public static void importModels (MultipartFile file) throws IOException, InvalidFormatException {
     ZipInputStream zipInputStream = new ZipInputStream(file.getInputStream(), Charset.defaultCharset());
     BufferedInputStream bs = new BufferedInputStream(zipInputStream);
     Map<String, Map> stringMapMap;
     Map<String, String> modelJsons = new HashMap<>();
     ZipEntry zipEntry;
     String zipFileName;
     while ((zipEntry = zipInputStream.getNextEntry()) != null) {
         if (zipEntry.isDirectory()) {                // do nothing  

         } else if (zipEntry.getName().endsWith("json")) {
             String name = zipEntry.getName();

             long size = zipEntry.getSize();
             if (size == -1) {
                 ByteArrayOutputStream baos = new ByteArrayOutputStream();
                 while (true) {
                     int bytes = zipInputStream.read();
                     if (bytes == -1) {
                         break;
                     }
                     baos.write(bytes);
                 }
                 baos.close();
                 System.out.println(String.format("Name:%s,Content:%s", name, new String(baos.toByteArray())));
             } else { // ZipEntry的size正常     
                 byte[] bytes = new byte[(int) zipEntry.getSize()];
                 zipInputStream.read(bytes, 0, (int) zipEntry.getSize());
                 System.out.println(String.format("Name:%s,Content:%s", name, new String(bytes)));
             }
         } else if (zipEntry.getName().endsWith("xlxs")) {               //do other things      
         } else {
             return;
         }
     }
     return;
 }