Java Fasterxml对象映射器：日期解析-意外字符（'；-'；（代码45））

Json:

{name:"abc",TxnDateUTC:2015-09-07T21:11:19Z}

ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
objectMapper.readValue( jsonString, Message.class );

Caused by: com.fasterxml.jackson.core.JsonParseException: Unexpected character ('-' (code 45)): was expecting comma to separate OBJECT entries
at [Source: java.io.StringReader@1aa7ecca; line: 1, column: 113]
at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1378)
at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:599)
at com.fasterxml.jackson.core.base.ParserMinimalBase._reportUnexpectedChar(ParserMinimalBase.java:520)
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser.nextToken(ReaderBasedJsonParser.java:599)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:301)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:121)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2796)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:1942)

Java代码：

{name:"abc",TxnDateUTC:2015-09-07T21:11:19Z}

ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
objectMapper.readValue( jsonString, Message.class );

Caused by: com.fasterxml.jackson.core.JsonParseException: Unexpected character ('-' (code 45)): was expecting comma to separate OBJECT entries
at [Source: java.io.StringReader@1aa7ecca; line: 1, column: 113]
at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1378)
at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:599)
at com.fasterxml.jackson.core.base.ParserMinimalBase._reportUnexpectedChar(ParserMinimalBase.java:520)
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser.nextToken(ReaderBasedJsonParser.java:599)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:301)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:121)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2796)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:1942)

例外情况：

{name:"abc",TxnDateUTC:2015-09-07T21:11:19Z}

ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
objectMapper.readValue( jsonString, Message.class );

Caused by: com.fasterxml.jackson.core.JsonParseException: Unexpected character ('-' (code 45)): was expecting comma to separate OBJECT entries
at [Source: java.io.StringReader@1aa7ecca; line: 1, column: 113]
at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1378)
at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:599)
at com.fasterxml.jackson.core.base.ParserMinimalBase._reportUnexpectedChar(ParserMinimalBase.java:520)
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser.nextToken(ReaderBasedJsonParser.java:599)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:301)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:121)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2796)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:1942)

我知道由于日期值是不带引号的，objectMapper会抛出异常，因为它不知道如何解析不带引号的值。但是由于我无法控制json格式，我如何解析这个json

---

当我在json字符串中引用日期值时，同样的代码也可以正常工作。

您可能应该阅读此代码，您的问题几乎与（阅读接受的答案）完全相同：

因此，简言之，allowunquetted的行为相当不稳定，在本例中，-字符确实会将其抛出。因此，您的json应该由以下内容变成：

{name:"abc",TxnDateUTC:2015-09-07T21:11:19Z}

为此：

{name:"abc",TxnDateUTC:"2015-09-07T21:11:19Z"}

更严格地说，应该是：

{"name":"abc","TxnDateUTC":"2015-09-07T21:11:19Z"}

编辑：此外，如果您希望我们帮助您，您应该在将来发布您的消息代码。由于您对json没有影响（这不是），因此可以编写自定义解析器

Editx2：因为我是个好人，我还为您实现了一个（相当容易出错）自定义解析器，尽管您对我的答案投了反对票。您只需这样注释消息类：

@JsonDeserialize(using = MessageDeserializer.class)
public class Message {

还有这样一个反序列化程序（我假设您可以将字符串转换为DateTime或您正在使用的任何日期，如果您不喜欢name和TXB标签都是字符串的事实，并在模式不匹配的情况下抛出一些异常，因此此处不包括此类代码）：

公共类MessageDeserializer扩展JsonDeserializer{
私有最终模式名称\u Pattern=Pattern.compile（“*？（\”？）名称（\”？）[\\s]*：[\\s]*（\“*”）.*？）；
私有最终模式日期\u Pattern=Pattern.compile（“*？TxnDateUTC:\”？（[A-Za-z0-9\\-：]{20}）。*？”；
@凌驾
公共消息反序列化（JsonParser jp，反序列化上下文dc）引发IOException，JsonProcessingException{
JsonLocation currentLocation=jp.getCurrentLocation（）；
字符串jsonString=（字符串）currentLocation.getSourceRef（）；
Matcher NAME Matcher=NAME\u PATTERN.Matcher（jsonString）；
字符串名称=”；
if（nameMatcher.matches（）&&nameMatcher.groupCount（）==3）{
name=nameMatcher.group（3）；
}
Matcher dateMatcher=DATE\u PATTERN.Matcher（jsonString）；
字符串日期=”；
if（dateMatcher.matches（）&&dateMatcher.groupCount（）==1）{
date=dateMatcher.group（1）；
}
返回新消息（名称、日期）；
}
}