学步园

  private static final ThreadLocal < String > tlLogId =
      new ThreadLocal < String > () {
              @Override protected String initialValue() {
                return "unknown";
        }
    };
   
    public static String getLogId() {
        return tlLogId.get();
    }
 
    public static void setLogId(String x) {
        tlLogId.set(x);
    }