Qt解析XML的示例代码分享

如何使用QXmlStreamReader来解析格式良好的XML，Qt的文档中指出，它是一种更快、更方便的Qt自己的SAX解析器（QXmlSimpleReader）的替代，它也较快，在某种情况下，比DOM（QDomDocument）更方便。

XML文件：

解析方法：

void ParseXML::parseXML(QString file_name)  {  if(file_name.isEmpty())            return;            QFile *file = new QFile(file_name);        if(!file->open(QFile::ReadOnly | QFile::Text))  {    QMessageBox::information(NULL, QString("title"), QString("open error!"));          return;        }        //QXmlStreamReader操作任何QIODevice.      QXmlStreamReader xml(file);      QList> persons;      //解析XML，直到结束      while(!xml.atEnd() && !xml.hasError())  {          //读取下一个element.          QXmlStreamReader::TokenType token = xml.readNext();          //如果获取的仅为StartDocument,则进行下一个          if(token == QXmlStreamReader::StartDocument)  {              continue;          }          //如果获取了StartElement,则尝试读取          if(token == QXmlStreamReader::StartElement)  {              //如果为persons，直接进入下一个              if(xml.name() == "persons")  {                  continue;              }                //如果为person，则对其进行解析              if(xml.name() == "person")  {                  persons.append(this->parsePerson(xml));              }          }      }          if(xml.hasError())  {  QMessageBox::information(NULL, QString("parseXML"), xml.errorString());      }        //从reader中删除所有设备、数据，并将其重置为初始状态      xml.clear();  }     QMap ParseXML::parsePerson(QXmlStreamReader& xml)  {      QMap person;      //检查是否获取person      if(xml.tokenType() != QXmlStreamReader::StartElement &&              xml.name() == "person")  {          return person;      }      //获取person属性      QXmlStreamAttributes attributes = xml.attributes();      if(attributes.hasAttribute("id"))  {          person["id"] = attributes.value("id").toString();      }        //操作下一个      xml.readNext();      while(!(xml.tokenType() == QXmlStreamReader::EndElement &&              xml.name() == "person"))  {          if(xml.tokenType() == QXmlStreamReader::StartElement)  {              if(xml.name() == "name")  {                  this->addElementDataToMap(xml, person);              }                           if(xml.name() == "age")  {                  this->addElementDataToMap(xml, person);              }                          if(xml.name() == "email")  {                  this->addElementDataToMap(xml, person);              }                          if(xml.name() == "website")  {                  this->addElementDataToMap(xml, person);              }          }                 xml.readNext();      }  QString id = person["id"];      QString name = person["name"];      QString age =  person["age"];      QString email = person["email"];      QString website = person["website"];      return person;  }     void ParseXML::addElementDataToMap(QXmlStreamReader& xml,                                        QMap& map) const  {      if(xml.tokenType() != QXmlStreamReader::StartElement)  {          return;      }      QString elementName = xml.name().toString();      xml.readNext();            if(xml.tokenType() != QXmlStreamReader::Characters)   {          return;      }            map.insert(elementName, xml.text().toString());  }

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