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Refine StringUtils#uriDecode and update documentation

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Refine the StringUtils#uriDecode method in the following ways:
- Use a StringBuilder instead of ByteArrayOutputStream, and only decode
  %-encoded sequences.
- Use HexFormat.fromHexDigits to decode hex sequences.
- Decode to a byte array that is only allocated if encoded sequences are
  encountered.

This commit adds another optimization mainly for the use case where
there is no encoded sequence, and updates the Javadoc of both
StringUtils#uriDecode and UriUtils#decode to match the implementation.

Signed-off-by: Patrick Strawderman <pstrawderman@netflix.com>
Co-Authored-by: Sebastien Deleuze <sebastien.deleuze@broadcom.com>

Closes gh-35253
This commit is contained in:
Patrick Strawderman
2025-07-29 21:44:26 +02:00
committed by Brian Clozel
co-authored by Sebastien Deleuze
parent f3832c7262
commit 24e66b63d1
3 changed files with 52 additions and 36 deletions
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spring-web/src/main/java/org/springframework/web/util/UriUtils.java
+6 -5
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@@ -373,15 +373,16 @@ public abstract class UriUtils {
}
/**
* Decode the given encoded URI component.
* <p>See {@link StringUtils#uriDecode(String, Charset)} for the decoding rules.
* @param source the encoded String
* @param charset the character encoding to use
* Decode the given encoded URI component value by replacing "<i>{@code %xy}</i>" sequences
* by an hexadecimal representation of the character in the specified charset, letting other
* characters unchanged.
* @param source the encoded {@code String}
* @param charset the character encoding to use to decode the "<i>{@code %xy}</i>" sequences
* @return the decoded value
* @throws IllegalArgumentException when the given source contains invalid encoded sequences
* @since 5.0
* @see StringUtils#uriDecode(String, Charset)
* @see java.net.URLDecoder#decode(String, String)
* @see java.net.URLDecoder#decode(String, String) java.net.URLDecoder#decode for HTML form decoding
*/
public static String decode(String source, Charset charset) {
return StringUtils.uriDecode(source, charset);