c++实现Xml和json互转【转】

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我是靠谱客的博主眯眯眼八宝粥，最近开发中收集的这篇文章主要介绍c++实现Xml和json互转【转】，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

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 <stdlib.h>

#include <string.h>

#include <stdio.h>

#include <assert.h>

#include <time.h>

#include <iostream>

#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

<doc><a a1="1" a2="2">123</a></doc> 转 {"doc": {"a": {"-a1": "1","-a2": "2","#text": "123"}}}

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：<doc><a a1="1" a2="2">123</a></doc>

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);

// 解释属性，如：<a a1="1" a2="2">

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"</strKey>"
int nPosKeyE = pNext.find("</" + strKey + ">");

if (nPosKeyE < 0)

{
printf("strKey:%sn", strKey.c_str());
printf("nPosKeyE error(%d)!n", nPosKeyE);
printf("pNext:%sn", pNext.c_str());
return "";
}

// 获取节点内容，如<a a1="1" a2="2">123</a> 或 123

string strVal = pNext.substr(nPosE+1, nPosKeyE-nPosE-1);

if ((nPos = strVal.find("<")) >= 0)

{

// 包含子节点，如<a a1="1" a2="2">123</a>
//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 <doc><a a1="1" a2="2">123</a></doc>

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("</" + strKey + ">");

}

else

{

// 修正底层无键的值数组的键，如：把<JUAN_XJ_preKey>123</JUAN_XJ_preKey>中的JUAN_XJ_preKey修正

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("</" + strKey + ">");

}

else

{

// 不包含键的值数组，如：["123", "456"]，暂时转为<JUAN_XJ_preKey>123</JUAN_XJ_preKey>

string strPreKey = "JUAN_XJ_preKey";

strXml.append("<" + strPreKey + ">");

strXml.append(strVal);

strXml.append("</" + strPreKey + ">");

}

pNext = pNext->next;

}

return strXml;

}

int main (int argc, const char * argv[])
{
/*
<doc><a a1="1" a2="2">123</a></doc> 转 {"doc": {"a": {"-a1": "1","-a2": "2","#text": "123"}}}

