解压zip文件及文件与bytes间转换

 

/**
  * 解压缩zip文件
  * @return
  */
 public static List upZip(File zipfile) {
  List zip_files = new ArrayList();
  if (zipfile.exists()) {
   try {
    ZipFile zipFile = new ZipFile(zipfile);
    Enumeration enu = zipFile.getEntries();
    while (enu.hasMoreElements()) {
     ZipEntry entry =  (ZipEntry) enu.nextElement();
     String filename = entry.getName();
     InputStream is =  zipFile.getInputStream(entry);
     File file = new File(filename);
     FileOutputStream fos = new FileOutputStream(file);
     int bytesRead = 0;
     byte[] buffer = new byte[8192];
     while((bytesRead=is.read(buffer,0,8192))!=-1){
      fos.write(buffer, 0, bytesRead);
     }
     fos.close();
     is.close();
     zip_files.add(file);
    }
   } catch (Exception e) {
    e.printStackTrace();
    System.out.println("解压文件失败！");
   }
  }
  return zip_files;
 }
 
 /**
  * 将文件转换成bytes
  * @param f
  * @return
  * @throws Exception
  */
 public static byte[] getBytesFromFile(File f) throws Exception {
  FileInputStream stream = new FileInputStream(f);
  ByteArrayOutputStream out = new ByteArrayOutputStream(1000);
  byte[] b = new byte[2048];
  int n = 0;
  while ((n = stream.read()) != -1) {
   out.write(b, 0, n);
  }
  stream.close();
  out.close();
  return out.toByteArray();
 }

 /**
  * 将字节数组写入文件
  *
  * @param bytes
  * @return
  */
 private File getFileFromByte(byte[] bytes, String fileName)
   throws Exception {
  InputStream is = new ByteArrayInputStream(bytes);
  File file = new File(fileName);
  FileOutputStream fos = new FileOutputStream(file);
  int bytesRead = 0;
  byte[] buffer = new byte[8192];
  while ((bytesRead = is.read(buffer, 0, 8192)) != -1) {
   fos.write(buffer, 0, bytesRead);
  }
  fos.close();
  is.close();
  return file;
 }