使用java开发文本全局搜索器

package test;

import java.awt.Button;
import java.awt.EventQueue;
import java.awt.TextArea;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import java.awt.Font;

public class Main {

private JFrame frame;
private JTextField textField;
private JTextField textField_1;
private TextArea textArea;
private String filePath;

/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Main window = new Main();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}

/**
* Create the application.
*/
public Main() {
initialize();
}

/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setTitle("\u6587\u672C\u5168\u5C40\u641C\u7D22\u795E\u5668");
frame.setResizable(false);
frame.setBounds(100, 100, 531, 402);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);

textField = new JTextField();
textField.setBounds(10, 10, 368, 21);
frame.getContentPane().add(textField);
textField.setColumns(25);

textField_1 = new JTextField();
textField_1.setBounds(10, 41, 368, 21);
frame.getContentPane().add(textField_1);
textField_1.setColumns(25);

textArea = new TextArea();
textArea.setFont(new Font("华文楷体", Font.PLAIN, 14));
textArea.setBounds(10, 68, 495, 295);
frame.getContentPane().add(textArea);

Button button = new Button("\u9009\u62E9\u6587\u4EF6\uFF08\u5939\uFF09");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JFileChooser jf = new JFileChooser();
jf.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
jf.showDialog(null, null);
File file = jf.getSelectedFile();
try {
filePath = file.getAbsolutePath();
} catch (Exception e2) {
}
textField.setText(filePath);
}
});
button.setBounds(384, 8, 121, 23);
frame.getContentPane().add(button);

Button button_1 = new Button("\u5F00\u59CB\u641C\u7D22");
button_1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String keyWord = textField_1.getText().trim().toString();
if (keyWord == null || keyWord.equals("")) {
JOptionPane.showMessageDialog(null, "你还未输入搜索内容", "温馨提示", JOptionPane.INFORMATION_MESSAGE);
return;
}
filePath = textField.getText().trim().toString();
//				textArea.setText("测试"+filePath);
MySearchThread thread = new MySearchThread(filePath, keyWord);
thread.start();
}
});
button_1.setBounds(384, 39, 121, 23);
frame.getContentPane().add(button_1);
}

/**
* 文件搜索线程类
*
* @author shiweixian
*
*/
class MySearchThread extends Thread {

String filePath;
String keyWord;
List<File> list ;
public MySearchThread(String filePath, String keyWord) {
this.filePath = filePath;
this.keyWord = keyWord;
list = new ArrayList<>();
}

@Override
public void run() {
if (filePath == null || filePath.equals("")) {
JOptionPane.showMessageDialog(null, "无法找到该文件，请重新操作", "温馨提示", JOptionPane.INFORMATION_MESSAGE);
return;
}
File file = new File(filePath);
if (file.isFile()) {
ScannerFile(file); //搜索文件里的内容
}
else if(file.isDirectory()){
try {
getFilePath(file); //获得文件夹下的所有文件
} catch (NullPointerException e) {
JOptionPane.showMessageDialog(null, "路径不正确", "温馨提示", JOptionPane.INFORMATION_MESSAGE);
}
if(list != null){
for(int i = 0;i<list.size();i++){
textArea.append(list.get(i).getAbsolutePath()+":\n");
ScannerFile(list.get(i));
}
textArea.append("\r\n");
}
}
}

/**
* 扫描文件，搜索出想要的内容
*/
private void ScannerFile(File file){
try {
BufferedReader reader = new BufferedReader(new FileReader(file));
String temp;
int count = 1;
while ((temp = reader.readLine()) != null) {
if (temp.contains(keyWord))
textArea.append("\t第" + count + "行： " + temp + "\n");
count++;
}
reader.close();
} catch (FileNotFoundException e) {
JOptionPane.showMessageDialog(null, "无法找到该文件，请重新操作", "温馨提示", JOptionPane.INFORMATION_MESSAGE);
return;
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "很抱歉，搜索过程中出现错误", "错误", JOptionPane.INFORMATION_MESSAGE);
return;
}
}

/**
* 获取文件夹下所有子文件的路径（递归）
* @param file
*/
private void getFilePath(File file){
if(file.isFile())
list.add(file);
else if(file.isDirectory()){
File[] files = file.listFiles();
for(int i =0;i<files.length;i++){
getFilePath(files[i]);
}
}
}
}
}