#include <xercesc/dom/DOMDocumentType.hpp>#include <xercesc/dom/DOMElement.hpp>#include <xercesc/dom/DOMImplementation.hpp>#include <xercesc/dom/DOMImplementationLS.hpp>#include <xercesc/dom/DOMNodeIterator.hpp>#include <xercesc/dom/DOMNodeList.hpp>#include <xercesc/dom/DOMNamedNodeMap.hpp>#include <xercesc/dom/DOMText.hpp>#include <xercesc/dom/DOMAttr.hpp>#include <xercesc/dom/DOMTreeWalker.hpp>#include <xercesc/parsers/XercesDOMParser.hpp>#include <xercesc/util/XMLUni.hpp>#include <xercesc/framework/XMLFormatter.hpp>#include <xercesc/util/XMLString.hpp>#include <stdlib.h>#include <string>#include <vector>#include <map>#include <stdexcept>using namespace std;using namespace xercesc;class ReadXml{public:    ReadXml();    ~ReadXml();void xmlParser(string&) throw(std::runtime_error);int loopXMLElement(DOMNode *node);

private:    XercesDOMParser *m_DOMXmlParser;    typedef map<string ,string> DATA_INFORMATION;    DATA_INFORMATION dataMap;

};

#include <string>#include <iostream>#include <sstream>#include "ReadXML.h"

ReadXml::ReadXml(){try    {        XMLPlatformUtils::Initialize();//初始化类库

    }catch (xercesc::XMLException& excp)    {char* msg = XMLString::transcode(excp.getMessage());        printf("XML tookit initialization error: %S\n",msg);        XMLString::release(&msg);    }    m_DOMXmlParser = new XercesDOMParser;

}ReadXml::~ReadXml(){try    {        XMLPlatformUtils::Terminate();    }catch(XMLException& excp)    {char* msg = XMLString::transcode(excp.getMessage());        printf("XML toolkit terminate error: %s\n", msg);        XMLString::release(&msg);    } }

void ReadXml::xmlParser(string& xmlFile) throw(std::runtime_error){

    m_DOMXmlParser->setValidationScheme(XercesDOMParser::Val_Auto);//采用Schemal自动验证

/*设置Parser是否处理xml文档中的名域，如果为true,则Parser增强名域定义的约束和规则。*/    m_DOMXmlParser->setDoNamespaces( false );

/*设置Parser处理xml文档中的schema,false就是不处理 */    m_DOMXmlParser->setDoSchema( false );/**/    m_DOMXmlParser->setLoadExternalDTD( false );try    {/*Parser解析器调用parse方法解析XML，安装解析器设置的各种参数，执行Schemal验证，将XML读取到内存，并成为一个DOM树形结构*/        m_DOMXmlParser->parse(xmlFile.c_str()) ;

//取得DOM数据        DOMDocument* xmlDoc = m_DOMXmlParser->getDocument();//取得根结点        DOMElement *pRoot = xmlDoc->getDocumentElement();

if (!pRoot )        {throw(std::runtime_error( "empty XML document" ));        }//创建一个 walker to 遍历结点//DOMNodeFilter::SHOW_ELEMENT显示元素结点，SHOW_TEXT显示文本结点        DOMTreeWalker* walker = xmlDoc->createTreeWalker(pRoot,DOMNodeFilter::SHOW_ELEMENT,0,true);        std::cout<<"TreeWalker:\n";

for (DOMNode *current = walker->nextNode();current!=0;current=walker->nextNode())        {

            loopXMLElement(current);        }

        std::cout<<std::endl;//创建一个迭代器去遍历结点        DOMNodeIterator* iterator = xmlDoc->createNodeIterator(pRoot,             DOMNodeFilter::SHOW_ELEMENT,  NULL, true);        std::cout<< "iterator遍历开始:\n";

for ( DOMNode * current = iterator->nextNode();            current != 0; current = iterator->nextNode() )        {string strName  = XMLString::transcode(current->getNodeName()); string strValue = XMLString::transcode((current->getFirstChild())->getNodeValue());            std::cout <<strName<<strValue<<endl;

        }

        std::cout<< std::endl;     }catch( xercesc::XMLException& excp )    {char* msg = xercesc::XMLString::transcode( excp.getMessage() );        ostringstream errBuf;        errBuf << "Error parsing file: " << msg << flush;        XMLString::release( &msg );    } 

}/**@brief 遍历DOM节点，采用递归算法，遍历该节点下的所有元素极其属性值（该方法主要是用于上面的parse方法的调用）

* @param 需要遍历的节点

* @return  0：表示遍历成功，1：表示失败

*/int ReadXml::loopXMLElement(DOMNode *node){//DOMNode * child;

if (node->getNodeType() == DOMNode::ELEMENT_NODE) {/*XMLString.transcode() 这个方法有多个重载，既可以把 XMLCh * 格式的数据转换成            char *的数据，也可以把 char * 的数据转换成 XMLCh *, 我们也可以利用这个函数来            初始化 XMLCh格式类型的数组，比如 XMLCh temp[100];            XMLString.transcode(“LS”,temp,99);            用“ LS ”初始化 temp 这个数组的内容。*/    //char * nodeName = XMLString::transcode(node->getNodeName());//获取该节点的名称,这里不需要，注释掉//std::string strName(nodeName);

//获取改节点的属性值,作为map中的value        char * nodeValue = XMLString::transcode((node->getFirstChild())->getNodeValue());        std::string strValue(nodeValue);

//如果该节点下有属性，则遍历其属性

if (node->hasAttributes())        {

            DOMNamedNodeMap *pAttributes = node->getAttributes();

const XMLSize_t nSize = pAttributes->getLength();

//遍历该节点下的所有属性

for (XMLSize_t i = 0; i < nSize; ++i)             {

                DOMAttr *pAttributeNode = (DOMAttr*) pAttributes->item(i);/*    属性的名字不需要                char *name = XMLString::transcode(pAttributeNode->getName());                std::string name_str = name;*/

//获取属性值,作为map中的key                char *attrValue = XMLString::transcode(pAttributeNode->getValue());string  attr_str = attrValue;

//将属性值存放到返回的对象中，此处自己构造对象填值                std::cout<<attrValue<<"="<<strValue<<std::endl;/*本map就是用来存储用户登录数据库信息形式如下:            hostname":192.168.131.202*/                dataMap[attrValue]=strValue;

                XMLString::release(&attrValue);//释放资源

            }

        }

        XMLString::release(&nodeValue);

    }

return 0;}int main(int argc ,char* argv[]){        ReadXml *xx = new ReadXml();string ss = "dbconfig.xml";//添加自己的配置文件。    xx->xmlParser(ss);return 0;}

<dbconfig><property name="hostname">192.168.131.202</property><property name="databasename">*****</property><property name="username">****</property><property name="password">****</property><property name="port">***</property></dbconfig>