使用java API如何實現zip遞歸壓縮和解壓文件夾的案例

public class ZipFile {
 public static void main(String[] args) throws IOException {
  
  //輸出壓縮包
  FileOutputStream fos = new FileOutputStream("src/main/resources/compressed.zip");
  ZipOutputStream zipOut = new ZipOutputStream(fos);

  //被壓縮文件
  File fileToZip = new File("src/main/resources/test1.txt");
  FileInputStream fis = new FileInputStream(fileToZip);
  
  //向壓縮包中添加文件
  ZipEntry zipEntry = new ZipEntry(fileToZip.getName());
  zipOut.putNextEntry(zipEntry);
  byte[] bytes = new byte[1024];
  int length;
  while((length = fis.read(bytes)) >= 0) {
   zipOut.write(bytes, 0, length);
  }
  zipOut.close();
  fis.close();
  fos.close();
 }
}

public class ZipMultipleFiles {
 public static void main(String[] args) throws IOException {
  List<String> srcFiles = Arrays.asList("src/main/resources/test1.txt", "src/main/resources/test2.txt");
  FileOutputStream fos = new FileOutputStream("src/main/resources/multiCompressed.zip");
  ZipOutputStream zipOut = new ZipOutputStream(fos);
  //向壓縮包中添加多個文件
  for (String srcFile : srcFiles) {
   File fileToZip = new File(srcFile);
   FileInputStream fis = new FileInputStream(fileToZip);
   ZipEntry zipEntry = new ZipEntry(fileToZip.getName());
   zipOut.putNextEntry(zipEntry);
 
   byte[] bytes = new byte[1024];
   int length;
   while((length = fis.read(bytes)) >= 0) {
    zipOut.write(bytes, 0, length);
   }
   fis.close();
  }
  zipOut.close();
  fos.close();
 }
}

public class ZipDirectory {
 public static void main(String[] args) throws IOException, FileNotFoundException {
  //被壓縮的文件夾
  String sourceFile = "src/main/resources/zipTest"; 
  //壓縮結果輸出，即壓縮包
  FileOutputStream fos = new FileOutputStream("src/main/resources/dirCompressed.zip");
  ZipOutputStream zipOut = new ZipOutputStream(fos);
  File fileToZip = new File(sourceFile);
  //遞歸壓縮文件夾
  zipFile(fileToZip, fileToZip.getName(), zipOut);
  //關閉輸出流
  zipOut.close();
  fos.close();
 }
  

 /**
  * 將fileToZip文件夾及其子目錄文件遞歸壓縮到zip文件中
  * @param fileToZip 遞歸當前處理對象，可能是文件夾，也可能是文件
  * @param fileName fileToZip文件或文件夾名稱
  * @param zipOut 壓縮文件輸出流
  * @throws IOException
  */
 private static void zipFile(File fileToZip, String fileName, ZipOutputStream zipOut) throws IOException {
  //不壓縮隱藏文件夾
  if (fileToZip.isHidden()) {
   return;
  }
  //判斷壓縮對象如果是一個文件夾
  if (fileToZip.isDirectory()) {
   if (fileName.endsWith("/")) {
    //如果文件夾是以“/”結尾，將文件夾作為壓縮箱放入zipOut壓縮輸出流
    zipOut.putNextEntry(new ZipEntry(fileName));
    zipOut.closeEntry();
   } else {
    //如果文件夾不是以“/”結尾，將文件夾結尾加上“/”之后作為壓縮箱放入zipOut壓縮輸出流
    zipOut.putNextEntry(new ZipEntry(fileName + "/"));
    zipOut.closeEntry();
   }
   //遍歷文件夾子目錄，進行遞歸的zipFile
   File[] children = fileToZip.listFiles();
   for (File childFile : children) {
    zipFile(childFile, fileName + "/" + childFile.getName(), zipOut);
   }
   //如果當前遞歸對象是文件夾，加入ZipEntry之后就返回
   return;
  }
  //如果當前的fileToZip不是一個文件夾，是一個文件，將其以字節碼形式壓縮到壓縮包里面
  FileInputStream fis = new FileInputStream(fileToZip);
  ZipEntry zipEntry = new ZipEntry(fileName);
  zipOut.putNextEntry(zipEntry);
  byte[] bytes = new byte[1024];
  int length;
  while ((length = fis.read(bytes)) >= 0) {
   zipOut.write(bytes, 0, length);
  }
  fis.close();
 }
}

public class UnzipFile {
 public static void main(String[] args) throws IOException {
  //被解壓的壓縮文件
  String fileZip = "src/main/resources/unzipTest/compressed.zip";
  //解壓的目標目錄
  File destDir = new File("src/main/resources/unzipTest");

  byte[] buffer = new byte[1024];
  ZipInputStream zis = new ZipInputStream(new FileInputStream(fileZip));
  //獲取壓縮包中的entry，并將其解壓
  ZipEntry zipEntry = zis.getNextEntry();
  while (zipEntry != null) {
   File newFile = newFile(destDir, zipEntry);
   FileOutputStream fos = new FileOutputStream(newFile);
   int len;
   while ((len = zis.read(buffer)) > 0) {
    fos.write(buffer, 0, len);
   }
   fos.close();
   //解壓完成一個entry，再解壓下一個
   zipEntry = zis.getNextEntry();
  }
  zis.closeEntry();
  zis.close();
 }
 //在解壓目標文件夾，新建一個文件
 public static File newFile(File destinationDir, ZipEntry zipEntry) throws IOException {
  File destFile = new File(destinationDir, zipEntry.getName());

  String destDirPath = destinationDir.getCanonicalPath();
  String destFilePath = destFile.getCanonicalPath();

  if (!destFilePath.startsWith(destDirPath + File.separator)) {
   throw new IOException("該解壓項在目標文件夾之外: " + zipEntry.getName());
  }

  return destFile;
 }
}