CODEWITHSUNDEEP
javapythonbase64
Prashant Singh
Prashant Singh

Reputation: 23

Base64 encoding string in Java doubles its length

Problem

I am trying to encode file contents of doc/pdf extensions to Base64 string in Java. The encoded string length almost doubles from the original(115k -> 230k). Whereas encoding the same file contents in Python/PHP or any online tool only gives a third increase(115k -> 154k).

What causes this increase in size for Java and is there any way to get equivalent result as the other sources?

Code

import java.util.Base64;
...

        //String content;
        System.out.println(content.length());
        String encodedStr = new String(Base64.getEncoder().encode(content.getBytes()));
        System.out.println(encodedStr.length());
        String urlEncodedStr = new String(Base64.getUrlEncoder().encode(content.getBytes()));
        System.out.println(urlEncodedStr.length());
        String mimieEncodedStr = new String(Base64.getMimeEncoder().encode(content.getBytes()));
        System.out.println(mimieEncodedStr.length());

Output

For pdf file

115747 230816 230816 236890

For doc file

13685 26392 26392 27086

Upvotes: 0

Views: 1099

Answers (1)

Elliott Frisch
Elliott Frisch

Reputation: 201447

First, never use new String. Second, pass an encoding to String.getBytes(String) (e.g. content.getBytes(encoding)). For example,

String encodedStr = Base64.getEncoder()
        .encodeToString(content.getBytes("UTF-8"));

or

String encodedStr = Base64.getEncoder()
        .encodeToString(content.getBytes("US-ASCII"));

Upvotes: 1

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