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Why Does URLEncoder Encode Spaces as ' ' Instead of ' '?

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Release: 2024-11-11 06:47:02
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Why Does URLEncoder Encode Spaces as ' ' Instead of ' '?

URLEncoder Conundrum: Understanding Space Character Encoding

When attempting to encode a string using URLEncoder, you might encounter an unexpected behavior where spaces are converted to ' ' symbols instead of the expected ' ' hexadecimal code.

Cause

The URLEncoder class adheres to the HTML Specifications for encoding URLs in HTML forms. According to these specifications, spaces should be replaced with ' ' symbols for parameters in application/x-www-form-urlencoded MIME format.

Solution

To achieve the desired encoding where spaces are converted to ' ', you can perform the following steps:

String encodedString = java.net.URLEncoder.encode("Hello World", "UTF-8");
encodedString = encodedString.replace("+", "%20");
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This will replace all ' ' symbols with ' ', resulting in the correct encoding according to your expectations.

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