spring InstantFormatter 源码
spring InstantFormatter 代码
文件路径：/spring-context/src/main/java/org/springframework/format/datetime/standard/InstantFormatter.java
/*
* Copyright 2002-2019 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.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.format.datetime.standard;
import java.text.ParseException;
import java.time.Instant;
import java.time.format.DateTimeFormatter;
import java.util.Locale;
import org.springframework.format.Formatter;
/**
* {@link Formatter} implementation for a JSR-310 {@link java.time.Instant},
* following JSR-310's parsing rules for an Instant (that is, not using a
* configurable {@link java.time.format.DateTimeFormatter}): accepting the
* default {@code ISO_INSTANT} format as well as {@code RFC_1123_DATE_TIME}
* (which is commonly used for HTTP date header values), as of Spring 4.3.
*
* @author Juergen Hoeller
* @author Andrei Nevedomskii
* @since 4.0
* @see java.time.Instant#parse
* @see java.time.format.DateTimeFormatter#ISO_INSTANT
* @see java.time.format.DateTimeFormatter#RFC_1123_DATE_TIME
*/
public class InstantFormatter implements Formatter<Instant> {
@Override
public Instant parse(String text, Locale locale) throws ParseException {
if (text.length() > 0 && Character.isAlphabetic(text.charAt(0))) {
// assuming RFC-1123 value a la "Tue, 3 Jun 2008 11:05:30 GMT"
return Instant.from(DateTimeFormatter.RFC_1123_DATE_TIME.parse(text));
}
else {
// assuming UTC instant a la "2007-12-03T10:15:30.00Z"
return Instant.parse(text);
}
}
@Override
public String print(Instant object, Locale locale) {
return object.toString();
}
}
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