Java 如何取消JTextPane中文本的高亮显示

我编写了一个代码，在

JTextPane

中查找单词。这里的问题是，当我输入一个搜索词并单击搜索按钮时，它会突出显示给定搜索词的所有出现。我想突出显示第一次出现的单词，然后点击搜索按钮显示第二次出现的方式，就像这样。另一个问题是，当点击文本窗格时，搜索完成后，它并没有取消高亮显示

我的代码：

public class FindAWord extends javax.swing.JFrame {

    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        // <editor-fold defaultstate="collapsed"
        // desc=" Look and feel setting code (optional) ">
        /*
         * If Nimbus (introduced in Java SE 6) is not available, stay with the
         * default look and feel. For details see
         * http://download.oracle.com/javase
         * /tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager
                    .getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(MarkAll.class.getName()).log(
                    java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(MarkAll.class.getName()).log(
                    java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(MarkAll.class.getName()).log(
                    java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(MarkAll.class.getName()).log(
                    java.util.logging.Level.SEVERE, null, ex);
        }
        // </editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                new MarkAll().setVisible(true);
            }
        });
    }

    Highlighter.HighlightPainter myHighLightPainter = new FindAWord.MyHighightPainter(
            Color.LIGHT_GRAY);
    // Variables declaration - do not modify
    private javax.swing.JScrollPane scrollPane;
    private javax.swing.JTextField searchText;
    private javax.swing.JTextPane textPane;
    private javax.swing.JButton search;

    public FindAWord() {
        initComponents();
    }

    public void removeHighLights(JTextComponent component) {
        Highlighter hilet = component.getHighlighter();
        Highlighter.Highlight[] highLites = hilet.getHighlights();
        for (int i = 0; i < highLites.length; i++) {
            if (highLites[i].getPainter() instanceof MarkAll.MyHighightPainter) {
                hilet.removeHighlight(highLites[i]);
            }
        }
    }

    public void highLight(JTextComponent component, String patteren) {
        try {
            removeHighLights(component);
            Highlighter hLite = component.getHighlighter();
            Document doc = component.getDocument();
            String text = component.getText(0, doc.getLength());
            int pos = 0;
            while ((pos = text.toUpperCase().indexOf(patteren.toUpperCase(),
                    pos)) >= 0) {
                hLite.addHighlight(pos, pos + patteren.length(),
                        myHighLightPainter);
                pos += patteren.length();
            }
        } catch (Exception e) {
        }
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        search = new javax.swing.JButton();
        searchText = new javax.swing.JTextField();
        scrollPane = new javax.swing.JScrollPane();
        textPane = new javax.swing.JTextPane();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        search.setText("Search");
        search.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                searchActionPerformed(evt);
            }
        });

        scrollPane.setViewportView(textPane);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(
                getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(layout
                .createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(
                        layout.createSequentialGroup()
                        .addGap(36, 36, 36)
                        .addComponent(search,
                                javax.swing.GroupLayout.PREFERRED_SIZE,
                                91,
                                javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addGap(32, 32, 32)
                                .addComponent(searchText,
                                        javax.swing.GroupLayout.PREFERRED_SIZE,
                                        120,
                                        javax.swing.GroupLayout.PREFERRED_SIZE)
                                        .addContainerGap(114, Short.MAX_VALUE))
                                        .addGroup(
                                                javax.swing.GroupLayout.Alignment.TRAILING,
                                                layout.createSequentialGroup().addComponent(scrollPane)
                                                .addContainerGap()));
        layout.setVerticalGroup(layout
                .createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(
                        layout.createSequentialGroup()
                        .addGap(36, 36, 36)
                        .addGroup(
                                layout.createParallelGroup(
                                        javax.swing.GroupLayout.Alignment.BASELINE)
                                        .addComponent(search)
                                        .addComponent(
                                                searchText,
                                                javax.swing.GroupLayout.PREFERRED_SIZE,
                                                javax.swing.GroupLayout.DEFAULT_SIZE,
                                                javax.swing.GroupLayout.PREFERRED_SIZE))
                                                .addPreferredGap(
                                                        javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                                        .addComponent(scrollPane,
                                                                javax.swing.GroupLayout.DEFAULT_SIZE,
                                                                235, Short.MAX_VALUE)));

        pack();
    }// </editor-fold>

    private void searchActionPerformed(java.awt.event.ActionEvent evt) {
        if (searchText.getText().length() == 0) {
            removeHighLights(textPane);
        } else
            highLight(textPane, searchText.getText());
    }

    class MyHighightPainter extends DefaultHighlighter.DefaultHighlightPainter {
        MyHighightPainter(Color color) {
            super(color);
        }
    }
}

