logmessage.java

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package mm7;
import java.io.*;
import java.util.Date;
import java.text.SimpleDateFormat;

public class Logmessage {
  private PrintWriter log;
  private String logFile = "E://log";
  SimpleDateFormat format;
  String datatime="";

  /**
  * 初始化
  */
  public Logmessage() {
    String file="";
    String fullpath="";

    file="" + (new SimpleDateFormat("yyyy-MM-dd")).format(new Date()) + ".log";
    fullpath=logFile + "\\" + file;

    format = new SimpleDateFormat("yy-MM-dd HH:mm:ss");
    try {
      log = new PrintWriter(new FileWriter(fullpath, true), true);
    }
    catch (IOException e) {
      System.err.println("无法打开日志文件: " + fullpath);
      log = new PrintWriter(System.err);
    }
  }
  /**
  * 将文本信息日志文件
  */

  public void log(String msg) {
    datatime = format.format(new Date())+"";
    log.println(datatime + ": " + msg);
  }

  /**
   * 将文本信息与异常写入日志文件
   */
  public void log(Throwable e, String msg) {
    datatime = format.format(new Date())+"";
    log.println(datatime + ": " + msg);
    e.printStackTrace(log);
  }

}