怎么取出json里的size然后除以map集合里的每个值

maps集合里面的结果需要除以总数，然后使用DecimalFormat弄成百分比，

所以是要显示两位小数嘛？

示例代码如下:

public class App {

    public static void main(String[] args) {
        String resultStr = " \n" +
                "{\n" +
                "        \"code\": 200,\n" +
                "        \"data\":{\n" +
                "        \"records\":[\n" +
                "        {\n" +
                "        \"id\":917834041955188736,\n" +
                "        \"alertTime\":\"2021-12-07 17:44:48\",\n" +
                "        \"messageType\":3,\n" +
                "        \"snapId\":101124,\n" +
                "         \"rank\":\"1\",\n" +
                "        \"alertText\":\"低电压穿越保护\",\n" +
                "        },\n" +
                "        {\n" +
                "        \"id\":917834020232888320,\n" +
                "        \"alertTime\":\"2021-12-07 17:44:42\",\n" +
                "        \"messageType\":1,\n" +
                "        \"snapId\":101124,\n" +
                "        \"rank\":\"3\",\n" +
                "        \"alertText\":\"低电压穿越保护\",\n" +
                "        },\n" +
                "        {\n" +
                "        \"id\":917833742737735680,\n" +
                "        \"alertTime\":\"2021-12-07 17:43:36\",\n" +
                "        \"messageType\":3,\n" +
                "        \"snapId\":101124,\n" +
                "        \"rank\":\"2\",\n" +
                "        \"alertText\":\"低电压穿越保护\",\n" +
                "        },\n" +
                "        {\n" +
                "        \"id\":917833717546745856,\n" +
                "        \"alertTime\":\"2021-12-07 17:43:30\",\n" +
                "        \"messageType\":1,\n" +
                "        \"snapId\":101124,\n" +
                "        \"rank\":\"3\",\n" +
                "        \"alertText\":\"低电压穿越保护\",\n" +
                "        }\n" +
                "        ],\n" +
                "       \"size\": 20,\n" +
                "     }\n" +
                "  }";
        JSONObject result = JSONObject.parseObject(resultStr);
        JSONArray records = result.getJSONObject("data").getJSONArray("records");
        Integer size = result.getJSONObject("data").getInteger("size");

        // 结果
        Map<String, Double> data = records.toJavaList(JSONObject.class)
                .stream().collect(Collectors.groupingBy(item -> "rank" + item.getInteger("rank"), Collectors.counting()))
                .entrySet().stream().collect(Collectors.toMap(Map.Entry::getKey, entry -> entry.getValue() * 1.0 / size));
        // {"rank1":0.05,"rank2":0.05,"rank3":0.1}
        System.out.println(JSONObject.toJSONString(data));
    }
}

如有帮助，请采纳。

把这几行改一下

int sum = a + b + c + d + e;
Map<String, Float> maps = new LinkedHashMap<>();
maps.put("rank1", getValue(a, sum));
maps.put("rank2", getValue(b, sum));
maps.put("rank3", getValue(c, sum));
maps.put("rank4", getValue(d, sum));
maps.put("rank5", getValue(e, sum));

float getValue(int n, int sum) {
    return (float) Math.round((float) n * 100 / sum) / 100;
}