标签：jtextpane java search file-io swing
有没有人对如何搜索文本文件并在JComponent中列出结果有任何想法,比如JPanel.
我一直试图让这项工作连续两天,但没有成功真的很感激回复.非常感谢提前.
我一直在尝试编写一个处理文本文件搜索查询的类.我的主要目标是在文本文件中获取包含在JTextField中输入的搜索关键字的行,并将其打印在适当的JComponent中(类似于JTextField,JTextPane,最适用的).
我希望搜索结果显示在谷歌搜索结果显示方式的列中,以便文本文件中的每一行都打印在自己的行中.我被告知最好使用ArrayList.我真的不知道该怎么做.我从各地获取了想法,这是我到目前为止所做的：
提前多多欣赏.我是Java的新手.我一整天都在努力做到这一点并且没有走得太远.我愿意尝试任何提供的东西,甚至是新方法.
// The class that handles the search query
// Notice that I've commented out some parts that show errors
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.swing.JTextPane;
public class Search {
public static String path;
public static String qri;
public Search(String dTestFileDAT, String qry) {
path = dTestFileDAT;
qri = qry;
}
public static JTextPane resultJTextPane;
public static List<String> linesToPresent = new ArrayList<String>();
public static List<String> searchFile(String path, String match){
File f = new File(path);
FileReader fr;
try {
fr = new FileReader(f);
BufferedReader br = new BufferedReader(fr);
String line;
do{
line = br.readLine();
Pattern p = Pattern.compile(match);
Matcher m = p.matcher(line);
if(m.find())
linesToPresent.add(line);
} while(line != null);
br.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// resultJTextPane = new JTextPane();
// resultJTextPane = (JTextPane) Home.BulletinsJPanel.add(linesToPresent);
return linesToPresent;
}
}
// This handles the click event to take the query. Notice that I've commented out some parts that show errors
private void mouseClickedSearch(java.awt.event.MouseEvent evt) {
Search fs = new Search("/D:/TestFile.dat/", "Text to search for");
// searchResultsJPanel.add(Search.searchFile("/D:/TestFile.dat/", "COLE"));
// searchResultsJTextField.add(fs);
}
解决方法:
有许多可能的解决方案,这只是一个简单的解决方案(不严肃,它是;))
基本上,这只是使用JList来存储搜索文件中搜索文本的所有匹配项.
这是一个区分大小写的搜索,所以要小心
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class MySearch {
public static void main(String[] args) {
new MySearch();
}
public MySearch() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JTextField findText;
private JButton search;
private DefaultListModel<String> model;
public TestPane() {
setLayout(new BorderLayout());
JPanel searchPane = new JPanel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.insets = new Insets(2, 2, 2, 2);
searchPane.add(new JLabel("Find: "), gbc);
gbc.gridx++;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.weightx = 1;
findText = new JTextField(20);
searchPane.add(findText, gbc);
gbc.gridx++;
gbc.fill = GridBagConstraints.NONE;
gbc.weightx = 0;
search = new JButton("Search");
searchPane.add(search, gbc);
add(searchPane, BorderLayout.NORTH);
model = new DefaultListModel<>();
JList list = new JList(model);
add(new JScrollPane(list));
ActionHandler handler = new ActionHandler();
search.addActionListener(handler);
findText.addActionListener(handler);
}
public class ActionHandler implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
model.removeAllElements();
// BufferedReader reader = null;
String searchText = findText.getText();
try (BufferedReader reader = new BufferedReader(new FileReader(new File("search.txt")))) {
String text = null;
while ((text = reader.readLine()) != null) {
if (text.contains(searchText)) {
model.addElement(text);
}
}
} catch (IOException exp) {
exp.printStackTrace();
JOptionPane.showMessageDialog(TestPane.this, "Could not create file", "Error", JOptionPane.ERROR_MESSAGE);
}
}
}
}
}
你也可以采取另一种机智,只是突出显示比赛…
这使用了略有不同的方法,因为这是交互式的.基本上你只需键入,等待1/4秒,它将开始搜索…
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
public class MySearch02 {
public static void main(String[] args) {
new MySearch02();
}
public MySearch02() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JTextField findText;
private JTextArea ta;
private Timer keyTimer;
public TestPane() {
setLayout(new BorderLayout());
JPanel searchPane = new JPanel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.insets = new Insets(2, 2, 2, 2);
searchPane.add(new JLabel("Find: "), gbc);
gbc.gridx++;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.weightx = 1;
findText = new JTextField(20);
searchPane.add(findText, gbc);
add(searchPane, BorderLayout.NORTH);
ta = new JTextArea(20, 40);
ta.setWrapStyleWord(true);
ta.setLineWrap(true);
ta.setEditable(false);
add(new JScrollPane(ta));
loadFile();
keyTimer = new Timer(250, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String find = findText.getText();
Document document = ta.getDocument();
try {
for (int index = 0; index + find.length() < document.getLength(); index++) {
String match = document.getText(index, find.length());
if (find.equals(match)) {
javax.swing.text.DefaultHighlighter.DefaultHighlightPainter highlightPainter =
new javax.swing.text.DefaultHighlighter.DefaultHighlightPainter(Color.YELLOW);
ta.getHighlighter().addHighlight(index, index + find.length(),
highlightPainter);
}
}
} catch (BadLocationException exp) {
exp.printStackTrace();
}
}
});
keyTimer.setRepeats(false);
findText.getDocument().addDocumentListener(new DocumentListener() {
@Override
public void insertUpdate(DocumentEvent e) {
keyTimer.restart();
}
@Override
public void removeUpdate(DocumentEvent e) {
keyTimer.restart();
}
@Override
public void changedUpdate(DocumentEvent e) {
keyTimer.restart();
}
});
}
protected void loadFile() {
String searchText = findText.getText();
try (BufferedReader reader = new BufferedReader(new FileReader(new File("search.txt")))) {
ta.read(reader, "Text");
} catch (IOException exp) {
exp.printStackTrace();
JOptionPane.showMessageDialog(TestPane.this, "Could not create file", "Error", JOptionPane.ERROR_MESSAGE);
}
ta.setCaretPosition(0);
}
}
}
标签：jtextpane,java,search,file-io,swing 来源： https://codeday.me/bug/20191001/1839236.html
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