*/
   //string strXml = "<create_task_v id="ff80808166a666da0166cd48a5057a68" name="漏洞扫描_2018111111917"><forbid_interval></forbid_interval><target><name>-33033135</name><hosts>192.168.28.13</hosts><exclude_hosts></exclude_hosts></target><preferences><preference><scanner_name>task_priority</scanner_name><value>1</value></preference></preferences></create_task_v>";
   //string strXml = "<doc><a a1="1" a2="2">123</a></doc>";
   string strXml = "<create_task_v id="ff80808166a666da0166cd48a5057a68" name="漏洞扫描_2018111111917"><forbid_interval></forbid_interval><target><name>-33033135</name><hosts>192.168.28.13</hosts><exclude_hosts></exclude_hosts></target><preferences><preference><scanner_name>task_priority</scanner_name><value>1</value></preference><preference><scanner_name>guess_time</scanner_name><value>1200</value></preference><preference><scanner_name>max_hosts</scanner_name><value>100</value></preference><preference><scanner_name>max_checks</scanner_name><value></value></preference><preference><scanner_name>scan_span</scanner_name><value></value></preference><preference><scanner_name>scan_mode_os</scanner_name><value>yes</value></preference><preference><scanner_name>scan_notify</scanner_name><value>no</value></preference><preference><scanner_name>scan_notify_text</scanner_name><value></value></preference><preference><scanner_name>Services[entry]:Network read/write timeout :</scanner_name><value>1</value></preference><preference><scanner_name>Services[entry]:Network connection timeout :</scanner_name><value>2</value></preference><preference><scanner_name>Services[entry]:Network read/write timeout :</scanner_name><value>2</value></preference><preference><scanner_name>scan_mode_domain</scanner_name><value>no</value></preference><preference><scanner_name>plugins_timeout</scanner_name><value>40</value></preference><preference><scanner_name>scan_scanAfterNetConn</scanner_name><value>0</value></preference><preference><scanner_name>dependable</scanner_name><value>0</value></preference></preferences><source_iface></source_iface><host_live><mode>1</mode><port_range></port_range></host_live><port_scan><mode>1</mode><mode_inuse>0</mode_inuse><method>5</method><isr>1</isr><udp_scan>0</udp_scan><port_range_inuse>1</port_range_inuse><port_range>1-65535</port_range></port_scan><policy_id>4028fe023121e14a013146c535dd6cc7</policy_id><oid_list>8800103;103997;900239</oid_list><common_param><param><type>PARAM_TYPE_CGI</type><name>cgi_useproxyserver_addr</name><value></value></param><param><type>PARAM_TYPE_CGI</type><name>cgi_enableproxyserver</name><value>0</value></param><param><type>PARAM_TYPE_CGI</type><name>cgi_cgipath</name><value>/cgi-bin</value></param><param><type>PARAM_TYPE_CGI</type><name>cgi_httpport</name><value>80,8080,8888</value></param><param><type>PARAM_TYPE_CGI</type><name>cgi_enableusehead</name><value>false</value></param><param><type>PARAM_TYPE_CGI</type><name>cgi_enableuseget</name><value>true</value></param><param><type>PARAM_TYPE_CGI</type><name>cgi_useproxyserver_port</name><value>8000</value></param><param><type>PARAM_TYPE_BACKDOOR</type><name>backdoor_userporttable</name><value>20034,21554,6776,27374,1243,5780,5880,8011,12349,23432,7511,5418,5277,54320,31337,54321</value></param><param><type>PARAM_TYPE_BACKDOOR</type><name>backdoor_enableuserporttable</name><value>true</value></param><param><type>PARAM_TYPE_BACKDOOR</type><name>backdoor_enableapplyportscanresult</name><value>false</value></param></common_param><databaseset><param><type>PARAM_TYPE_DB2</type><name>db2_username</name><value>db2admin</value></param><param><type>PARAM_TYPE_DB2</type><name>db2_password</name><value>test1234</value></param><param><type>PARAM_TYPE_DB2</type><name>db2_port</name><value>50000</value></param><param><type>PARAM_TYPE_DB2</type><name>db2_DBname</name><value>DWCTRLDB</value></param><param><type>PARAM_TYPE_ORACLE</type><name>oracle_username</name><value>sys</value></param><param><type>PARAM_TYPE_ORACLE</type><name>oracle_password</name><value>manager</value></param><param><type>PARAM_TYPE_ORACLE</type><name>oracle_port</name><value>1521</value></param><param><type>PARAM_TYPE_ORACLE</type><name>oracle_DBname</name><value>orcl</value></param><param><type>PARAM_TYPE_SYBASE</type><name>sybase_username</name><value>sa</value></param><param><type>PARAM_TYPE_SYBASE</type><name>sybase_password</name><value>test1234</value></param><param><type>PARAM_TYPE_SYBASE</type><name>sybase_port</name><value>5000</value></param><param><type>PARAM_TYPE_SYBASE</type><name>sybase_DBname</name><value>master</value></param><param><type>PARAM_TYPE_MSSQL</type><name>mssql_username</name><value>sa</value></param><param><type>PARAM_TYPE_MSSQL</type><name>mssql_password</name><value>test1234</value></param><param><type>PARAM_TYPE_MSSQL</type><name>mssql_port</name><value>1433</value></param><param><type>PARAM_TYPE_MYSQL</type><name>mysql_username</name><value>root</value></param><param><type>PARAM_TYPE_MYSQL</type><name>mysql_password</name><value>test1234</value></param><param><type>PARAM_TYPE_MYSQL</type><name>mysql_port</name><value>3306</value></param><param><type>PARAM_TYPE_MYSQL</type><name>mysql_DBname</name><value>mysql</value></param></databaseset><passwordguess></passwordguess></create_task_v>";

   printf("strXml:%sn", strXml.c_str());
   string strJson = Xml2Json(strXml);
   printf("strJson:%sn", strJson.c_str());

   /*

{"doc": {"a": {"-a1": "1","-a2": "2","#text": "123"}}} 转 <doc><a a1="1" a2="2">123</a></doc>

*/
   //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:%sn", stringXml.c_str());
   return 0;
}