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 - @JsonRootName
Overview
@JsonRootName annotation allows to have a root node specified over the JSON. We need to enable wrap root value as well.
Example - Serialization without using @JsonRootName
JacksonTester.java
package com.tutorialspoint;
import java.io.IOException;
import com.fasterxml.jackson.databind.ObjectMapper;
public class JacksonTester {
public static void main(String args[]){
ObjectMapper mapper = new ObjectMapper();
try {
Student student = new Student("Mark", 1);
String jsonString = mapper
.writerWithDefaultPrettyPrinter()
.writeValueAsString(student);
System.out.println(jsonString);
}
catch (IOException e) {
e.printStackTrace();
}
}
}
class Student {
private String name;
private int rollNo;
public Student(String name, int rollNo){
this.name = name;
this.rollNo = rollNo;
}
public String getName(){
return name;
}
public int getRollNo(){
return rollNo;
}
}
Output
Run the JacksonTester and verify the output −
{
"name" : "Mark",
"rollNo" : 1
}
Example - Serialization with @JsonRootName
JacksonTester.java
package com.tutorialspoint;
import java.io.IOException;
import com.fasterxml.jackson.annotation.JsonRootName;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
public class JacksonTester {
public static void main(String args[]){
ObjectMapper mapper = new ObjectMapper();
try {
Student student = new Student("Mark", 1);
mapper.enable(SerializationFeature.WRAP_ROOT_VALUE);
String jsonString = mapper
.writerWithDefaultPrettyPrinter()
.writeValueAsString(student);
System.out.println(jsonString);
}
catch (IOException e) {
e.printStackTrace();
}
}
}
@JsonRootName(value = "student")
class Student {
private String name;
private int rollNo;
public Student(String name, int rollNo){
this.name = name;
this.rollNo = rollNo;
}
public String getName(){
return name;
}
public int getRollNo(){
return rollNo;
}
}
Output
Run the JacksonTester and verify the output −
{
"student" : {
"name" : "Mark",
"rollNo" : 1
}
}
Here we've enabled root node by using ObjectMapper.enable(SerializationFeature.WRAP_ROOT_VALUE). By default, it prints the root name as class name as "Student". We've customized the root name using @JsonRootName annotation.
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