本文共 11670 字，大约阅读时间需要 38 分钟。
提纲：
1.出现的场景。
2.报错内容和代码追踪。
3.原因。
4.三种解决方案。
1. 出现的场景：
2. 报错如下：
Caused by: org.springframework.http.converter.HttpMessageNotReadableException: Could not read document: Can not deserialize value of type java.util.Date from String "2017-12-08 09:20:53": not a valid representation (error: Failed to parse Date value '2017-12-08 09:20:53': Can not parse date "2017-12-08 09:20:53Z": while it seems to fit format 'yyyy-MM-dd'T'HH:mm:ss.SSS'Z'', parsing fails (leniency? null)) at [Source: java.io.PushbackInputStream@2041c1b0; line: 1, column: 554] (through reference chain: com.qts.base.result.ResponseData["data"]->java.util.ArrayList[0]->com.qts.company.api.dto.CompanyDTO["applyRefundTime"]); nested exception is com.fasterxml.jackson.databind.exc.InvalidFormatException: Can not deserialize value of type java.util.Date from String "2017-12-08 09:20:53": not a valid representation (error: Failed to parse Date value '2017-12-08 09:20:53': Can not parse date "2017-12-08 09:20:53Z": while it seems to fit format 'yyyy-MM-dd'T'HH:mm:ss.SSS'Z'', parsing fails (leniency? null)) at [Source: java.io.PushbackInputStream@2041c1b0; line: 1, column: 554] (through reference chain: com.qts.base.result.ResponseData["data"]->java.util.ArrayList[0]->com.qts.company.api.dto.CompanyDTO["applyRefundTime"]) at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:228) at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.read(AbstractJackson2HttpMessageConverter.java:213) at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:95) at org.springframework.cloud.netflix.feign.support.SpringDecoder.decode(SpringDecoder.java:59) at org.springframework.cloud.netflix.feign.support.ResponseEntityDecoder.decode(ResponseEntityDecoder.java:47) at feign.SynchronousMethodHandler.decode(SynchronousMethodHandler.java:165) ... 75 moreCaused by: com.fasterxml.jackson.databind.exc.InvalidFormatException: Can not deserialize value of type java.util.Date from String "2017-12-08 09:20:53": not a valid representation (error: Failed to parse Date value '2017-12-08 09:20:53': Can not parse date "2017-12-08 09:20:53Z": while it seems to fit format 'yyyy-MM-dd'T'HH:mm:ss.SSS'Z'', parsing fails (leniency? null)) at [Source: java.io.PushbackInputStream@2041c1b0; line: 1, column: 554] (through reference chain: com.qts.base.result.ResponseData["data"]->java.util.ArrayList[0]->com.qts.company.api.dto.CompanyDTO["applyRefundTime"]) at com.fasterxml.jackson.databind.exc.InvalidFormatException.from(InvalidFormatException.java:74) at com.fasterxml.jackson.databind.DeserializationContext.weirdStringException(DeserializationContext.java:1410) at com.fasterxml.jackson.databind.DeserializationContext.handleWeirdStringValue(DeserializationContext.java:926) at com.fasterxml.jackson.databind.deser.std.StdDeserializer._parseDate(StdDeserializer.java:822) at com.fasterxml.jackson.databind.deser.std.StdDeserializer._parseDate(StdDeserializer.java:791) at com.fasterxml.jackson.databind.deser.std.DateDeserializers$DateBasedDeserializer._parseDate(DateDeserializers.java:172) at com.fasterxml.jackson.databind.deser.std.DateDeserializers$DateDeserializer.deserialize(DateDeserializers.java:259) at com.fasterxml.jackson.databind.deser.std.DateDeserializers$DateDeserializer.deserialize(DateDeserializers.java:242) at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:499) at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:101) at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:357) at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:148) at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:277) at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:249) at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:26) at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:499) at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:101) at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:357) at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:148) at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3789) at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2913) at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:225) ... 80 more
