Window Handler: display log message in a window(JFrame) : Log « Language Basics « Java

1. Java
2. Language Basics
3. Log

Window Handler: display log message in a window(JFrame)

     
 

import java.util.logging.ErrorManager;
import java.util.logging.Filter;
import java.util.logging.Formatter;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.LogManager;
import java.util.logging.LogRecord;
import java.util.logging.Logger;
import java.util.logging.SimpleFormatter;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

class LogWindow extends JFrame {
  private JTextArea textArea = new JTextArea();

  public LogWindow() {
    super("");
    setSize(300, 300);
    add(new JScrollPane(textArea));
    setVisible(true);
  }

  public void showInfo(String data) {
    textArea.append(data);
    this.validate();
  }
}

class WindowHandler extends Handler {
  private LogWindow window = null;

  private Formatter formatter = null;

  private Level level = null;

  private static WindowHandler handler = null;

  private WindowHandler() {
    LogManager manager = LogManager.getLogManager();
    String className = this.getClass().getName();
    String level = manager.getProperty(className + ".level");
    setLevel(level != null ? Level.parse(level) : Level.INFO);
    if (window == null)
      window = new LogWindow();
  }

  public static synchronized WindowHandler getInstance() {
    if (handler == null) {
      handler = new WindowHandler();
    }
    return handler;
  }

  public synchronized void publish(LogRecord record) {
    String message = null;
    if (!isLoggable(record))
      return;
    message = getFormatter().format(record);
    window.showInfo(message);
  }

  public void close() {
  }

  public void flush() {
  }
}

public class Main {
  private WindowHandler handler = null;

  private Logger logger = null;

  public Main() {
    handler = WindowHandler.getInstance();
    logger = Logger.getLogger("logging.handler");
    logger.addHandler(handler);
  }

  public void logMessage() {
    logger.info("Hello from ...");
  }

  public static void main(String args[]) {
    Main demo = new Main();
    demo.logMessage();
    WindowHandler h = WindowHandler.getInstance();
    LogRecord r = new LogRecord(Level.WARNING, "The Handler publish method...");
    h.publish(r);
  }
}

   
    
    
    
    
  

Related examples in the same category

1.	Log level
2.	Simple Log Formatter Example
3.	Log to file with FileHandler and SimpleFomatter
4.	Log multiple Handlers
5.	Log multiple Handlers 2
6.	Override LogRecord toString()
7.	Email Logger
8.	Log To File with FileHandler
9.	Logging Levels
10.	Creating a Custom Log Level
11.	Logging Level Manipulation
12.	Configure Logging
13.	How to write custom Log handler
14.	Log Client Filter
15.	Log HTML Table Formatter
16.	Logging Example 1
17.	Basic Logging Example
18.	Java Log:Basic Logging
19.	Java log: Hierarchy logging
20.	Java log: various log methods
21.	Java log: Stream Handler Demo
22.	Java log: File Handler Demo
23.	Java log: Memory Handler Demo
24.	Java log: Socket Handler Demo
25.	Java log: Basic logging 2
26.	Java log: Logging Server
27.	Java log: log filter
28.	Java log: XML log
29.	Java log: alternate XML log
30.	Java log: Localize Logging
31.	Java log: Custom XML Formatter
32.	Java log: Remote Config Reader
33.	Java log: Log and Window(JFrame, frame)
34.	File Logger
35.	Setting the Formatter of a Logger Handler
36.	Memory Handler Demo
37.	Socket Handler Demo
38.	XMLFormatter based Logging
39.	#define the properties for the SocketHandler
40.	Custom filter
41.	Using Regular Expressions based on StreamHandler
42.	The Quintessential Logging Program
43.	Determining If a Message Will Be Logged
44.	Logging a Method Call
45.	Logging an Exception
46.	Minimizing the Impact of Logging Code
47.	Preventing a Logger from Forwarding Log Records to Its Parent
48.	Writing Log Records to a Log File
49.	A file handler that appends.
50.	Writing Log Records to Standard Error
51.	Writing Log Records Only After a Condition Occurs
52.	Create a memory handler with a memory of 100 records and dumps the records into the file my.log
53.	Setting a Filter on a Logger Handler
54.	Comparing Log Levels: To compare the severity of two logging levels, use Level.intValue().
55.	Creating a Custom Formatter for a Logger Handler
56.	Limiting the Size of a Log File
57.	Limiting the Size of a Log by Using a Rotating Sequence of Files
58.	Configuring Logger Default Values with a Properties File
59.	Determining When the Logging Configuration Properties are Reread
60.	Handling Errors While Parsing an XML File
61.	An example of a program providing the functionality of logging
62.	Use Logger with simple formatter and FileHandler
63.	Logger with XMLFormatter and FileHandler
64.	Stream Handler
65.	The Patterns in FileHandler
66.	Flush File Handler and Logger
67.	Config Demo
68.	config.properties
69.	Alternate XML by using FileHandler
70.	Localized Logging
71.	Define your own Custom Formatter
72.	Remote ConfigReader with URLConnection
73.	Create log with package name
74.	Logger Demo
75.	Return a message for logging.
76.	A simple wrapper around JDK logging facilities
77.	A modification of the image viewer program that logs various events
78.	A class helper for logging service.
79.	Logging Thread Pool
80.	Logging Thread