C++中rapidjson将嵌套map转为嵌套json的讲解
作者：stpeace
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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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