Question

我有一个log4j.properties文件，我必须定义~12个不同的appender。实际上，除了名称和File属性之外，所有这些appender都是相似的。我有类似的东西：

log4j.logger.FOO=DEBUG, fileFOO
log4j.appender.fileFOO=org.apache.log4j.RollingFileAppender
log4j.appender.fileFOO.File=/some/path/file-FOO.log
log4j.appender.fileFOO.MaxFileSize=5MB
log4j.appender.fileFOO.MaxBackupIndex=20
log4j.appender.fileFOO.layout=org.apache.log4j.PatternLayout
log4j.appender.fileFOO.layout.ConversionPattern=%d %-5p ~ %m%n

log4j.logger.BAR=DEBUG, fileBAR
log4j.appender.fileBAR=org.apache.log4j.RollingFileAppender
log4j.appender.fileBAR.File=/some/path/file-BAR.log
log4j.appender.fileBAR.MaxFileSize=5MB
log4j.appender.fileBAR.MaxBackupIndex=20
log4j.appender.fileBAR.layout=org.apache.log4j.PatternLayout
log4j.appender.fileBAR.layout.ConversionPattern=%d %-5p ~ %m%n

如您所见，除log4j.logger.X和log4j.appender.fileX.File

外，所有行都相同

有没有办法为appender的其他属性（MaxFileSize，MaxBackupIndex，layout等）定义默认值，类似于appender的“继承”？ / p>

由于

Answer 1

尝试实施自定义默认Appender，然后使用RollingFileAppender

log4j.logger.FOO=DEBUG, fileFOO
log4j.appender.fileFOO=me.project.MyRollingFileAppender
log4j.appender.fileFOO.File=/some/path/file-FOO.log

public class MyRollingFileAppender extends RollingFileAppender {

  public MyRollingFileAppender() {
    super();
    init();
  }

  public MyRollingFileAppender(Layout layout, String filename) throws IOException {
    super(layout, filename);
    init();
  }

  public MyRollingFileAppender(Layout layout, String filename, boolean append)
      throws IOException {
    super(layout, filename, append);
    init();
  }

  private void init() {
    this.setMaxFileSize("5MB");
    this.setMaxBackupIndex(20);
    this.setLayout( new PatternLayout("%d %-5p ~ %m%n"));
  }
}

如何在log4j.properties文件中共享appenders属性？

1 个答案: