Warning: file_get_contents(/data/phpspider/zhask/data//catemap/6/haskell/10.json): failed to open stream: No such file or directory in /data/phpspider/zhask/libs/function.php on line 167

Warning: Invalid argument supplied for foreach() in /data/phpspider/zhask/libs/tag.function.php on line 1116

Notice: Undefined index: in /data/phpspider/zhask/libs/function.php on line 180

Warning: array_chunk() expects parameter 1 to be array, null given in /data/phpspider/zhask/libs/function.php on line 181
Java GSON:使用随机类名反序列化Json_Java_Gson - Fatal编程技术网

Java GSON:使用随机类名反序列化Json

Java GSON:使用随机类名反序列化Json,java,gson,Java,Gson,我试图使用GSON将一些Json反序列化为一个漂亮整洁的对象。现在,我已经设法让Json正确地映射到一些更明显的变量。然而,在尝试映射一些Json时,我遇到了以下问题: { "this_number": 1, "that_number": 12, "some_string": "String!", "list_of_objects": { "342356676784653234535345": { "random_doubl

我试图使用GSON将一些Json反序列化为一个漂亮整洁的对象。现在,我已经设法让Json正确地映射到一些更明显的变量。然而,在尝试映射一些Json时,我遇到了以下问题:

{
    "this_number": 1,
    "that_number": 12,
    "some_string": "String!",
    "list_of_objects": {
        "342356676784653234535345": {
            "random_double": "0.1235667456456",
            "magic": "29",
            "health": 1,
            "price": 7,
            "point": {
                "x": 2,
                "y": 70
            }
        },
        "2345263767467354": {
            "random_double": "0.1235667456456",
            "magic": "23",
            "health": 1,
            "price": 9,
            "point": {
                "x": 0,
                "y": 70
            }
        }
    }
}
它映射得很好,直到我来到
“对象列表”
。我一辈子都想不出如何实施它。我认为主要的问题是它们不再是静态的类名,而是随机化的。因此,写这样的东西是完全不切实际的(也是不可能的):

class 342356676784653234535345{
    double random_double = 0.0;
    //etc
}
我已经环顾了Stackoverflow,但答案似乎相当复杂,许多答案并不完全符合我想知道的

我已经研究过使用的普通对象方法,但是我找不到关于其用法的任何进一步信息


我也一直在寻找映射到泛型类型的引用,但我不太明白到底发生了什么

您可以使用自定义Gson
JsonDeserializer将JSON字符串转换为等效的Java对象

假设您有映射类

public class Data {
    private int this_number;
    private int that_number;
    private String some_string;
    private List<DataInfo> objects;
}

public class DataInfo {
    private double random_double;
    private int magic;
    private int health;
    private int price;
}

public class Point {
    int x ;
    int y;
}
公共类数据{
私人int此_编号;
私人int表示_编号;
私有字符串一些_字符串;
私有列表对象;
}
公共类数据信息{
私人双随机双;
私人魔法;
私人卫生;
私人int价格;
}
公共课点{
int x;
int-y;
}
自定义反序列化程序

public class CustomDeserializer implements JsonDeserializer<Data> {

    @Override
    public Data deserialize(final JsonElement json, final Type typeOfT, final JsonDeserializationContext context) throws JsonParseException {
        final JsonObject jsonObject = json.getAsJsonObject();

        final int this_number = jsonObject.get("this_number").getAsInt();
        final int that_number = jsonObject.get("that_number").getAsInt();
        final String some_string = jsonObject.get("some_string").getAsString();

        JsonObject list_of_objects =jsonObject.get("list_of_objects").getAsJsonObject();

        Set<Entry<String, JsonElement>> objects =  list_of_objects.entrySet();

        final Data data = new Data();
        List<DataInfo> list = new ArrayList<>();

