问题描述

好的，所以我正在尝试制作一个内存附加程序(只是一个记录器，它记录到 ArrayList 而不是控制台或文件)但现在我想禁用它，使其无法打印到控制台.

问题和网站，到目前为止我已经阅读(但我仍然无法弄清楚)..

• 
  _{(来源:iforce.co.nz)}
  解决方案

  行

  MEMORY_APPENDER=false

  不起作用，您不能将附加程序设置为 false.

  在你的情况下最好做这样的事情:

  log4j.rootLogger=错误，控制台log4j.appender.console=org.apache.log4j.ConsoleAppenderlog4j.logger.nz.ac.massey.cs.sdc.log4jassignment.s06005586.MemoryAppender = 错误，MEMORY_APPENDERlog4j.additivity.nz.ac.massey.cs.sdc.log4jassignment.s06005586.MemoryAppender = false

  在您的一个示例中使用的记录器是 nz.ac.massey.cs.sdc.log4jassignment.s06005586.MemoryAppender 并且应该映射到 log4j.properties 中的记录器 或只是像 nz.ac.massey.cs.sdc.log4jassignment 这样的包部分.

  <小时>

  看来你在这里混了很多.Log4jMemoryAppender 是你的 MEMORY_APPENDER 吗?

  为什么要调用 BasicConfigurator.configure()?你不想使用 log4j.properties 吗?

  <小时>

  通常在课堂上你这样做是为了得到一个记录器:

  包 com.mycompany;公共类 MyClass {private static final Logger log = Logger.getLogger(MyClass.class);...}

  记录器名称将是完全限定的类名com.mycompany.MyClass.

  然后你可以有一个像这样的 log4j.properties:

  log4j.rootLogger=错误，控制台log4j.appender.console=org.apache.log4j.ConsoleAppenderlog4j.logger.com.mycompany=信息，文件log4j.additivity.com.mycompany=falselogfj.appender.file = <一些文件追加器>

  <小时>

  好的，从头开始.一个非常简单的例子.

  src/main/java/Log4JTest.java

  包 org.stackoverflow;导入 org.apache.log4j.Logger；/*** @作者马巴，2012-08-22*/公共类 Log4JTest {public static final Logger log = Logger.getLogger(Log4JTest.class);公共静态无效主要(字符串[]参数){log.error("main 中的错误");}}

  src/main/resources/log4j.properties

  log4j.rootLogger = 错误，控制台log4j.appender.console = org.apache.log4j.ConsoleAppenderlog4j.appender.console.layout=org.apache.log4j.PatternLayoutlog4j.appender.console.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n

  现在编译并确保 log4j.properties 与 log4j.jar 以及运行时您自己的类一起在您的类路径中.

  你会看到这个:

  0 [main] 错误 org.stackoverflow.Log4JTest - 主错误

  从这里您可以尝试添加文件附加程序或您自己的内存附加程序.

  Okay so I'm trying to make a memory appender (simply a logger, that logs to an ArrayList instead of the console or to a file) but for now I want to disable it from printing to the console.

  The questions and websites, I've read so far (but I still cant figure it out is)..

  • StackOverFlow Question log4j: Log output of a specific class to a specific appender
  • StackOverFlow Question log4j : Disable log4j console logging and enable file logging
  • Coder Launch: log4j: stop logging to console

  It has all the segments on what I'm trying to achieve, but I'm still kind of confused.

  I also read this segment from Logback or Log4j Additivity Explained Which states..

  If the aditivity flag of logger X however is set to false, or disabled, then calling x.debug() will only log to the file.

  So in theory my log4j.properties file

  log4j.rootLogger=ERROR, console
  log4j.appender.console=org.apache.log4j.ConsoleAppender
  log4j.appender.console.layout=org.apache.log4j.PatternLayout
  log4j.appender.console.layout.ConversionPattern=%d %5p %c (%F:%L) - %m%n
  #hide the Log4jMemoryAppender from console
  log4j.logger.nz.ac.massey.cs.sdc.log4jassignment.s06005586.MemoryAppender= ERROR, MEMORY_APPENDER
  log4j.appender.MEMORY_APPENDER=nz.ac.massey.cs.sdc.log4jassignment.s06005586.MemoryAppender.Log4jMemoryAppender
  log4j.additivity.rootLogger = false
  log4j.additivity.console = false
  log4j.additivity.MEMORY_APPENDER=false
  

