使用 Gson 反序列化未知 json

Question

我有一个免费的 api，用于使用 json 进行货币跟踪： api.coinmarketcap 我需要使用 Gson 库将这个 json 反序列化为我的复合 java 对象。这是我的模型对象：public class Quote {    @SerializedName("quotes")    private String mName;    @SerializedName("price")    private double mPrice;    public Quote(String name, double price) {        mName = name;        mPrice = price;    }    public String getName() {        return mName;    }    public double getPrice() {        return mPrice;    }}和：public class Currency {    private int mId;    private String mSymbol;    private byte mRank;    private String mWebsiteSlug;    private int mMaxSupply;    private Quote mQuote;    public Currency(int id, String symbol, byte rank, String websiteSlug, int maxSupply) {        mId = id;        mSymbol = symbol;        mRank = rank;        mWebsiteSlug = websiteSlug;        mMaxSupply = maxSupply;    }    public int getId() {        return mId;    }    public String getSymbol() {        return mSymbol;    }    public byte getRank() {        return mRank;    }    public String getWebsiteSlug() {        return mWebsiteSlug;    }    public int getMaxSupply() {        return mMaxSupply;    }    public Quote getQuote() {        return mQuote;    }}我不能用这种嵌套反序列化。

Answer 1

您可以在此处使用输入链接描述从 json 创建您的 pojo 类

Answer 2

我创建货币反序列化器：

public class CurrencyDeserializer implements JsonDeserializer<Currency> {

    @Override

    public Currency deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {

        Currency currency = new Currency();

        JsonObject currencyObject = json.getAsJsonObject();

        JsonElement id = currencyObject.get("id");

        if(!id.isJsonNull()) {

            currency.setId(id.getAsInt());

        }

        JsonElement name = currencyObject.get("name");

        if(!name.isJsonNull()) {

            currency.setName(name.getAsString());

        }

        JsonElement symbol = currencyObject.get("symbol");

        if(!symbol.isJsonNull()) {

            currency.setSymbol(symbol.getAsString());

        }

        JsonElement slug = currencyObject.get("website_slug");

        if(!slug.isJsonNull()) {

            currency.setWebsiteSlug(slug.getAsString());

        }

        JsonElement rank = currencyObject.get("rank");

        if(!rank.isJsonNull()) {

            currency.setRank(rank.getAsLong());

        }

        JsonElement circulatingSupply = currencyObject.get("circulating_supply");

        if(!circulatingSupply.isJsonNull()) {

            currency.setCirculatingSupply(circulatingSupply.getAsLong());

        }

        JsonElement totalSupply = currencyObject.get("total_supply");

        if(!totalSupply.isJsonNull()) {

            currency.setTotalSupply(totalSupply.getAsLong());

        }

        JsonElement maxSupply = currencyObject.get("max_supply");

        if(!maxSupply.isJsonNull()) {

            currency.setMaxSupply(maxSupply.getAsLong());

        }

        JsonElement lastUpdated = currencyObject.get("last_updated");

        if(!lastUpdated.isJsonNull()) {

            Long l = lastUpdated.getAsLong() * 1000;

            currency.setLastUpdated(new Date(l));

        }

        JsonObject quotes = currencyObject.get("quotes").getAsJsonObject();

        for(Map.Entry<String, JsonElement> rootObj : quotes.entrySet())

        {

            Quote quote = context.deserialize(rootObj.getValue(), Quote.class);

            quote.setName(rootObj.getKey());

            currency.addQuote(quote);

        }

        return currency;

    }

}

简单和工作