qt使用DOM和SAX两种方式读写XML文件，代码工程demo，亲测可用

#include "ctxml.h" #include <QDomDocument> #include <QFile> #include <QXmlStreamReader> #include <QXmlStreamWriter> CtXml::CtXml() { } CtXml::~CtXml() { } CtXml &CtXml::getInstance() { static CtXml s_obj; return s_obj; } void CtXml::on_writeToXmlFileWithDom(PERSION_T stPersion) { QDomDocument dDoc; QString sHeader("version=\"1.0\" encoding=\"UTF-8\""); dDoc.appendChild(dDoc.createProcessingInstruction("xml", sHeader));//生成说明 //生成根节点 QDomElement sRootElement = dDoc.createElement("Root"); dDoc.appendChild(sRootElement); QDomElement PersionElement = dDoc.createElement("Persion"); QDomElement Item1Element = dDoc.createElement("Item"); Item1Element.setAttribute("Name", "Name"); Item1Element.setAttribute("Type", "QString"); QDomText Item1Text = dDoc.createTextNode("Item"); Item1Text.setData(stPersion.sName); Item1Element.appendChild(Item1Text); PersionElement.appendChild(Item1Element); QDomElement Item2Element = dDoc.createElement("Item"); Item2Element.setAttribute("Name", "Age"); Item2Element.setAttribute("Type", "Int"); QDomText Item2Text = dDoc.createTextNode("Item"); Item2Text.setData(QString::number(stPersion.nAge)); Item2Element.appendChild(Item2Text); PersionElement.appendChild(Item2Element); QDomElement Item3Element = dDoc.createElement("Item"); Item3Element.setAttribute("Name", "Sex"); Item3Element.setAttribute("Type", "QString"); QDomText Item3Text = dDoc.createTextNode("Item"); Item3Text.setData(stPersion.Sex); Item3Element.appendChild(Item3Text); PersionElement.appendChild(Item3Element); QDomElement Item4Element = dDoc.createElement("Item"); Item4Element.setAttribute("Name", "Height"); Item4Element.setAttribute("Type", "Int"); QDomText Item4Text = dDoc.createTextNode("Item"); Item4Text.setData(QString::number(stPersion.nHeight)); Item4Element.appendChild(Item4Text); PersionElement.appendChild(Item4Element); QDomElement Item5Element = dDoc.createElement("Item"); Item5Element.setAttribute("Name", "Weight"); Item5Element.setAttribute("Type", "Int"); QDomText Item5Text = dDoc.createTextNode("Item"); Item5Text.setData(QString::number(stPersion.nWeight)); Item5Element.appendChild(Item5Text); PersionElement.appendChild(Item5Element); sRootElement.appendChild(PersionElement); QFile file(XML_FILE_PATH); if(!file.open(QFile::WriteOnly | QFile::Text | QFile :: Truncate))//Truncate:覆盖重写 { MY_DEBUG << "Open XML File Failed"; return; } file.write(dDoc.toString().toLocal8Bit().data()); file.close(); } void CtXml::on_readFromXmlFileWithDom() { QDomDocument dDoc; QFile file(XML_FILE_PATH); if(!file.open(QFile::ReadOnly | QFile::Text)) { MY_DEBUG << "Open XML File Failed"; return; } int iErrorLine; int iErrorCol; QString sErrorMsg; if (!dDoc.setContent(&file, false, &sErrorMsg, &iErrorLine, &iErrorCol)) { sErrorMsg = QString::fromLocal8Bit("Parse Failed."); MY_DEBUG << "sErrorMsg:" << sErrorMsg; file.close(); return; } file.close(); PERSION_T stPersion; QDomElement deRootNode = dDoc.documentElement(); if(deRootNode.tagName() == "Root") { MY_DEBUG << "readFromXmlFileWithDom 000"; QDomNode PersionNode = deRootNode.firstChild(); while(!PersionNode.isNull()) { MY_DEBUG << "readFromXmlFileWithDom 111"; QString sPersion = PersionNode.toElement().tagName(); if(!sPersion.compare("Persion")) { MY_DEBUG << "readFromXmlFileWithDom 222"; QDomNodeList ItemNodeList = PersionNode.childNodes(); for(int i = 0; i < ItemNodeList.size(); i++) { MY_DEBUG << "readFromXmlFileWithDom 333"; QDomElement ItemElement = ItemNodeList.at(i).toElement(); if(!ItemElement.tagName().compare("Item")) { MY_DEBUG << "readFromXmlFileWithDom 444"; if(ItemElement.hasAttribute("Name")) { MY_DEBUG << "readFromXmlFileWithDom 555"; QString str = ItemElement.attribute("Name"); if(!str.compare("Name")) { stPersion.sName = ItemElement.text(); } else if(!str.compare("Age")) { stPersion.nAge = ItemElement.text().toInt(); } else if(!str.compare("Sex")) { stPersion.Sex = ItemElement.text(); } else if(!str.compare("Height")) { stPersion.nHeight = ItemElement.text().toInt(); } else if(!str.compare("Weight")) { stPersion.nWeight = ItemElement.text().toInt(); } } } } } PersionNode = PersionNode.nextSibling(); } } emit sig_returnXmlData(stPersion); } void CtXml::on_writeToXmlFileWithSax(PERSION_T stPersion) { QFile file(XML_FILE_PATH2); if(!file.open(QFile::WriteOnly | QFile::Text | QFile :: Truncate)) { MY_DEBUG << "XML File Open Failed."; return; } QXmlStreamWriter xmlWrite(&file); xmlWrite.setAutoFormatting(true); xmlWrite.writeStartDocument("1.0",true); xmlWrite.writeStartElement("Root"); xmlWrite.writeStartElement("Persion"); xmlWrite.writeStartElement ("Item"); xmlWrite.writeAttribute("Name","Name"); xmlWrite.writeAttribute("Type","QString"); xmlWrite.writeCharacters(stPersion.sName); xmlWrite.writeEndElement(); xmlWrite.writeStartElement ("Item"); xmlWrite.writeAttribute("Name","Age"); xmlWrite.writeAttribute("Type","Int"); xmlWrite.writeCharacters(QString::number(stPersion.nAge)); xmlWrite.writeEndElement(); xmlWrite.writeStartElement ("Item"); xmlWrite.writeAttribute("Name","Sex"); xmlWrite.writeAttribute("Type","QString"); xmlWrite.writeCharacters(stPersion.Sex); xmlWrite.writeEndElement(); xmlWrite.writeStartElement ("Item"); xmlWrite.writeAttribute("Name","Height"); xmlWrite.writeAttribute("Type","Int"); xmlWrite.writeCharacters(QString::number(stPersion.nHeight)); xmlWrite.writeEndElement(); xmlWrite.writeStartElement ("Item"); xmlWrite.writeAttribute("Name","Weight"); xmlWrite.writeAttribute("Type","Int"); xmlWrite.writeCharacters(QString::number(stPersion.nWeight)); xmlWrite.writeEndElement(); xmlWrite.writeEndElement(); //Persion结束 xmlWrite.writeEndElement(); //Root结束 xmlWrite.writeEndDocument(); //Document结束 file.close(); } void CtXml::on_readFormXmlFileWithSax() { QFile file(XML_FILE_PATH2); if(!file.open(QFile::ReadOnly | QFile::Text)) { MY_DEBUG << "XML File Open Failed."; return; } PERSION_T stPersion; QXmlStreamReader xmlRead; xmlRead.setDevice(&file); if(xmlRead.readNextStartElement()) { if(xmlRead.name().toString() == "Root") { if(xmlRead.readNextStartElement()) { if(xmlRead.name().toString()