spymemcached的log4j日志配置

spymemcached日志需要在java启动参数中配置
在tomcat中配置方法:
打开tomcat/bin/catalina.sh
找的JAVA_OPTS 变量,添加行
JAVA_OPTS="$JAVA_OPTS -Dnet.spy.log.LoggerImpl=net.spy.memcached.compat.log.Log4JLogger"


在spymemcached中是这样处理的
spy的LoggerFactory类中

  @SuppressWarnings("unchecked")
  private void getConstructor() {
    Class<? extends Logger> c = DefaultLogger.class;
    String className = System.getProperty("net.spy.log.LoggerImpl");

    if (className != null) {
      try {
        c = (Class<? extends Logger>) Class.forName(className);
      } catch (NoClassDefFoundError e) {
        System.err.println("Warning:  " + className
            + " not found while initializing"
            + " net.spy.compat.log.LoggerFactory");
        e.printStackTrace();
        c = DefaultLogger.class;
      } catch (ClassNotFoundException e) {
        System.err.println("Warning:  " + className
            + " not found while initializing"
            + " net.spy.compat.log.LoggerFactory");
        e.printStackTrace();
        c = DefaultLogger.class;
      }
    }

    // Find the best constructor
    try {
      // Try to find a constructor that takes a single string
      Class<?>[] args = { String.class };
      instanceConstructor = c.getConstructor(args);
    } catch (NoSuchMethodException e) {
      try {
        // Try to find an empty constructor
        Class<?>[] args = {};
        instanceConstructor = c.getConstructor(args);
      } catch (NoSuchMethodException e2) {
        System.err.println("Warning:  " + className
            + " has no appropriate constructor, using defaults.");

        // Try to find a constructor that takes a single string
        try {
          Class<?>[] args = { String.class };
          instanceConstructor = DefaultLogger.class.getConstructor(args);
        } catch (NoSuchMethodException e3) {
          // This shouldn't happen.
          throw new NoSuchMethodError("There used to be a constructor that "
              + "takes a single String on " + DefaultLogger.class + ", but I "
              + "can't find one now.");
        } // SOL
      } // No empty constructor
    } // No constructor that takes a string
  } // getConstructor


然后再log4j.properties文件中添加
#memcached logger
log4j.logger.net.spy=debug, memcachedLog
log4j.appender.memcachedLog=org.apache.log4j.DailyRollingFileAppender
log4j.appender.memcachedLog.File=d:/memcached2.log
log4j.appender.memcachedLog.DatePattern='_'yyyy-MM-dd'.log'
log4j.appender.memcachedLog.layout=org.apache.log4j.PatternLayout
log4j.appender.memcachedLog.layout.ConversionPattern=%d %p [%t] | %m%n

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