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刚工作不久,最近遇到一个要解析一个web服务器发过来的json格式的文件,文件如下:
{ "global": { "renew": "true", "serverurl": "192.168.1.100:31208/opinfo/", "frequency": "60" }, "auth": { "enable": "true", "url": "http://192.168.1.10:31208/authpage/13405/文件名" }, "offline": { "enable": "true", "url": "http://192.168.1.10:31208/offinenotify", "parameters": "um#dm#ot#uf#df" }, "jump": { "enable": "true", "url": "http://nav.cathay/index.html", "parameters": "un#dm#um#ui#di#jt" }, "urlwrite": { "enable": "true", "uploadfrequency": "180", "uploadurl": "http://192.168.1.10:31208/uwdupload", "urls": [ { "id": "1", "origin": "http://www.baidu.com", "purpose": "http://www.baidu.com?id=cathay", "terminal": "pc", "percent": "50" }, { "id": "2", "origin": "http://www.soso.com", "purpose": "http://www.baidu.com?id=cathay", "terminal": "ios", "percent": "50" }, { "id": "3", "origin": "http://www.google.com", "purpose": "http://www.baidu.com?id=cathay", "terminal": "android", "percent": "100" } ] }, "whitelist": { "enable": "true", "urls": [ { "url": "http://www.baidu.com" }, { "url": "http://v.qq.com/" } ] } }
解析一下这个json格式的文件
整个文件被一个大括号包含,相当于一个对象,在json中{}包含着的是对象
在这个大对象中又包含global、auth、offline、jump、urlwrite、whitelist这几个对象,这几个名字分别是对象名
像在global、auth、offline、jump中已经不存在对象,只有数据即:“名称:值”,这样的在大对象中取出global、auth、offline、jump这几个对象后就可以取值了
像urlwrite、whitelist这两个对象中又包含着对象,那么要在urlwrite、whitelist的基础上再取对象,然后再取值
这里在json中[]代表这是一个数组。
其实关键是你在处理之前先了解好json它的数据格式到底是什么样,再去了解jsoncpp是怎样解析json数据的就可以了。
下面是我自己写的解析demon:
#include "json/json.h" #include <string> #include <stdlib.h> #include <iostream> #include <fstream> using namespace std; int main() { ifstream is; is.open ("A1-F2-DF-Q2-DC.html", std::ios::binary ); Json::Reader reader; Json::Value root; cout << "beginning...." << endl; if(reader.parse(is,root)) { cout << "将整个Json对象的value保存到root中去了" << endl; cout << endl; Json::Value arrayObj = root["global"]; string tmp = arrayObj["renew"].asString(); cout << "global---renew:" << tmp << endl; tmp.clear(); tmp = arrayObj["serverurl"].asString(); cout << "global---serverurl:" << tmp << endl; tmp.clear(); tmp = arrayObj["frequency"].asString(); cout << "global---frequency:" << tmp << endl; tmp.clear(); cout << endl; Json::Value arrayObj1 = root["auth"]; tmp = arrayObj1["enable"].asString(); cout << "auth---enable:" << tmp << endl; tmp.clear(); tmp = arrayObj1["url"].asString(); cout << "auth---url:" << tmp << endl; tmp.clear(); cout << endl; Json::Value arrayObj2 = root["jump"]; tmp = arrayObj2["enable"].asString(); cout << "jump---enable" << tmp << endl; tmp.clear(); tmp = arrayObj2["url"].asString(); cout << "jump---url" << tmp << endl; tmp.clear(); tmp = arrayObj2["parameters"].asString(); cout << "jump---parameters" << tmp << endl; tmp.clear(); cout << endl; Json::Value arrayObj3 = root["offline"]; tmp = arrayObj3["enable"].asString(); cout << "jump---enable" << tmp << endl; tmp.clear(); tmp = arrayObj3["url"].asString(); cout << "jump---url" << tmp << endl; tmp.clear(); tmp = arrayObj3["parameters"].asString(); cout << "jump---parameters" << tmp << endl; tmp.clear(); cout << endl; Json::Value arrayObj4 = root["whitelist"]; tmp = arrayObj4["enable"].asString(); cout << "whitelist---enable:" << tmp << endl; tmp.clear(); Json::Value arrayObj5 = arrayObj4["urls"]; for(int i = 0; i != arrayObj5.size(); i++) { tmp = arrayObj5[i]["url"].asString(); cout << "whitelist---url" << i << ":" << tmp << endl; tmp.clear(); } Json::Value arrayObj6 = root["urlwrite"]; tmp = arrayObj6["enable"].asString(); cout << "urlwrite---enable:" << tmp << endl; tmp.clear(); tmp = arrayObj6["uploadfrequency"].asString(); cout << "urlwrite---uploadfrequency:" << tmp << endl; tmp = arrayObj6["uploadurl"].asString(); cout << "urlwrite---uploadurl:" << tmp << endl; tmp.clear(); Json::Value arrayObj7 = arrayObj6["urls"]; for(int i = 0; i != arrayObj7.size(); i++) { tmp = arrayObj7[i]["id"].asString(); cout << "urlwrite---urls---id:" << tmp << endl; tmp.clear(); tmp = arrayObj7[i]["origin"].asString(); cout << "urlwrite---urls---origin:" << tmp << endl; tmp.clear(); tmp = arrayObj7[i]["purpose"].asString(); cout << "urlwrite---urls---purpose:" << tmp << endl; tmp.clear(); tmp = arrayObj7[i]["terminal"].asString(); cout << "urlwrite---urls---terminal:" << tmp << endl; tmp.clear(); tmp = arrayObj7[i]["percent"].asString(); cout << "urlwrite---urls---percent:" << tmp << endl; tmp.clear(); } } return 0; }
编译操作:g++ c.cpp -I ./include/ libjson_linux-gcc-4.8_libmt.a
这里解析一下,include和.a文件都是编译jsoncpp生成的,至于怎么编译jsoncpp,我更建议自己度娘一下,然后自己会更清楚点。
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原文地址:http://www.cnblogs.com/DamonBlog/p/4273440.html