Java压缩文件
小虚竹and掘金 人气:0一、题目描述-压缩文本文件
1、题目
题目:使用文本压缩技术,可以节约磁盘空间,还便于管理。
实现:做一个压缩指定文件夹内的所有文本文件的工具。
2、解题思路
创建一个类:ZipTextFileFrame
使用ZipTextFileFrame继承JFrame构建窗体
压缩文件主要用到压缩输出流ZipOutputStream
以zip文件格式写入文件实现输出流过滤器。
每一个文件在压缩过程中会被存到zipEntry
使用putNextEntry()方法,增加zipEntry
压缩文件会放在选择文件夹的同级目录,并以java.zip命名。
3、代码详解
package com.xiaoxuzhu; import java.awt.BorderLayout; import java.awt.EventQueue; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.File; import java.io.FileFilter; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.util.zip.ZipEntry; import java.util.zip.ZipOutputStream; import javax.swing.JButton; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.JTextField; import javax.swing.border.EmptyBorder; import javax.swing.table.DefaultTableModel; /** * Description: * * @author xiaoxuzhu * @version 1.0 * * <pre> * 修改记录: * 修改后版本 修改人 修改日期 修改内容 * 2022/5/4.1 xiaoxuzhu 2022/5/4 Create * </pre> * @date 2022/5/4 */ public class ZipTextFileFrame extends JFrame { /** * */ private static final long serialVersionUID = -8885017327239429018L; private JPanel contentPane; private JTextField chooseTextField; private JTable table; private File[] textFiles; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { ZipTextFileFrame frame = new ZipTextFileFrame(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public ZipTextFileFrame() { setTitle("压缩所有文本文件"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(new BorderLayout(0, 0)); JPanel choosePanel = new JPanel(); contentPane.add(choosePanel, BorderLayout.NORTH); chooseTextField = new JTextField(); choosePanel.add(chooseTextField); chooseTextField.setColumns(18); JButton chooseButton = new JButton("选择文件夹"); chooseButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { do_chooseButton_actionPerformed(arg0); } }); choosePanel.add(chooseButton); JPanel buttonPanel = new JPanel(); contentPane.add(buttonPanel, BorderLayout.SOUTH); JButton zipButton = new JButton("开始压缩"); zipButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { do_zipButton_actionPerformed(arg0); } }); buttonPanel.add(zipButton); JScrollPane scrollPane = new JScrollPane(); contentPane.add(scrollPane, BorderLayout.CENTER); table = new JTable(); scrollPane.setViewportView(table); } protected void do_chooseButton_actionPerformed(ActionEvent arg0) { JFileChooser fileChooser = new JFileChooser(); fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY); fileChooser.setMultiSelectionEnabled(false); int result = fileChooser.showOpenDialog(this); if (result == JFileChooser.APPROVE_OPTION) { File selectFile = fileChooser.getSelectedFile(); chooseTextField.setText(selectFile.getAbsolutePath()); textFiles = selectFile.listFiles(new FileFilter() { @Override public boolean accept(File file) { if (file.getPath().endsWith(".txt")) { return true; } return false; } }); DefaultTableModel model = (DefaultTableModel) table.getModel(); model.setColumnIdentifiers(new Object[] { "序号", "文件名" }); for (int i = 0; i < textFiles.length; i++) { model.addRow(new Object[] { i + 1, textFiles[i].getName() }); } table.setModel(model); } } protected void do_zipButton_actionPerformed(ActionEvent arg0) { if (chooseTextField.getText().length() == 0) { JOptionPane.showMessageDialog(this, "请选择要压缩的文件夹", "", JOptionPane.WARNING_MESSAGE); return; } String zipFilePath = new File(chooseTextField.getText()).getParent(); try { zipFile(textFiles, new File(zipFilePath + File.separator + "java.zip")); JOptionPane.showMessageDialog(this, "完成压缩"); } catch (IOException e) { e.printStackTrace(); } } private static void zipFile(File[] files, File targetZipFile) throws IOException { // 利用给定的targetZipFile对象创建文件输出流对象 FileOutputStream fos = new FileOutputStream(targetZipFile); ZipOutputStream zos = new ZipOutputStream(fos);// 利用文件输出流创建压缩输出流 byte[] buffer = new byte[1024];// 创建写入压缩文件的数组 for (File file : files) {// 遍历全部文件 ZipEntry entry = new ZipEntry(file.getName());// 利用每个文件的名字创建ZipEntry对象 FileInputStream fis = new FileInputStream(file);// 利用每个文件创建文件输入流对象 zos.putNextEntry(entry);// 在压缩文件中添加一个ZipEntry对象 int read = 0; while ((read = fis.read(buffer)) != -1) { zos.write(buffer, 0, read);// 将输入写入到压缩文件 } zos.closeEntry();// 关闭ZipEntry fis.close();// 释放资源 } zos.close(); fos.close(); } }
压缩成功:
查看压缩结果:
二、题目描述-压缩文件解压到指定文件夹
1、题目
题目:实现一个压缩文件解压到指定文件夹的工具
2、解题思路
创建一个类:UnZipTextFileFrame
先获取一个zip格式的压缩文件
再指定要解压缩存放的文件夹
使用JAVA自带的压缩工具包来实现解压缩功能
利用用户选择的ZIP文件创建ZipFile对象
遍历ZipFile对象的枚举变量, 获得ZipEntry对象
