(Java) Schreiben von Ereignissen, um Textdatei zu protokollieren

Question

Ich versuche, die Ereignisse in einer Protokolldatei zu schreiben, aber keine Datei wird erstellt. Ich bekomme überhaupt keinen Fehler. Hier ist die Log-Klasse:

public class Logs { 
static FileHandler fileTxt; 
static SimpleFormatter formatterTxt; 


static public void logging() throws IOException { 

    Logger logger = Logger.getLogger(""); 
    logger.setLevel(Level.INFO);//Loget Info, Warning dhe Severe do ruhen 
    fileTxt = new FileHandler("c:/SimleTaskEvents.txt"); 
    formatterTxt = new SimpleFormatter(); 
    fileTxt.setFormatter(formatterTxt); 
    logger.addHandler(fileTxt); 

} 
} 

Answer 1

fileTxt = new FileHandler("c:/SimleTaskEvents.txt"); 

Diese Linie erzeugt nur einen Handler.

Es erstellt die Datei nicht. Was Sie tun müssen, ist, erstellen Sie die Datei (SimleTaskEvents.txt) im Verzeichnis "C: /". Danach, wenn Sie Ihr Programm ausführen, das gleiche Programm, das Sie hier gesetzt haben, sehen Sie Protokolle, die darauf geschrieben werden.

Answer 2

Sie müssen diese Importe hinzuzufügen:

import java.util.logging.Logger; 
import java.util.logging.Level; 

Answer 3

Sie müssen das Protokoll zuerst

logger.info("this is a line of logging"); 

und vielleicht lesen Sie in diesem tutorial

Answer 4

schreiben

Wir verwenden Logger in unserer Anwendung wie diese

import org.apache.log4j.BasicConfigurator; 
import org.apache.log4j.Category; 
import org.apache.log4j.PropertyConfigurator; 



public class MyLogger { 


public static Category appLog = Category.getInstance(MyLogger .class.getName() + ".APPLOG"); 

static { 
    try{ 
     BasicConfigurator.configure(); 
     Properties properties = new Properties(); 
     properties.load("PropertyFileName"); 
     PropertyConfigurator.configure(properties); 
     MyLogger.appLog.setAdditivity(false); 
     MyLogger.appLog.info("This is application log"); 

    }catch(Exception e){ 
     e.printStacktrace(); 
    } 
} 
} 

Und das sind die Daten in Eigenschaftendatei

#Logging configuration file. 

log4j.rootCategory=DEBUG, DEFAULTAPPENDER 

log4j.category.MyLogger.APPLOG=DEBUG, APPLOGAPPENDER 
log4j.appender.APPLOGAPPENDER=org.apache.log4j.RollingFileAppender 
log4j.appender.APPLOGAPPENDER.File=${catalina.home}/logs/applog.log 
log4j.appender.APPLOGAPPENDER.MaxFileSize=5000KB 
log4j.appender.APPLOGAPPENDER.MaxBackupIndex=20 
log4j.appender.APPLOGAPPENDER.layout=org.apache.log4j.PatternLayout 
log4j.appender.APPLOGAPPENDER.layout.ConversionPattern=%d - %m%n 

Answer 5

Vielleicht this is, was Sie brauchen ...

import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.io.IOException; 
import java.util.logging.FileHandler; 
import java.util.logging.Level; 
import java.util.logging.Logger; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JOptionPane; 
import javax.swing.JPanel; 

/** 
* LogToFile class 
* This class is intended to be use with the default logging class of java 
* It save the log in an XML file and display a friendly message to the user 
* @author Ibrabel <ibrabel@gmail.com> 
*/ 
public class LogToFile { 

    protected static final Logger logger=Logger.getLogger("MYLOG"); 
    /** 
    * log Method 
    * enable to log all exceptions to a file and display user message on demand 
    * @param ex 
    * @param level 
    * @param msg 
    */ 
    public static void log(Exception ex, String level, String msg){ 

     FileHandler fh = null; 
     try { 
      fh = new FileHandler("log.xml",true); 
      logger.addHandler(fh); 
      switch (level) { 
       case "severe": 
        logger.log(Level.SEVERE, msg, ex); 
        if(!msg.equals("")) 
         JOptionPane.showMessageDialog(null,msg, 
          "Error", JOptionPane.ERROR_MESSAGE); 
        break; 
       case "warning": 
        logger.log(Level.WARNING, msg, ex); 
        if(!msg.equals("")) 
         JOptionPane.showMessageDialog(null,msg, 
          "Warning", JOptionPane.WARNING_MESSAGE); 
        break; 
       case "info": 
        logger.log(Level.INFO, msg, ex); 
        if(!msg.equals("")) 
         JOptionPane.showMessageDialog(null,msg, 
          "Info", JOptionPane.INFORMATION_MESSAGE); 
        break; 
       case "config": 
        logger.log(Level.CONFIG, msg, ex); 
        break; 
       case "fine": 
        logger.log(Level.FINE, msg, ex); 
        break; 
       case "finer": 
        logger.log(Level.FINER, msg, ex); 
        break; 
       case "finest": 
        logger.log(Level.FINEST, msg, ex); 
        break; 
       default: 
        logger.log(Level.CONFIG, msg, ex); 
        break; 
      } 
     } catch (IOException | SecurityException ex1) { 
      logger.log(Level.SEVERE, null, ex1); 
     } finally{ 
      if(fh!=null)fh.close(); 
     } 
    } 

    public static void main(String[] args) { 

     /* 
      Create simple frame for the example 
     */ 
     JFrame myFrame = new JFrame(); 
     myFrame.setTitle("LogToFileExample"); 
     myFrame.setSize(300, 100); 
     myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     myFrame.setLocationRelativeTo(null); 
     JPanel pan = new JPanel(); 
     JButton severe = new JButton("severe"); 
     pan.add(severe); 
     JButton warning = new JButton("warning"); 
     pan.add(warning); 
     JButton info = new JButton("info"); 
     pan.add(info); 

     /* 
      Create an exception on click to use the LogToFile class 
     */ 
     severe.addActionListener(new ActionListener(){ 

      @Override 
      public void actionPerformed(ActionEvent ae) { 
       int j = 20, i = 0; 
       try { 
        System.out.println(j/i); 
       } catch (ArithmeticException ex) { 
        log(ex,"severe","You can't divide anything by zero"); 
       } 

      } 

     }); 

     warning.addActionListener(new ActionListener(){ 

      @Override 
      public void actionPerformed(ActionEvent ae) { 
       int j = 20, i = 0; 
       try { 
        System.out.println(j/i); 
       } catch (ArithmeticException ex) { 
        log(ex,"warning","You can't divide anything by zero"); 
       } 

      } 

     }); 

     info.addActionListener(new ActionListener(){ 

      @Override 
      public void actionPerformed(ActionEvent ae) { 
       int j = 20, i = 0; 
       try { 
        System.out.println(j/i); 
       } catch (ArithmeticException ex) { 
        log(ex,"info","You can't divide anything by zero"); 
       } 

      } 

     }); 

     /* 
      Add the JPanel to the JFrame and set the JFrame visible 
     */ 
     myFrame.setContentPane(pan); 
     myFrame.setVisible(true); 
    } 
}