使用可能回傳不同資料的JSON

我想使用 spring boot 撰寫一些 java 代碼來使用來自特定端點的 JSON 資料。但是，對于每個請求，回應可能會回傳不同的資料欄位。

{"success":true,"terms":"https:\/\/coinlayer.com\/terms","privacy":"https:\/\/coinlayer.com\/privacy","timestamp":1645616586,"target":"USD","rates":{"BTC":39049.424242}}

{"success":true,"terms":"https:\/\/coinlayer.com\/terms","privacy":"https:\/\/coinlayer.com\/privacy","timestamp":1645626666,"target":"USD","rates":{"BTC":39061.184046,"ETH":2726.545731}}

{"success":true,"terms":"https:\/\/coinlayer.com\/terms","privacy":"https:\/\/coinlayer.com\/privacy","timestamp":1645626966,"target":"USD","rates":{"ADA":0.939301,"BTC":39006.990707,"ETH":2720.502765}}

等等。

下面是我當前處理第一個案例的代碼。我可以撰寫另一個 Rates.java 來滿足第二種情況，依此類推，但我希望有一個 Rates.java 檔案來處理所有可能的情況。

LiveData.java

package com.example.consumingrest;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

@JsonIgnoreProperties(ignoreUnknown = true)
public class LiveData {

    private Boolean success;
    private String terms;
    private String privacy;
    private Long timestamp;
    private String target;
    private Rates rates;

    public LiveData() {
    }

    public Boolean getSuccess() {
        return success;
    }

    public void setSuccess(Boolean success) {
        this.success = success;
    }

    public String getTerms() {
        return terms;
    }

    public void setTerms(String terms) {
        this.terms = terms;
    }

    public String getPrivacy() {
        return privacy;
    }

    public void setPrivacy(String privacy) {
        this.privacy = privacy;
    }

    public Long getTimestamp() {
        return timestamp;
    }

    public void setTimestamp(Long timestamp) {
        this.timestamp = timestamp;
    }

    public String getTarget() {
        return target;
    }

    public void setTarget(String target) {
        this.target = target;
    }

    public Rates getRates() {
        return rates;
    }

    public void setValue(Rates rates) {
        this.rates = rates;
    }

    @Override
    public String toString() {
        return "LiveData{"  
                "success='"   success   '\''  
                "terms='"   terms   '\''  
                "privacy='"   privacy   '\''  
                "timestamp='"   timestamp   '\''  
                "target='"   target   '\''  
                "rates="   rates  
                '}';
    }
}

Rates.java

package com.example.consumingrest;
import java.math.BigDecimal;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonProperty;

@JsonIgnoreProperties(ignoreUnknown = true)
public class Rates {
    @JsonProperty(value = "BTC")
    private BigDecimal btc;

    public Rates() {
    }

    public BigDecimal getBTC() {
        return this.btc;
    }

    public void setId(BigDecimal btc) {
        this.btc = btc;
    }


    @Override
    public String toString() {
        return "{"  
                "BTC='"   btc   '\'' 
                '}';
    }
}

ConsumingRest.java（主要）

package com.example.consumingrest;

import java.time.LocalDate;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.client.RestTemplateBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
public class ConsumingRestApplication {

    private static final Logger log = LoggerFactory.getLogger(ConsumingRestApplication.class);

    public static void main(String[] args) {
        SpringApplication.run(ConsumingRestApplication.class, args);
    }

    @Bean
    public RestTemplate restTemplate(RestTemplateBuilder builder) {
        return builder.build();
    }

    @Bean
    public CommandLineRunner run(RestTemplate restTemplate) throws Exception {
        return args -> {
            LiveData liveData = restTemplate.getForObject(
                    "http://api.coinlayer.com/api/live?access_key=121a4df8b95fd5be872da3bad101cd73&target=EUR&symbols=BTC", LiveData.class);
            log.info(liveData.toString());
        };
    }
}

uj5u.com熱心網友回復：

如評論中所述，您似乎想要一張包含費率的地圖：

@JsonIgnoreProperties(ignoreUnknown = true)
public class LiveData {
    ...
    private Map<String, BigDecimal> rates;

請參閱映射動態 JSON 物件

uj5u.com熱心網友回復：

任何 Json Object 都可以決議為Map<String, Object>Object 可以是任何東西，包括Mapor List。因此，您的地圖可以嵌套任何深度，并且它可以包含帶有任何物件的串列，包括地圖。您的任何回應都可以始終決議為該結構。因此，回傳該結構，您就不必擔心不同的格式 - 這是一種適合所有人的尺寸。

標籤：爪哇 json 弹簧靴

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