這里使用的json解析工具為JSON for Modern C++,使用的話僅需要包含頭文件。
獲取方式：wget https://github.com/nlohmann/json/releases/download/v3.7.3/json.hpp

JSON

json的序列化功能和map一樣，用關聯數組的"[]"來任意添加數據，不需要指定數據類型，它會自動推導。添加完之后用dump完成序列化，得到json形式的文本。

#include <iostream>
#include <vector>
#include "json.hpp"
using json_t = nlohmann::json;
int main() {json_t j;                                     // json對象// 添加json對象j["age"] = 21;                                // "age":23j["name"] = "diyuyi";                         // "name":diyuyij["gear"]["suits"] = "2099";                  // "gear":{"suits":"2099"}j["jobs"] = {"student"};                      // "jobs":["student"]std::vector<int> v = {1, 2, 3};j["numbers"] = v;                             // "numbers":[1, 2, 3]std::map<std::string, int> m = {{"one", 1},{"two", 2}};j["map"] = m;                                 // "map":{"one", 1},{"two", 2}// 序列化得到json文本形式std::cout << j.dump() << std::endl;           // 無縮進std::cout << j.dump(2) << std::endl;   // 縮進兩格
}

結果：

{"age":21,"gear":{"suits":"2099"},"jobs":["student"],"map":{"one":1,"two":2},"name":"diyuyi","numbers":[1,2,3]}
{"age": 21,"gear": {"suits": "2099"},"jobs": ["student"],"map": {"one": 1,"two": 2},"name": "diyuyi","numbers": [1,2,3]
}

反序列話功能同樣簡單，調用靜態函數parse即可，直接得到json對象

#include <iostream>
#include <vector>
#include "json.hpp"
using json_t = nlohmann::json;
int main() {std::string str = R"({"name":"peter","age":23,"married":true})";json_t j;try {j = json_t::parse(str);                  // 從字符串反序列化}catch (std::exception& e){std::cout << e.what() << std::endl;}assert(j["age"] == 23); // 驗證序列化是否正確
}