Client download of a server generated zip file

Question

Before somebody says, \"duplicate\", I just want to make sure, that folks know, that I have already reviewed these questions:

1) Uses angular and php, not sure what

Answer 1

As indicated in this answer, I have used the below Javascript function and now I am able to download the byte[] array content successfully.

Function to convert byte array stream (type of string) to blob object:

var b64toBlob = function(b64Data, contentType, sliceSize) {
      contentType = contentType || '';
      sliceSize = sliceSize || 512;

      var byteCharacters = atob(b64Data);
      var byteArrays = [];

      for (var offset = 0; offset < byteCharacters.length; offset += sliceSize) {
        var slice = byteCharacters.slice(offset, offset + sliceSize);

        var byteNumbers = new Array(slice.length);
        for (var i = 0; i < slice.length; i++) {
          byteNumbers[i] = slice.charCodeAt(i);
        }

        var byteArray = new Uint8Array(byteNumbers);

        byteArrays.push(byteArray);
      }

      var blob = new Blob(byteArrays, {type: contentType});
      return blob;
};

An this is how I call this function and save the blob object with FileSaver.js (getting data via Angular.js $http.get):

    $http.get("your/api/uri").success(function(data, status, headers, config) {
        //Here, data is type of string
        var blob = b64toBlob(data, 'application/zip');
        var fileName = "download.zip";
        saveAs(blob, fileName);
    });

Note: I am sending the byte[] array (Java-Server-Side) like this:

byte[] myByteArray = /*generate your zip file and convert into byte array*/ new byte[]();
return new ResponseEntity(myByteArray , headers, HttpStatus.OK);