|F|3|G|5|H|7|17|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|18|8|@$9|19|A|1A|B|C]|$9|1B|A|1C|B|M]]|D|@]|E|$]]|$1|N|3|O|5|6|7|1D|8|@$9|1E|A|1F|B|M]]|D|@]|E|$]]|$1|P|3|Q|5|H|7|1G|8|@]|D|@]|E|$I|J]]|$1|R|3|S|5|6|7|1H|8|@$9|1I|A|1J|B|M]]|D|@]|E|$]]|$1|T|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]]|U|$V|$5|W|X|Y|E|$Z|10]]]]

The <a href="https://logging.apache.org/log4j/2.x/manual/customconfig.html" rel="nofollow noreferrer">documentation</a> recommends the builder api for programmatic configuration. Using this api, your <code>configureLog4J()</code> method could look something like this:

<pre><code>public static void configureLog4J() {
 ConfigurationBuilder&lt;BuiltConfiguration&gt; builder =
 ConfigurationBuilderFactory.newConfigurationBuilder();

 // configure a console appender
 builder.add(
 builder.newAppender("stdout", "Console")
 .add(
 builder.newLayout(PatternLayout.class.getSimpleName())
 .addAttribute(
 "pattern",
 "%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"
 )
 )
 );

 // configure the root logger
 builder.add(
 builder.newRootLogger(Level.INFO)
 .add(builder.newAppenderRef("stdout"))
 );

 // apply the configuration
 Configurator.initialize(builder.build());

}
</code></pre>

Now, the trick is - and afaik the manual does not state that clearly enough - that
this static initialization method as to be called prior to any calls of
<code>LogManager.getLogger()</code>.

For a minimal working example, you could use a static initialization block like so

<pre><code>private static final Logger log;

static {
 configureLog4J();
 log = LogManager.getLogger(MyAwesomeClass.class);
}
</code></pre>

That said, configuring logging in a programmatic way is imho not a good idea for any
non trivial project: you would have to recompile, test and ship your code each time
you want to temporarily increase log levels on certain loggers to diagnose
production problems. Therefore I would strongly recommend against using it.

How do I configure <code>log4j 2.3</code> with <a href="https://logging.apache.org/log4j/2.x/manual/appenders.html" rel="noreferrer"><code>console appender</code></a> pure programmatically (no configuration files of any format)?

Basically I'm looking for 2.x version of this <a href="http://tech-lead.blogspot.com/2013/07/how-to-configure-log4j-consoleappender.html" rel="noreferrer">1.x code</a>. 

In my classes I would then use

<pre><code>private static final Logger logger = LogManager.getLogger();
// 
 // some method
 logger.debug(someString);
</code></pre>

Without any configuration I'm (as expected) facing 

<blockquote>
 ERROR StatusLogger No log4j2 configuration file found. Using default configuration: logging only errors to the console.
</blockquote>

While usage of configuration files seems to be <a href="https://logging.apache.org/log4j/2.x/manual/configuration.html" rel="noreferrer">properly documented</a>, I couldn't find a good example of a bare-bone code-only case.

The closest I got is <a href="http://www.journaldev.com/7128/apache-log4j-2-tutorial-configuration-levels-appenders-lookup-layouts-and-filters-example#configuration" rel="noreferrer">this article</a> that still uses a dummy file.

Here's my best (though completely unsuccessful) shot:

<pre><code>private static void configureLog4J() {
 PatternLayout layout = PatternLayout.createDefaultLayout();
 ConsoleAppender appender = ConsoleAppender.createDefaultAppenderForLayout(layout);
 LoggerConfig loggerConfig = new LoggerConfig();
 loggerConfig.addAppender(appender, DEBUG, null);
}
</code></pre>

Have I missed something? 

If it's still a RTFM case, please point me into the right direction.

How to configure log4j 2.x purely programmatically?

日志文件

如何以编程方式使用纯配置log4j 2.3 (没有任何格式的配置文件)？基本上，我正在寻找这个的2.x版本。在我的课堂上，我会使用private static final Logger logger = LogManager.getLogger();//     // some method       logger....

问如何通过纯编程方式配置log4j 2.x？
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