package helpEntity; import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.FileWriter; import java.io.PrintWriter; import java.text.SimpleDateFormat; import java.util.Date; public class Log {  private File file = null;  public File getFile() {   return file;  }  public void setFile(File file) {   this.file = file;  }  public void saveLog(Exception e, String youName) {   try {    String nowPath = null;    nowPath = System.getProperty("user.dir");    String tempPath = null;    this.file = new File(nowPath);    tempPath = this.file.getParent();    if (tempPath == null) {     this.file = new File(nowPath);    }    this.file = new File(tempPath + "" + File.separator + "log.txt");    PrintWriter writer = null;    FileWriter fileWrite = new FileWriter(file, true);    writer = new PrintWriter(fileWrite);    writer.append(System.getProperty("line.separator")      + new SimpleDateFormat("yyyy-MM-dd:HH:mm:ss")        .format(new Date()) + "__" + youName);    writer.append(System.getProperty("line.separator"));    writer.append("      *************************" + e.toString()      + "*************************");    writer.append(System.getProperty("line.separator"));    e.printStackTrace(writer);    writer.flush();    writer.close();   } catch (Exception e2) {    e2.printStackTrace();   }  } }