boost解析json文件

#include <boost/property_tree/ptree.hpp>  
#include <boost/property_tree/json_parser.hpp>  
#include <string>
#include <iostream>
using namespace std;
const std::string file_path = "./test.txt";
void generate_user()
{
    boost::property_tree::ptree root;
    boost::property_tree::ptree items;

    boost::property_tree::ptree item1;
    item1.put("ID", "1");
    item1.put("Name", "wang");
    items.push_back(std::make_pair("1", item1));




    boost::property_tree::ptree item2;
    item2.put("ID", "2");
    item2.put("Name", "zhang");
    items.push_back(std::make_pair("2", item2));


    boost::property_tree::ptree item3;
    item3.put("ID", "3");
    item3.put("Name", "li");
    items.push_back(std::make_pair("3", item3));


    root.put_child("user", items);
    boost::property_tree::write_json(file_path, root);
}
void read_user()
{


    boost::property_tree::ptree root;
    boost::property_tree::ptree items;
    boost::property_tree::read_json<boost::property_tree::ptree>(file_path, root);


    items = root.get_child("user");
    for (boost::property_tree::ptree::iterator it = items.begin(); it != items.end(); ++it)
    {
        //遍历读出数据 
        string key = it->first;//key ID 
        string ID = it->second.get<string>("ID");
        string Name = it->second.get<string>("Name");
        std::cout << key << " " << ID << " " << Name << std::endl;
    }
}
void main()
{
    generate_user();
    read_user();

}

结果：

{
    "user": { "1": { "ID": "1", "Name": "wang" }, "2": { "ID": "2", "Name": "zhang" }, "3": { "ID": "3", "Name": "li" } } }