公共类FindAWord扩展了javax.swing.JFrame{
公共静态void main（字符串参数[]）{
/*设置Nimbus的外观和感觉*/
// 
/*
*如果Nimbus（在JavaSE6中引入）不可用，请使用
*默认外观。有关详细信息，请参阅
* http://download.oracle.com/javase
*/tutorial/uiswing/lookandfeel/plaf.html
*/
试一试{
对于（javax.swing.UIManager.LookAndFeelInfo:javax.swing.UIManager
.getInstalledLookAndFeels（））{
if（“Nimbus”.equals（info.getName（）））{
setLookAndFeel（info.getClassName（））；
打破
}
}
}捕获（ClassNotFoundException ex）{
java.util.logging.Logger.getLogger（MarkAll.class.getName（））.log(
java.util.logging.Level.SEVERE，null，ex）；
}catch（实例化异常）{
java.util.logging.Logger.getLogger（MarkAll.class.getName（））.log(
java.util.logging.Level.SEVERE，null，ex）；
}捕获（非法访问例外）{
java.util.logging.Logger.getLogger（MarkAll.class.getName（））.log(
java.util.logging.Level.SEVERE，null，ex）；
}catch（javax.swing.UnsupportedLookAndFeelException ex）{
java.util.logging.Logger.getLogger（MarkAll.class.getName（））.log(
java.util.logging.Level.SEVERE，null，ex）；
}
// 
/*创建并显示表单*/
invokeLater（new Runnable（））{
@凌驾
公开募捐{
新的MarkAll（）.setVisible（true）；
}
});
}
Highlighter.HighlightPainter myHighLightPainter=new FindAWord.myHighLightPainter(
颜色：浅灰色）；
//变量声明-不修改
私有javax.swing.JScrollPane滚动窗格；
私有javax.swing.JTextField searchText；
私有javax.swing.JTextPane textPane；
私有javax.swing.JButton搜索；
公共FindAWord（）{
初始化组件（）；
}
public void removeHighLights（JTextComponent组件）{
Highlighter hilet=component.getHighlighter（）；
Highlighter.Highlight[]highLites=hilet.getHighlights（）；
对于（int i=0；i=0）{
hLite.addHighlight（pos，pos+patteren.length（），
我的强光画家）；
pos+=patteren.length（）；
}
}捕获（例外e）{
}
}
@抑制警告（“未选中”）
// 
私有组件（）{
search=newjavax.swing.JButton（）；
searchText=newjavax.swing.JTextField（）；
scrollPane=newjavax.swing.JScrollPane（）；
textPane=newjavax.swing.JTextPane（）；
setDefaultCloseOperation（javax.swing.WindowConstants.EXIT_ON_CLOSE）；
search.setText（“search”）；
search.addActionListener（新java.awt.event.ActionListener（）{
public void actionPerformed（java.awt.event.ActionEvent evt）{
执行的搜索操作（evt）；
}
});
scrollPane.setViewportView（文本窗格）；
javax.swing.GroupLayout布局=新建javax.swing.GroupLayout(
getContentPane（））；
getContentPane（）.setLayout（布局）；
布局。setHorizontalGroup（布局
.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGroup(
layout.createSequentialGroup（）
.addGap（36,36,36）
.addComponent（搜索，
javax.swing.GroupLayout.PREFERRED_SIZE，
91,
javax.swing.GroupLayout.PREFERRED_SIZE）
.addGap（32,32,32）
.addComponent（搜索文本，
javax.swing.GroupLayout.PREFERRED_SIZE，
120,
javax.swing.GroupLayout.PREFERRED_SIZE）
.addContainerGap（114，简称最大值））
.addGroup(
javax.swing.GroupLayout.Alignment.training，
layout.createSequentialGroup（）.addComponent（滚动窗格）
.addContainerGap（））；
布局。setVerticalGroup（布局
.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGroup(
layout.createSequentialGroup（）
.addGap（36,36,36）
.addGroup(
布局。
import javax.swing.text.*;
import java.awt.*;

public class FindAWord extends javax.swing.JFrame {

    public static void main(String args[]) {
    /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
     */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        //</editor-fold>

    /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                new FindAWord().setVisible(true);
            }
        });
    }
    Highlighter.HighlightPainter myHighLightPainter=new    FindAWord.MyHighightPainter(Color.LIGHT_GRAY);
    // Variables declaration - do not modify
    private javax.swing.JScrollPane scrollPane;
    private javax.swing.JTextField searchText;
    private javax.swing.JTextPane textPane;
    private javax.swing.JButton search;
    public FindAWord() {
        initComponents();
    }
    public void highLight(JTextComponent component,String patteren){
        try {
            Document doc=component.getDocument();
            String text=component.getText(0,doc.getLength());
            int pos=component.getCaretPosition();
            if (pos==doc.getLength()) {
                pos=0;
            }
            int index=text.toUpperCase().indexOf(patteren.toUpperCase(),pos);
            if (index>=0) {
                component.setSelectionStart(index);
                component.setSelectionEnd(index+patteren.length());
                component.getCaret().setSelectionVisible(true);
            }
        }
        catch(Exception e){
            e.printStackTrace();
        }
    }
    @SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        search = new javax.swing.JButton();
        searchText = new javax.swing.JTextField();
        scrollPane = new javax.swing.JScrollPane();
        textPane = new javax.swing.JTextPane();
        searchText.setText("test");
        textPane.setText("test qweqw test asdasdas test");

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        search.setText("Search");
        search.setFocusable(false);
        search.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                searchActionPerformed(evt);
            }
        });

        scrollPane.setViewportView(textPane);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGroup(layout.createSequentialGroup()
                                .addGap(36, 36, 36)
                                .addComponent(search, javax.swing.GroupLayout.PREFERRED_SIZE, 91, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addGap(32, 32, 32)
                                .addComponent(searchText, javax.swing.GroupLayout.PREFERRED_SIZE, 120, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addContainerGap(114, Short.MAX_VALUE))
                        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                                .addComponent(scrollPane)
                                .addContainerGap())
        );
        layout.setVerticalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGroup(layout.createSequentialGroup()
                                .addGap(36, 36, 36)
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                                        .addComponent(search)
                                        .addComponent(searchText, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(scrollPane, javax.swing.GroupLayout.DEFAULT_SIZE, 235, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>

    private void searchActionPerformed(java.awt.event.ActionEvent evt) {
        highLight(textPane, searchText.getText());
    }

    class MyHighightPainter extends DefaultHighlighter.DefaultHighlightPainter{
        MyHighightPainter(Color color){
            super(color);
        }
    }
}