日志配置log4j 打印线程号

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# Set root logger level to WARN and append to stdout log4j.rootLogger=INFO,stdout,R,R1 #日志文件输出目标，控制台/文件 #日志输出方式:控制台 log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.layout=com.youcompan.project.log4j.Log4jExPatternLayout log4j.appender.stdout.layout.ConversionPattern=[xxxx] %d %5p %T (%c.%M:%L) - %m%n #应用服务器日志目录 log4j.appender.R=org.apache.log4j.DailyRollingFileAppender log4j.appender.R.File=${catalina.home}/logs/ydbudget.log log4j.appender.R.DatePattern = '.'yyyy-MM-dd'.log' #log4j.appender.R.MaxFileSize=500KB log4j.appender.R.layout=com.youcompan.project.log4j.Log4jExPatternLayout log4j.appender.R.layout.ConversionPattern=[xxxx]%d%5p %T (%C.%M:%L) - %m%n log4j.appender.R.Append=true #应用根目录 log4j.appender.R1=org.apache.log4j.DailyRollingFileAppender log4j.appender.R1.File=${webApp.root}logs/ydbudget.log log4j.appender.R1.DatePattern = '.'yyyy-MM-dd'.log' #log4j.appender.R1.MaxFileSize=500KB log4j.appender.R1.layout=com.youcompan.project.log4j.Log4jExPatternLayout log4j.appender.R1.layout.ConversionPattern=[xxxx]%d%5p %T (%C.%M:%L) - %m%n log4j.appender.R1.Append=true

输出三个地方 配置基本一致， 当然相对路径不同，按日滚动吧

其中应用服务器 中${catalina.home}是tomcat系的自带系统变量 ，无需其他配置

而应用根目录中的${webApp.root} 是在web.xml中通过spring定义的

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<context-param>   <param-name>webAppRootKey</param-name>   <param-value>webApp.root</param-value> </context-param> <context-param>   <param-name>log4jConfigLocation</param-name>   <param-value>classpath:log4j.properties</param-value> </context-param> <listener>      <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>   </listener>

现在来看布局类的定义和pattern的配置，

Log4jExPatternLayout 这个类是继承自 org.apache.log4j.PatternLayout ，其主要功能就是为了让 pattern 中的 %T 显示 线程号，上代码，

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public class Log4jExPatternLayout extends PatternLayout {     public Log4jExPatternLayout(String pattern){         super(pattern);     }            public Log4jExPatternLayout(){         super();     }      /**       * 重写createPatternParser方法，返回PatternParser的子类       */      @Override      protected PatternParser createPatternParser(String pattern) {       return new Log4jExPatternParser(pattern);      }    }

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public class Log4jExPatternParser extends PatternParser {        public Log4jExPatternParser(String pattern) {         super(pattern);     }      /**       * 重写finalizeConverter，对特定的占位符进行处理，T表示线程ID占位符       */      @Override      protected void finalizeConverter(char c) {       if (c == 'T') {        this.addConverter(new ExPatternConverter(this.formattingInfo));       } else {        super.finalizeConverter(c);       }      }         private static class ExPatternConverter extends PatternConverter {          public ExPatternConverter(FormattingInfo fi) {        super(fi);       }          /**        * 当需要显示线程ID的时候，返回当前调用线程的ID        */       @Override       protected String convert(LoggingEvent event) {        return String.valueOf(Thread.currentThread().getId());       }         }       }

参考文档忘记了，这篇文章是后来整理的，感谢他们吧

 

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