#include<iostream>
#include <string>
#include "json.h"
using namespace std;
using namespace Json;
void readJson()
{
std::string strValue = "{\"name\":\"json\",\"array\":[{\"cpp\":\"jsoncpp\"},{\"java\":\"jsoninjava\"},{\"php\":\"support\"}]}";
Json::Reader reader;
Json::Value value;
if (reader.parse(strValue, value))
{
std::string out = value["name"].asString();
std::cout << out << std::endl;
const Json::Value arrayObj = value["array"];
for (unsigned int i = 0; i < arrayObj.size(); i++)
{
if (!arrayObj[i].isMember("cpp"))
continue;
out = arrayObj[i]["cpp"].asString();
std::cout << out;
if (i != (arrayObj.size() - 1))
std::cout << std::endl;
}
}
}
void writeJson()
{
Json::Value root;
Json::Value arrayObj;
Json::Value item;
item["cpp"] = "jsoncpp";
item["java"] = "jsoninjava";
item["php"] = "support";
arrayObj.append(item);
root["name"] = "json";
root["array"] = arrayObj;
root.toStyledString();
std::string out = root.toStyledString();
std::cout << out << std::endl;
}
int main() {
readJson();
cout << "---------------------------------------------" << endl;
writeJson();
return 0;
}
处理下中央气象台返回的json数据：
#include<iostream>
#include <string>
#include "json.h"
using namespace std;
using namespace Json;
void readJson()
{
Json::Reader reader;
Json::Value value;
Json::FastWriter fast_write;
Json::StyledWriter style_write;
std::string strValue = "{\"weatherinfo\":[{\"city\":\"北京\",\"city_en\":\"beijing\",\"date_y\":\"2013年2月16日\",\"date\":\"\",\"week\":\"星期六\",\"fchh\":\"08\",\"cityid\":\"101010100\",\"temp1\":\"4℃~-3℃\",\"temp2\":\"6℃~-4℃\",\"temp3\":\"3℃~-8℃\",\"temp4\":\"3℃~-6℃\",\"temp5\":\"4℃~-6℃\",\"temp6\":\"4℃~-5℃\",\"tempF1\":\"39.2℉~26.6℉\",\"tempF2\":\"42.8℉~24.8℉\",\"tempF3\":\"37.4℉~17.6℉\",\"tempF4\":\"37.4℉~21.2℉\",\"tempF5\":\"39.2℉~21.2℉\",\"tempF6\":\"39.2℉~23℉\",\"weather1\":\"多云转阴\",\"weather2\":\"多云转晴\",\"weather3\":\"晴\",\"weather4\":\"晴\",\"weather5\":\"晴转多云\",\"weather6\":\"多云转晴\",\"img1\":\"1\",\"img2\":\"2\",\"img3\":\"1\",\"img4\":\"0\",\"img5\":\"0\",\"img6\":\"99\",\"img7\":\"0\",\"img8\":\"99\",\"img9\":\"0\",\"img10\":\"1\",\"img11\":\"1\",\"img12\":\"0\",\"img_single\":\"1\",\"img_title1\":\"多云\",\"img_title2\":\"阴\",\"img_title3\":\"多云\",\"img_title4\":\"晴\",\"img_title5\":\"晴\",\"img_title6\":\"晴\",\"img_title7\":\"晴\",\"img_title8\":\"晴\",\"img_title9\":\"晴\",\"img_title10\":\"多云\",\"img_title11\":\"多云\",\"img_title12\":\"晴\",\"img_title_single\":\"多云\",\"wind1\":\"微风\",\"wind2\":\"北风3-4级\",\"wind3\":\"北风3-4级转微风\",\"wind4\":\"微风\",\"wind5\":\"微风\",\"wind6\":\"微风\",\"fx1\":\"微风\",\"fx2\":\"微风\",\"fl1\":\"小于3级\",\"fl2\":\"3-4级\",\"fl3\":\"3-4级转小于3级\",\"fl4\":\"小于3级\",\"fl5\":\"小于3级\",\"fl6\":\"小于3级\",\"index\":\"冷\",\"index_d\":\"天气冷，建议着棉服、羽绒服、皮夹克加羊毛衫等冬季服装。