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

What are the notes of Json? in view of this problem, this article introduces the corresponding analysis and solution in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible way.

1.@JsonIgnoreProperties

Note which properties on the class do not have to participate in serialization and deserialization

@ Data@JsonIgnoreProperties (value = {"word"}) public class Person {private String hello; private String word;}

2.@JsonIgnore

Ignore on attribute

@ Datapublic class Person {private String hello; @ JsonIgnore private String word;}

3.@JsonFormat

Format serialized string

@ Datapublic class Person {@ JsonFormat (shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd HH:mm", timezone = "GMT+8") private Date time; private String hello; private String word;}

4.@JsonSerialize

When serializing, you can add it to the get method or directly to the property by overriding it.

@ Datapublic class Person {private String hello; private String word; @ JsonSerialize (using = CustomDoubleSerialize.class) private Double money;} public class CustomDoubleSerialize extends JsonSerializer {private DecimalFormat df = new DecimalFormat ("#"); @ Override public void serialize (Double value, JsonGenerator jgen, SerializerProvider provider) throws IOException, JsonProcessingException {jgen.writeString (df.format (value));}}

5.@JsonDeserialize

When deserialization, you can add it to the set method or directly to the attribute by overriding it.

Datapublic class Person {private String hello; private String word; @ JsonDeserialize (using = CustomDateDeserialize.class) private Date time;} public class CustomDateDeserialize extends JsonDeserializer {private SimpleDateFormat sdf = new SimpleDateFormat ("yyyy-MM-dd"); @ Override public Date deserialize (JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {Date date = null; try {date = sdf.parse (jp.getText ()) } catch (ParseException e) {e.printStackTrace ();} return date;}}

5.@JsonInclude

Include.Include.ALWAYS default

The Include.NON_DEFAULT property is not serialized by default

The Include.NON_EMPTY attribute is empty ("") or NULL is not serialized (if you want to pass data from the front end, you will not serialize when list is empty).

The Include.NON_NULL property is NULL and is not serialized

@ Datapublic class OrderProcessTime {@ JsonInclude (JsonInclude.Include.ALWAYS) private Date plan;}

6.@JsonProperty

Used to represent names used in Json serialization and deserialization, such as variable naming that does not conform to programming specifications

@ Datapublic class Person {private String hello; private String word; private Date time; @ JsonProperty (value = "DeliveryTime") private Integer deliveryTime;}

7.Java serialization excludes specified fields

Use the variable modifier transient

Here the print password value is empty.

Use the keyword static

The second kind is easy to misunderstand. Content still has data when it is exported.

The value of the deserialization input is "just the previous value". Although the printed value after that also sees "just the previous value", this is not the value of the serialized one.

If you don't understand, you can set the value of content again.

MsgInfo.setContent ("this is modified")

After deserializing the print process, you will see that the output value is the value just set, "this is modified."

The answers to the questions about the Json notes are shared here. I hope the above content can be of some help to you. If you still have a lot of doubts to be solved, you can follow the industry information channel for more related knowledge.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.