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GnanendraPonnala
GnanendraPonnala
Level 2
September 23, 2020
Solved

How to send generated PDF from javascript to Servlet.

  • September 23, 2020
  • 1 reply
  • 2862 views

Hello Team,

I have generated pdf based user inputs through javascript using pdfmake library, now i have to send email with generated pdf to customers. I am able send mail with pdf using smpt.js library but due to some security concerns its not recommended. Now I am thinking to send/post the generated pdf to backend (servlet class ) & send using acs commons email api.

 

Tried with below scenarious,

1. I tried sending pdf as Base64 from js & decode the same in servlet using java.util.Base64. getDecoder.decode(String)  - getting Illegal exception.

2. attaching pdf object to formData() object (as key- value) sending to servlet through ajax, still getting data as empty.

 

Can please helpn me is there any to achieve this.

 

Thanks in Advance

 

 

 

 

 

 

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Best answer by Manjunath_K

@gnanendraponnala 

Please try below code & it will not throw any error in java while decrypting the base64 encrypted file content.

 

Javascript

 

var file = $('#file-input')[0].files[0];
var reader = new FileReader();
var fileContent;    //data to be sent in ajax request with attr name 'fileContent'

 

reader.onload = function(readerEvt, test){
        fileContent = btoa(readerEvt.target.result);
}

reader.readAsBinaryString(file);

 

 

Java :

 

String decryptedFileContent = new String(Base64.decodeBase64(request.getParameter("fileContent")));

1 reply

Manjunath_K
Manjunath_KAccepted solution
Level 7
September 23, 2020

@gnanendraponnala 

Please try below code & it will not throw any error in java while decrypting the base64 encrypted file content.

 

Javascript

 

var file = $('#file-input')[0].files[0];
var reader = new FileReader();
var fileContent;    //data to be sent in ajax request with attr name 'fileContent'

 

reader.onload = function(readerEvt, test){
        fileContent = btoa(readerEvt.target.result);
}

reader.readAsBinaryString(file);

 

 

Java :

 

String decryptedFileContent = new String(Base64.decodeBase64(request.getParameter("fileContent")));

    GnanendraPonnala
    GnanendraPonnalaAuthor
    Level 2
    September 24, 2020

    Hi @manjunath_k

    correct me if I am wrong, I think above solution will work when we upload pdf file (any file) manually, but in my case pdf is getting generated dynamically based on user inputs on page. How can I send generated pdf to backend(java class), so that i can use it in email service api to send email with pdf.

     

    Code responsible to download pdf on client-side -- 

    pdfMake.createPdf(docDefinition).download();

     Instead of download, I want to send pdf to java, so that I can use it to send mail with pdf.

    let me if you need more info.

    Thanks

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