封装使用jsoncpp的类
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封装使用jsoncpp的类包括5种功能
1.是否存在节点
bool IsNodeExisted(string jsonObj, string strNode);
2.为数组增加元素
int AppendArrayObject(string& jsonObj, string strNode, string strValue);
3.获取节点值
int GetJsonValue(string jsonObj,string strNode,string& strOut);
4.设置节点值
int SetJsonObejct(string& jsonObj, string strNode, string strValue);
5.获取对象节点列表
int GetJsonChildNodeArray(string jsonObj, string strNode,vector<string>& vecChildNode);
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JsonBase.h
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#pragma once#include "json/reader.h"#include <sstream>#include <algorithm>using namespace std;#pragma comment(lib,"json/json_vc71_libmtd.lib")class JsonBase{public: JsonBase(void); ~JsonBase(void);public: bool IsNodeExisted(string jsonObj, string strNode); int AppendArrayObject(string& jsonObj, string strNode, string strValue); int GetJsonValue(string jsonObj,string strNode,string& strOut); int GetJsonChildNodeArray(string jsonObj, string strNode,vector<string>& vecChildNode); int SetJsonObejct(string& jsonObj, string strNode, string strValue);private: bool ReadJson(string jObect, Json::Value& root); bool GetJsonObject(Json::Value &jsonObj, string strValue);};**************************************************************************************************
JsonBase.cpp
**************************************************************************************************
#include "JsonBase.h"#include "json/reader.h"#include <sstream>#include <algorithm>using namespace std;enum ReturnType{ RET_ERROR = -1, RET_OK};//声明void ConvertStr(string& str);void TrimQuotationMarks(string& str);void RemoveSpaceAndLineFeed(string& strSource);bool ContainObject(string strValue, Json::Value &jsonObj);string ReturnJsonIndexString(Json::Value jObejct, string strValue);string& replace_all(string& str,const string& old_value,char new_value);vector<string> SplitObject(string strNode);vector<string> GetChildNodList(Json::Value jObejct, string strValue);vector<string> split(const string& src, string delimit,string null_subst);vector<string> split(const string& src, string delimit,string null_subst="") { typedef basic_string<char>::size_type S_T; static const S_T npos = -1; if( src.empty() || delimit.empty() ) throw "split: empty string\0"; vector<string> v; S_T deli_len = delimit.size(); unsigned int index = npos, last_search_position = 0; while( (index=src.find(delimit, last_search_position))!=npos ) { if(index==last_search_position) v.push_back(null_subst); else v.push_back( src.substr(last_search_position, index-last_search_position) ); last_search_position = index + deli_len; } string last_one = src.substr(last_search_position); v.push_back( last_one.empty()? null_subst:last_one ); return v; }vector<string> SplitObject(string strNode){ vector<string> vecRet; for (size_t i=0; i<strNode.size(); i++) { if (strNode[i] == '.') { vecRet.push_back(strNode.substr(0, i)); } else if (strNode[i] == '[') { string strTemp = strNode.substr(0,i); if (strTemp != "") { vecRet.push_back(strTemp); } } } if (strNode != "") { vecRet.push_back(strNode); } return vecRet;}vector<string> GetChildNodList(Json::Value jObejct, string strValue){ //查找该节点 vector<string> vecArray = split(strValue,"."); bool bFlag = true; Json::Value jsonObj = jObejct; for (size_t i=0; i<vecArray.size(); i++) { if (!jsonObj.isMember(vecArray[i])) { bFlag = false; break; } if (i<vecArray.size()) { jsonObj = jsonObj.get(vecArray[i],NULL); } } Json::Value jsonChildNode= jsonObj[vecArray[vecArray.size()-1]]; return jsonChildNode.getMemberNames();}bool JsonBase::ReadJson(string jObect, Json::Value& root){ Json::Reader jsonReader; if (!jsonReader.parse(jObect, root)) { cout<<"解析Json数据结构失败!