java将多个txt文件合并成一个文件

package com.mingrisoft;import java.awt.BorderLayout;import java.awt.EventQueue;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.io.BufferedReader;import java.io.File;import java.io.FileFilter;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;import javax.swing.JButton;import javax.swing.JFileChooser;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.border.EmptyBorder;public class TextFileConcatenation extends JFrame { /** * */ private static final long serialVersionUID = 5224889437729791565L; private JPanel contentPane; private JTextField textField; private File[] textFiles; private JTextArea textArea; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { TextFileConcatenation frame = new TextFileConcatenation(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public TextFileConcatenation() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); contentPane.setLayout(new BorderLayout(0, 0)); setContentPane(contentPane); JPanel panel = new JPanel(); contentPane.add(panel, BorderLayout.NORTH); JLabel fileLabel = new JLabel("\u6587\u4EF6\u5939\u6240\u5728\u4F4D\u7F6E\uFF1A"); panel.add(fileLabel); textField = new JTextField(); panel.add(textField); textField.setColumns(10); JButton button = new JButton("\u9009\u62E9\u6587\u4EF6\u5939"); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { do_button_actionPerformed(e); } }); panel.add(button); JScrollPane scrollPane = new JScrollPane(); contentPane.add(scrollPane, BorderLayout.CENTER); textArea = new JTextArea(); scrollPane.setViewportView(textArea); JPanel buttonPanel = new JPanel(); contentPane.add(buttonPanel, BorderLayout.SOUTH); JButton concatButton = new JButton("\u5408\u5E76\u6587\u4EF6"); concatButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { do_concatButton_actionPerformed(e); } }); buttonPanel.add(concatButton); } protected void do_button_actionPerformed(ActionEvent e) { JFileChooser chooser = new JFileChooser(); chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY); chooser.setMultiSelectionEnabled(false); int result = chooser.showOpenDialog(this); if (result == JFileChooser.APPROVE_OPTION) { File selectFile = chooser.getSelectedFile(); textField.setText(selectFile.getAbsolutePath()); textFiles = selectFile.listFiles(new FileFilter() { @Override public boolean accept(File pathname) { if (pathname.getAbsolutePath().endsWith(".txt")) { return true; } else { return false; } } }); for (File textFile : textFiles) { textArea.append(textFile.getAbsolutePath() "\n\r"); } } } protected void do_concatButton_actionPerformed(ActionEvent e) { if (textFiles == null) { JOptionPane.showMessageDialog(this, "请选择文件文件位置！", "警告信息", JOptionPane.WARNING_MESSAGE); return; } if (textFiles.length == 0) { JOptionPane.showMessageDialog(this, "文件夹中不包括文本文件！", "警告信息", JOptionPane.WARNING_MESSAGE); return; } BufferedReader reader = null; FileWriter writer = null; try { writer = new FileWriter("d://concatenation.txt");// 创建文件输出流 for (File textFile : textFiles) {// 遍历用户选择的文本文件 reader = new BufferedReader(new FileReader(textFile));// 创建缓冲输入流 String line; while ((line = reader.readLine()) != null) { writer.write(line);// 将读入的数据写入到文件中 } } JOptionPane.showMessageDialog(this, "文件合并成功！", "提示信息", JOptionPane.INFORMATION_MESSAGE); return; } catch (IOException e1) { e1.printStackTrace(); } finally { if (writer != null) { try { writer.close(); } catch (IOException e1) { e1.printStackTrace(); } } if (reader != null) { try { reader.close(); } catch (IOException e1) { e1.printStackTrace(); } } } }}