log4j - 在 Log4J 中，以编程方式添加过滤器不起作用。虽然我们可以通过属性文件添加多个过滤器

Question

我正在使用 log4j 1.2.17 。

我需要以编程方式添加过滤器。我正在使用来自 log4j API 的 StringMatchFilter。但它们似乎不起作用。当我添加一个 log4j.properties 文件时，多个过滤器工作，我能够抑制日志。

以下是代码：

package logging;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.log4j.ConsoleAppender;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.PatternLayout;
import org.apache.log4j.varia.StringMatchFilter;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class ProgrammaticallyAddingFilters {

  public static void main(String[] args) {

    /**
     * Related to FileAppenders
     */
    String APPN_LAYOUT_PATTERN = "%d{MM-dd@HH:mm:ss}%-4r %-5p [%t] %37c %3x - %m%n";
    Level DEFUALT_DEBUG_THRESHOLD = Level.WARN;

    Log LOG = LogFactory.getLog(ProgrammaticallyAddingFilters.class);

    ConsoleAppender consoleAppn = new ConsoleAppender();
    //configure the appender
    consoleAppn.setLayout(new PatternLayout(APPN_LAYOUT_PATTERN));
    consoleAppn.setThreshold(DEFUALT_DEBUG_THRESHOLD);
    consoleAppn.activateOptions();
    try {
      List<StringMatchFilter> filterList = getStringMatchFilters();
      for (StringMatchFilter stringMatchFilter : filterList) {
        consoleAppn.addFilter(stringMatchFilter);
      }
    } catch (Exception e) {
      LOG.warn("exception adding the supress log filters", e);
    }
    //add appender to any Logger (here is root)
    Logger.getRootLogger().addAppender(consoleAppn);

    LOG.debug("Things will fall in line soon. there is way out of every problem");
    LOG.debug("Keep Cool 123");
    LOG.debug("Hey there , Hello World");
  }

  private static List<StringMatchFilter> getStringMatchFilters() {
    List<StringMatchFilter> stringMatchFilterList = new ArrayList<>();
    StringMatchFilter smf = new StringMatchFilter();
    smf.setStringToMatch("Keep Cool 123");
    smf.setAcceptOnMatch(false);

    StringMatchFilter smf2 = new StringMatchFilter();
    smf2.setStringToMatch("Things will fall in line soon");
    smf2.setAcceptOnMatch(false);
    stringMatchFilterList.add(smf2);

    stringMatchFilterList.add(smf);
    stringMatchFilterList.add(smf2);
    return stringMatchFilterList;
  }
}

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