數據模型映射與GSON返回null

我有這樣的JSON數據模型映射與GSON返回null

{ 
"Meta Data": { 
    "1: Symbol": "stock", 
    "2: Indicator": "SMA", 
    "3: Last Refreshed": "2017-07-25 09:50:00", 
    "4: Interval": "daily", 
    "5: Time Period": 3, 
    "6: Series Type": "open", 
    "7: Time Zone": "US/Eastern" 
}, 
"Technical Analysis: SMA": { 
    "2017-07-25 09:50:00": { 
     "SMA": "266.6264" 
    }, 
    "2017-07-24": { 
     "SMA": "265.9137" 
    }, 
    "2017-07-21": { 
     "SMA": "265.3237" 
    } 
}}

，我已經爲了映射這些類獲取模型GSON庫（股票，元數據，TechAnalysis，DayValue直接填充）：

public class Stock { 

private MetaData metaData; 
private TechAnalysis tech; 


public MetaData getMetaData() { 
    return metaData; 
} 
public void setMetaData(MetaData metaData) { 
    this.metaData = metaData; 
} 
public TechAnalysis getTech() { 
    return tech; 
} 
public void setTech(TechAnalysis tech) { 
    this.tech = tech; 
}} 




public class MetaData { 

private String symbol; 
private String indicator; 
private Date lastRefreshed; 
private String interval; 
private Integer period; 
private String zone; 



public String getSymbol() { 
    return symbol; 
} 
public void setSymbol(String symbol) { 
    this.symbol = symbol; 
} 
public String getIndicator() { 
    return indicator; 
} 
public void setIndicator(String indicator) { 
    this.indicator = indicator; 
} 
public Date getLastRefreshed() { 
    return lastRefreshed; 
} 
public void setLastRefreshed(Date lastRefreshed) { 
    this.lastRefreshed = lastRefreshed; 
} 
public String getInterval() { 
    return interval; 
} 
public void setInterval(String interval) { 
    this.interval = interval; 
} 
public Integer getPeriod() { 
    return period; 
} 
public void setPeriod(Integer period) { 
    this.period = period; 
} 
public String getZone() { 
    return zone; 
} 
public void setZone(String zone) { 
    this.zone = zone; 
}} 




public class TechAnalysis { 


private List<DayValue> dayValuesList; 

public List<DayValue> getDayValuesList() { 
    return dayValuesList; 
} 

public void setDayValuesList(List<DayValue> dayValuesList) { 
    this.dayValuesList = dayValuesList; 
}} 


public class DayValue { 

private String value; 

public String getValue() { 
    return value; 
} 
public void setValue(String value) { 
    this.value = value; 
}}

我的代碼，以地圖上的JSON響應的模式是這樣的：

public static Stock getStock(String json){ 

    Gson gson = new Gson(); 
    return gson.fromJson(json, Stock.class); 
}

但庫存對象返回始終爲空

來源

2017-07-25 Noomak

是你的參數'json'一個有效的stringify json'格式'？覈實。 – Beginner

類模型和JSON不兼容。例如，該JSON ...

"Meta Data": { 
    "1: Symbol": "stock", 
    "2: Indicator": "SMA", 
    "3: Last Refreshed": "2017-07-25 09:50:00", 
    "4: Interval": "daily", 
    "5: Time Period": 3, 
    "6: Series Type": "open", 
    "7: Time Zone": "US/Eastern" 
}

...意味着一類名爲Meta Data屬性（這不是一個有效的屬性名稱）和「元數據」類將需要1: Symbol，2: Indicator等命名的屬性（再次，無效的屬性名稱）。

你定義的類模型將與此JSON兼容：

{ 
    "metaData": { 
    "symbol": "stock", 
    "indicator": "SMA", 
    "lastRefreshed": "2017-07-25 09:50:00", 
    "interval": "daily", 
    "period": 3, 
    "zone": "US/Eastern" 
    }, 
    "techAnalysis": { 
    "dayValuesList": [ 
     { 
     "value": "266.6264", 
     "dateTime": "2017-07-25 09:50:00" 
     } 
    ] 
    } 
}

雖然即使這樣，也需要添加dateTime屬性來DayValue。

來源

2017-07-25 14:42:22 glytching

數據模型映射與GSON返回null

回答

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