java - Transforming from String to byte Array to file -

i received image data string in response transform byte[] , write pdf file not able open in pdf says either corrupt file or not decoded correctly. when open text, see same string data received in response. please see below , correct me.

string response = "aaaaaaaaa......aaaaa==";  /*byte[] imagebytearray = response.getbytes(); */  /*  decode string */ byte[] imagebytearray = base64.decodebase64(response);  fileoutputstream imageoutfile = new fileoutputstream("d:/output.pdf");  imageoutfile.write(imagebytearray, 0, imagebytearray.length);  imageinfile.close(); 

please find: enter link description here

writing pdf cannot done directly using java.io classes. need use apis itext write data pdf.

please check below url: http://itextpdf.com/