Jackson - Serialization Annotations
- Jackson - @JsonAnyGetter
- Jackson - @JsonGetter
- Jackson - @JsonPropertyOrder
- Jackson - @JsonRawValue
- Jackson - @JsonValue
- Jackson - @JsonRootName
- Jackson - @JsonSerialize
Jackson - Deserialization Annotations
- Jackson - @JsonCreator
- Jackson - @JacksonInject
- Jackson - @JsonAnySetter
- Jackson - @JsonSetter
- Jackson - @JsonDeserialize
- Jackson - @JsonEnumDefaultValue
Jackson - Property Inclusion Annotations
- Jackson - @JsonIgnoreProperties
- Jackson - @JsonIgnore
- Jackson - @JsonIgnoreType
- Jackson - @JsonInclude
- Jackson - @JsonAutoDetect
Jackson - Type Handling Annotations
Jackson - General Annotations
- Jackson - @JsonProperty
- Jackson - @JsonFormat
- Jackson - @JsonUnwrapped
- Jackson - @JsonView
- Jackson - @JsonManagedReference
- Jackson - @JsonBackReference
- Jackson - @JsonIdentityInfo
- Jackson - @JsonFilter
Jackson - Miscellaneous
Jackson - Resources
Jackson Annotations - @JsonUnwrapped
Overview
@JsonUnwrapped annotation is used to unwrap values of objects during serialization or de-serialization.
Example - Serialization without using @JsonUnwrapped
JacksonTester.java
package com.tutorialspoint;
import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import com.fasterxml.jackson.databind.ObjectMapper;
public class JacksonTester {
public static void main(String args[]) throws IOException, ParseException{
ObjectMapper mapper = new ObjectMapper();
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd-MM-yyyy");
Date date = simpleDateFormat.parse("20-12-1984");
Student.Name name = new Student.Name();
name.first = "Jane";
name.last = "Doe";
Student student = new Student(1, name);
String jsonString = mapper
.writerWithDefaultPrettyPrinter()
.writeValueAsString(student);
System.out.println(jsonString);
}
}
class Student {
public int id;
public Name name;
Student(int id, Name name){
this.id = id;
this.name = name;
}
static class Name {
public String first;
public String last;
}
}
Output
Run the JacksonTester and verify the output −
{
"id" : 1,
"name" : {
"first" : "Jane",
"last" : "Doe"
}
}
Example - Serialization with @JsonUnwrapped
JacksonTester.java
package com.tutorialspoint;
import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import com.fasterxml.jackson.annotation.JsonUnwrapped;
import com.fasterxml.jackson.databind.ObjectMapper;
public class JacksonTester {
public static void main(String args[]) throws IOException, ParseException{
ObjectMapper mapper = new ObjectMapper();
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd-MM-yyyy");
Date date = simpleDateFormat.parse("20-12-1984");
Student.Name name = new Student.Name();
name.first = "Jane";
name.last = "Doe";
Student student = new Student(1, name);
String jsonString = mapper
.writerWithDefaultPrettyPrinter()
.writeValueAsString(student);
System.out.println(jsonString);
}
}
class Student {
public int id;
@JsonUnwrapped
public Name name;
Student(int id, Name name){
this.id = id;
this.name = name;
}
static class Name {
public String first;
public String last;
}
}
Output
Run the JacksonTester and verify the output −
{
"id" : 1,
"first" : "Jane",
"last" : "Doe"
}
Here we can see, without using @JsonUnwrapped, Jackson is serializing the name object to a new JSON object whereas using @JsonUnwrapped annotation, we're able to unwrap name field and serialize them as other fields.
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