protected Date _parseDate(JsonParser p, DeserializationContext ctxt) throws IOException { if (this._customFormat != null) { JsonToken t = p.getCurrentToken(); if (t == JsonToken.VALUE_STRING) { String str = p.getText().trim(); if (str.length() == 0) { return (Date)this.getEmptyValue(ctxt); } DateFormat var5 = this._customFormat; synchronized(this._customFormat) { Date var10000; try { var10000 = this._customFormat.parse(str);//重点 } catch (ParseException var8) { return (Date)ctxt.handleWeirdStringValue(this.handledType(), str, "expected format \"%s\"", new Object[]{this._formatString}); } return var10000; } } } return super._parseDate(p, ctxt); } protected abstract static class DateBasedDeserializerextends StdScalarDeserializer implements ContextualDeserializer { protected final DateFormat _customFormat; protected final String _formatString; protected abstract DateDeserializers.DateBasedDeserializer withDateFormat(DateFormat var1, String var2); public JsonDeserializer createContextual(DeserializationContext ctxt, BeanProperty property) throws JsonMappingException { if (property != null) { Value format = this.findFormatOverrides(ctxt, property, this.handledType()); if (format != null) { TimeZone tz = format.getTimeZone(); Locale loc; if (format.hasPattern()) { String pattern = format.getPattern(); loc = format.hasLocale() ? format.getLocale() : ctxt.getLocale(); SimpleDateFormat df = new SimpleDateFormat(pattern, loc); if (tz == null) { tz = ctxt.getTimeZone(); } df.setTimeZone(tz); return this.withDateFormat(df, pattern); } if (tz != null) { DateFormat df = ctxt.getConfig().getDateFormat();//重点 Object df; if (df.getClass() == StdDateFormat.class) { loc = format.hasLocale() ? format.getLocale() : ctxt.getLocale(); StdDateFormat std = (StdDateFormat)df; std = std.withTimeZone(tz); std = std.withLocale(loc); df = std; } else { df = (DateFormat)df.clone(); ((DateFormat)df).setTimeZone(tz); } return this.withDateFormat((DateFormat)df, this._formatString); } } } return this; } }
public final DateFormat getDateFormat() { return this._base.getDateFormat(); } 3.具体原因是Jason只支持一下几种格式：
"yyyy-MM-dd'T'HH:mm:ss.SSSZ" "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'" "EEE, dd MMM yyyy HH:mm:ss zzz" "yyyy-MM-dd"
4.解决方案：
既然默认的序列化不支持这样的格式，那就手动设置一下。
4.1设置客户端的DateFormat。
public class MyDateFormat extends DateFormat { private DateFormat dateFormat; private SimpleDateFormat format1 = new SimpleDateFormat("yyy-MM-dd HH:mm:ss"); public MyDateFormat(DateFormat dateFormat) { this.dateFormat = dateFormat; } @Override public StringBuffer format(Date date, StringBuffer toAppendTo, FieldPosition fieldPosition) { return dateFormat.format(date, toAppendTo, fieldPosition); } @Override public Date parse(String source, ParsePosition pos) { Date date = null; try { date = format1.parse(source, pos); } catch (Exception e) { date = dateFormat.parse(source, pos); } return date; } // 主要还是装饰这个方法 @Override public Date parse(String source) throws ParseException { Date date = null; try { // 先按我的规则来 date = format1.parse(source); } catch (Exception e) { // 不行，那就按原先的规则吧 date = dateFormat.parse(source); } return date; } // 这里装饰clone方法的原因是因为clone方法在jackson中也有用到 @Override public Object clone() { Object format = dateFormat.clone(); return new MyDateFormat((DateFormat) format); }} 并在启动的时候加入。
@Configurationpublic class WebConfig { @Autowired private Jackson2ObjectMapperBuilder jackson2ObjectMapperBuilder; @Bean public MappingJackson2HttpMessageConverter MappingJsonpHttpMessageConverter() { ObjectMapper mapper = jackson2ObjectMapperBuilder.build(); // ObjectMapper为了保障线程安全性，里面的配置类都是一个不可变的对象 // 所以这里的setDateFormat的内部原理其实是创建了一个新的配置类 DateFormat dateFormat = mapper.getDateFormat(); mapper.setDateFormat(new MyDateFormat(dateFormat)); MappingJackson2HttpMessageConverter mappingJsonpHttpMessageConverter = new MappingJackson2HttpMessageConverter( mapper); return mappingJsonpHttpMessageConverter; }}4.2解决方案2 可以通过代码，那就可以通过配置。。。
#spring.mvc.date-format=yyyy-MM-dd HH:mm:ss#spring.jackson.time-zone=GMT+8#spring.jackson.date-format=yyyy-MM-dd HH:mm:ss#spring.jackson.deserialization.accept_empty_string_as_null_object=true
4.3解决方案3
在字段的setter上加上注解，这种方法比较麻烦。
public class DateJsonDeserializer extends JsonDeserializer{ /** * @see JsonDeserializer#deserialize(JsonParser, * DeserializationContext) */ @Override public Date deserialize(JsonParser parser, DeserializationContext context) throws IOException, JsonProcessingException { try { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); return sdf.parse(parser.getValueAsString()); } catch (Exception e) { e.printStackTrace(); } return null; }}
然后在DTO的字段上增加注解：
@JsonDeserialize(using = DateJsonDeserializer.class) private Date applyRefundTime;
参考文章：
https://blog.csdn.net/qq906627950/article/details/79503801
http://wujiu.iteye.com/blog/2244537