Why Does URLEncoder Replace Spaces with ' ' Instead of ' '?

Decoding Space Characters in URLEncoder

URLEncoder is a utility class used in Java for encoding strings in the application/x-www-form-urlencoded MIME format. This format is commonly used in HTML forms to encode data before submitting it to a server.

However, users may encounter issues while using URLEncoder to translate space characters. The expected output is " " for a space character, but URLEncoder by default replaces space with " " as per HTML specifications for URL encoding.

To overcome this behavior, users should consider replacing the " " character with " " explicitly in their code after applying URLEncoder.

System.out.println(java.net.URLEncoder.encode("Hello World", "UTF-8").replace("+", "%20"));

By modifying the encoded string in this manner, users can achieve the desired output:

Hello%20World

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