如何在使用java.util.logging.Logger时将日志写入文本文件
如何在使用java.util.logging.Logger时将日志写入文本文件
提问于 2013-04-02 15:41:17
我有一种情况，我想把我创建的所有日志写到一个文本文件中。
我们使用java.util.logging.Logger接口来生成日志。
我试过了：
private static Logger logger = Logger.getLogger(className.class.getName());
FileHandler fh;
fh = new FileHandler("C:/className.log");
logger.addHandler(fh); 但是仍然只在控制台上获取我的日志...
回答 8
Stack Overflow用户
发布于 2014-06-24 00:58:45
首先，你在哪里定义了你的记录器，从哪个类\方法调用它？有一个有效的例子，就是新鲜烘焙的：
public class LoggingTester {
private final Logger logger = Logger.getLogger(LoggingTester.class
.getName());
private FileHandler fh = null;
public LoggingTester() {
//just to make our log file nicer :)
SimpleDateFormat format = new SimpleDateFormat("M-d_HHmmss");
try {
fh = new FileHandler("C:/temp/test/MyLogFile_"
+ format.format(Calendar.getInstance().getTime()) + ".log");
} catch (Exception e) {
e.printStackTrace();
}
fh.setFormatter(new SimpleFormatter());
logger.addHandler(fh);
}
public void doLogging() {
logger.info("info msg");
logger.severe("error message");
logger.fine("fine message"); //won't show because to high level of logging
}
} 在你的代码中你忘了定义格式化程序，如果你需要一个简单的格式化程序，你可以像我上面提到的那样做，但是还有另一个选择，你可以自己格式化它，有一个例子(只需插入它而不是下面的代码行fh.setFormatter(新的SimpleFormatter()：
fh.setFormatter(new Formatter() {
@Override
public String format(LogRecord record) {
SimpleDateFormat logTime = new SimpleDateFormat("MM-dd-yyyy HH:mm:ss");
Calendar cal = new GregorianCalendar();
cal.setTimeInMillis(record.getMillis());
return record.getLevel()
+ logTime.format(cal.getTime())
+ " || "
+ record.getSourceClassName().substring(
record.getSourceClassName().lastIndexOf(".")+1,
record.getSourceClassName().length())
+ "."
+ record.getSourceMethodName()
+ "() : "
+ record.getMessage() + "\n";
}
});或者任何其他你喜欢的修改。希望能有所帮助。
Stack Overflow用户
发布于 2013-04-02 15:47:39
有一个很好的库，名为log4j for Java。
这将提供大量的功能。通过链接，您将找到您的解决方案。
Stack Overflow用户
发布于 2014-04-10 17:35:47
也许this is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);
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/15758685
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