C++中rapidjson将嵌套map转为嵌套json的讲解分享！

rapidjson将嵌套map转为嵌套json——人生苦短，我用rapidjson

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。

总结

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