C++中rapidjson将map转为json的方法

2020-01-26 13:29:15

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rapidjson将map转为json------人生苦短，我用rapidjson

直接撸代码：

#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 test(const map<string, string> &m)  // 注意这里的const{  Document document;   Document::AllocatorType& allocator = document.GetAllocator();   Value root(kObjectType);   Value key(kStringType);   Value value(kStringType);  for(map<string, string>::const_iterator it = m.begin(); it != m.end(); ++it) // 注意这里要用const_iterator { key.SetString(it->first.c_str(), allocator);    value.SetString(it->second.c_str(), allocator);    root.AddMember(key, value, allocator); }  StringBuffer buffer;   Writer<StringBuffer> writer(buffer);   root.Accept(writer);   return buffer.GetString(); } int main(int argc, char *argv[]){ map<string, string> m; m["name"] = "taoge"; m["place"] = "shenzhen"; cout << test(m) << endl; return 0;}

结果：

{"name":"taoge","place":"shenzhen"}

来，继续改：

#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 test(const map<string, int> &mInt, const map<string, string> &mString)  // 注意这里的const{  Document document;   Document::AllocatorType& allocator = document.GetAllocator();   Value root(kObjectType);   Value key(kStringType);   Value value(kStringType);  for(map<string, int>::const_iterator it = mInt.begin(); it != mInt.end(); ++it) // 注意这里要用const_iterator { 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) // 注意这里要用const_iterator { key.SetString(it->first.c_str(), allocator);    value.SetString(it->second.c_str(), allocator);    root.AddMember(key, value, allocator); }  StringBuffer buffer;   Writer<StringBuffer> writer(buffer);   root.Accept(writer);   return buffer.GetString(); } int main(int argc, char *argv[]){ map<string, int> mInt; mInt["age"] = 29; mInt["score"] = 80; map<string, string> mString; mString["name"] = "taoge"; mString["place"] = "shenzhen"; cout << test(mInt, mString) << endl; return 0;}

结果：