Trim string input in Converters where whitespace is irrelevant

Closes gh-28756

Author: sbrannen

spring-core/src/main/java/org/springframework/core/convert/support/StringToCharsetConverter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,17 +19,22 @@
 import java.nio.charset.Charset;
 
 import org.springframework.core.convert.converter.Converter;
+import org.springframework.util.StringUtils;
 
 /**
  * Convert a String to a {@link Charset}.
  *
  * @author Stephane Nicoll
+ * @author Sam Brannen
  * @since 4.2
  */
 class StringToCharsetConverter implements Converter<String, Charset> {
 
 	@Override
 	public Charset convert(String source) {
+		if (StringUtils.hasText(source)) {
+			source = source.trim();
+		}
 		return Charset.forName(source);
 	}
 

spring-core/src/main/java/org/springframework/core/convert/support/StringToCurrencyConverter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,17 +19,22 @@
 import java.util.Currency;
 
 import org.springframework.core.convert.converter.Converter;
+import org.springframework.util.StringUtils;
 
 /**
  * Convert a String to a {@link Currency}.
  *
  * @author Stephane Nicoll
+ * @author Sam Brannen
  * @since 4.2
  */
 class StringToCurrencyConverter implements Converter<String, Currency> {
 
 	@Override
 	public Currency convert(String source) {
+		if (StringUtils.hasText(source)) {
+			source = source.trim();
+		}
 		return Currency.getInstance(source);
 	}
 

spring-core/src/main/java/org/springframework/core/convert/support/StringToTimeZoneConverter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,12 +25,16 @@
  * Convert a String to a {@link TimeZone}.
  *
  * @author Stephane Nicoll
+ * @author Sam Brannen
  * @since 4.2
  */
 class StringToTimeZoneConverter implements Converter<String, TimeZone> {
 
 	@Override
 	public TimeZone convert(String source) {
+		if (StringUtils.hasText(source)) {
+			source = source.trim();
+		}
 		return StringUtils.parseTimeZoneString(source);
 	}