c++实现Xml和json互转【转】
1、下载c语言的cJson库源码，库很小，只有两个文件cJSON.c和cJSON.h。下载地址：https://sourceforge.net/projects/cjson/
2、c++实现Xml和json互转
//#include "cmsDebug.h"
#include
#include
#include
#include
#include
#include
#include "cJSON.h"
using namespace std;
// 替换字符串
string& replace_all(string& str, const string& old_value, const string& new_value)
{
while(true)
{
string::size_type pos(0);
if((pos=str.find(old_value)) != string::npos)
str.replace(pos,old_value.length(),new_value);
else
break;
}
return str;
}
// 依赖cJSon，递归
/*
*/
string Xml2Json(string strXml)
{
string pNext = strXml;
cJSON * reJson = cJSON_CreateObject();
cJSON * jsonArray = cJSON_CreateArray();
string strArrayKey = "";
int nPos = 0;
while ((nPos = pNext.find("<")) >= 0)
{
// 获取第一个节点，如：
int nPosS = pNext.find("<");
int nPosE = pNext.find(">");
if (nPosS < 0 || nPosE < 0)
{
printf("head key error!(nPosS:%d, nPosE:%d)\n", nPosS, nPosE);
}
string strKey = pNext.substr(nPosS+1, nPosE-nPosS-1);
cJSON * jsonVal = NULL;
if ((nPos = strKey.find("=")) > 0)
{
jsonVal = cJSON_CreateObject();
int nPos = strKey.find(" ");
string temp = strKey.substr(nPos+1);
strKey = strKey.substr(0, nPos);
while((nPos = temp.find("=")) > 0)
{
int nPos1 = temp.find("=");
int nPos2 = temp.find("\" ", nPos1 + 1);
string strSubKey = temp.substr(0, nPos1);
string strSubVal = temp.substr(nPos1+1);
if (nPos2 > 0)
strSubVal = temp.substr(nPos1+1, nPos2-nPos1-1);
// 去除转义字符 \"
if ((int)(nPos = strSubVal.find("\"")) >= 0)
{
int nEnd = strSubVal.find("\\", nPos+1);
strSubVal = strSubVal.substr(nPos+1, nEnd-nPos-1);
if ((int)(nPos = strSubVal.find("\"")) >= 0)
{
strSubVal = strSubVal.substr(0, nPos);
}
}
cJSON_AddItemToObject(jsonVal, ("-" + strSubKey).c_str(), cJSON_CreateString(strSubVal.c_str()));
if (nPos2 < 0)
break;
temp = temp.substr(nPos2+2);
}
}
//尾标签""
int nPosKeyE = pNext.find("");
if (nPosKeyE < 0)
{
printf("strKey:%s\n", strKey.c_str());
printf("nPosKeyE error(%d)!\n", nPosKeyE);
printf("pNext:%s\n", pNext.c_str());
return "";
}
// 获取节点内容，如123 或 123
string strVal = pNext.substr(nPosE+1, nPosKeyE-nPosE-1);
if ((nPos = strVal.find("<")) >= 0)
{
// 包含子节点，如123
//递归调用
strVal = Xml2Json(strVal);
if (jsonVal)
{
if (strVal != "")
cJSON_AddItemToObject(jsonVal, "#text", cJSON_Parse(strVal.c_str()));
}
else
{
jsonVal = cJSON_Parse(strVal.c_str());
}
}
else
{
// 不包含子节点，如123
if (jsonVal)
{
if (strVal != "")
cJSON_AddItemToObject(jsonVal, "#text", cJSON_CreateString(strVal.c_str()));
}
else
{
jsonVal = cJSON_CreateString(strVal.c_str());
}
}
// 获取下一个节点
pNext = pNext.substr(nPosKeyE + strKey.size() + 3);
// 根据下一节点判断是否为数组
int nPosNext = pNext.find("<");
int nPosNextSame = pNext.find("<" + strKey + ">");
if (strArrayKey != "" || (nPosNext>=0 && nPosNextSame>=0 && nPosNext==nPosNextSame))
{
// 数组
cJSON_AddItemToArray(jsonArray, jsonVal);
strArrayKey = strKey;
}
else
{
// 非数组
cJSON_AddItemToObject(reJson, strKey.c_str(), jsonVal);
}
}
if (strArrayKey != "")
{
cJSON_AddItemToObject(reJson, strArrayKey.c_str(), jsonArray);
}
string strJson = cJSON_Print(reJson);
if(reJson)
{
cJSON_Delete(reJson);
reJson = NULL;
}
return strJson;
}
// 依赖cJSon，递归
/*
{"doc": {"a": {"-a1": "1","-a2": "2","#text": "123"}}} 转
*/
string Json2Xml(string strJson)
{
string strXml = "";
cJSON *root = cJSON_Parse(strJson.c_str());
if (!root)
{
printf("strJson error!");
return "";
}
cJSON *pNext = root->child;
if (!pNext)
{
return strJson;
}
int nPos = 0;
while (pNext)
{
string strChild = cJSON_Print(pNext);
string strVal = Json2Xml(strChild);
if (pNext->string != NULL)
{
string strKey = pNext->string;
if ((nPos=strKey.find("-")) == 0)
{
// 属性项
strXml.append(" ");
strXml.append(strKey.substr(1));
strXml.append("=");
strXml.append(strVal);
if (pNext->next == NULL)
strXml.append(">");
}
else if ((nPos=strKey.find("#")) == 0)
{
// 值
strXml.append(">");
strXml.append(strVal);
}
else if ((int)(strVal.find("=")) > 0 /*&& (int)(strVal.find("<")) < 0*/)
{
// 包含属性项的键值对
strXml.append("<" + strKey);
strXml.append(strVal);
strXml.append("");
}
else
{
// 修正底层无键的值数组的键，如：把
if ((int)strVal.find("JUAN_XJ_preKey") >= 0)
{
replace_all(strVal, "JUAN_XJ_preKey", strKey);
strXml.append(strVal);
}
else
{
strXml.append("<" + strKey + ">");
strXml.append(strVal);
strXml.append("");
}
}
}
else
{
// 不包含键的值数组， 如：["123", "456"]，暂时转为
string strPreKey = "JUAN_XJ_preKey";
strXml.append("<" + strPreKey + ">");
strXml.append(strVal);
strXml.append("");
}
pNext = pNext->next;
}
return strXml;
}
int main (int argc, const char * argv[])
{
/*
*/
//string strXml = "
//string strXml = "
string strXml = "
printf("strXml:%s\n", strXml.c_str());
string strJson = Xml2Json(strXml);
printf("strJson:%s\n", strJson.c_str());
/*
{"doc": {"a": {"-a1": "1","-a2": "2","#text": "123"}}} 转
*/
//string stringJson = "{\"doc\": {\"a\": {\"-a1\": \"1\",\"-a2\": \"2\",\"#text\": \"123\"}}}";
string stringJson = "{\"create_task_v\": {\"name\": \"0170322174646\",\"id\": \"ff8080815af054de015af56977390013\",\"target\": {\"name\": \"776782979\",\"hosts\": \"192.168.28.23\",\"exclude_hosts\": \"ddd\"}}}";
string stringXml = Json2Xml(stringJson);
printf("stringXml:%s\n", stringXml.c_str());
return 0;
}