Annotation @JsonIgnoreProperties ของ Jackson ใช้ระบุ รายการคุณสมบัติ หรือ ฟิลด์ ของคลาสที่จะเพิกเฉย Annotation @JsonIgnoreProperties วางเหนือการประกาศคลาส แทนที่จะวางเหนือคุณสมบัติหรือฟิลด์แต่ละตัวที่ต้องการเพิกเฉย
ไวยากรณ์
@Target(value={ANNOTATION_TYPE,TYPE,METHOD,CONSTRUCTOR,FIELD})
@Retention(value=RUNTIME)
public @interface JsonIgnoreProperties
ตัวอย่างโค้ด
import java.io.*;
import com.fasterxml.jackson.annotation.*;
import com.fasterxml.jackson.databind.*;
public class JsonIgnorePropertiesTest {
public static void main(String[] args) throws IOException {
Customer customer = new Customer("120", "Ravi", "Hyderabad");
System.out.println(customer);
ObjectMapper mapper = new ObjectMapper();
String jsonString = mapper.writeValueAsString(customer);
System.out.println("JSON: " + jsonString);
System.out.println("---------");
jsonString = "{\"id\":\"130\",\"name\":\"Rahul\", \"address\":\"Mumbai\"}";
System.out.println("JSON: " + jsonString);
customer = mapper.readValue(jsonString, Customer.class);
System.out.println(customer);
}
}
// คลาส Customer
@JsonIgnoreProperties({"id", "address"})
class Customer {
private String id;
private String name;
private String address;
public Customer() {}
public Customer(String id, String name, String address) {
this.id = id;
this.name = name;
this.address = address;
}
public String getId() { return id; }
public String getName() { return name; }
public String getAddress() { return address; }
@Override
public String toString() {
return "Customer [id=" + id + ", name=" + name + ", address=" + address + "]";
}
}
ผลลัพธ์
Customer [id=120, name=Ravi, address=Hyderabad]
JSON: {"name":"Ravi"}
---------
JSON: {"id":"130","name":"Rahul", "address":"Mumbai"}
Customer [id=null, name=Rahul, address=null]