jackson解析json

ObjectMapper mapper = new ObjectMapper();
HttpPrintResponse response = mapper.readValue(json, HttpPrintResponse.class);

jackson 解析jsonarray

TypeReference<List<HttpPrintResponseItem>> type = new TypeReference<List<HttpPrintResponseItem>>() {};
List<HttpPrintResponseItem> list = mapper.readValue(json, type);

jackson 解析,因字段不存在产生测错误处理

错误信息

com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "result" (class com.jasper.HttpPrintResponse), not marked as ignorable (3 known properties: , "data", "returnCode", "info"])
 at [Source: java.io.StringReader@7f234f85; line: 1, column: 15] (through reference chain: com.jasper.HttpPrintResponse["result"])
	at com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException.from(UnrecognizedPropertyException.java:79)
	at com.fasterxml.jackson.databind.DeserializationContext.reportUnknownProperty(DeserializationContext.java:579)
	at com.fasterxml.jackson.databind.deser.std.StdDeserializer.handleUnknownProperty(StdDeserializer.java:672)
	at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownProperty(BeanDeserializerBase.java:906)
	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:328)
	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:121)
	at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2793)
	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:1943)
	at com.yianju.printer.PrinterClient.execute(PrinterClient.java:156)
	at com.yianju.printer.PrinterClient.access$0(PrinterClient.java:136)
	at com.yianju.printer.PrinterClient$1.run(PrinterClient.java:119)
	at java.util.TimerThread.mainLoop(Timer.java:555)
	at java.util.TimerThread.run(Timer.java:505)

解决办法

ObjectMapper mapper = new ObjectMapper();
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

jackson 时间处理的错误处理

异常信息

com.fasterxml.jackson.databind.exc.InvalidFormatException: Can not construct instance of java.util.Date from String value '2019-10-21 14:45:20': not a valid representation (error: Failed to parse Date value '2019-10-21 14:45:20': Can not parse date "2019-10-21 14:45:20": 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: java.io.StringReader@48957e9d; line: 1, column: 1890] (through reference chain: com.jasper.HttpPrintResponseItem["createTime"])
	at com.fasterxml.jackson.databind.exc.InvalidFormatException.from(InvalidFormatException.java:55)
	at com.fasterxml.jackson.databind.DeserializationContext.weirdStringException(DeserializationContext.java:650)
	at com.fasterxml.jackson.databind.deser.std.StdDeserializer._parseDate(StdDeserializer.java:577)
	at com.fasterxml.jackson.databind.deser.std.DateDeserializers$DateBasedDeserializer._parseDate(DateDeserializers.java:142)
	at com.fasterxml.jackson.databind.deser.std.DateDeserializers$DateDeserializer.deserialize(DateDeserializers.java:231)
	at com.fasterxml.jackson.databind.deser.std.DateDeserializers$DateDeserializer.deserialize(DateDeserializers.java:214)
	at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:375)
	at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:98)
	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:308)
	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:121)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:226)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:203)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:23)
	at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2793)
	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:1950)
	at com.yianju.printer.PrinterClient.execute(PrinterClient.java:163)
	at com.yianju.printer.PrinterClient.access$0(PrinterClient.java:136)
	at com.yianju.printer.PrinterClient$1.run(PrinterClient.java:119)
	at java.util.TimerThread.mainLoop(Timer.java:555)
	at java.util.TimerThread.run(Timer.java:505)

解决办法

DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  
ObjectMapper mapper = new ObjectMapper();
mapper.setDateFormat(fmt);