Map/access array inside object on Pojo-CodePudding

How can I access and map an array inside an object on Pojo Spring Boot?

This is what I wanted to map

{
    "customers": [
        {
            "customerId": "0434556574",
            "paymentCode": "90501"
        }
    ]
}

CodePudding user response：

You would need to classes to match the JSON structure:

public class CustomersData {
    private List<Customer> customers;

    // Constructor, getter and setter
}

public class Customer {
    private String customerId;
    private String paymentCode;

    // Constructor, getter and setter
}

Important thing is to make sure your JSON properties name matches the attributes name in your Java classes (thus avoiding explicit mapping between them).

CodePudding user response：

Hi There are lot's of utility libraries you can convert JSON to required java class so that you can instantiate in right way. Example based on your input:

-----------------------------------com.example.Customer.java-----------------------------------

package com.example;

import java.util.HashMap;
import java.util.Map;
import javax.annotation.Generated;
import com.fasterxml.jackson.annotation.JsonAnyGetter;
import com.fasterxml.jackson.annotation.JsonAnySetter;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;

@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder({
"customerId",
"paymentCode"
})
@Generated("jsonschema2pojo")
public class Customer {

@JsonProperty("customerId")
private String customerId;
@JsonProperty("paymentCode")
private String paymentCode;
@JsonIgnore
private Map<String, Object> additionalProperties = new HashMap<String, Object>();

@JsonProperty("customerId")
public String getCustomerId() {
return customerId;
}

@JsonProperty("customerId")
public void setCustomerId(String customerId) {
this.customerId = customerId;
}

@JsonProperty("paymentCode")
public String getPaymentCode() {
return paymentCode;
}

@JsonProperty("paymentCode")
public void setPaymentCode(String paymentCode) {
this.paymentCode = paymentCode;
}

@JsonAnyGetter
public Map<String, Object> getAdditionalProperties() {
return this.additionalProperties;
}

@JsonAnySetter
public void setAdditionalProperty(String name, Object value) {
this.additionalProperties.put(name, value);
}

}
-----------------------------------com.example.Example.java-----------------------------------

package com.example;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.annotation.Generated;
import com.fasterxml.jackson.annotation.JsonAnyGetter;
import com.fasterxml.jackson.annotation.JsonAnySetter;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;

@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder({
"customers"
})
@Generated("jsonschema2pojo")
public class Example {

@JsonProperty("customers")
private List<Customer> customers = null;
@JsonIgnore
private Map<String, Object> additionalProperties = new HashMap<String, Object>();

@JsonProperty("customers")
public List<Customer> getCustomers() {
return customers;
}

@JsonProperty("customers")
public void setCustomers(List<Customer> customers) {
this.customers = customers;
}

@JsonAnyGetter
public Map<String, Object> getAdditionalProperties() {
return this.additionalProperties;
}

@JsonAnySetter
public void setAdditionalProperty(String name, Object value) {
this.additionalProperties.put(name, value);
}

}

Reference :jsontopojo