看程式碼：

#include <iostream>
#include <map>

// 請自己下載開源的rapidjson
#include "rapidjson/prettywriter.h"
#include "rapidjson/rapidjson.h"
#include "rapidjson/document.h"
#include "rapidjson/stringbuffer.h"
#include "rapidjson/writer.h"
#include "rapidjson/memorystream.h"

using namespace std;
using rapidjson::Document;
using rapidjson::StringBuffer;
using rapidjson::Writer;
using namespace rapidjson;


string formJson(const map<string, int> &mInt, const map<string, string> &mString,
		        const string &strChild, const map<string, int> &mChildInt, const map<string, string> &mChildString)
{
	Document document;

    Document::AllocatorType& allocator = document.GetAllocator(); 
    Value root(kObjectType);
	Value child(kObjectType);

    Value key(kStringType);  
    Value value(kStringType); 

	// 當前級別
	for(map<string, int>::const_iterator it = mInt.begin(); it != mInt.end(); ++it) 
	{
		key.SetString(it->first.c_str(), allocator);  
    	root.AddMember(key, it->second, allocator);
	}

	for(map<string, string>::const_iterator it = mString.begin(); it != mString.end(); ++it)
	{
		key.SetString(it->first.c_str(), allocator);  
   		value.SetString(it->second.c_str(), allocator);  
    	root.AddMember(key, value, allocator);
	}


	// 孩子級別
	if(!strChild.empty())
	{
		for(map<string, int>::const_iterator it = mChildInt.begin(); it != mChildInt.end(); ++it) 
		{
			key.SetString(it->first.c_str(), allocator);  
	    	child.AddMember(key, it->second, allocator);
		}

		for(map<string, string>::const_iterator it = mChildString.begin(); it != mChildString.end(); ++it)
		{
			key.SetString(it->first.c_str(), allocator);  
	   		value.SetString(it->second.c_str(), allocator);  
	    	child.AddMember(key, value, allocator);
		}

		key.SetString(strChild.c_str(), allocator); 
		root.AddMember(key, child, allocator);
	}


    StringBuffer buffer;  
    Writer<StringBuffer> writer(buffer);  
    root.Accept(writer);  
    return buffer.GetString();  

}


int main(int argc, char *argv[])
{
	map<string, int> mInt;
	mInt["code"] = 0;
	mInt["score"] = 80;

	map<string, string> mString;
	mString["name"] = "taoge";
	mString["place"] = "shenzhen";


	string strChild = "childNode";

	map<string, int> mChildInt;
	mChildInt["code"] = 0;
	mChildInt["score"] = 100;

	map<string, string> mChildString;
	mChildString["name"] = "taogeChild";
	mChildString["place"] = "shenzhen";

	
	string strJson = formJson(mInt, mString, 
		                      strChild, mChildInt, mChildString);
	cout << strJson << endl;
	return 0;
}
 

{"code":0,"score":80,"name":"taoge","place":"shenzhen","childNode":{"code":0,"score":100,"name":"taogeChild","place":"shenzhen"}}

       另外， 如果僅僅想有當前界別， 那麼， 可以這麼搞（C++預設引數搞起）：

#include <iostream>
#include <map>

// 請自己下載開源的rapidjson
#include "rapidjson/prettywriter.h"
#include "rapidjson/rapidjson.h"
#include "rapidjson/document.h"
#include "rapidjson/stringbuffer.h"
#include "rapidjson/writer.h"
#include "rapidjson/memorystream.h"

using namespace std;
using rapidjson::Document;
using rapidjson::StringBuffer;
using rapidjson::Writer;
using namespace rapidjson;


map<string, int> g_mChildInt;
map<string, string> g_mChildString;


string formJson(const map<string, int> &mInt, const map<string, string> &mString,
		        const string &strChild="", const map<string, int> &mChildInt=g_mChildInt, const map<string, string> &mChildString=g_mChildString)
{
	Document document;

    Document::AllocatorType& allocator = document.GetAllocator(); 
    Value root(kObjectType);
	Value child(kObjectType);

    Value key(kStringType);  
    Value value(kStringType); 

	// 當前級別
	for(map<string, int>::const_iterator it = mInt.begin(); it != mInt.end(); ++it) 
	{
		key.SetString(it->first.c_str(), allocator);  
    	root.AddMember(key, it->second, allocator);
	}

	for(map<string, string>::const_iterator it = mString.begin(); it != mString.end(); ++it)
	{
		key.SetString(it->first.c_str(), allocator);  
   		value.SetString(it->second.c_str(), allocator);  
    	root.AddMember(key, value, allocator);
	}


	// 孩子級別
	if(!strChild.empty())
	{
		for(map<string, int>::const_iterator it = mChildInt.begin(); it != mChildInt.end(); ++it) 
		{
			key.SetString(it->first.c_str(), allocator);  
	    	child.AddMember(key, it->second, allocator);
		}

		for(map<string, string>::const_iterator it = mChildString.begin(); it != mChildString.end(); ++it)
		{
			key.SetString(it->first.c_str(), allocator);  
	   		value.SetString(it->second.c_str(), allocator);  
	    	child.AddMember(key, value, allocator);
		}

		key.SetString(strChild.c_str(), allocator); 
		root.AddMember(key, child, allocator);
	}


    StringBuffer buffer;  
    Writer<StringBuffer> writer(buffer);  
    root.Accept(writer);  
    return buffer.GetString();  

}


int main(int argc, char *argv[])
{
	map<string, int> mInt;
	mInt["code"] = 0;
	mInt["score"] = 80;

	map<string, string> mString;
	mString["name"] = "taoge";
	mString["place"] = "shenzhen";

	
	string strJson = formJson(mInt, mString);
	cout << strJson << endl;
	return 0;
}
 

{"code":0,"score":80,"name":"taoge","place":"shenzhen"}

       其實， 上面的formJson函式， 還可以繼續擴充套件。