Below
statement include only non null values in json serialization.
@JsonInclude(JsonInclude.Include.NON_NULL)
Example
@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder({
"firstName", "lastName", "hobbies",
"id" })
public
class Employee {
}
Find the below
working application.
Employee.java
package com.sample.model; import java.util.ArrayList; import java.util.List; import com.fasterxml.jackson.annotation.JsonInclude; import com.fasterxml.jackson.annotation.JsonPropertyOrder; @JsonInclude(JsonInclude.Include.NON_NULL) @JsonPropertyOrder({ "firstName", "lastName", "hobbies", "id" }) public class Employee { private int id; private String firstName; private String lastName; private List<String> hobbies = new ArrayList<>(); public int getId() { return id; } public void setId(int id) { this.id = id; } public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } public List<String> getHobbies() { return hobbies; } public void setHobbies(List<String> hobbies) { this.hobbies = hobbies; } @Override public String toString() { StringBuilder builder = new StringBuilder(); builder.append("Employee [id=").append(id).append(", firstName=").append(firstName).append(", lastName=") .append(lastName).append(", hobbies=").append(hobbies).append("]"); return builder.toString(); } }
App.java
package com.sample.app; import java.io.IOException; import com.fasterxml.jackson.core.JsonGenerationException; import com.fasterxml.jackson.databind.JsonMappingException; import com.fasterxml.jackson.databind.ObjectMapper; import com.sample.model.Employee; public class App { public static void main(String args[]) throws JsonGenerationException, JsonMappingException, IOException { Employee emp = new Employee(); emp.setFirstName("Hari Krishna"); emp.setId(1); emp.getHobbies().add("Trekking"); emp.getHobbies().add("Blogging"); emp.getHobbies().add("Cooking"); ObjectMapper mapper = new ObjectMapper(); mapper.writeValue(System.out, emp); } }
Output
{"firstName":"Hari
Krishna","hobbies":["Trekking","Blogging","Cooking"],"id":1}
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