C++中rapidjson将嵌套map转为嵌套json的讲解
2019-04-11 09:17
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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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