        Gson gson = new Gson();

        for (Entry<String, JsonElement> entry : objects) {
            JsonElement jsonElement  = entry.getValue();
            DataInfo info = gson.fromJson(jsonElement,DataInfo.class);
            list.add(info);
        }

        data.setObjects(list);
        data.setSome_string(some_string);
        data.setThat_number(that_number);
        data.setThis_number(this_number);

        return data;
    }
}
公共类CustomDeserializer实现JsonDeserializer{
@凌驾
公共数据反序列化(最终JsonElement json、最终类型typeOfT、最终JsonDeserializationContext上下文)引发JsonParseException{
final JsonObject JsonObject=json.getAsJsonObject();
final int this_number=jsonObject.get(“this_number”).getAsInt();
final int that_number=jsonObject.get(“that_number”).getAsInt();
最后一个字符串some_String=jsonObject.get(“some_String”).getAsString();
JsonObject list_of_objects=JsonObject.get(“list_of_objects”).getAsJsonObject();
Set objects=list_of_objects.entrySet();
最终数据=新数据();
列表=新的ArrayList();
Gson Gson=新的Gson();
for(条目:对象){
JsonElement JsonElement=entry.getValue();
DataInfo=gson.fromJson(jsonElement,DataInfo.class);
列表。添加(信息);
}
数据集对象(列表);
data.setSome_字符串(some_字符串);
数据。设置该号码(该号码);
数据。设置此_编号(此_编号);
返回数据;
}
}
只需定义

Map<String, Inner> list_of_objects;

如果这些只是类实例的名称,请使用
Map
并将
YourType
实现为具有字段
randoom\u double
,等等。您可以添加如何调用CustomDeserializer吗?这也不使用点
package stackoverflow.questions.q23472175;

import java.util.Map;

import com.google.gson.Gson;

public class Q23472175 {

    private static class Point {
        int x;
        int y;
        @Override
        public String toString() {
            return "Point [x=" + x + ", y=" + y + "]";
        }


    }

    private static class Inner {
        String random_double;
        String magic;
        int health;
        int price;
        Point point;
        @Override
        public String toString() {
            return "Inner [random_double=" + random_double + ", magic=" + magic + ", health=" + health + ", price=" + price + ", point=" + point + "]";
        }




    }

    private static class Outer {
        int this_number;
        int that_number;
        String some_string;
        Map<String, Inner> list_of_objects;
        @Override
        public String toString() {
            return "Outer [this_number=" + this_number + ", that_number=" + that_number + ", some_string=" + some_string + ", list_of_objects=" + list_of_objects + "]";
        }


    }

    public static void main(String[] args) {
        String json = "{"+
                "    \"this_number\": 1,"+
                "    \"that_number\": 12,"+
                "    \"some_string\": \"String!\","+
                "    \"list_of_objects\": {"+
                "        \"342356676784653234535345\": {"+
                "            \"random_double\": \"0.1235667456456\","+
                "            \"magic\": \"29\","+
                "            \"health\": 1,"+
                "            \"price\": 7,"+
                "            \"point\": {"+
                "                \"x\": 2,"+
                "                \"y\": 70"+
                "            }"+
                "        },"+
                "        \"2345263767467354\": {"+
                "            \"random_double\": \"0.1235667456456\","+
                "            \"magic\": \"23\","+
                "            \"health\": 1,"+
                "            \"price\": 9,"+
                "            \"point\": {"+
                "                \"x\": 0,"+
                "                \"y\": 70"+
                "            }"+
                "        }"+
                "    }"+
                "}";

        Gson g = new Gson();
        Outer object = g.fromJson(json, Outer.class);
        System.out.print(object);

    }

}
Outer [this_number=1, that_number=12, some_string=String!, list_of_objects={342356676784653234535345=Inner [random_double=0.1235667456456, magic=29, health=1, price=7, point=Point [x=2, y=70]], 2345263767467354=Inner [random_double=0.1235667456456, magic=23, health=1, price=9, point=Point [x=0, y=70]]}]