httpclient获取返回的json串会自动转换成科学计数法

在用httpclient获取返回的json数据时，有个值是5000000.0，在用EntityUtils.toString(entity, "utf-8");转换的时候会变成5.0E7，哪位知道怎么处理吗？

 String responseMsg = "";
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpGet httpget = getHttpGet(url);

        try {
            httpget.setHeader("Content-Type", "application/xml; charset=utf-8");
            httpget.setHeader("User-Agent",
                    "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.81 Safari/537.36");
            CloseableHttpResponse response = httpClient.execute(httpget);
            try {
                HttpEntity entity = response.getEntity();
                if (entity != null) {
                    responseMsg = EntityUtils.toString(entity, "utf-8");
                }
            } finally {
                response.close();
            }
            httpClient.close();
        } catch (Exception e) {
            throw new SystemException("webservice请求异常", e);
        } finally {
            httpget.releaseConnection();
            httpClient.close();
            // httpClient.getConnectionManager().shutdown();
        }
        return responseMsg;

jdk自带的和OkHttp包也是同样返回

看到这个，也卡了半天，可以用这种方式实现：
使用com.alibaba.fastjson包先转换为json，再转换为string。
public String toJsonThenToString(String responseMsg){
try{
JSONObject jsonObject=JSON.parseObject(responseMsg);
return JSON.toJSONString(jsonObject);
}catch(Exception e){
return responseMsg;
}
}

如果你一定要转码的话，那就是转码方法里面转换的，那你拿到值的时候再转一遍吧

确实是这样的，但是如果是 EntityUtils.toString(entity, "utf-8"); 该方法转换的，那你也没办法去改他的源码 啊！你可以采用别的方式转码，获取使用反射封装一个方法，将对象转map