Qt 读写xml文件

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//xml文件

<?xml version="1.0" encoding="UTF-8"?>
<Root>
    <item attr1="0" attr2="1"/>
    <itemList>
        <item1>0</item1>
        <item2>1</item2>
    </itemList>
</Root>

//qt代码

//QtReadWriteXML.h 头文件

#ifndef QT_READWRITEXML_H
#define QT_READWRITEXML_H

#include <QtGui>

class Qt_readWriteXML : public QWidget
{
   Q_OBJECT

public:
   Qt_readWriteXML(QWidget *parent = 0, Qt::WFlags flags = 0);
   ~Qt_readWriteXML();
private slots:
   void readXml();
   void writeXml();
};

#endif

//QtReadWriteXML.cpp原文件

#include "qt_readwritexml.h"
#include <QFile>
#include <QDomDocument>
#include <QXmlStreamWriter>

Qt_readWriteXML::Qt_readWriteXML(QWidget *parent, Qt::WFlags flags): QWidget(parent, flags)
{
   QVBoxLayout *lay=new QVBoxLayout();
   setLayout(lay);

   QPushButton *b1=new QPushButton("write");
   QPushButton *b2=new QPushButton("read");
   lay->addWidget(b1);
   lay->addWidget(b2);
   connect(b1,SIGNAL(clicked()),this,SLOT(writeXml()));
   connect(b2,SIGNAL(clicked()),this,SLOT(readXml()));
}

Qt_readWriteXML::~Qt_readWriteXML()
{

}

//读xml文件
void Qt_readWriteXML::readXml()
{
   QString filePath="e:/test.xml";
   QFile file(filePath);
   if (file.open(QFile::ReadOnly|QFile::Text))
   {
       QDomDocument dom;
       if (dom.setContent(&file))
       {
           QDomElement rootDom=dom.documentElement();
           if (rootDom.tagName()=="Root")
           {
               QDomNode subNode=rootDom.firstChild();
               while(!subNode.isNull())
               {
                   QDomElement subElement=subNode.toElement();
                   if (subElement.tagName()=="item")
                   {
                       for (int i=0;i<subElement.attributes().count();i++)
                       {
                           qDebug()<<subElement.attributes().item(i).nodeName();//attr1,attr2
                           qDebug()<<subElement.attributes().item(i).nodeValue().toInt();//0,1
                       }
                   }
                   else if (subElement.tagName()=="itemList")
                   {
                       QDomNode childNode=subElement.firstChild();
                       while(!childNode.isNull())
                       {
                           qDebug()<<childNode.toElement().nodeName();//item1,item2
                           qDebug()<<childNode.toElement().text();//0,1
                           childNode=childNode.nextSibling();
                       }
                   }
                   subNode=subNode.nextSibling();
               }
           }
       }
       file.close();
   }
}

//写xml文件
void Qt_readWriteXML::writeXml()
{
   QString filePath="e:/test.xml";
   QFile file(filePath);
   if (file.open(QFile::WriteOnly|QFile::Text))
   {
       QXmlStreamWriter xmlWriter(&file);
       xmlWriter.setAutoFormatting(true);
       xmlWriter.writeStartDocument();
       xmlWriter.writeStartElement("Root");

       xmlWriter.writeStartElement("item");
       xmlWriter.writeAttribute("attr1", "0");
       xmlWriter.writeAttribute("attr2", "1");
       xmlWriter.writeEndElement();

       xmlWriter.writeStartElement("itemList");
       xmlWriter.writeTextElement("item1","0");
       xmlWriter.writeTextElement("item2","1");
       xmlWriter.writeEndElement();

       xmlWriter.writeEndElement();
       xmlWriter.writeEndDocument();
       file.close();
   }
}

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