Java实现大文件的分割与合并的方法详解

package com.xiaoxuzhu; 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; /** * Description: 合并多个文本文件工具 * * @author xiaoxuzhu * @version 1.0 * * 
 * 修改记录: * 修改后版本	        修改人		修改日期			修改内容 * 2022/5/3.1	    xiaoxuzhu		2022/5/3		    Create * 
 * @date 2022/5/3 */ public class TextFileConcatenation extends JFrame { /** * */ 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("文件夹所在位置"); panel.add(fileLabel); textField = new JTextField(); panel.add(textField); textField.setColumns(10); JButton button = new JButton("选择文件夹"); 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("合并文件"); 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(); } } } } } 

package com.xiaoxuzhu; import java.awt.EventQueue; import java.awt.FileDialog; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import java.io.File; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.border.EmptyBorder; /** * Description: 对大文件进行分割处理 * * @author xiaoxuzhu * @version 1.0 * * 
 * 修改记录: * 修改后版本	        修改人		修改日期			修改内容 * 2022/5/3.1	    xiaoxuzhu		2022/5/3		    Create * 
 * @date 2022/5/3 */ public class ComminuteFrame extends JFrame { /** * */ private static final long serialVersionUID = 2547743180459668116L; private JPanel contentPane; private JTextField sourceTextField; private JTextField sizeTextField; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { ComminuteFrame frame = new ComminuteFrame(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public ComminuteFrame() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 430, 211); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null); setTitle("文件分割"); JPanel panel = new JPanel(); panel.setBounds(0, 0, 414, 181); contentPane.add(panel); panel.setLayout(null); JLabel messagelabel = new JLabel("源文件："); messagelabel.setBounds(47, 41, 54, 20); panel.add(messagelabel); sourceTextField = new JTextField(); sourceTextField.setBounds(105, 41, 178, 21); panel.add(sourceTextField); sourceTextField.setColumns(10); JButton sourceButton = new JButton("选择"); sourceButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { do_sourceButton_actionPerformed(arg0); } }); sourceButton.setBounds(303, 40, 67, 23); panel.add(sourceButton); JLabel sizelabel = new JLabel("分割大小："); sizelabel.setBounds(34, 86, 67, 15); panel.add(sizelabel); sizeTextField = new JTextField(); sizeTextField.setBounds(105, 83, 178, 21); panel.add(sizeTextField); sizeTextField.setColumns(10); sizeTextField.addKeyListener(new KeyAdapter() { @Override public void keyTyped(KeyEvent event) { // 某键按下时调用的方法 char ch = event.getKeyChar(); // 获取用户键入的字符 if ((ch <'0' || ch > '9')) { // 如果用户输入的信息不为数字或小数 event.consume(); // 不允许用户键入 } } }); JLabel lblM = new JLabel("M"); lblM.setBounds(313, 86, 44, 15); panel.add(lblM); JButton cominButton = new JButton("分割"); cominButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { do_cominButton_actionPerformed(arg0); } }); cominButton.setBounds(101, 138, 93, 23); panel.add(cominButton); JButton close = new JButton("退出"); close.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { do_close_actionPerformed(arg0); } }); close.setBounds(229, 138, 93, 23); panel.add(close); } protected void do_sourceButton_actionPerformed(ActionEvent arg0) { java.awt.FileDialog fd = new FileDialog(this); fd.setVisible(true); String path = fd.getDirectory() + fd.getFile(); if (!path.equals("") && !(path == null)) { sourceTextField.setText(path); } } protected void do_cominButton_actionPerformed(ActionEvent arg0) { ComminuteUtil util = new ComminuteUtil(); String path = sourceTextField.getText(); int size = Integer.parseInt(sizeTextField.getText()); String subPath = path.substring(0, path.lastIndexOf("\\")); util.fenGe(new File(path), new File(subPath), size); JOptionPane.showMessageDialog(getContentPane(), "文件分割成功！", "信息提示框", JOptionPane.PLAIN_MESSAGE); } protected void do_close_actionPerformed(ActionEvent arg0) { System.exit(0); } }

