本文主要是介绍rapidjson将嵌套map转为嵌套json------人生苦短，我用rapidjson，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
看代码：
#include <iostream>
#include <map>// 请自己下载开源的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); // 当前级别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);}// 孩子级别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;
}
结果：
{"code":0,"score":80,"name":"taoge","place":"shenzhen","childNode":{"code":0,"score":100,"name":"taogeChild","place":"shenzhen"}}
另外， 如果仅仅想有当前界别， 那么， 可以这么搞（C++默认参数搞起）：
#include <iostream>
#include <map>// 请自己下载开源的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); // 当前级别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);}// 孩子级别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;
}
结果：
{"code":0,"score":80,"name":"taoge","place":"shenzhen"}
其实， 上面的formJson函数， 还可以继续扩展。
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