前言:当使用gson进行json字符串转换成Object或Map<String, Object>时,数据中的所有数值型数据都会被转换成Double类型,即:0被转换成0.0,对此提供以下解决方案:
一、重写TypeAdapter
/**
* 重写 GSON 中的 TypeAdapter
* @Author: CcchenCoco
* @Version: V1.0 ObjectTypeAdapterRewrite, 2022/4/21 19:51
**/
public class ObjectTypeAdapterRewrite extends TypeAdapter<Object> {
@Override
public Object read(JsonReader in) throws IOException {
JsonToken token = in.peek();
switch (token) {
case BEGIN_ARRAY:
List<Object> list = new ArrayList<>();
in.beginArray();
while (in.hasNext()) {
list.add(read(in));
}
in.endArray();
return list;
case BEGIN_OBJECT:
Map<String, Object> map = new LinkedTreeMap<>();
in.beginObject();
while (in.hasNext()) {
map.put(in.nextName(), read(in));
}
in.endObject();
return map;
case STRING:
return in.nextString();
case NUMBER:
/**
* 改写数字的处理逻辑,将数字值分为整型与浮点型。
*/
double dbNum = in.nextDouble();
// 数字超过long的最大值,返回浮点类型
if (dbNum > Long.MAX_VALUE) {
return dbNum;
}
// 判断数字是否为整数值
long lngNum = (long) dbNum;
if (dbNum == lngNum) {
try {
return (int) lngNum;
} catch (Exception e) {
return lngNum;
}
} else {
return dbNum;
}
case BOOLEAN:
return in.nextBoolean();
case NULL:
in.nextNull();
return null;
default:
throw new IllegalStateException();
}
}
@Override
public void write(JsonWriter out, Object value) throws IOException {
}
}
二、创建Gson对象
Gson gson = new GsonBuilder().registerTypeAdapter(new TypeToken<Map<String,Object>>(){}.getType(), new ObjectTypeAdapterRewrite()).create();