java API实现zip递归压缩文件夹及解压 使用java API实现zip递归压缩和解压文件夹（java面试题）

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public class ZipFile {
 public static void main(String[] args) throws IOException {
  
  //输出压缩包
  FileOutputStream fos = new FileOutputStream("src/main/resources/compressed.zip");
  ZipOutputStream zipOut = new ZipOutputStream(fos);

  //被压缩文件
  File fileToZip = new File("src/main/resources/test1.txt");
  FileInputStream fis = new FileInputStream(fileToZip);
  
  //向压缩包中添加文件
  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);
  //向压缩包中添加多个文件
  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 {
  //被压缩的文件夹
  String sourceFile = "src/main/resources/zipTest"; 
  //压缩结果输出，即压缩包
  FileOutputStream fos = new FileOutputStream("src/main/resources/dirCompressed.zip");
  ZipOutputStream zipOut = new ZipOutputStream(fos);
  File fileToZip = new File(sourceFile);
  //递归压缩文件夹
  zipFile(fileToZip, fileToZip.getName(), zipOut);
  //关闭输出流
  zipOut.close();
  fos.close();
 }
  

 /**
  * 将fileToZip文件夹及其子目录文件递归压缩到zip文件中
  * @param fileToZip 递归当前处理对象，可能是文件夹，也可能是文件
  * @param fileName fileToZip文件或文件夹名称
  * @param zipOut 压缩文件输出流
  * @throws IOException
  */
 private static void zipFile(File fileToZip, String fileName, ZipOutputStream zipOut) throws IOException {
  //不压缩隐藏文件夹
  if (fileToZip.isHidden()) {
   return;
  }
  //判断压缩对象如果是一个文件夹
  if (fileToZip.isDirectory()) {
   if (fileName.endsWith("/")) {
    //如果文件夹是以“/”结尾，将文件夹作为压缩箱放入zipOut压缩输出流
    zipOut.putNextEntry(new ZipEntry(fileName));
    zipOut.closeEntry();
   } else {
    //如果文件夹不是以“/”结尾，将文件夹结尾加上“/”之后作为压缩箱放入zipOut压缩输出流
    zipOut.putNextEntry(new ZipEntry(fileName + "/"));
    zipOut.closeEntry();
   }
   //遍历文件夹子目录，进行递归的zipFile
   File[] children = fileToZip.listFiles();
   for (File childFile : children) {
    zipFile(childFile, fileName + "/" + childFile.getName(), zipOut);
   }
   //如果当前递归对象是文件夹，加入ZipEntry之后就返回
   return;
  }
  //如果当前的fileToZip不是一个文件夹，是一个文件，将其以字节码形式压缩到压缩包里面
  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 {
  //被解压的压缩文件
  String fileZip = "src/main/resources/unzipTest/compressed.zip";
  //解压的目标目录
  File destDir = new File("src/main/resources/unzipTest");

  byte[] buffer = new byte[1024];
  ZipInputStream zis = new ZipInputStream(new FileInputStream(fileZip));
  //获取压缩包中的entry，并将其解压
  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();
   //解压完成一个entry，再解压下一个
   zipEntry = zis.getNextEntry();
  }
  zis.closeEntry();
  zis.close();
 }
 //在解压目标文件夹，新建一个文件
 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("该解压项在目标文件夹之外: " + zipEntry.getName());
  }

  return destFile;
 }
}