C++ json递归解析

#include "rapidjson/document.h"
#include "rapidjson/writer.h"
#include "rapidjson/stringbuffer.h"
#include "rapidjson/filereadstream.h"
#include <iostream>
#include <string>
#include <map>
#include <fstream>
#include <rapidjson/istreamwrapper.h>
using namespace rapidjson;
using namespace std;
Document doc;
void JsonToMap(const Value &val);
void stringToJsonObject(std::string filePath){
    ifstream ifs(filePath);
    IStreamWrapper is(ifs);
    
    doc.ParseStream(is);
    JsonToMap(doc);

}
//string key, value
// 只有一个层级的
//map<string,string>
//map<string,bool>
//map<string,int>
//map<string,vector<student>>
//map<string,student>
//map<string,map<int type,student>>
//map<string,map<int type,int>>
//map<string,map<int type,vector<int>>>

map<string,string>ms;
map<string,int>mi;
map<string,bool>mb;

template<typename T>
map<string,T>mt;

bool getBasicVal(const string &str,const Value &val){
    if(val.IsBool()){
        mb[str]=val.GetBool();
        return true;
    }else if(val.IsInt()){
        mi[str]=val.GetInt();
        return true;
    }else if(val.IsString()){
        ms[str]=val.GetString();
        return true;
    }
    return false;
}

void JsonToMap(const Value &val){
    for(auto &m : val.GetObject()){
        if(strcmp(m.name.GetString(),"services") == 0){
            cout<<" parse customize type"<<endl;

        }else if(getBasicVal(m.name.GetString(),val[m.name.GetString()])){

        }else if(val[m.name.GetString()].IsArray()){
            const Value &arr = val[m.name.GetString()];
            for(rapidjson::SizeType i=0; i<arr.Size(); i++ ){
                JsonToMap(arr[i]);
            }
        }
        else if(val[m.name.GetString()].IsObject()){
            JsonToMap(val[m.name.GetString()]);
        }
    }
}
template <typename map>
void printMap(map m){
    for(auto iter = m.begin(); iter != m.end(); ++iter){
        cout<<iter->first<<"="<<iter->second<<endl;
    }
}
int main() {
    // 1. 把 JSON 解析至 DOM。
    string filePath = "/home/ygy/work/gos/src/ara/utils/tests/dds.json";
    stringToJsonObject(filePath);

    printMap(ms);
    cout<<"-------\n";
    printMap(mi);
    cout<<"-------\n";
    printMap(mb);
    cout<<"-------\n";
    return 0;

}

如果是自定义类型，需要自定义解析结构体。

如果是想加字段，字段的位置可以是任何位置的key和value。

只要key不和之前的重名。

那么保存到map中的数据就是唯一的。

{
  "applicationName": "/huawei/ap/SwComponent/dds_event_sync_client_sample/DdsEventSyncClientSampleProcess",
  "object1":{
    "serviceId": 101,
    "serviceId1": 101,
    "protocolIdUsed": false
  },
  "fields":    {"serviceId2": 101,
    "serviceId13": 101,
    "protocolIdUsed1": false},
    "events": [
      {
        "event": "CameraImageEvent",
        "id": 19958,
        "isDpRawData": false,
        "dataType": "/huawei/ap/EventDataType/CameraImage/EventSyncImage",
        "topicName": "cameraImageEvent"
      }
    
  ],
  "services": [
    {
      "service": "/huawei/ap/ServiceInterface/DdsEventSyncSample",
      "serviceId": 101,
      "serviceId1": 101,
      "protocolIdUsed": false,
      "new" :1,
      "events": [
        {
          "event": "CameraImageEvent",
          "id": 19958,
          "isDpRawData": false,
          "dataType": "/huawei/ap/EventDataType/CameraImage/EventSyncImage",
          "topicName": "cameraImageEvent"
        }
      ],
      "fields": [   {"serviceId2": 101,
        "serviceId13": 101,
        "protocolIdUsed1": false}],
      "methods": [],
      "instances": [
        {
          "shortName": "/huawei/ap/Service/instance/DdsEventSyncClientInstance",
          "instance": "1",
          "domainId": 0,
          "network": "192.168.10.6",
          "isClient": true,
          "fastSerialize": true,
          "qosProfile": "/var/domainqos.xml",
          "majorVersion": 12,
          "minVersion": 56,
          "events": [
            {
              "id": 19958,
              "qosProfile": "/var/eventsqos.xml"
            }
          ],
          "fields": [],
          "methods": []
        }
      ]
    }
  ]
}

ygy@ygy-VirtualBox:~/work/gos/build$ ./bin/json_test_test 
 parse customize type
applicationName=/huawei/ap/SwComponent/dds_event_sync_client_sample/DdsEventSyncClientSampleProcess
dataType=/huawei/ap/EventDataType/CameraImage/EventSyncImage
event=CameraImageEvent
topicName=cameraImageEvent
-------
id=19958
serviceId=101
serviceId1=101
serviceId13=101
serviceId2=101
-------
isDpRawData=0
protocolIdUsed=0
protocolIdUsed1=0
-------

http://rapidjson.org/zh-cn/md_doc_tutorial_8zh-cn.html