获得的ZipEntry对象的输入流,将输入流写入到本地文件,这样就达到了解压缩功能。
3、代码详解
package com.xiaoxuzhu; import java.awt.BorderLayout; import java.awt.EventQueue; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.util.Enumeration; import java.util.zip.ZipEntry; import java.util.zip.ZipException; import java.util.zip.ZipFile; import javax.swing.JButton; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.JTextField; import javax.swing.border.EmptyBorder; import javax.swing.filechooser.FileNameExtensionFilter; import javax.swing.table.DefaultTableModel; /** * Description: * * @author xiaoxuzhu * @version 1.0 * * <pre> * 修改记录: * 修改后版本 修改人 修改日期 修改内容 * 2022/5/4.1 xiaoxuzhu 2022/5/4 Create * </pre> * @date 2022/5/4 */ public class UnZipTextFileFrame extends JFrame { /** * */ private static final long serialVersionUID = -7525621255251725313L; private JPanel contentPane; private JTextField sourceTextField; private JTable table; private File zipFile; private JTextField targetTextField; private File targetFile; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { UnZipTextFileFrame frame = new UnZipTextFileFrame(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public UnZipTextFileFrame() { setTitle("压缩文件解压到指定文件夹"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(new BorderLayout(0, 0)); JPanel choosePanel = new JPanel(); contentPane.add(choosePanel, BorderLayout.NORTH); sourceTextField = new JTextField(); choosePanel.add(sourceTextField); sourceTextField.setColumns(10); JButton sourceButton = new JButton("Zip文件"); sourceButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { do_sourceButton_actionPerformed(arg0); } }); choosePanel.add(sourceButton); targetTextField = new JTextField(); choosePanel.add(targetTextField); targetTextField.setColumns(10); JButton targetButton = new JButton("解压到"); targetButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { do_targetButton_actionPerformed(arg0); } }); choosePanel.add(targetButton); JPanel buttonPanel = new JPanel(); contentPane.add(buttonPanel, BorderLayout.SOUTH); JButton unzipButton = new JButton("开始解压缩"); unzipButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { do_unzipButton_actionPerformed(arg0); } }); buttonPanel.add(unzipButton); JScrollPane scrollPane = new JScrollPane(); contentPane.add(scrollPane, BorderLayout.CENTER); table = new JTable(); scrollPane.setViewportView(table); } protected void do_sourceButton_actionPerformed(ActionEvent arg0) { JFileChooser fileChooser = new JFileChooser(); fileChooser.setFileFilter(new FileNameExtensionFilter("文本文件", "zip")); fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY); int result = fileChooser.showOpenDialog(this); if (result == JFileChooser.APPROVE_OPTION) { zipFile = fileChooser.getSelectedFile(); sourceTextField.setText(zipFile.getAbsolutePath()); } } protected void do_targetButton_actionPerformed(ActionEvent arg0) { JFileChooser fileChooser = new JFileChooser(); fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY); int result = fileChooser.showOpenDialog(this); if (result == JFileChooser.APPROVE_OPTION) { targetFile = fileChooser.getSelectedFile(); targetTextField.setText(targetFile.getAbsolutePath()); } } @SuppressWarnings("rawtypes") protected void do_unzipButton_actionPerformed(ActionEvent arg0) { DefaultTableModel model = (DefaultTableModel) table.getModel();// 获得表格模型 model.setColumnIdentifiers(new Object[] { "序号", "文件名" });// 设置表头 int id = 1;// 声明序号变量 ZipFile zf = null; try { zf = new ZipFile(zipFile);// 利用用户选择的ZIP文件创建ZipFile对象 Enumeration e = zf.entries();// 创建枚举变量 while (e.hasMoreElements()) {// 遍历枚举变量 ZipEntry entry = (ZipEntry) e.nextElement();// 获得ZipEntry对象 if (!entry.getName().endsWith(".txt")) {// 如果不是文本文件就不进行解压缩 continue; } // 利用用户选择的文件夹和ZipEntry对象名称创建解压后的文件 File currentFile = new File(targetFile + File.separator + entry.getName()); FileOutputStream out = new FileOutputStream(currentFile); InputStream in = zf.getInputStream(entry);// 利用获得的ZipEntry对象的输入流 int buffer = 0; while ((buffer = in.read()) != -1) {// 将输入流写入到本地文件 out.write(buffer); } model.addRow(new Object[] { id++, currentFile.getName() });// 增加一行表格数据 in.close();// 释放资源 out.close(); } table.setModel(model);// 更新表格 JOptionPane.showMessageDialog(this, "解压缩完成");// 提示用户解压缩完成 } catch (ZipException e) {// 捕获异常 e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if (zf != null) { try { zf.close(); } catch (IOException e) { e.printStackTrace(); } } } } }