\n"; return false; } return true;}void RemoveSpaceAndLineFeed(string& strSource){ string strRet; for (size_t i=0; i< strSource.size(); i++) { if (strSource[i] != ' ' && strSource[i] != '\n') { strRet += strSource[i]; } } strSource = strRet;}bool JsonBase::GetJsonObject(Json::Value &jsonObj, string strValue) { if (strValue == "") { return true; } vector<string> vecArray = split(strValue,"."); for (size_t i=0; i<vecArray.size(); i++) { string strKey = vecArray[i]; int nStart = strKey.find('['); int nEnd = strKey.find(']'); if (-1 != nStart && -1 != nEnd) { size_t nPos = -1; sscanf(strKey.substr(nStart+1,nEnd-nStart-1).c_str(),"%d", &nPos); string strTempKey = ""; if (nStart != 0) { strTempKey = strKey.substr(0,nStart); } if (strTempKey != "") { if (jsonObj.type() != Json::objectValue) { cout<<"当前节点不是对象!\n"; return false; } if (!jsonObj.isMember(strTempKey)) { cout<<"节点不存在!\n"; return false; } if (i<vecArray.size()) { jsonObj = jsonObj.get(strTempKey,NULL); } } do { Json::ValueType valueType = jsonObj.type(); if (valueType == Json::arrayValue) { if (nPos < 0) { int nSize = jsonObj.size(); //负数下标不能超过size大小 if (nPos*(-1) > nSize) { cout<<"节点下标越界!\n"; return false; } nPos = nPos % nSize; if (nPos != 0) { nPos += nSize; } } else if (nPos > jsonObj.size()-1) { cout<<"节点下标越界!\n"; return false; } jsonObj = jsonObj.get(nPos,NULL); } else { cout<<"节点不是数组!\n"; return false; } strKey = strKey.substr(nEnd+1); nStart = strKey.find('['); nEnd = strKey.find(']'); sscanf(strKey.substr(nStart+1,nEnd-nStart-1).c_str(),"%d", &nPos); } while (-1 != nStart && -1 != nEnd); } else { if (jsonObj.type() != Json::objectValue) { cout<<"节点不是数组!\n"; return false; } if (!jsonObj.isMember(strKey)) { cout<<"节点不存在!\n"; return false; } if (i<vecArray.size()) { jsonObj = jsonObj.get(strKey,NULL); } } } return true;}JsonBase::JsonBase(void){}JsonBase::~JsonBase(void){}int JsonBase::SetJsonObejct(string& jsonObj, string sNode, string strValue){ Json::Value root; if (!ReadJson(jsonObj, root)) { return RET_ERROR; } string strPreNode; //前一个节点 string strNode; //当前节点 Json::Value obj = root; //当前节点对象 //需先将值转化为对象 Json::Reader jsonReader; Json::Value newObject; jsonReader.parse(strValue, newObject); //判断输入，字符串必须以引号括起来 string strVal = strValue; int nStart = strVal.find('\"'); int nEnd = strVal.find_last_of('\"'); if (newObject.type() == Json::stringValue || newObject.type() == Json::nullValue) { if (!(0 == nStart && strVal.size()-1 == nEnd)) { cout<<"值参数输入错误!\n"; return RET_ERROR; } else { TrimQuotationMarks(strVal); } } string strKey = sNode; vector<string> vecObject = SplitObject(strKey); obj = newObject; if (newObject.type() == Json::stringValue || newObject.type() == Json::nullValue) { obj = strVal; } for (size_t i=vecObject.size()-1; i>=0; i--) { //节点为空，代表改root if (vecObject.size() == 0) { if (newObject.type() == Json::stringValue || newObject.type() == Json::nullValue) { root = strVal; } else { root = newObject; } obj = root; break; } strNode = vecObject[i]; //最后一条 if (i == 0) { int nStart = strNode.find('['); int nEnd = strNode.find(']'); if (-1 != nStart && -1 != nEnd) { int nPos = -1; sscanf(strNode.substr(nStart+1,nEnd-nStart-1).c_str(),"%d", &nPos); if (!root.isArray()) { return RET_ERROR; } if (nPos < 0) { int nSize = root.size(); //负数下标不能超过size大小 if (nPos*(-1) > nSize) { cout<<"节点下标越界!