年老体弱者宜着厚棉衣、冬大衣或厚羽绒服。\",\"index48\":\"寒冷\",\"index48_d\":\"天气寒冷，建议着厚羽绒服、毛皮大衣加厚毛衣等隆冬服装。年老体弱者尤其要注意保暖防冻。\",\"index_uv\":\"最弱\",\"index48_uv\":\"最弱\",\"index_xc\":\"适宜\",\"index_tr\":\"适宜\",\"index_co\":\"较不舒适\",\"st1\":\"4\",\"st2\":\"-2\",\"st3\":\"5\",\"st4\":\"-3\",\"st5\":\"2\",\"st6\":\"-7\",\"index_cl\":\"适宜\",\"index_ls\":\"基本适宜\",\"index_ag\":\"极不易发\"}]}";
if (reader.parse(strValue, value))
{
//std::cout << fast_write.write(value) << std::endl;
std::cout << style_write.write(value) << std::endl;
}
}
int main() {
readJson();
return 0;
}输出结果：
{
"weatherinfo" : [
{
"city" : "北京",
"city_en" : "beijing",
"cityid" : "101010100",
"date" : "",
"date_y" : "2013年2月16日",
"fchh" : "08",
"fl1" : "小于3级",
"fl2" : "3-4级",
"fl3" : "3-4级转小于3级",
"fl4" : "小于3级",
"fl5" : "小于3级",
"fl6" : "小于3级",
"fx1" : "微风",
"fx2" : "微风",
"img1" : "1",
"img10" : "1",
"img11" : "1",
"img12" : "0",
"img2" : "2",
"img3" : "1",
"img4" : "0",
"img5" : "0",
"img6" : "99",
"img7" : "0",
"img8" : "99",
"img9" : "0",
"img_single" : "1",
"img_title1" : "多云",
"img_title10" : "多云",
"img_title11" : "多云",
"img_title12" : "晴",
"img_title2" : "阴",
"img_title3" : "多云",
"img_title4" : "晴",
"img_title5" : "晴",
"img_title6" : "晴",
"img_title7" : "晴",
"img_title8" : "晴",
"img_title9" : "晴",
"img_title_single" : "多云",
"index" : "冷",
"index48" : "寒冷",
"index48_d" : "天气寒冷，建议着厚羽绒服、毛皮大衣加厚毛衣等隆冬服装。年
老体弱者尤其要注意保暖防冻。",
"index48_uv" : "最弱",
"index_ag" : "极不易发",
"index_cl" : "适宜",
"index_co" : "较不舒适",
"index_d" : "天气冷，建议着棉服、羽绒服、皮夹克加羊毛衫等冬季服装。年老
体弱者宜着厚棉衣、冬大衣或厚羽绒服。",
"index_ls" : "基本适宜",
"index_tr" : "适宜",
"index_uv" : "最弱",
"index_xc" : "适宜",
"st1" : "4",
"st2" : "-2",
"st3" : "5",
"st4" : "-3",
"st5" : "2",
"st6" : "-7",
"temp1" : "4℃~-3℃",
"temp2" : "6℃~-4℃",
"temp3" : "3℃~-8℃",
"temp4" : "3℃~-6℃",
"temp5" : "4℃~-6℃",
"temp6" : "4℃~-5℃",
"tempF1" : "39.2℉~26.6℉",
"tempF2" : "42.8℉~24.8℉",
"tempF3" : "37.4℉~17.6℉",
"tempF4" : "37.4℉~21.2℉",
"tempF5" : "39.2℉~21.2℉",
"tempF6" : "39.2℉~23℉",
"weather1" : "多云转阴",
"weather2" : "多云转晴",
"weather3" : "晴",
"weather4" : "晴",
"weather5" : "晴转多云",
"weather6" : "多云转晴",
"week" : "星期六",
"wind1" : "微风",
"wind2" : "北风3-4级",
"wind3" : "北风3-4级转微风",
"wind4" : "微风",
"wind5" : "微风",
"wind6" : "微风"
}
]
}
请按任意键继续. . .
