Java压缩文件操作详解

Java 压缩文件夹 Java压缩文件操作 Java压缩文件 2022-11-13 14:11:42 258人浏览安东尼

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摘要

目录一、题目描述-压缩文本文件1、题目2、解题思路3、代码详解二、题目描述-压缩文件解压到指定文件夹1、题目2、解题思路3、代码详解三、题目描述-压缩所有子文件夹1、题目2、解题思路

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;


public class ZipTextFileFrame extends JFrame {

    
    private static final long serialVersionUID = -8885017327239429018L;
    private JPanel contentPane;
    private JTextField chooseTextField;
    private JTable table;
    private File[] textFiles;

    
    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();
                }
            }
        });
    }

    
    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;


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;

    
    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();
                }
            }
        });
    }

    
    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;


public class ZipDirectoryFrame extends JFrame {

    
    private static final long serialVersionUID = -138842864977841594L;
    private JPanel contentPane;
    private JTextField chooseTextField;
    private JTable table;
    private File selectFile;

    
    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();
                }
            }
        });
    }

    
    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