\n"; return RET_ERROR; } nPos = nPos % nSize; if (nPos != 0) { nPos += nSize; } } else if (nPos > root.size()-1) { cout<<"节点下标越界!\n"; return RET_ERROR; } if (obj.type() == Json::stringValue || obj.type() == Json::nullValue) { root[nPos] = strVal; } else { root[nPos] = obj; } } else { if (root.type() != Json::objectValue) { cout<<"当前节点不是对象!\n"; return RET_ERROR; } if (obj.type() == Json::stringValue || obj.type() == Json::nullValue) { root[strNode] = strVal; } else { root[strNode] = obj; } } obj = root; break; } strPreNode = vecObject[i-1]; Json::Value tempObject = root; if (!GetJsonObject(tempObject, strPreNode)) { cout<<"节点不存在!\n"; return RET_ERROR; } //获取Key if (strNode.substr(strPreNode.size(),1) == ".") { strKey = strNode.substr(strPreNode.size()+1); } else { strKey = strNode.substr(strPreNode.size()); } //key为数组下标 int nStart = strKey.find('['); int nEnd = strKey.find(']'); if (-1 != nStart && -1 != nEnd) { int nPos = -1; sscanf(strKey.substr(nStart+1,nEnd-nStart-1).c_str(),"%d", &nPos); if (!tempObject.isArray()) { cout<<"节点不是数组!\n"; return RET_ERROR; } if (nPos < 0) { int nSize = tempObject.size(); //负数下标不能超过size大小 if (nPos*(-1) > nSize) { cout<<"节点下标越界!\n"; return RET_ERROR; } nPos = nPos % nSize; if (nPos != 0) { nPos += nSize; } } else if (nPos >tempObject.size()-1) { cout<<"节点下标越界!\n"; return RET_ERROR; } tempObject[nPos] = obj; } else { tempObject[strKey] = obj; } obj = tempObject; } root = obj; jsonObj = root.toStyledString(); return RET_OK;}string ReturnJsonIndexString(Json::Value jObejct, string strValue){ string strKey = strValue; int nStart = strKey.find('['); int nEnd = strKey.find(']'); if (-1 != nStart && -1 != nEnd) { int nPos = -1; sscanf(strKey.substr(nStart+1,nEnd-nStart-1).c_str(),"%d", &nPos); if (nPos < 0) { cout<<"数组下标不正确!\n"; return ""; } string strTempKey = strKey.substr(0,nStart); vector<string> retVec = GetChildNodList(jObejct,strTempKey); cout<<"members.size()="<<retVec.size()<<endl; for (size_t k=0; k<retVec.size(); k++) { cout<<"members["<<k<<"]="<<retVec[k]<<endl; } string strIndex = retVec[nPos]; string strRet = strKey.substr(0,nStart) + "." + strIndex + strKey.substr(nEnd+1); strValue = strRet; return ReturnJsonIndexString(jObejct, strValue); } else { return strValue; }}string& replace_all(string& str,const string& old_value,char new_value) { while(true) { string::size_type pos(0); if( (pos=str.find(old_value))!=string::npos ) { string strTemp; strTemp += str.substr(0,pos); strTemp += new_value; strTemp += str.substr(pos+old_value.size()); str = strTemp; } else break; } return str; } void TrimQuotationMarks(string& str){ if (0 == str.find('\"')) { str = str.substr(1); } if ( str.size()-1 == str.find_last_of('\"')) { str = str.substr(0,str.size()-1); }}void ConvertStr(string& str){ string strVal = str; strVal = replace_all(strVal,"\\b",'\b'); strVal = replace_all(strVal,"\\f",'\f'); strVal = replace_all(strVal,"\\n",'\n'); strVal = replace_all(strVal,"\\r",'\r'); strVal = replace_all(strVal,"\\t",'\t'); strVal = replace_all(strVal,"\\\"",'\"'); strVal = replace_all(strVal,"\\\'",'\''); strVal = replace_all(strVal,"\\\\",'\\'); str = strVal;}int JsonBase::GetJsonValue(string jsonObj,string strNode,string& strOut){ Json::Value root; if (!ReadJson(jsonObj, root)) { return RET_ERROR; } bool bFlag = true; Json::Value jObject = root; if (strNode != "") { bFlag = GetJsonObject(jObject, strNode); } string strRet = ""; if (!bFlag) { strOut = strRet; return RET_ERROR; } else { strRet = jObject.toStyledString(); strRet = strRet.substr(0,strRet.size()-1); if (jObject.type() != Json::objectValue) { ConvertStr(strRet); TrimQuotationMarks(strRet); } strOut = strRet; return jObject.type(); } return RET_OK;}int JsonBase::GetJsonChildNodeArray(string jObject, string strNode,vector<string>& vecChildNode){ Json::Value root; if (!ReadJson(jObject, root)) { return RET_ERROR; } Json::Value jsonObj = root; //查找该节点 if (!GetJsonObject(jsonObj, strNode)) { cout<<"节点不存在!\n"; return RET_ERROR; } string strRet,strTemp; //清空返回值内容 if (!vecChildNode.empty()) { vecChildNode.clear(); } if (jsonObj.type() == Json::objectValue) { Json::Value::Members members = jsonObj.getMemberNames(); Json::Value::Members::iterator it = members.begin(); while (it != members.end()) { strTemp = *it; strTemp = strTemp.substr(0,strTemp.size()); vecChildNode.push_back(strTemp); it++; } } else if (jsonObj.type() == Json::arrayValue) { for (size_t i=0; i<jsonObj.size(); i++) { strTemp = jsonObj[i].toStyledString(); strTemp = strTemp.substr(0,strTemp.size()-1); if (jsonObj[i].type() != Json::objectValue) { ConvertStr(strTemp); TrimQuotationMarks(strTemp); } vecChildNode.push_back(strTemp); } } else { return RET_ERROR; } return RET_OK;}bool ContainObject(string strValue, Json::Value &jsonObj){ if (!jsonObj.isMember(strValue)) { return false; } jsonObj = jsonObj[strValue]; return true;}bool JsonBase::IsNodeExisted(string jObject, string strNode){ Json::Value root; if (!ReadJson(jObject, root)) { return false; } string strValue =strNode; if (strValue == "") { cout<<"输入字符串为空!\n"; return false; } vector<string> vecArray = SplitObject(strValue,"."); for (size_t i=0; i<vecArray.size(); i++) { Json::Value jsonObj = root; if (!GetJsonObject(jsonObj, vecArray[i])) { return false; } } return true;}int JsonBase::AppendArrayObject(string& jsonObj, string sNode, string strValue){ Json::Value root; if (!ReadJson(jsonObj,root)) { return RET_ERROR; } string strPreNode; //前一个节点 string strNode; //当前节点 Json::Value obj = root; //当前节点对象 //需先将值转化为对象 Json::Reader jsonReader; Json::Value newObject; jsonReader.parse(strValue, newObject); string strKey = sNode; vector<string> vecObject; //append root节点 if (strKey == "") { if (!root.isArray()) { cout<<"节点不是数组!\n"; return RET_ERROR; } if (newObject.type() == Json::stringValue || newObject.type() == Json::nullValue) { root.append(strValue); } else { root.append(newObject); } obj = root; } else { vecObject = SplitObject(strKey); //只有单个节点，操作root if (vecObject.size() == 0) { int nStart = strKey.find('['); int nEnd = strKey.find(']'); if (-1 != nStart && -1 != nEnd) { int nPos = -1; sscanf(strKey.substr(nStart+1,nEnd-nStart-1).c_str(),"%d", &nPos); if (nPos < 0) { int nSize = root.size(); //负数下标不能超过size大小 if (nPos*(-1) > nSize) { cout<<"节点下标越界!\n"; return RET_ERROR; } nPos = nPos % nSize; if (nPos != 0) { nPos += nSize; } } else if (nPos > root.size()-1) { cout<<"节点下标越界!