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What if there is a byte [] array in the VO object? When jason is converted, the byte [] exposed to the front end will be converted to String.

However, in the request sent by the front end, converting String to byte [] may throw an exception:

Com.fasterxml.jackson.core.JsonParseException: Failed to decode VALUE_STRING as base64 (MIME-NO-LINEFEEDS): Illegal character'"(code 0x22) in base64 content at [Source: java.io.PushbackInputStream@1d21ffcf; line: 4, column: 20]

At this point, you can customize the serialization and deserialization methods, as shown in the following code:

VO class: OrderVO

Import java.util.Date; import org.springframework.format.annotation.DateTimeFormat; import com.fasterxml.jackson.annotation.JsonFormat; import com.fasterxml.jackson.databind.annotation.JsonDeserialize; import com.fasterxml.jackson.databind.annotation.JsonSerialize; import io.swagger.annotations.ApiModel; import io.swagger.annotations.ApiModelProperty; import lombok.Data; / * * OrderVO. Order Model * / @ Data @ ApiModel ("order Model") public class OrderVO {/ * order ID * / @ ApiModelProperty ("order ID") private Long Id / * * order Code * / @ ApiModelProperty ("order Code") private String code; / * order name * / @ ApiModelProperty ("order name") private String name / * * order status * / @ ApiModelProperty ("order status") private Integer status; / * Commodity code * / @ ApiModelProperty (name = "Commodity Code") private String productCode / * creation time * / @ DateTimeFormat (pattern = "yyyy-MM-dd HH:mm:ss") @ JsonFormat (pattern = "yyyy-MM-dd HH:mm:ss") @ ApiModelProperty (name = "creation time", readOnly = true) private Date createdDate / * * user name * / @ ApiModelProperty ("user name") private String username; / * remark * / @ ApiModelProperty ("remark") private String remark / * * other, just a demo field * / @ ApiModelProperty ("other") @ JsonSerialize (using = MyByteSerialize.class) @ JsonDeserialize (using = MyByteDeSerializer.class) private byte [] other;}

Deserialization class: MyByteDeSerializer

Import java.io.IOException; import org.apache.commons.lang.StringUtils; import com.fasterxml.jackson.core.JsonParser; import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.databind.DeserializationContext; import com.fasterxml.jackson.databind.JsonDeserializer Public class MyByteDeSerializer extends JsonDeserializer {@ Override public byte [] deserialize (JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {String stringValue = p.getText (); if (StringUtils.isEmpty (stringValue)) {return null } return stringValue.getBytes ();}}

Serialization class: MyByteSerialize

Import java.io.IOException; import java.nio.charset.Charset; import com.fasterxml.jackson.core.JsonGenerator; import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.databind.JsonSerializer; import com.fasterxml.jackson.databind.SerializerProvider Public class MyByteSerialize extends JsonSerializer {@ Override public void serialize (byte [] value, JsonGenerator gen, SerializerProvider serializers) throws IOException, JsonProcessingException {if (null = = value | | 0 = = value.length) {gen.writeString ("") } gen.writeString (new String (value, Charset.defaultCharset ());}}

This allows you to handle json conversions of type byte [] in a way.

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