Qt5 json 数据处理

 QT4中使用第三方库QJson解析JSON文件。  

QT5新增加了处理JSON的类，类均以QJson开头，包含在QtCore模块中。

用到的头文件

#include <QJsonArray>

#include <QJsonDocument>

#include <QJsonObject>

json解析

 1. 

QByteArray jsonData = "[{"id":"11", "name":"aaa"},"
                        "{"id":"22", "name":"bbb"},"
                        "{"id":"33", "name":"ccc"}]";
     
     QJsonParseError jsonError;
     QJsonDocument jsonDoucment = QJsonDocument::fromJson(jsonData, &jsonError);
     if(jsonError.error == QJsonParseError::NoError){
         
          if(!(jsonDoucment.isNull()||jsonDoucment.isEmpty())){
              
              QVariantList dataList=jsonDoucment.toVariant().toList();
              foreach (QVariant data, dataList) {
                  QVariantMap dataMap=data.toMap();
                  qDebug()<<"id:"<<dataMap["id"].toString()<<"name:"<<dataMap["name"].toString();
              }
          }

     }else{
         
         //检查错误类型
         qDebug()<<"jsonError:"<<jsonError.errorString();
     }

 2.生成json

QJsonArray jsonArray;
    QJsonObject jsonObj1;
    jsonObj1.insert ("task_name","task1");
    jsonObj1.insert ("task_status:","ok");
    jsonObj1.insert ("task_time:","2019_3_26");

    QJsonObject jsonObj2;
    jsonObj2.insert ("task_name","task2");
    jsonObj2.insert ("task_status:","error");
    jsonObj2.insert ("task_time:","2019_3_27");

    jsonArray.append (jsonObj1);
    jsonArray.append (jsonObj2);

     qDebug()<<jsonArray;

QJsonArray([{"task_name":"task1","task_status:":"ok","task_time:":"2019_3_26"},{"task_name":"task2","task_status:":"error","task_time:":"2019_3_27"}])