  Should only print ***Hello World and exclude anything else from the MEMORY_APPENDER, rootLogger and console.

  package nz.ac.massey.cs.sdc.log4jassignment.s06005586.MemoryAppender;
  
  import java.util.ArrayList;
  import org.apache.log4j.AppenderSkeleton;
  import org.apache.log4j.spi.LoggingEvent;
  
  import org.apache.log4j.BasicConfigurator;
  import org.apache.log4j.Level;
  import org.apache.log4j.Logger;
  import org.apache.log4j.PropertyConfigurator;
  
  public class Log4jMemoryAppender extends AppenderSkeleton {
  
  ArrayList<LoggingEvent> eventsList = new ArrayList();
  
  public static void main (String [] args) {
  
      PropertyConfigurator.configure("Lib/log4j.properties");
      Log4jMemoryAppender app = new Log4jMemoryAppender();
      Logger logger = Logger.getLogger(Log4jMemoryAppender.class);
      logger.setLevel(Level.INFO);
  
      logger.addAppender(app);
      logger.info("Hello World");
      logger.debug("Level DEBUG Is SET");
  
      for (LoggingEvent le: app.eventsList) {
          System.out.println("***" + le.getMessage());
      }
  } 
  
  @Override
  protected void append(LoggingEvent event) {
      eventsList.add(event);
  }
  
  public void close() {
  }
  
  public boolean requiresLayout() {
      return false;
  }
  }
  

  But it doesn't...

  
  _{(source: iforce.co.nz)}

  解决方案

  The line

  MEMORY_APPENDER=false
  

  will not work, you cannot set an appender to have the value false.

  In you case better do something like this:

  log4j.rootLogger=ERROR, console
  log4j.appender.console=org.apache.log4j.ConsoleAppender
  
  log4j.logger.nz.ac.massey.cs.sdc.log4jassignment.s06005586.MemoryAppender = ERROR, MEMORY_APPENDER
  log4j.additivity.nz.ac.massey.cs.sdc.log4jassignment.s06005586.MemoryAppender = false
  

  The Logger being used in one of your example is nz.ac.massey.cs.sdc.log4jassignment.s06005586.MemoryAppender and that should map to a logger in the log4j.properties or just the package part like nz.ac.massey.cs.sdc.log4jassignment.

  ---

  It seems like you are mixing a lot here. Is Log4jMemoryAppender your MEMORY_APPENDER or not?

  And why are you calling BasicConfigurator.configure()? Don't you want to use the log4j.properties?

  ---

  Normally in a class you do this to get a logger:

  package com.mycompany;
  
  public class MyClass {
      private static final Logger log = Logger.getLogger(MyClass.class);
      ...
  }
  

  The logger name will be the fully qualified classname com.mycompany.MyClass.

  Then you can have a log4j.properties like this:

  log4j.rootLogger=ERROR, console
  log4j.appender.console=org.apache.log4j.ConsoleAppender
  
  log4j.logger.com.mycompany=INFO, file
  log4j.additivity.com.mycompany=false
  
  logfj.appender.file = <some file appender>
  

  ---

  OK, starting from beginning. A very simple example.

  src/main/java/Log4JTest.java

  package org.stackoverflow;
  
  import org.apache.log4j.Logger;
  
  /**
   * @author maba, 2012-08-22
   */
  public class Log4JTest {
  
      public static final Logger log = Logger.getLogger(Log4JTest.class);
  
      public static void main(String[] args) {
          log.error("Error in main");
      }
  }
  

  src/main/resources/log4j.properties

  log4j.rootLogger = ERROR, console
  
  log4j.appender.console = org.apache.log4j.ConsoleAppender
  log4j.appender.console.layout=org.apache.log4j.PatternLayout
  log4j.appender.console.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n
  

  Now compile and make sure that log4j.properties is in your classpath together with the log4j.jar and your own classes when running.

  You will see this:

  0    [main] ERROR org.stackoverflow.Log4JTest  - Error in main
  

  From here you can try to add a file appender or your own memory appender.

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