byte[] 和 InputStream 相互转化

1. byte[] -> InputStream

      byte[] b = xxx;

      InputStream is = new ByteArrayInputStream(b);

 

2. InputStream -> byte[]

   InputStream is = xxx;
   ByteArrayOutputStream bytestream = new ByteArrayOutputStream();
   int ch;
   while ((ch = is.read()) != -1) {
    bytestream.write(ch);
   }
   byte[] b = bytestream.toByteArray();
   bytestream.close();