log.java

用Java开发的学生信息管理系统

package studentsystem;
// @download by http://www.codefans.net
import java.io.*;
import java.awt.*;
import javax.swing.*;
import java.util.*;
import java.text.*;


public class Log {

  File log;
  FileOutputStream fos;
  public void addLog(String user,String s){
     log= new File("log.txt");
    try {

     fos =new FileOutputStream(log,true);
      byte[] sb=s.getBytes();//参数字符串s
      byte[] userb=user.getBytes();
      Date date=new Date();
      DateFormat df=DateFormat.getDateTimeInstance();
     // byte[] db=date.toString().getBytes();
     byte[] dtb=df.format(date).toString().getBytes();//时间日期
     String rn="\r\n";
     byte[] rnb=rn.getBytes();//回车换行符
     String nbsp="          ";
     byte[] nbspb=nbsp.getBytes();//空格
     fos.write(rnb);
      fos.write(dtb);
      fos.write(nbspb);
      fos.write(userb);
      fos.write(nbspb);
      fos.write(sb);
    }
    catch (IOException ee) {
      JOptionPane.showMessageDialog(null,"添加日志时出错！");
      throw new RuntimeException(ee);
    }
  }
  public void closeStream(){
   try{
     fos.close();
   }catch(Exception ee){
         JOptionPane.showMessageDialog(null,"关闭日志文件时出错！");
   }
  }


}