反序列化 json 数据时，是否可以将大双数转换为大十进制而不损失精度？

Question

Customer sends me a json double data like "amount": 123345555789123495.38 and in our program we get the whole message and program get the value like 1.23345555789123488E17 Is it possible to convert this data right with precision??

@JsonProperty("map") private ConcurrentHashMap<String, Object> extensionMap;

I tried new BigDecimal(String.valueOf(map.get("amount"))).setScale(2, BigDecimal.ROUND_HALF_EVEN);

Output is: 123345555789123488.00

Answer 1

Try following

import java.math.BigDecimal;

import static java.math.RoundingMode.HALF_UP;

public class Test {

public static void main(String[] args) {
    String jsonAmount = "123345555789123495.38";
    BigDecimal amount = new BigDecimal(jsonAmount).setScale(2, HALF_UP);
}

}