我有一個(gè)免費(fèi)的 api，用于使用 json 進(jìn)行貨幣跟蹤： api.coinmarketcap 我需要使用 Gson 庫將這個(gè) json 反序列化為我的復(fù)合 java 對象。這是我的模型對象：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; }}我不能用這種嵌套反序列化。
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TA貢獻(xiàn)1789條經(jīng)驗(yàn) 獲得超10個(gè)贊
我創(chuàng)建貨幣反序列化器：
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;
}
}
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