Example of how to compress and decompress files in Java

This article shares with you how to compress/decompress files in Java through example code. Friends who need it can refer to it

Compress/decompress files using java:

import java.io.*; 
import java.awt.*; 
import java.awt.event.*; 
import java.util.*; 
import java.util.zip.*; 
import javax.swing.*; 
//从压缩包中提取文件 
public class ZipExtractDemo extends JFrame{ 
  JFileChooser fileChooser; //文件选择器 
  JTextField jtfTarget; //待解压文件路径 
  JButton jbSelected; //选择文件按钮 
  JList files; //信息显示列表框 
  JButton jbExtract; //解压按钮 
  ZipFile zFile;  
  public ZipExtractDemo(){ 
    super("从压缩包中提取文件"); //调用父类构造函数 
    fileChooser=new JFileChooser(); //实例化组件 
    jtfTarget=new JTextField(13); 
    jbSelected=new JButton("选择"); 
    jbExtract=new JButton("解压"); 
    files=new JList(); 
    JPanel panel=new JPanel(); //实例化面板 
    panel.add(new JLabel("目标文件")); 
    panel.add(jtfTarget); //增加组件到面板上 
    panel.add(jbSelected); 
    panel.add(jbExtract); 
    JScrollPane jsp=new JScrollPane(files); 
    jsp.setBorder(BorderFactory.createEmptyBorder(10,10,10,10)); //设置边界 
    Container container=getContentPane(); //得以容器 
    container.add(panel,BorderLayout.NORTH); //增加组件到容器上 
    container.add(jsp,BorderLayout.CENTER); 
    jbSelected.addActionListener(new ActionListener(){ //文件选择按钮事件处理 
      public void actionPerformed(ActionEvent event) { 
        if (fileChooser.showOpenDialog(ZipExtractDemo.this)==JFileChooser.APPROVE_OPTION){ //弹出文件选择器,并判断是否点击了打开按钮 
          String fileName=fileChooser.getSelectedFile().getAbsolutePath();  //得到选择文件的绝对路径 
          jtfTarget.setText(fileName); //设置目标文件名 
          showFiles(); //显示压缩包内容 
      } 
      } 
    }); 
    jbExtract.addActionListener(new ActionListener(){  //解村文件按钮事件处理 
      public void actionPerformed(ActionEvent event) {  
          extractFile(files.getSelectedValue().toString()); //解压指定文件 
      } 
    }); 
    setSize(350,250);  //设置窗口尺寸 
    setVisible(true);  //设置窗口可视 
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //关闭窗口时退出程序 
  } 
  public void showFiles(){ 
    try{ 
    zFile=new ZipFile(jtfTarget.getText()); //得到压缩文件实例 
    ZipEntry entry; 
    Vector vec=new Vector(); //文件枚举 
      Enumeration enu=zFile.entries(); //得到压缩条目的枚举对象 
      while (enu.hasMoreElements()){ //依次枚举条目 
        entry=(ZipEntry) enu.nextElement(); //得到压缩条目 
        vec.add(entry.getName());  //增加文件到Vector内    
      } 
      files.setListData(vec); //设置文件列表框数据 
      files.getSelectedValues(); 
    } 
    catch (Exception ex){ 
      ex.printStackTrace(); //输出错误信息 
    }     
  } 
  public void extractFile(String name){ //解压文件 
    try{ 
    ZipEntry entry=zFile.getEntry(name);  
    entry.getComment(); 
    entry.getCompressedSize(); 
    entry.getCrc(); 
    entry.isDirectory(); 
    entry.getSize(); 
    entry.getMethod(); 
    InputStream in=zFile.getInputStream(entry); //得到文件输入流 
    File file=new File(name); //实例化文件对象 
    FileOutputStream out=new FileOutputStream(file); //得到文件输出流 
    byte[] buffer=new byte[1024]; //缓冲区大小 
    int length; 
    while((length = in.read(buffer)) != -1) { //循环读取数据 
      out.write(buffer, 0, length); //写数据到输出流 
    } 
      JOptionPane.showMessageDialog(ZipExtractDemo.this,"解压成功,解压到："+file.getAbsolutePath());  
    in.close(); //关闭输入流 
    out.close(); //关闭输出流   
    } catch (Exception ex){} 
  } 
  public static void main(String[] args){ 
    new ZipExtractDemo(); 
  } 
}

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