java zip压缩与解压-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_36750461/article/details/87600495

本文介绍了一个Java实现的Zip文件压缩与解压工具类，详细展示了如何使用该工具进行文件的压缩和解压操作，包括处理文件目录、设置缓冲区大小等功能。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

package com.cvicse.bankface.sd.util;

import java.io.*;
import org.apache.tools.zip.*;
import java.util.Enumeration;

/**
* 实现文件的压缩解压（.zip）
*/
public class AntZip {

   private ZipFile zipFile;
   private ZipOutputStream zipOut; // 压缩Zip
   private ZipEntry zipEntry;
   private static int bufSize; // size of bytes
   private byte[] buf;
   private int readedBytes;

   public AntZip() {
       this(512);
   }

   public AntZip(int bufSize) {
       this.bufSize = bufSize;
       this.buf = new byte[this.bufSize];
   }

   /**
   * 压缩指定文件
   *
   * @param fileName
   * 要压缩的文件名
   * @param zipFileName
   * 压缩后生成的zip文件名
   */
   public void doZip(String fileName, String zipFileName) {// fileName:需要压缩的文件名

       File zipDir;
       zipDir = new File(fileName);
       try {
           File file = new File(zipFileName);
           // 如果指定文件的目录不存在,则创建之.
           File parent = file.getParentFile();
           if (!parent.exists()) {
               parent.mkdirs();
           }

           this.zipOut = new ZipOutputStream(new BufferedOutputStream(
                   new FileOutputStream(zipFileName)));
           handleDir(zipDir, this.zipOut);
           this.zipOut.close();
       } catch (IOException ioe) {
           ioe.printStackTrace();
       }
   }

   // 由doZip调用,写入压缩文件
   private void handleDir(File fileName, ZipOutputStream zipOut)
           throws IOException {
       FileInputStream fileIn;

       fileIn = new FileInputStream(fileName);//要压缩的文件
       int beginIndex = fileName.toString().lastIndexOf("\\") + 1;
       String zipFileName = fileName.toString().substring(beginIndex);
       this.zipOut.putNextEntry(new ZipEntry(zipFileName));

       while ((this.readedBytes = fileIn.read(this.buf)) > 0) {
           this.zipOut.write(this.buf, 0, this.readedBytes);
       }

this.zipOut.closeEntry();

}

   // 解压指定zip文件
   public void unZip(String absoluteFromFileName, String absoluteToDirectory) {// 需要解压的zip文件名
       FileOutputStream fileOut;
       File file;
       InputStream inputStream;

try {

this.zipFile = new ZipFile(absoluteFromFileName);

           for (Enumeration entries = this.zipFile.getEntries(); entries
                   .hasMoreElements();) {
               ZipEntry entry = (ZipEntry) entries.nextElement();
               String name = entry.getName();
               String absoluteUnZipFileName = absoluteToDirectory+ name;// 解压后的文件绝对路径
               file = new File(absoluteUnZipFileName);

               if (entry.isDirectory()) {
                   file.mkdirs();
               } else {
                   // 如果指定文件的目录不存在,则创建之.
                   File parent = file.getParentFile();
                   if (!parent.exists()) {
                       parent.mkdirs();
                   }

inputStream = zipFile.getInputStream(entry);

                   fileOut = new FileOutputStream(file);
                   while ((this.readedBytes = inputStream.read(this.buf)) > 0) {
                       fileOut.write(this.buf, 0, this.readedBytes);
                   }
                   fileOut.close();

                   inputStream.close();
               }
           }

           this.zipFile.close();
       } catch (IOException ioe) {
           ioe.printStackTrace();
       }
   }

   // 设置缓冲区大小
   public void setBufSize(int bufSize) {
       this.bufSize = bufSize;
   }
}