package com.xiaoxuzhu; import java.io.*; /** * Description: * * @author xiaoxuzhu * @version 1.0 * * 
 * 修改记录: * 修改后版本	        修改人		修改日期			修改内容 * 2022/5/3.1	    xiaoxuzhu		2022/5/3		    Create * 
 * @date 2022/5/3 */ public class ComminuteUtil { // 实现文件分割方法 public void fenGe(File commFile, File untieFile, int filesize) { FileInputStream fis = null; int size = 1024 * 1024; // 用来指定分割文件要以MB为单位 try { if (!untieFile.isDirectory()) { // 如果要保存分割文件地址不是路径 untieFile.mkdirs(); // 创建该路径 } size = size * filesize; int length = (int) commFile.length(); // 获取文件大小 int num = length / size; // 获取文件大小除以MB的得数 int yu = length % size; // 获取文件大小与MB相除的余数 String newfengeFile = commFile.getAbsolutePath(); // 获取保存文件的完成路径信息 int fileNew = newfengeFile.lastIndexOf("."); String strNew = newfengeFile.substring(fileNew, newfengeFile.length()); // 截取字符串 fis = new FileInputStream(commFile); // 创建FileInputStream类对象 File[] fl = new File[num + 1]; // 创建文件数组 int begin = 0; for (int i = 0; i 

package com.xiaoxuzhu; import java.awt.EventQueue; import java.awt.FileDialog; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.File; import java.util.ArrayList; import java.util.List; 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.border.EmptyBorder; /** * Description: * * @author xiaoxuzhu * @version 1.0 * * 
 * 修改记录: * 修改后版本	        修改人		修改日期			修改内容 * 2022/5/3.1	    xiaoxuzhu		2022/5/3		    Create * 
 * @date 2022/5/3 */ public class UniteFrame extends JFrame { /** * */ private JPanel contentPane; JList fileList = new JList(); DefaultListModel listModel = new DefaultListModel(); String folder = ""; String fileName = ""; List listPath = new ArrayList(); /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { UniteFrame frame = new UniteFrame(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public UniteFrame() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 425, 300); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null); setTitle("文件合并"); JPanel panel = new JPanel(); panel.setBounds(0, 0, 409, 262); contentPane.add(panel); panel.setLayout(null); JScrollPane scrollPane = new JScrollPane(); scrollPane.setBounds(33, 51, 311, 151); panel.add(scrollPane); fileList.setModel(listModel); scrollPane.setViewportView(fileList); JLabel messagelabel = new JLabel("要进行合并的文件列表："); messagelabel.setBounds(33, 20, 156, 21); panel.add(messagelabel); JButton openButton = new JButton("打开"); openButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { do_openButton_actionPerformed(arg0); } }); openButton.setBounds(43, 218, 68, 23); panel.add(openButton); JButton uniteButton = new JButton("合并"); uniteButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { do_uniteButton_actionPerformed(arg0); } }); uniteButton.setBounds(152, 218, 68, 23); panel.add(uniteButton); JButton closeButton = new JButton("退出"); closeButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { do_closeButton_actionPerformed(arg0); } }); closeButton.setBounds(258, 218, 68, 23); panel.add(closeButton); } // 打开按钮的单击事件 @SuppressWarnings("rawtypes") protected void do_openButton_actionPerformed(ActionEvent arg0) { java.awt.FileDialog fd = new FileDialog(this); fd.setVisible(true); folder = fd.getDirectory(); String path = fd.getDirectory() + fd.getFile(); fileName = fd.getFile(); UniteUtil util = new UniteUtil(); if (path.endsWith(".tem")) { List list = util.getList(folder); for (int i = 0; i 

package com.xiaoxuzhu; import java.io.*; import java.util.*; /** * Description: * * @author xiaoxuzhu * @version 1.0 * * 
 * 修改记录: * 修改后版本	        修改人		修改日期			修改内容 * 2022/5/3.1	    xiaoxuzhu		2022/5/3		    Create * 
 * @date 2022/5/3 */ public class UniteUtil { /** * @param file *            :要进行合并的文件数组对象 * @param cunDir *            ：合并后文件的保存路径 * @param hz *            ：合并后文件的格式 */ public void unite(File[] file, File cunDir, String hz) { try { File heBingFile = new File(cunDir.getAbsoluteFile() + "\\UNTIE" + hz); // 指定分割后文件的文件名 if (!heBingFile.isFile()) { heBingFile.createNewFile(); } FileOutputStream fos = new FileOutputStream(heBingFile); // 创建FileOutputStream对象 for (int i = 0; i  getList(String path) { LinkedList list = new LinkedList(); ArrayList listPath = new ArrayList(); File dir = new File(path); File file[] = dir.listFiles(); for (int i = 0; i 

String newName = fileName.substring(fileName.indexOf("."), fileName.lastIndexOf("."));