\n"; return RET_ERROR; } if (newObject.type() == Json::stringValue || newObject.type() == Json::nullValue) { root[nPos].append(strValue); } else { root[nPos].append(newObject); } } else { if (newObject.type() == Json::stringValue || newObject.type() == Json::nullValue) { root[strKey].append(strValue); } else { root[strKey].append(newObject); } } obj = root; } else { //插入点 Json::Value jObejct = root; if (!GetJsonObject(jObejct, sNode)) { return RET_ERROR; } if (!jObejct.isArray()) { cout<<"节点不是数组!\n"; return RET_ERROR; } if (newObject.type() == Json::nullValue) { jObejct.append(strValue); } else { jObejct.append(newObject); } obj = jObejct; } } for (size_t i=vecObject.size()-1; i>=0; i--) { if (vecObject.size() == 0) { break; } strNode = vecObject[i]; //最后一条 if (i == 0) { int nStart = strNode.find('['); int nEnd = strNode.find(']'); if (-1 != nStart && -1 != nEnd) { int nPos = -1; sscanf(strNode.substr(nStart+1,nEnd-nStart-1).c_str(),"%d", &nPos); if (!root.isArray()) { return RET_ERROR; } if (nPos < 0) { int nSize = root.size(); //负数下标不能超过size大小 if (nPos*(-1) > nSize) { cout<<"节点下标越界!\n"; return RET_ERROR; } nPos = nPos % nSize; if (nPos != 0) { nPos += nSize; } } else if (nPos > root.size()-1) { cout<<"节点下标越界!\n"; return RET_ERROR; } root[nPos] = obj; } else { root[strNode] = obj; } obj = root; break; } strPreNode = vecObject[i-1]; Json::Value tempObject = root; if (!GetJsonObject(tempObject, strPreNode)) { return RET_ERROR; } //获取Key if (strNode.substr(strPreNode.size(),1) == ".") { strKey = strNode.substr(strPreNode.size()+1); } else { strKey = strNode.substr(strPreNode.size()); } //key为数组下标 int nStart = strKey.find('['); int nEnd = strKey.find(']'); if (-1 != nStart && -1 != nEnd) { int nPos = -1; sscanf(strKey.substr(nStart+1,nEnd-nStart-1).c_str(),"%d", &nPos); if (!tempObject.isArray()) { return RET_ERROR; } if (nPos < 0) { int nSize = tempObject.size(); //负数下标不能超过size大小 if (nPos*(-1) > nSize) { cout<<"节点下标越界!\n"; return RET_ERROR; } nPos = nPos % nSize; if (nPos != 0) { nPos += nSize; } } else if (nPos >= tempObject.size()) { cout<<"节点下标越界!\n"; return RET_ERROR; } tempObject[nPos] = obj; } else { tempObject[strKey] = obj; } obj = tempObject; } root = obj; jsonObj = root.toStyledString(); return RET_OK;}**************************************************************************************************
main.cpp
**************************************************************************************************
#include <iostream>#include <string>#include "JsonBase.h"using namespace std;int main(){ string strObject = "{\"a\":[\"1\",\"2\"]}"; JsonBase json; //bool GetJsonObject(Json::Value &jsonObj, string strValue); vector<string> vec; json.GetJsonChildNodeArray(strObject,"",vec); for (int i=0;i<vec.size();i++) { cout<<vec[i]<<endl; } //int SetJsonObejct(string jsonObj, string strNode, string strValue); json.SetJsonObejct(strObject,"a[1]","\"0\""); cout<<strObject<<endl; //int GetJsonValue(string jsonObj,string strNode,string strOut); string strOut; json.GetJsonValue(strObject,"a[1]",strOut); cout<<strOut<<endl; //bool IsNodeExisted(string jsonObj, string strNode); cout<<json.IsNodeExisted(strObject,"a[1]")<<endl; cout<<json.IsNodeExisted(strObject,"a[2]")<<endl; //int AppendArrayObject(string jsonObj, string strNode, string strValue); json.AppendArrayObject(strObject,"a","\"3\""); json.GetJsonValue(strObject,"a",strOut); cout<<strOut<<endl; return 0;}转载源地址：http://blog.csdn.net/timothy721/article/details/19993495
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