我正在尝试使用log4j2编写一个日志模块，需要将日志以json的形式写入控制台STDOUT。
为此，我尝试使用JSON格式的PatternLayout，如下所示。
我在将值从代码动态传递到log4j2.xml配置文件以在运行时编写日志时替换它们时遇到了一些困难。
我尝试使用StructuredDataMessage和MapMessages来替换https://logging.apache.org/log4j/2.0/manual/lookups.html中提到的Map中的值。
我也试过Stringdom和ContextMaplookup，但到目前为止还没有成功。
下面是我的xml配置

<?xml version="1.0" encoding="UTF-8"?>
    <Configuration status="WARN" name="App" packages="com.test.common.logging">
        <Properties>
            <Property name="filename">target/rolling1/rollingtest.log</Property>
            <Property name="maptype">$${map:type}</Property>
            
        </Properties>
        
        <ThresholdFilter level="debug"/>
      
        <Appenders>
            <Console name="Console" target="SYSTEM_OUT">
              <PatternLayout pattern="%highlight{{'logged time': '%d{dd MMM yyyy HH:mm:ss}', 
            'LEVEL' : '%level',
            'CLASS' : '%c{-1}',
            'Module' : '[%t]',
            'message' : '%m',
            'error' : '%exception',
            'class' : '%C',
            'threadid' : '%tid',
            'threadname' : '%thread',
            'whatisthis' : '${filename}',
            'processid' : '%pid', 
            'logdir' : '$${sd:type}'
            'location' : '${log4j:configLocation}'
            'systemproperty' : '$${ctx:key-}'
            }}%n"/>
            </Console>
        </Appenders>
      
        <Loggers>
            <Root level="trace">
                <AppenderRef ref="Console"/>
            </Root>
        </Loggers>
      
    </Configuration>

字符串
下面是我的代码，我试图通过使用结构化数据消息，strlookup和mapmessage动态值

public class App 
{
    
    
    public static void main( String[] args )
    {
        Logger logger = LogManager.getLogger(App.class);
        
//      ConfigurationBuilder<BuiltConfiguration> builder
//       = ConfigurationBuilderFactory.newConfigurationBuilder();
//      
//      LayoutComponentBuilder standard 
//        = builder.newLayout("PatternLayout");
//      standard.
//      
        System.out.println( "Hello World!" );
        StructuredDataMessage message = new StructuredDataMessage("1", "name", "string");
        message.put("1", "nme");
       // MapMessage mapm = new MapMessage(map)
        MapMessage map = new MapMessage();
        map.put("type", "value");
        map.put("key", "value");
        map.put("name", "arun");
        StrLookup strlook = new StrLookup() {
            
            public String lookup(LogEvent event, String key) {
                // TODO Auto-generated method stub
                return null;
            }
            
            public String lookup(String key) {
                // TODO Auto-generated method stub
                
                return "value";
            }
        };
        ContextMapLookup lookup = new ContextMapLookup();
        System.out.println(lookup.lookup("key"));
        System.out.println(strlook.lookup("key"));
       
       // MapLookup.setMainArguments(args);
        
        System.setProperty("log_dir", App.class.getSimpleName());;
        logger.trace("trace log message");
        logger.debug("Debug log message");
        logger.info("Info log message");
        logger.error("Error log message");
        logger.fatal("Fatal log message");
        logger.info("Info log message[]");
        logger.error("null exception[]", new NullPointerException());
        
        // Lay

    }
}

型
我的输出：

Hello World!
null
value
[36m{'logged time': '24 Aug 2018 12:32:51',    'LEVEL' : 'DEBUG',   'CLASS' : 'test.common.logging.App',   'Module' : '[main]',   'message' : 'Debug log message',   'error' : '',   'class' : 'com.test.common.logging.App',   'threadid' : '1',   'threadname' : 'main',   'whatisthis' : 'target/rolling1/rollingtest.log',   'processid' : 'DEBUGid',    'logdir' : '${sd:type}'   'location' : '/Users/parunkarthick/ferry-commons/common/logging/target/classes/log4j2.xml'   'systemproperty' : '${ctx:key}'   [m}
[32m{'logged time': '24 Aug 2018 12:32:51',    'LEVEL' : 'INFO',   'CLASS' : 'test.common.logging.App',   'Module' : '[main]',   'message' : 'Info log message',   'error' : '',   'class' : 'com.test.common.logging.App',   'threadid' : '1',   'threadname' : 'main',   'whatisthis' : 'target/rolling1/rollingtest.log',   'processid' : 'INFOid',    'logdir' : '${sd:type}'   'location' : '/Users/parunkarthick/ferry-commons/common/logging/target/classes/log4j2.xml'   'systemproperty' : '${ctx:key}'   [m}
[1;31m{'logged time': '24 Aug 2018 12:32:51',    'LEVEL' : 'ERROR',   'CLASS' : 'test.common.logging.App',   'Module' : '[main]',   'message' : 'Error log message',   'error' : '',   'class' : 'com.test.common.logging.App',   'threadid' : '1',   'threadname' : 'main',   'whatisthis' : 'target/rolling1/rollingtest.log',   'processid' : 'ERRORid',    'logdir' : '${sd:type}'   'location' : '/Users/parunkarthick/ferry-commons/common/logging/target/classes/log4j2.xml'   'systemproperty' : '${ctx:key}'   [m}
[1;31m{'logged time': '24 Aug 2018 12:32:51',    'LEVEL' : 'FATAL',   'CLASS' : 'test.common.logging.App',   'Module' : '[main]',   'message' : 'Fatal log message',   'error' : '',   'class' : 'com.test.common.logging.App',   'threadid' : '1',   'threadname' : 'main',   'whatisthis' : 'target/rolling1/rollingtest.log',   'processid' : 'FATALid',    'logdir' : '${sd:type}'   'location' : '/Users/parunkarthick/ferry-commons/common/logging/target/classes/log4j2.xml'   'systemproperty' : '${ctx:key}'   [m}
[32m{'logged time': '24 Aug 2018 12:32:51',    'LEVEL' : 'INFO',   'CLASS' : 'test.common.logging.App',   'Module' : '[main]',   'message' : 'Info log message[]',   'error' : '',   'class' : 'com.test.common.logging.App',   'threadid' : '1',   'threadname' : 'main',   'whatisthis' : 'target/rolling1/rollingtest.log',   'processid' : 'INFOid',    'logdir' : '${sd:type}'   'location' : '/Users/parunkarthick/ferry-commons/common/logging/target/classes/log4j2.xml'   'systemproperty' : '${ctx:key}'   [m}
[1;31m{'logged time': '24 Aug 2018 12:32:51',    'LEVEL' : 'ERROR',   'CLASS' : 'test.common.logging.App',   'Module' : '[main]',   'message' : 'null exception[]',   'error' : ' java.lang.NullPointerException
    at com.test.common.logging.App.main(App.java:69)
',   'class' : 'com.test.common.logging.App',   'threadid' : '1',   'threadname' : 'main',   'whatisthis' : 'target/rolling1/rollingtest.log',   'processid' : 'ERRORid',    'logdir' : '${sd:type}'   'location' : '/Users/parunkarthick/ferry-commons/common/logging/target/classes/log4j2.xml'   'systemproperty' : '${ctx:key}'   [m}

型
如果您看到lastvalue系统属性没有通过从代码值替换而按预期反映。