如何纯粹以编程方式配置log4j 2.x？
如何使用console appender编程方式配置log4j 2.3 （没有任何格式的配置文件）？
基本上我在寻找这个1.x代码的 2.x版本。
在我的课程中，我会使用
private static final Logger logger = LogManager.getLogger(); // // some method logger.debug(someString);
没有任何配置，我（正如预期）面对
ERROR StatusLogger未找到log4j2配置文件。 使用默认配置：仅将错误记录到控制台。
虽然配置文件的使用似乎得到了适当的记录 ，但我找不到一个只有裸机代码的好例子。
我得到的最接近的是这篇文章仍然使用虚拟文件。
这是我最好的（虽然完全不成功）拍摄：
private static void configureLog4J() { PatternLayout layout = PatternLayout.createDefaultLayout(); ConsoleAppender appender = ConsoleAppender.createDefaultAppenderForLayout(layout); LoggerConfig loggerConfig = new LoggerConfig(); loggerConfig.addAppender(appender, DEBUG, null); }
我错过了什么吗？
如果它仍然是RTFM案例，请指出我正确的方向。
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"); } }
不确定这是否是您正在寻找的。 这将创建默认配置并添加控制台记录器。 但是，LogManager.getLogger（）不起作用并使用LogManager.getContext（）。getLogger（）不允许记录器层次结构。 老实说，我不建议采用程序化方法，Log4j2对它过敏。
以下是log4j 2.8编程配置的完整示例。 它有3个appender：RollingFile，JDBC和SMTP。
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。
第1类：MPLoggingConfiguration
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 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 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); } } } } }
配置文件：src / main / resources / log4j2.component.properties
log4j.configurationFactory=com.websitester.config.MPLoggingConfiguration$MPConfigurationFactory log4j.configurationFile=log4j2websitester.json
配置文件：src / main / resources / log4j2websitester.json
{"logFilePath" : "/log/weblogic/wl-moniport/"}
在我的例子中，我在其他类中设置了所有属性（通过System.getProperty在MPLoggingConfiguration中访问），例如：
System.setProperty("log4jjdbcjndiName", "weblogic-monitor");
当您更改某些属性并想要重新配置log4j2时，您必须进行以下调用：
final LoggerContext ctx = (LoggerContext) LogManager.getContext(false); ctx.reconfigure();
希望这可以帮助
您可以在log4j中自定义您自己的ConfigurationFactory。 请参阅https://logging.apache.org/log4j/2.x/manual/customconfig.html 。 它似乎可以满足您的需求。
对不起。 这种方式满足您的需求吗？ 我只是测试，它运行良好，即使它仍然输出您上面提到的错误消息。
LoggerContext ctx = (LoggerContext) LogManager.getContext(false); final Configuration config = ctx.getConfiguration(); Layout 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");
如果你想要它用于控制台appender，有一个非常简单的方法，如果你使用maven，只需将这两个依赖项放在你的pom.xml中，所有的东西都将打印在你的控制台上。 什么都不需要……根本没有log4j.properties文件。 slf4j扩展了log4j并具有许多丰富的function。
org.slf4j slf4j-api 1.7.5 compile org.slf4j slf4j-simple 1.7.5