C++之RapidJSON解析json数据

RapidJSON 是一个 C++ 的 JSON 解析器及生成器。

JSON文本：

//document.json
{"name":"xiaoming","gender":"boy","hobby":["足球","篮球","电影"],"socre":{"数学":91.5,"英语":96.0,"语文":95.5},"lover":{"name":"xiaohong","gender":"girl","hobby":["画画","跳舞","唱歌"],"score":{"数学":78.5,"英语":90.0,"语文":89.0}}}

由于复制的过程中，json文本可以出现错误，可以用将json文本复制到JSON在线编辑器验证一下。

解析代码：

#include
#include
#include
#include"document.h"
using namespace std;

int main () {

  std::ifstream t("./document.json");
  std::string str((std::istreambuf_iterator(t)),
                  std::istreambuf_iterator());

  rapidjson::Document document;
  document.Parse(str.c_str());

  rapidjson::Value::ConstMemberIterator iter = document.FindMember("name");
  if(iter != document.MemberEnd()){
    cout << "name : " << iter->value.GetString() << endl;
  }

  iter = document.FindMember("gender");
  if(iter != document.MemberEnd()){
    cout << "gender : " << iter->value.GetString() << endl;
  }

  if(document.HasMember("hobby")){
    cout << "hobby : " << endl;
    const rapidjson::Value& childValue = document["hobby"];
    for(rapidjson::SizeType i = 0; i < childValue.Size(); ++i){
      cout << "    " << childValue[i].GetString() << endl;
    }
  }

  if(document.HasMember("score")){
    cout << "score : " << endl;
    const rapidjson::Value& childIter = document["score"];
    for(rapidjson::Value::ConstMemberIterator it = childIter.MemberBegin(); it != childIter.MemberEnd(); ++it){
      cout << "    " << it->name.GetString() << " : " << it->value.GetDouble() << endl;
    }
  }

  if(document.HasMember("lover")){
    cout << "lover : " << endl;
    const rapidjson::Value& chileValue = document["lover"];
    rapidjson::Value::ConstMemberIterator chileIter = chileValue.FindMember("name");
    if(chileIter != chileValue.MemberEnd()){
      cout << "    " << "name : " << chileIter->value.GetString() << endl;
    }

    chileIter = chileValue.FindMember("gender");
    if(chileIter != chileValue.MemberEnd()){
      cout << "    " << "gender : " << chileIter->value.GetString() << endl;
    }

    if(chileValue.HasMember("hobby")){
      cout << "    " << "hobby : " << endl;
      const rapidjson::Value& chile2Value = chileValue["hobby"];
      for(rapidjson::SizeType i = 0; i < chile2Value.Size(); ++i){
        cout << "        " << chile2Value[i].GetString() << endl;
      }
    }

    if(chileValue.HasMember("score")){
      cout << "    " << "score : " << endl;
      const rapidjson::Value& child2Iter = chileValue["score"];
      for(rapidjson::Value::ConstMemberIterator it = child2Iter.MemberBegin(); it != child2Iter.MemberEnd(); ++it){
        cout << "        " << it->name.GetString() << " : " << it->value.GetDouble() << endl;
      }
    }
  }
}

输出结果：

C++之RapidJSON生成json数据