C++中rapidjson将嵌套map转为嵌套json的讲解

2023-08-24 21:52:05 224
rapidjson将嵌套map转为嵌套json------人生苦短，我用rapidjson
看代码：
#include
#include
//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"
usingnamespacestd;
usingrapidjson::Document;
usingrapidjson::StringBuffer;
usingrapidjson::Writer;
usingnamespacerapidjson;
stringformJson(constmap&mInt,constmap&mString,
conststring&strChild,constmap&mChildInt,constmap&mChildString)
{
Documentdocument;
Document::AllocatorType&allocator=document.GetAllocator();
Valueroot(kObjectType);
Valuechild(kObjectType);
Valuekey(kStringType);
Valuevalue(kStringType);
//当前级别
for(map::const_iteratorit=mInt.begin();it!=mInt.end();++it)
{
key.SetString(it->first.c_str(),allocator);
root.AddMember(key,it->second,allocator);
}
for(map::const_iteratorit=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::const_iteratorit=mChildInt.begin();it!=mChildInt.end();++it)
{
key.SetString(it->first.c_str(),allocator);
child.AddMember(key,it->second,allocator);
}
for(map::const_iteratorit=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);
}
StringBufferbuffer;
Writerwriter(buffer);
root.Accept(writer);
returnbuffer.GetString();
}
intmain(intargc,char*argv[])
{
mapmInt;
mInt["code"]=0;
mInt["score"]=80;
mapmString;
mString["name"]="taoge";
mString["place"]="shenzhen";
stringstrChild="childNode";
mapmChildInt;
mChildInt["code"]=0;
mChildInt["score"]=100;
mapmChildString;
mChildString["name"]="taogeChild";
mChildString["place"]="shenzhen";
stringstrJson=formJson(mInt,mString,
strChild,mChildInt,mChildString);
cout<
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
#include
//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"
usingnamespacestd;
usingrapidjson::Document;
usingrapidjson::StringBuffer;
usingrapidjson::Writer;
usingnamespacerapidjson;
mapg_mChildInt;
mapg_mChildString;
stringformJson(constmap&mInt,constmap&mString,
conststring&strChild="",constmap&mChildInt=g_mChildInt,constmap&mChildString=g_mChildString)
{
Documentdocument;
Document::AllocatorType&allocator=document.GetAllocator();
Valueroot(kObjectType);
Valuechild(kObjectType);
Valuekey(kStringType);
Valuevalue(kStringType);
//当前级别
for(map::const_iteratorit=mInt.begin();it!=mInt.end();++it)
{
key.SetString(it->first.c_str(),allocator);
root.AddMember(key,it->second,allocator);
}
for(map::const_iteratorit=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::const_iteratorit=mChildInt.begin();it!=mChildInt.end();++it)
{
key.SetString(it->first.c_str(),allocator);
child.AddMember(key,it->second,allocator);
}
for(map::const_iteratorit=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);
}
StringBufferbuffer;
Writerwriter(buffer);
root.Accept(writer);
returnbuffer.GetString();
}
intmain(intargc,char*argv[])
{
mapmInt;
mInt["code"]=0;
mInt["score"]=80;
mapmString;
mString["name"]="taoge";
mString["place"]="shenzhen";
stringstrJson=formJson(mInt,mString);
cout<
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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C++中rapidjson将嵌套map转为嵌套json的讲解

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