JSON解析性能对比-CSDN博客

本文链接：https://blog.csdn.net/Pa_Java/article/details/81983664

前言：我们的项目主要是使用JSON串传递参数，前端调用接口的时候会传递一个JSON串，接口把JSON转成Map,便于编写业务的时候获取数据，今天发现我们把JSON转成Map的使用后了两种方法，突然想看看这两种方法的效率如何，在加上之前我个人非常喜欢的Fastjson

测试代码

String jsonString = "{\"operationIdList\":\"1495435403079\",\"maxResult\":9223372036854775807,\"firstResult\":0}";
for (int j = 0; j < 100; j++) {
    long strartTime = System.currentTimeMillis();
    for (int i = 0; i < 100000; i++) {
        GsonBuilder gb = new GsonBuilder();
        Gson g = gb.create();
        Map<String, String> map = g.fromJson(jsonString,new TypeToken<Map<String, String>>() {}.getType());
        map.get("operationIdList");
    }
    long endTime1 = System.currentTimeMillis();
    System.out.print(endTime1 - strartTime);
    for (int i = 0; i < 100000; i++) {
        Map<String, String> map = ConvertUtil.objToHashMap(jsonString);
        map.get("operationIdList");
    }
    long endTime2 = System.currentTimeMillis();
    System.out.print("===" + (endTime2 - endTime1));
    for (int i = 0; i < 100000; i++) {
        Map<String, String> map = JSON.parseObject(jsonString,Map.class);
        map.get("operationIdList");
    }
    long endTime3 = System.currentTimeMillis();
    System.out.println("===" + (endTime3 - endTime2));
}

其中ConvertUtil.objToHashMap的具体处理过程如下：

public static HashMap objToHashMap(Object object) {
    HashMap<String, Object> data = new HashMap<String, Object>();
    try {
        JSONObject jsonObject = toJSONObject(object);
        Iterator it = jsonObject.keys();
        while (it.hasNext()) {
            String key = String.valueOf(it.next());
            Object value = jsonObject.get(key);
            data.put(key, value);
        }
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    return data;
}