【发布时间】：2014-09-21 18:54:50
【问题描述】：
我想将颜色应用于 java 关键字。当我打开一个文件时，它会引发尝试在通知异常中变异并且程序未完全显示并且颜色也未应用。 这是我的代码，
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FileDialog;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JInternalFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.JTextPane;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyleContext;
import javax.swing.text.StyledDocument;
public class JavaKeywordsColor extends javax.swing.JFrame {
private JTextPane textPane;
private Color color = Color.BLACK;
private int i = 0;
private JPanel noWrapPanel;
private JScrollPane scrollpane;
private JTextField status;
private StyledDocument d;
private String[] keywords = {"import ", "class ", "int ", "public ", "private"};
public JavaKeywordsColor() {
initComponents();
}
private void initComponents() {
tp = new javax.swing.JTabbedPane();
jMenuBar1 = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
Open = new javax.swing.JMenuItem();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jMenu1.setText("File");
Open.setText("Open");
Open.addActionListener(new java.awt.event.ActionListener() {
@Override
public void actionPerformed(java.awt.event.ActionEvent evt) {
OpenActionPerformed(evt);
}
});
jMenu1.add(Open);
jMenuBar1.add(jMenu1);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(tp, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE));
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(tp, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 279, Short.MAX_VALUE));
pack();
}// </editor-fold>
private void OpenActionPerformed(java.awt.event.ActionEvent evt) {
FileDialog fd = new FileDialog(JavaKeywordsColor.this, "Select File", FileDialog.LOAD);
fd.setVisible(true);
String title;
String sts;
if (fd.getFile() != null) {
sts = fd.getDirectory() + fd.getFile();
title = fd.getFile();
BufferedReader br = null;
StringBuffer str = new StringBuffer("");
try {
br = new BufferedReader(new FileReader(sts));
String line;
try {
while ((line = br.readLine()) != null) {
str.append(line + "\n");
}
} catch (IOException ex) {
Logger.getLogger(JavaKeywordsColor.class.getName()).log(Level.SEVERE, null, ex);
}
} catch (FileNotFoundException ex) {
Logger.getLogger(JavaKeywordsColor.class.getName()).log(Level.SEVERE, null, ex);
}
String t = str.toString();
final JInternalFrame internalFrame = new JInternalFrame("", true, true);
textPane = new JTextPane();
// textPane.setEditorKit(new WrapEditorKit());
d = textPane.getStyledDocument();
d.addDocumentListener(new DocumentListener() {
@Override
public void insertUpdate(DocumentEvent de) {
jColorActionPerformed(de);
}
@Override
public void removeUpdate(DocumentEvent de) {
jColorActionPerformed(de);
}
@Override
public void changedUpdate(DocumentEvent de) {
jColorActionPerformed(de);
}
});
Document doc = textPane.getDocument();
textPane.setFont(new java.awt.Font("Miriam Fixed", 0, 13));
internalFrame.add(textPane);
i += 1;
internalFrame.setName("Doc" + i);
this.add(new javax.swing.JScrollPane(textPane));
noWrapPanel = new JPanel(new BorderLayout());
noWrapPanel.add(textPane);
scrollpane = new JScrollPane(noWrapPanel);
internalFrame.add(scrollpane);
internalFrame.setTitle(title);
tp.add(internalFrame);
tp.setSelectedIndex(i - 1);
internalFrame.setVisible(true);
textPane.setText(t);
}
}
private void jColorActionPerformed(DocumentEvent evt) {
replace(textPane);
}
public void replace(javax.swing.JTextPane jp) {
int cur = jp.getCaretPosition();
StyleContext sc = StyleContext.getDefaultStyleContext();
AttributeSet aset = sc.addAttribute(SimpleAttributeSet.EMPTY, StyleConstants.Foreground, Color.BLUE);
for (int ii = 0; ii < keywords.length; ii++) {
int fromIndex = 0;
String msg = keywords[ii];
int nol = 0; //number of lines upto keyword
int len = 1;
while (len != -1) {
len = jp.getText().indexOf(msg, fromIndex);
jp.setSelectedTextColor(Color.RED);
if (len != -1) {
try {
nol = countLine(jp.getText(0, len + 1));
} catch (BadLocationException ex) {
break;
}
fromIndex = len + msg.length();
System.out.println("len = " + len + " nol=" + nol);
len -= nol;
jp.select(len, len + msg.length());
System.out.println("Selected Text = " + jp.getSelectedText());
jp.replaceSelection("");
jp.setCaretPosition(len);
jp.setCharacterAttributes(aset, false);
jp.replaceSelection(msg);
}
}
}
aset = sc.addAttribute(SimpleAttributeSet.EMPTY, StyleConstants.Foreground, Color.BLACK);
jp.setCharacterAttributes(aset, false);
jp.setCaretPosition(cur);
}
public int countLine(String str) {
int n = 0;
for (int ii = 0; ii < str.length(); ii++) {
if (str.charAt(ii) == '\n') {
n++;
}
}
return n;
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new JavaKeywordsColor().setVisible(true);
}
});
}
private javax.swing.JMenuItem Open;
private javax.swing.JMenu jMenu1;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JTabbedPane tp;
}
【问题讨论】：
标签： java swing colors keyword jtextpane