解压成功:
三、题目描述-压缩所有子文件夹
1、题目
题目:做一个压缩所有子文件夹的工具
2、解题思路
创建一个类:ZipDirectoryFrame
使用ZipDirectoryFrame继承JFrame构建窗体
压缩包含子文件夹的文件夹方案和压缩全是文件的文件夹类似,区别在如果找出包含子文件夹的文件夹所有文件。
并且构造ZipEntry时,不要有重名的情况。
可以用要压缩文件夹中所有文件的相对路径来做区分。
ZipEntry entry = new ZipEntry(string.substring(base.length() + 1, string.length()));// 利用要压缩文件的相对路径创建ZipEntry对象
压缩文件会放在选择文件夹的同级目录,并以选择文件夹的文件夹名+“.zip”命名。
3、代码详解
package com.xiaoxuzhu; import java.awt.BorderLayout; import java.awt.EventQueue; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.util.ArrayList; import java.util.List; import java.util.zip.ZipEntry; import java.util.zip.ZipOutputStream; import javax.swing.JButton; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.JTextField; import javax.swing.border.EmptyBorder; import javax.swing.table.DefaultTableModel; /** * Description: 压缩所有子文件夹 * * @author xiaoxuzhu * @version 1.0 * * <pre> * 修改记录: * 修改后版本 修改人 修改日期 修改内容 * 2022/5/4.1 xiaoxuzhu 2022/5/4 Create * </pre> * @date 2022/5/4 */ public class ZipDirectoryFrame extends JFrame { /** * */ private static final long serialVersionUID = -138842864977841594L; private JPanel contentPane; private JTextField chooseTextField; private JTable table; private File selectFile; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { ZipDirectoryFrame frame = new ZipDirectoryFrame(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public ZipDirectoryFrame() { setTitle("压缩所有子文件夹"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(new BorderLayout(0, 0)); JPanel choosePanel = new JPanel(); contentPane.add(choosePanel, BorderLayout.NORTH); chooseTextField = new JTextField(); choosePanel.add(chooseTextField); chooseTextField.setColumns(18); JButton chooseButton = new JButton("选择文件夹"); chooseButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { do_chooseButton_actionPerformed(arg0); } }); choosePanel.add(chooseButton); JPanel buttonPanel = new JPanel(); contentPane.add(buttonPanel, BorderLayout.SOUTH); JButton zipButton = new JButton("开始压缩"); zipButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { do_zipButton_actionPerformed(arg0); } }); buttonPanel.add(zipButton); JScrollPane scrollPane = new JScrollPane(); contentPane.add(scrollPane, BorderLayout.CENTER); table = new JTable(); scrollPane.setViewportView(table); } protected void do_chooseButton_actionPerformed(ActionEvent arg0) { JFileChooser fileChooser = new JFileChooser(); fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY); fileChooser.setMultiSelectionEnabled(false); int result = fileChooser.showOpenDialog(this); if (result == JFileChooser.APPROVE_OPTION) { selectFile = fileChooser.getSelectedFile(); chooseTextField.setText(selectFile.getAbsolutePath()); } } protected void do_zipButton_actionPerformed(ActionEvent arg0) { List<String> path = new ArrayList<String>(); getPath(selectFile, path); DefaultTableModel model = (DefaultTableModel) table.getModel(); model.setColumnIdentifiers(new Object[] { "序号", "文件" }); int id = 1; for (String string : path) { model.addRow(new Object[] { id++, new File(string).getName() }); } String targetZipFilePath = selectFile.getParent() +File.separator + selectFile.getName() + ".zip"; try { zipFile(path, new File(targetZipFilePath), selectFile.getAbsolutePath()); JOptionPane.showMessageDialog(this, "文件夹压缩成功"); } catch (IOException e) { e.printStackTrace(); } } private static void getPath(File rootFile, List<String> path) { File[] files = rootFile.listFiles(); for (File file : files) { if (file.isDirectory()) { getPath(file, path); } else { path.add(file.getAbsolutePath()); } } } private void zipFile(List<String> path, File targetZipFile, String base) throws IOException { // 根据给定的targetZipFile创建文件输出流对象 FileOutputStream fos = new FileOutputStream(targetZipFile); ZipOutputStream zos = new ZipOutputStream(fos);// 利用文件输出流对象创建Zip输出流对象 byte[] buffer = new byte[1024]; for (String string : path) {// 遍历所有要压缩文件的路径 File currentFile = new File(string); ZipEntry entry = new ZipEntry(string.substring(base.length() + 1, string.length()));// 利用要压缩文件的相对路径创建ZipEntry对象 FileInputStream fis = new FileInputStream(currentFile); zos.putNextEntry(entry); int read = 0; while ((read = fis.read(buffer)) != -1) {// 将数据写入到Zip输出流中 zos.write(buffer, 0, read); } zos.closeEntry();// 关闭ZipEntry对象 fis.close(); } zos.close();// 释放资源 fos.close(); } }
选择文件夹
要压缩的文件夹是上面两个例子的文件夹
压缩成功:
压缩结果:
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