我实际上是用JTextPane在我的图形应用程序中编写所有log4j日志。它工作没有任何问题，但实际上它不是立即写我的日志（我的意思是它等待生成所有日志，然后在我的应用程序的最后一次写入它们。）
如何立即写下每个新的日志行？
MainLogger
public class MainLogger {
public static Logger log = Logger.getLogger("Logger");
private static boolean init = false;
private MainLogger(){}
public static void init(Appender appender,Level l){
if (init != true){
log.addAppender(appender);
log.setLevel(l);
}
init = true;
}
public static void logWarn(final String s){
log.warn(s);
}
public static void logError(final String s){
log.error(s);
}
public static void logError(final Throwable ex){
log.fatal(new String(),ex);
}
public static void logTrace(final String s){
log.trace(s);
}
}
FlexibleLayout
public class FlexibleLayout extends Layout {
private String NL = System.getProperty("line.separator");
@Override
public void activateOptions() {
// TODO Auto-generated method stub
}
@Override
public String format(LoggingEvent event) {
StringBuffer sb = new StringBuffer();
sb.append(event.getLevel().toString()).append(": ");
// sb.append("[")
// .append(event.getLocationInformation().fullInfo)
// .append("] :");
sb.append(event.getMessage()).append(NL);
if (event.getThrowableInformation() != null){
String[] s = event.getThrowableStrRep();
for (int i=0;i<s.length;i++){
sb.append(s[i]).append(NL);
}
}
return sb.toString();
}
@Override
public boolean ignoresThrowable() {
return false;
}
}
JTextPaneAppender
public class JTextPaneAppender extends AppenderSkeleton {
private JTextPane _jtextpane = null;
public Style _styleNormal;
public Style _styleBold;
public Style _styleRed;
public Style _styleBlue;
private Layout _pl = new FlexibleLayout();
private JTextPaneAppender(){}
public JTextPaneAppender(JTextPane j){
super();
_jtextpane = j;
StyledDocument doc= _jtextpane.getStyledDocument();
_styleNormal=doc.addStyle("regular", null);
StyleConstants.setForeground(_styleNormal, Color.BLACK);
_styleBlue=doc.addStyle("blue", null);
StyleConstants.setForeground(_styleBlue, Color.BLUE);
_styleBold=doc.addStyle("bold", _styleNormal);
StyleConstants.setBold(_styleBold, true);
_styleRed=doc.addStyle("red", _styleBold);
StyleConstants.setForeground(_styleRed, Color.RED);
}
@Override
protected void append(LoggingEvent event) {
String toLog = _pl.format(event);
if (_jtextpane != null){
if (event.getLevel().equals(Level.ERROR)) logError(toLog);
else if (event.getLevel().equals(Level.FATAL)) logFatal(toLog);
else if (event.getLevel().equals(Level.WARN)) logWarning(toLog);
else if (event.getLevel().equals(Level.TRACE)) logTrace(toLog);
}
}
private void logTrace(String s){
log(s,_styleNormal);
}
private void logWarning(String s){
log(s,_styleBlue);
}
private void logFatal(String s){
logError(s);
}
private void logError(String s){
log(s,_styleRed);
}
private void log(String s, Style style){
if (s== null) return;
if (_jtextpane == null) return;
StyledDocument doc= _jtextpane.getStyledDocument();
try {
doc.insertString(doc.getLength(), s, style);
} catch (BadLocationException e) {}
}
@Override
public void close() {
// TODO Auto-generated method stub
}
@Override
public boolean requiresLayout() {
return false;
}
}
TestFrame
public class TestFrame extends JFrame {
private static final long serialVersionUID = 1L;
private JPanel jContentPane = null;
private JScrollPane jScrollPane = null;
private JTextPane jTextPane = null;
private JButton jButton = null;
private JPanel jPanel = null;
private JButton jButton1 = null;
private JButton jButton2 = null;
private JButton jButton3 = null;
/**
* This method initializes jScrollPane
*
* @return javax.swing.JScrollPane
*/
private JScrollPane getJScrollPane() {
if (jScrollPane == null) {
jScrollPane = new JScrollPane();
jScrollPane.setMaximumSize(new Dimension(800, 300));
