一 环境部署

QT的配置文件中添加xml选项：

 二 写入xml文件

头文件：#include <QXmlStreamWriter>

bool MyXML::writeToXMLFile()
{QString currentTime = QDateTime::currentDateTime().toString("yyyyMMddhhmmss");QString fileName = "./testWrite.xml";QFile file(fileName);//QIODevice::Truncate 以重写的方式打开，在写入新的数据时会将原有数据全部清除if(!file.open(QIODevice::WriteOnly | QIODevice::Text |QIODevice::Truncate)){qDebug()<<"open xml file failed!";return false;}QXmlStreamWriter write(&file);//设置自动格式化，包括自动换行缩进等write.setAutoFormatting(true);write.writeStartDocument("1.0");//写入常规信息write.writeStartElement("SomebodyInfo");write.writeTextElement("name","abby");write.writeTextElement("age",QString::number(18));write.writeTextElement("sex","girl");//写入数组for(int i = 0; i < 2; i++){write.writeStartElement("hobby");write.writeAttribute("No",QString::number(i));write.writeTextElement("name",QString("piano").append(QString::number(i)));write.writeEndElement();}write.writeEndElement();write.writeEndDocument();file.close();return true;
}

写入的文件如图：

 

三 解析xml文件

头文件：#include <QXmlStreamReader>

bool MyXML::parseXMLFile()
{QString fileName = "./testWrite.xml";QFile file(fileName);if(!file.open(QIODevice::ReadOnly | QIODevice::Text)){qDebug()<<"open xml file failed!";return false;}QXmlStreamReader reader(&file);//过滤首行reader.readNext();while(!reader.atEnd()){reader.readNext();if(reader.isStartElement()){if(reader.name() == "name"){qDebug()<<"name = "<<reader.readElementText();}else if(reader.name() == "age"){qDebug()<<"age = "<<reader.readElementText();}else if(reader.name() == "sex"){qDebug()<<"sex = "<<reader.readElementText();}else if(reader.name() == "hobby"){parseHobby(reader);}}else if(reader.isEndElement()){break;}}
}

 解析其中的Hobby模块：

bool MyXML::parseHobby(QXmlStreamReader &reader)
{QVector<QString> hobbyVec;QString hobby;while(!reader.atEnd()){reader.readNext();if(reader.isStartElement()){if(reader.name() == "name"){hobby = reader.readElementText();hobbyVec.push_back(hobby);}}else if(reader.isEndElement()){for(int i = 0; i < hobbyVec.size();i++){qDebug()<<"hobby i= "<<QString::number(i)<<"name = "<<hobbyVec[i];}break;}}
}

输出结果：