利用rapidjson解析嵌套的json
发布时间:2020-12-16 19:02:07 所属栏目:百科 来源:网络整理
导读:看json串1: {"system":{"version":"v2.6.1","name":"value"}} 废话少说, 直接撸代码: #include iostream#include stdio.h#includeunistd.h#include sys/types.h#include sys/stat.h#include fcntl.h#includesstream// 请自己下载开源的rapidjson#include
看json串1: {"system":{"version":"v2.6.1","name":"value"}} 废话少说, 直接撸代码: #include <iostream> #include <stdio.h> #include<unistd.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include<sstream> // 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 getVersion(const string &jvStr) { Document document; if (document.Parse(jvStr.c_str()).HasParseError() || !document.HasMember("system")) { return ""; } const rapidjson::Value &jvObject = document["system"]; if(!jvObject.IsObject()) { return ""; } if(!jvObject.HasMember("version")) { return ""; } const rapidjson::Value &jv = jvObject["version"]; return jv.GetString(); } int main(int argc,char *argv[]) { string s = "{"system":{"version":"v2.6.1","name":"value"}}"; cout << s << endl; cout << getVersion(s) << endl; return 0; }结果: {"system":{"version":"v2.6.1","name":"value"}}
再看字符串:{"system": "{"version":"v2.6.1","name":"value"}"} 直接上马: #include <iostream> #include <stdio.h> #include<unistd.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include<sstream> // 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 getStringFromJson(const string &jsStr,const string &strKey) { Document document; if (document.Parse(jsStr.c_str()).HasParseError() || !document.HasMember(strKey.c_str())) { return ""; } const rapidjson::Value &jv = document[strKey.c_str()]; return jv.GetString(); } int main(int argc,char *argv[]) { string s = "{"system": "{"version":"v2.6.1","name":"value"}"}"; cout << s << endl; string str = getStringFromJson(s,"system"); cout << str << endl; cout << getStringFromJson(str,"version") << endl; return 0; }结果: {"system": "{"version":"v2.6.1","name":"value"}"} 第二种方式的json串, 看起来太恶心了。
另外, 再次强调一下, json串解析的时候, 容易core dump,所以要做好异常判断, 也要注意类型。 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |