使用nlohmann json库进行序列化与反序列化

• nlohmann源码仓库：https://github.com/nlohmann/json
• 使用方式：将其nlohmann文件夹加入，包含其头文件json.hpp即可
• demo

#include <iostream>
#include "nlohmann/json.hpp"
#include <vector>using json = nlohmann::json;// 定义嵌套的结构体
struct Address
{std::string street;std::string city;
};// 定义包含多种数据类型和结构体数组的主结构体
struct Person
{std::string name;int age;bool isStudent;std::vector<int> grades;Address address;std::vector<Address> addresses;
};int main()
{// 创建一个Person结构体实例Person person;person.name = "John";person.age = 30;person.isStudent = false;person.grades = {90, 85, 92};person.address = {"123 Main St", "Anytown"};person.addresses = {{"456 Elm St", "Somewhere"}, {"789 Oak St", "Nowhere"}};// 序列化结构体到JSONjson jsonData = {{"name", person.name},{"age", person.age},{"isStudent", person.isStudent},{"grades", person.grades},{"address", {{"street", person.address.street}, {"city", person.address.city}}},{"addresses", json::array()}};jsonData["age"] = 20;for (const auto &addr : person.addresses){jsonData["addresses"].push_back({{"street", addr.street},{"city", addr.city}});}// 将JSON对象转换为字符串std::string jsonString = jsonData.dump(4); // 4-space indentation for pretty formatting// 打印生成的JSON字符串std::cout << "Generated JSON:" << std::endl;std::cout << jsonString << std::endl;// 反序列化JSON字符串到结构体Person parsedPerson;json parsedData = json::parse(jsonString);parsedPerson.name = parsedData["name"];parsedPerson.age = parsedData["age"];parsedPerson.isStudent = parsedData["isStudent"];std::vector<int> parsedGrades = parsedData["grades"].get<std::vector<int>>();parsedPerson.address.street = parsedData["address"]["street"];parsedPerson.address.city = parsedData["address"]["city"];parsedPerson.addresses.clear();for (const auto &addr : parsedData["addresses"]){Address parsedAddr;parsedAddr.street = addr["street"];parsedAddr.city = addr["city"];parsedPerson.addresses.push_back(parsedAddr);}// 打印反序列化后的结构体成员std::cout << "Name: " << parsedPerson.name << std::endl;std::cout << "Age: " << parsedPerson.age << std::endl;std::cout << "Is Student: " << parsedPerson.isStudent << std::endl;std::cout << "Grades: ";for (int grade : parsedPerson.grades){std::cout << grade << " ";}std::cout << std::endl;std::cout << "Address: Street: " << parsedPerson.address.street << ", City: " << parsedPerson.address.city << std::endl;std::cout << "Addresses:" << std::endl;for (const auto &addr : parsedPerson.addresses){std::cout << "Street: " << addr.street << ", City: " << addr.city << std::endl;}return 0;
}