Shulou(Shulou.com)06/02 Report--

This article is to share with you about how to deal with JackJson, the editor thinks it is very practical, so I share it with you to learn. I hope you can get something after reading this article.

1. Physically

@ JsonInclude (Include.NON_NULL)

/ / place the tag on the attribute, and do not participate in serialization if the attribute is NULL

/ / if you put it on top of the class, it has an effect on all the properties of the class

/ / Include.Include.ALWAYS default

/ / Include.NON_DEFAULT attribute is default and not serialized

/ / the Include.NON_EMPTY attribute is empty ("") or NULL is not serialized.

/ / the Include.NON_NULL attribute is NULL and is not serialized

two。 On the code

ObjectMapper mapper = new ObjectMapper ()

Mapper.setSerializationInclusion (Include.NON_NULL)

/ / set the mapper object through this method, and all serialized objects will be serialized according to the modification rules.

/ / Include.Include.ALWAYS default

/ / Include.NON_DEFAULT attribute is default and not serialized

/ / the Include.NON_EMPTY attribute is empty ("") or NULL is not serialized.

/ / the Include.NON_NULL attribute is NULL and is not serialized

User user = new User (1, ", null)

String outJson = mapper.writeValueAsString (user)

System.out.println (outJson)

3.SerializationFeature.INDENT_OUTPUT: whether to zoom and arrange the output. The default is false. In some cases, the output needs to be scaled and arranged in order to facilitate typesetting and reading.

4. File to Json List example

Private static List parseFromJson (String jsonFileName) {File f = new File ("D:/rule/" + jsonFileName); InputStream inputStream = null; try {inputStream = new FileInputStream (f); JacksonCustomObjectMapper jacksonCustomObjectMapper = new JacksonCustomObjectMapper (); List jsonList = jacksonCustomObjectMapper.readValue (inputStream, new TypeReference () {}); return jsonList;} catch (UnsupportedEncodingException e) {return null;} catch (Exception e) {return null }} above is how to deal with JackJson, the editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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