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How to serialize and deserialize a JSON using the ExclusionStrategy interface in Java?
The ExclusionStrategy interface can be used to exclude any field during serialization and deserialization. We can provide a custom implementation of the ExclusionStrategy interface and need to register it with GsonBuilder using the setExclusionStrategies() method. It configures Gson to apply a set of exclusion strategies during serialization and deserialization.
Syntax
public GsonBuilder setExclusionStrategies(ExclusionStrategy... strategies)
Example
import com.google.gson.*;
import com.google.gson.ExclusionStrategy;
import com.google.gson.FieldAttributes;
public class ExclusionStrategyTest {
public static void main(String args[]) throws Exception {
Gson gson = new GsonBuilder().setExclusionStrategies(new CustomExclusionStrategy()).create();
Person person = new Person();
person.setFirstName("Adithya");
person.setLastName("Sai");
person.setAddress("Hyderabad");
String jsonString = gson.toJson(person);
System.out.println("Serialize a JSON: \n "+jsonString);
String inputJson = "{\"firstName\":\"Raja\", \"lastName\":\"Ramesh\", \"address\":\"Hyderabad\"}";
person = gson.fromJson(inputJson, Person.class);
System.out.println("Deserialize a JSON:\n"+ person);
}
}
// CustomExclusionStrategy class
class CustomExclusionStrategy implements ExclusionStrategy {
public boolean shouldSkipField(FieldAttributes f) {
if(f.getName().equals("firstName")) {
return true;
}
return false;
}
public boolean shouldSkipClass(Class aClass) {
return false;
}
}
// Person class
class Person {
private String firstName, lastName, address;
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String geLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String toString() {
return "Person [" + firstName + " " + lastName + " " + address + "]";
}
}Output
Serialize a JSON:
{"lastName":"Sai","address":"Hyderabad"}
Deserialize a JSON:
Person [null Ramesh Hyderabad]
Updated on: 08-Jul-2020
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