我已经花了很长时间搜索,因此在将其标记为重复项之前,请先阅读。
我有一个用参数Lambda.handle()
调用的函数(id
)。我想将该ID作为前缀添加到每个日志消息中。每次调用函数时都会更改。因此,我想更新记录器模式以将此ID添加为前缀。
我读过:
以下代码基于log4j2文档。它打印:
INIT MyLogger handle() - id ONE
INIT MyLogger handle() - id TWO
INIT MyLogger handle() - id THR
如果我在第initLoggerConfig("INIT ");
行中添加注释,则会显示:
ERROR StatusLogger No Log4j 2 configuration file found. Using default configuration (logging only errors to the console), or user programmatically provided configurations. Set system property 'log4j2.debug' to show Log4j 2 internal initialization logging. See https://logging.apache.org/log4j/2.x/manual/configuration.html for instructions on how to configure Log4j 2
ONE MyLogger handle() - id ONE
ONE MyLogger handle() - id TWO
ONE MyLogger handle() - id THR
我要打印:
ONE MyLogger handle() - id ONE
TWO MyLogger handle() - id TWO
THR MyLogger handle() - id THR
我是否注释掉ctxLocal = ctx;
无效。
这里是the full log,我将log4j自己的日志记录级别设置为ALL(builder.setStatusLevel(Level.ALL);
)
这是代码
package foobar;
import java.util.Arrays;
import java.util.List;
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.Filter;
import org.apache.logging.log4j.core.Layout;
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.Configurator;
import org.apache.logging.log4j.core.config.LoggerConfig;
import org.apache.logging.log4j.core.config.builder.api.AppenderComponentBuilder;
import org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilder;
import org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilderFactory;
import org.apache.logging.log4j.core.config.builder.impl.BuiltConfiguration;
import org.apache.logging.log4j.core.layout.PatternLayout;
class Lambda {
private static final String LOGGER_NAME = "MyLogger";
private LoggerContext ctx;
public Lambda() {
initLoggerConfig("INIT ");
}
public void handle(String id) {
updateLoggerConfig(id);
Logger logger = LogManager.getLogger(LOGGER_NAME);
logger.error("handle() - id {}", id);
}
private void updateLoggerConfig(String prefix) {
final LoggerContext ctxLocal = (LoggerContext) LogManager.getContext(false);
// ctxLocal = ctx;
Configuration config = ctxLocal.getConfiguration();
Layout<String> layout = PatternLayout.newBuilder().withPattern(prefix + " %c %m\n").withConfiguration(config)
.build();
Appender appender = ConsoleAppender.createDefaultAppenderForLayout(layout);
appender.start();
config.addAppender(appender);
AppenderRef ref = AppenderRef.createAppenderRef("File", null, null);
AppenderRef[] refs = new AppenderRef[] { ref };
LoggerConfig loggerConfig = LoggerConfig.createLogger(false, Level.ALL, getClass().getName(), "true", refs, null,
config, null);
loggerConfig.addAppender(appender, null, null);
config.addLogger(LOGGER_NAME, loggerConfig);
ctxLocal.updateLoggers();
}
void initLoggerConfig(String prefix) {
ConfigurationBuilder<BuiltConfiguration> builder = ConfigurationBuilderFactory.newConfigurationBuilder();
builder.setStatusLevel(Level.ERROR);
builder.setConfigurationName("BuilderTest");
builder.add(builder.newFilter("ThresholdFilter", Filter.Result.ACCEPT, Filter.Result.NEUTRAL).addAttribute("level",
Level.DEBUG));
AppenderComponentBuilder appenderBuilder = builder.newAppender("Stdout", "CONSOLE").addAttribute("target",
ConsoleAppender.Target.SYSTEM_OUT);
appenderBuilder.add(builder.newLayout("PatternLayout").addAttribute("pattern", prefix + " %c %m\n"));
appenderBuilder.add(
builder.newFilter("MarkerFilter", Filter.Result.DENY, Filter.Result.NEUTRAL).addAttribute("marker", "FLOW"));
builder.add(appenderBuilder);
builder.add(builder.newLogger(LOGGER_NAME, Level.ALL).add(builder.newAppenderRef("Stdout"))
.addAttribute("additivity", false));
builder.add(builder.newRootLogger(Level.ERROR).add(builder.newAppenderRef("Stdout")));
ctx = Configurator.initialize(builder.build());
}
}
public class TestMain {
static Lambda lamb = new Lambda();
private static Logger logger = LogManager.getLogger();
public static void main(String[] args) {
Configurator.setLevel(logger.getName(), Level.ALL);
List<String> a = Arrays.asList("ONE ", "TWO ", "THR ");
for (String i : a) {
lamb.handle(i);
}
}
}
答案 0 :(得分:1)
使用D.B建议的查找方法,这就是我的解决方法。
在您的PatternLayout中添加对“变量”的引用,在以下情况下,我将其命名为MyVarialbe(您需要对%X {}使用确切的语法:
appenderBuilder.add(builder.newLayout(“ PatternLayout”) .addAttribute(“ pattern”,“ %X {MyVariable} %msg%n%throwable”)));
稍后在代码中,您可以随时通过以下操作为其设置值:
org.apache.logging.log4j.ThreadContext.put(“ MyVariable”,extraInfo);
以编程方式使用log4j2很复杂。由于我遇到了同样的困难,并且这篇帖子已经发表了3个月,所以希望这个答案对其他人有所帮助。