jScrollPane.setMinimumSize(new Dimension(800, 300));
jScrollPane.setPreferredSize(new Dimension(800, 300));
jScrollPane.setBorder(BorderFactory.createTitledBorder(null, "JtextPane Log", TitledBorder.DEFAULT_JUSTIFICATION, TitledBorder.DEFAULT_POSITION, new Font("Dialog", Font.BOLD, 12), new Color(51, 51, 51)));
jScrollPane.setViewportView(getJTextPane());
}
return jScrollPane;
}
/**
* This method initializes jTextPane
*
* @return javax.swing.JTextPane
*/
private JTextPane getJTextPane() {
if (jTextPane == null) {
jTextPane = new JTextPane();
jTextPane.setEditable(false);
jTextPane.addCaretListener(new javax.swing.event.CaretListener() {
public void caretUpdate(javax.swing.event.CaretEvent e) {
String s = getJTextPane().getText();
System.out.println(s.length()); // TODO Auto-generated Event stub caretUpdate()
}
});
}
return jTextPane;
}
/**
* This method initializes jButton
*
* @return javax.swing.JButton
*/
private JButton getJButton() {
if (jButton == null) {
jButton = new JButton();
jButton.setText("AddError");
jButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
MainLogger.logError("An Error");
}
});
}
return jButton;
}
/**
* This method initializes jPanel
*
* @return javax.swing.JPanel
*/
private JPanel getJPanel() {
if (jPanel == null) {
jPanel = new JPanel();
jPanel.setLayout(new BoxLayout(getJPanel(), BoxLayout.Y_AXIS));
jPanel.add(getJButton(), null);
jPanel.add(getJButton1(), null);
jPanel.add(getJButton2(), null);
jPanel.add(getJButton3(), null);
}
return jPanel;
}
/**
* This method initializes jButton1
*
* @return javax.swing.JButton
*/
private JButton getJButton1() {
if (jButton1 == null) {
jButton1 = new JButton();
jButton1.setText("Add Exception");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
try {
throw new Exception("This is a custom exception");
} catch (Exception e1) {
MainLogger.logError(e1);
}
}
});
}
return jButton1;
}
/**
* This method initializes jButton2
*
* @return javax.swing.JButton
*/
private JButton getJButton2() {
if (jButton2 == null) {
jButton2 = new JButton();
jButton2.setText("Add Warning");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
MainLogger.logWarn("This is a warning!!");
}
});
}
return jButton2;
}
/**
* This method initializes jButton3
*
* @return javax.swing.JButton
*/
private JButton getJButton3() {
if (jButton3 == null) {
jButton3 = new JButton();
jButton3.setText("Add Trace");
jButton3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
MainLogger.logTrace("This is a Trace message!");
}
});
}
return jButton3;
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
SwingUtilities.invokeLater(new Runnable() {
public void run() {
TestFrame thisClass = new TestFrame();
thisClass.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
thisClass.setVisible(true);
MainLogger.init(
new JTextPaneAppender(thisClass.getJTextPane()),
org.apache.log4j.Level.TRACE);
}
});
}
/**
* This is the default constructor
*/
public TestFrame() {
super();
initialize();
}
/**
* This method initializes this
*
* @return void
*/
private void initialize() {
this.setSize(800, 600);
this.setMaximumSize(new Dimension(800, 600));
this.setMinimumSize(new Dimension(800, 600));
this.setPreferredSize(new Dimension(800, 600));
this.setContentPane(getJContentPane());
this.setTitle("JFrame");
}
/**
* This method initializes jContentPane
*
* @return javax.swing.JPanel
*/
private JPanel getJContentPane() {
if (jContentPane == null) {
jContentPane = new JPanel();
jContentPane.setLayout(new BorderLayout());
jContentPane.add(getJScrollPane(), BorderLayout.SOUTH);
jContentPane.add(getJPanel(), BorderLayout.NORTH);
}
return jContentPane;
}
} // @jve:decl-index=0:visual-constraint="10,10"
非常感谢