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[英]How do I override a Java map when converting a JSON to Java Object using GSON?
[英]How do I make Java Object from this JSON with GSON?
JSON:
{"station":[{"id":"p2","websiteId":"p2","name":,"label":"Price","latitude":,"longitude":,"zip":"","region":"South"}],"parameters":{"ozone":{"value":"0.044","unit":" ppm","color":"17,250,11","colorHex":"11fa11","arrow":"unchange_gray"},"pm25":{"value":"NA","unit":"","color":"000000","colorHex":"000000","arrow":""},"temperature":40.4,"wind_speed":4.5,"wind_dir":"SE"},"seasonalParameter":"ozone","forecast":[],"version":"1.5"}
我对这些物体的尝试:
public class AirObjects {
@SerializedName("station")
public List<Station> stationData;
public class Station {
@SerializedName("id")
public String id;
@SerializedName("parameters")
public Parameters parameters;
}
protected class Ozone
{
@SerializedName("value")
public String ozone_value;
@SerializedName("unit")
public String ozone_unit;
@SerializedName("colorHex")
public String ozone_color;
@SerializedName("arrow")
public String arrow;
}
protected class Parameters
{
@SerializedName("ozone")
public Ozone ozone;
@SerializedName("temperature")
public String temperature;
@SerializedName("wind_speed")
public String windSpeed;
@SerializedName("wind_dir")
public String windDirection;
}
protected class Sites
{
@SerializedName("id")
public String id;
@SerializedName("websiteId")
public String websiteId;
@SerializedName("name")
public String name;
@SerializedName("label")
public String label;
@SerializedName("latitude")
public String latitude;
@SerializedName("longitude")
public String longitude;
@SerializedName("zip")
public String zip;
@SerializedName("region")
public String region;
}
}
这是json的结构(您可以使用http://jsonviewer.stack.hu查看json值的结构):
现在,您应该为此结构定义POJO。
station
数组, parameters
对象, seasonalParameter
parameters
字符串, version
字符串和forecast
数组。 因此,您应该定义一个包含这些字段的POJO。 station
是一个具有一个对象的数组,该对象具有id
, websiteId
, name
等字段。 因此,您应该为具有这些字段的工作站定义一个POJO。 parameters
是一个具有ozone
, pm25
, temperature
, wind_speed
和wind_dir
字段的对象。 因此,您应该定义一个具有这些字段的POJO。 ozone
和pm25
具有相同的场,因此它们应该是同一类的实例。 您应该为它们定义一个POJO。 现在让我们看一下我们的POJOS:1)您的第一级POJO:
public class Holder {
private Station[] station;
private Parameters parameters;
private String seasonalParameter;
private String version;
private Object[] forecast;
}
2)POJO站:
public class Station {
private String id;
private String websiteId;
private String name;
private String label;
private String latitude;
private String longitude;
private String zip;
private String region;
}
3)POJO用于参数字段:
public class Parameters {
private Param ozone;
private Param pm25;
private double temperature;
private double wind_speed;
private String wind_dir;
}
4)适用于臭氧和pm25领域的POJO:
public class Param {
private String value;
private String unit;
private String color;
private String colorHex;
private String arrow;
}
测试:
String json = "{\"station\":[{\"id\":\"p2\",\"websiteId\":\"p2\",\"name\":\"\",\"label\":\"Price\",\"latitude\":\"\",\"longitude\":\"\",\"zip\":\"\",\"region\":\"South\"}],\"parameters\":{\"ozone\":{\"value\":\"0.044\",\"unit\":\" ppm\",\"color\":\"17,250,11\",\"colorHex\":\"11fa11\",\"arrow\":\"unchange_gray\"},\"pm25\":{\"value\":\"NA\",\"unit\":\"\",\"color\":\"000000\",\"colorHex\":\"000000\",\"arrow\":\"\"},\"temperature\":40.4,\"wind_speed\":4.5,\"wind_dir\":\"SE\"},\"seasonalParameter\":\"ozone\",\"forecast\":[],\"version\":\"1.5\"}";
Gson gson = new Gson();
Holder item = gson.fromJson(json, Holder.class);
注意:您共享的Json示例不是有效的json。 “ name”:,“ latitude”:,“ longitude”:,更改为“ name”:“”,“ latitude”:“”,“ longitude”:“”使您的json有效。
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