springcloud採坑-jason序列化におけるDateオブジェクト

12674 ワード

要約:
1.出現するシーン。
2.エラー内容とコード追跡。
3.原因
4.3つの解決策。
1. 出現するシーン：

サービス側はspringcloudインターフェースを提供します。

クライアントは、feignを介してインターフェースを呼び出し、リターン値は、リストのCompanyDTであり、DTXにはDateオブジェクトがある。

呼び出しエラー

2. エラーは以下の通りです

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 more
Caused 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

はAbstractJackson 2 HttpMessage Coverter.java:225のreadJava Type方法から始まります。

DateDeserializers.javaのdeserializeには、コアロジックがあります。customFormat.parse。問題が来ましたcustomFormatはどこから来ましたか？

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);//  
                        } catch (ParseException var8) {
                            return (Date)ctxt.handleWeirdStringValue(this.handledType(), str, "expected format \"%s\"", new Object[]{this._formatString});
                        }

                        return var10000;
                    }
                }
            }

            return super._parseDate(p, ctxt);
        }

DateBasedDeserializerの中の_customFormatは、ctxt.get Config（）で取得し、Deserialization Contectは設定の文脈です。

protected abstract static class DateBasedDeserializer extends 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();//  
                        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;
        }
    }

私達はget DateFormatの具体的な実現を見て、最後にMapperConfigの中のBaseSeSettingsを通じて獲得します。

    public final DateFormat getDateFormat() {
        return this._base.getDateFormat();
    }

3.具体的な理由はJasonがいくつかのフォーマットをサポートしているだけです。

"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.解決策：
デフォルトのプログレッシブがこのようなフォーマットをサポートしていないなら、手動で設定してください。
4.1クライアントのDateFormatを設定します。

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;
    }

    //           
    @Override
    public Date parse(String source) throws ParseException {

        Date date = null;

        try {

            //        
            date = format1.parse(source);
        } catch (Exception e) {

            //   ，         
            date = dateFormat.parse(source);
        }

        return date;
    }

    //     clone        clone   jackson     
    @Override
    public Object clone() {
        Object format = dateFormat.clone();
        return new MyDateFormat((DateFormat) format);
    }
}

そして起動時に加入します。

@Configuration
public class WebConfig {

	@Autowired
	private Jackson2ObjectMapperBuilder jackson2ObjectMapperBuilder;
	
	@Bean
	public MappingJackson2HttpMessageConverter MappingJsonpHttpMessageConverter() {

		ObjectMapper mapper = jackson2ObjectMapperBuilder.build();

		// ObjectMapper         ，                
		//      setDateFormat                  
		DateFormat dateFormat = mapper.getDateFormat();
		mapper.setDateFormat(new MyDateFormat(dateFormat));

		MappingJackson2HttpMessageConverter mappingJsonpHttpMessageConverter = new MappingJackson2HttpMessageConverter(
				mapper);
		return mappingJsonpHttpMessageConverter;
	}
}

4.2ソリューション2
コードで構成できます。

#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解決策3
フィールドのsetterに注釈を加えるのは、この方法が面倒くさいです。

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;
    }

}

DTMのフィールドに注釈を追加します。

    @JsonDeserialize(using = DateJsonDeserializer.class)
    private Date applyRefundTime;

参考記事:
https://blog.csdn.net/qq906627950/article/details/79503801
http://wujiu.iteye.com/blog/2244537

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