ZIP是一种流行的文件压缩格式，它可以将多个文件打包成一个文件，以减小文件大小并方便传输。ZIP文件可以在大多数操作系统和软件中解压缩，例如Windows、Mac和Linux系统上的许多文件管理器和解压缩工具。ZIP压缩可以使用许多不同的压缩算法，包括DEFLATE、LZMA和BZIP2。ZIP文件还支持文件加密和分卷压缩，可以方便地将大文件分成多个部分。

        下面我们来一起实现一下ZIP压缩算法：

package com.xxx.utils;import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;/*** @author tobiasy* @date 2021/2/6*/
public class ZipUtils {public static void main(String[] args) {File file = new File("F:\\test\\xxx");zip(file);}public static void unzip(File file) {try {ZipFile zipFile = new ZipFile(file, Charset.forName("gbk"));String targetContent = toCurrContent(file);FileCreator.createFile(targetContent, File::mkdir);Enumeration<? extends ZipEntry> entries;for (entries = zipFile.entries(); entries.hasMoreElements(); ) {ZipEntry zipEntry = entries.nextElement();File targetFile = new File(targetContent + "/" + zipEntry.getName());if (zipEntry.isDirectory()) {FileCreator.createFile(targetContent, File::mkdir);} else {FileCreator.newDirsFile(targetFile);FileOutputStream os = new FileOutputStream(targetFile);InputStream is = zipFile.getInputStream(zipEntry);FileUtils.write(is, os);}}} catch (Exception e) {e.printStackTrace();}}public static void zip(File dir) {try {String zipPath = toCurrZip(dir);File targetFile = new File(zipPath);FileOutputStream os = new FileOutputStream(targetFile);ZipOutputStream zos = new ZipOutputStream(os);if (dir.isDirectory()) {addZipDir(dir, dir, zos);}zos.close();} catch (Exception e) {e.printStackTrace();}}private static void addZipDir(File dir, File subFile, ZipOutputStream zos) {try {File[] files = subFile.listFiles();if (files == null) {return;}for (File file : files) {if (file.isFile()) {String path = file.getPath();String entryName = getZipEntryName(dir.getPath(), path);System.out.println(entryName);zos.putNextEntry(new ZipEntry(entryName));FileInputStream is = new FileInputStream(file);FileUtils.write(is, zos);zos.closeEntry();is.close();} else {addZipDir(dir, file, zos);}}} catch (Exception e) {e.printStackTrace();}}private static String getZipEntryName(String basePath, String subFilePath) {String entryName = subFilePath.replace(basePath, "");String[] ss = new String[]{"/", "\\"};for (String s : ss) {if (entryName.startsWith(s)) {return entryName.substring(s.length());}}return entryName;}private static String toCurrContent(File file) {return file.getPath().replace(FileUtils.getFileSuffix(file.getPath()), "");}private static String toCurrZip(File dir) {return dir.getPath() + ".zip";}
}