Getting corrupted file while exporting .xls file using java/javascript and apache POI

Question

I am trying to downlaod a .xls file in browser from a web application. Below is the code for the same.

try(FileInputStream inputStream = new FileInputStream(\"C:         


        

Answer 1

Posting this solution if anyone else faces the same issue, I resolved this issue via base64 encoding the byte array to a string as below.

ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
 workbook.write(outputStream);
 String res = Base64.getEncoder().encodeToString(outputStream.toByteArray());

In javascript I decoded that string using base64ToBlob method from below link

https://stackoverflow.com/a/20151856/2011294

function base64toBlob(base64Data, contentType) {
    contentType = contentType || '';
    var sliceSize = 1024;
    var byteCharacters = atob(base64Data);
    var bytesLength = byteCharacters.length;
    var slicesCount = Math.ceil(bytesLength / sliceSize);
    var byteArrays = new Array(slicesCount);

    for (var sliceIndex = 0; sliceIndex < slicesCount; ++sliceIndex) {
        var begin = sliceIndex * sliceSize;
        var end = Math.min(begin + sliceSize, bytesLength);

        var bytes = new Array(end - begin);
        for (var offset = begin, i = 0; offset < end; ++i, ++offset) {
            bytes[i] = byteCharacters[offset].charCodeAt(0);
        }
        byteArrays[sliceIndex] = new Uint8Array(bytes);
    }
    return new Blob(byteArrays, { type: contentType });
}