Jackson 反序列化Date时遇到的问题

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本文介绍了解决Jackson在反序列化特定日期格式时遇到的问题，并提供了一个自定义反序列化器的例子，用于处理yyyy-MM-dd HH:mm:ss格式的日期字符串。

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Jackson对于date的反序列化只支持几种，如果不符合默认格式则会报一下错误

org.codehaus.jackson.map.JsonMappingException: Can not construct instance of java.util.Date from String value '2012-12-12 12:01:01': not a valid representation (error: Can not parse date "2012-12-12 12:01:01": not compatible with any of standard forms ("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"))  
 at [Source: org.glassfish.jersey.message.internal.EntityInputStream@2c384e19; line: 1, column: 2] (through reference chain: jerseyspring.representation.Order["payTime"])  
    at org.codehaus.jackson.map.JsonMappingException.from(JsonMappingException.java:163)  
    at org.codehaus.jackson.map.deser.StdDeserializationContext.weirdStringException(StdDeserializationContext.java:243)  
    at org.codehaus.jackson.map.deser.std.StdDeserializer._parseDate(StdDeserializer.java:577)  
    at org.codehaus.jackson.map.deser.std.DateDeserializer.deserialize(DateDeserializer.java:28)  
    at org.codehaus.jackson.map.deser.std.DateDeserializer.deserialize(DateDeserializer.java:19)  
    at org.codehaus.jackson.map.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:299)  
    at org.codehaus.jackson.map.deser.SettableBeanProperty$MethodProperty.deserializeAndSet(SettableBeanProperty.java:414)  
    at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:697)  
    at org.codehaus.jackson.map.deser.BeanDeserializer.deserialize(BeanDeserializer.java:580)  
    at org.codehaus.jackson.map.ObjectMapper._readValue(ObjectMapper.java:2704)  
    at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1315)  
    at org.codehaus.jackson.jaxrs.JacksonJsonProvider.readFrom(JacksonJsonProvider.java:419)

解决方案：

public class CustomJsonDateDeserializer extends JsonDeserializer<Date> {  
  
    @Override  
    public Date deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {  
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  
                String date = jp.getText();  
                try {  
                    return format.parse(date);  
                } catch (ParseException e) {  
                    throw new RuntimeException(e);  
                }  
    }  
  
}

且在字段的setter上加上注解

    @JsonDeserialize(using = CustomJsonDateDeserializer.class)
    @JsonProperty("LAST_MODIFY_DATE")
    private Date lastModifyDate;