自己写的简易版Java日志类分享

/**
 * 
 */
 
import java.io.file;
import java.io.filewriter;
import java.io.ioexception;
import java.text.simpledateformat;
import java.util.date;
 
/**
 * @author magic282
 *
 */
public class logger {
  private static string logfilepath;
  private static boolean isinitialized = false;
  private static filewriter logwriter = null;
  private static boolean printlogwhenlog = true;
 
  private static boolean initlogger() {
    string logdirectorypath = system.getproperty("user.dir")
        + java.io.file.separatorchar + "log";
 
    if (!new file(logdirectorypath).exists()) {
      new file(logdirectorypath).mkdir();
    }
    date logfiledate = new date();
    simpledateformat dateformat = new simpledateformat(
        "yyyy-mm-dd-hh-mm-ss");
    logfilepath = logdirectorypath + java.io.file.separatorchar
        + dateformat.format(logfiledate) + ".log";
 
    try {
      logwriter = new filewriter(logfilepath, true);
      isinitialized = true;
    } catch (ioexception e) {
      // todo auto-generated catch block
      system.err.println("unable to create log file.");
      system.err.println("initilization fail.");
      e.printstacktrace();
      return false;
    }
    return true;
  }
 
  public static void log(string message) {
    if (!isinitialized) {
      initlogger();
    }
    date logfiledate = new date();
    simpledateformat dateformat = new simpledateformat(
        "yyyy-mm-dd-hh-mm-ss");
    string callingclassname = new exception().getstacktrace()[1]
        .getclassname();
    synchronized (logwriter) {
      string log = string.format("[%s] @ [%s]: %s\n", callingclassname,
          dateformat.format(logfiledate), message);
      if (printlogwhenlog) {
        system.out.printf("[log]:%s", log);
      }
      try {
        logwriter.write(log);
        logwriter.flush();
      } catch (ioexception e) {
        // todo auto-generated catch block
        system.err.println("write log to file %s error.");
        e.printstacktrace();
      }
    }
  }
 
  public static void log(exception exception) {
    if (!isinitialized) {
      initlogger();
    }
    date logfiledate = new date();
    simpledateformat dateformat = new simpledateformat(
        "yyyy-mm-dd-hh-mm-ss");
    string callingclassname = new exception().getstacktrace()[1]
        .getclassname();
    synchronized (logwriter) {
      string log = string.format("[%s] @ [%s]: %s\n", callingclassname,
          dateformat.format(logfiledate), exception.tostring());
      if (printlogwhenlog) {
        system.out.printf("[log]:%s", log);
      }
      try {
        logwriter.write(log);
        logwriter.flush();
      } catch (ioexception e) {
        // todo auto-generated catch block
        system.err.println("write log to file %s error.");
        e.printstacktrace();
      }
    }    
  }
 
}