我正在尝试将事件写入日志文件，但没有创建文件。我完全没有错误。这是日志类：
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);
}
}
fileTxt = new FileHandler("c:/SimleTaskEvents.txt");
此行仅创建一个处理程序。
它不创建文件。您需要做的是，在目录“C:/”中创建文件（SimleTaskEvents.txt） 。之后，当你执行你的程序时，你放在这里的同一个程序，你会看到正在写入的日志。
您需要添加这些导入：
import java.util.logging.Logger;
import java.util.logging.Level;
我们像这样在我们的应用程序中使用记录器
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();
}
}
}
这是属性文件中的数据
#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
也许这就是你需要的...
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);
}
}