#include<iostream>
#include <string>
#include "json.h"
using namespace std;
using namespace Json;
void readJson()
{
Json::Reader reader;
Json::Value value;
Json::FastWriter fast_write;
Json::StyledWriter style_write;
std::string strValue = "{\"weatherinfo\":{\"city\":\"北京\",\"city_en\":\"beijing\",\"date_y\":\"2013年2月16日\",\"date\":\"\",\"week\":\"星期六\",\"fchh\":\"08\",\"cityid\":\"101010100\",\"temp1\":\"4℃~-3℃\",\"temp2\":\"6℃~-4℃\",\"temp3\":\"3℃~-8℃\",\"temp4\":\"3℃~-6℃\",\"temp5\":\"4℃~-6℃\",\"temp6\":\"4℃~-5℃\",\"tempF1\":\"39.2℉~26.6℉\",\"tempF2\":\"42.8℉~24.8℉\",\"tempF3\":\"37.4℉~17.6℉\",\"tempF4\":\"37.4℉~21.2℉\",\"tempF5\":\"39.2℉~21.2℉\",\"tempF6\":\"39.2℉~23℉\",\"weather1\":\"多云转阴\",\"weather2\":\"多云转晴\",\"weather3\":\"晴\",\"weather4\":\"晴\",\"weather5\":\"晴转多云\",\"weather6\":\"多云转晴\",\"img1\":\"1\",\"img2\":\"2\",\"img3\":\"1\",\"img4\":\"0\",\"img5\":\"0\",\"img6\":\"99\",\"img7\":\"0\",\"img8\":\"99\",\"img9\":\"0\",\"img10\":\"1\",\"img11\":\"1\",\"img12\":\"0\",\"img_single\":\"1\",\"img_title1\":\"多云\",\"img_title2\":\"阴\",\"img_title3\":\"多云\",\"img_title4\":\"晴\",\"img_title5\":\"晴\",\"img_title6\":\"晴\",\"img_title7\":\"晴\",\"img_title8\":\"晴\",\"img_title9\":\"晴\",\"img_title10\":\"多云\",\"img_title11\":\"多云\",\"img_title12\":\"晴\",\"img_title_single\":\"多云\",\"wind1\":\"微风\",\"wind2\":\"北风3-4级\",\"wind3\":\"北风3-4级转微风\",\"wind4\":\"微风\",\"wind5\":\"微风\",\"wind6\":\"微风\",\"fx1\":\"微风\",\"fx2\":\"微风\",\"fl1\":\"小于3级\",\"fl2\":\"3-4级\",\"fl3\":\"3-4级转小于3级\",\"fl4\":\"小于3级\",\"fl5\":\"小于3级\",\"fl6\":\"小于3级\",\"index\":\"冷\",\"index_d\":\"天气冷，建议着棉服、羽绒服、皮夹克加羊毛衫等冬季服装。年老体弱者宜着厚棉衣、冬大衣或厚羽绒服。\",\"index48\":\"寒冷\",\"index48_d\":\"天气寒冷，建议着厚羽绒服、毛皮大衣加厚毛衣等隆冬服装。年老体弱者尤其要注意保暖防冻。\",\"index_uv\":\"最弱\",\"index48_uv\":\"最弱\",\"index_xc\":\"适宜\",\"index_tr\":\"适宜\",\"index_co\":\"较不舒适\",\"st1\":\"4\",\"st2\":\"-2\",\"st3\":\"5\",\"st4\":\"-3\",\"st5\":\"2\",\"st6\":\"-7\",\"index_cl\":\"适宜\",\"index_ls\":\"基本适宜\",\"index_ag\":\"极不易发\"}}";
if (reader.parse(strValue, value))
{
//std::cout << style_write.write(value) << std::endl;
std::cout << value["weatherinfo"]["city"].asString() << endl;
std::cout << value["weatherinfo"]["date_y"].asString() << endl;
std::cout << value["weatherinfo"]["week"].asString() << endl;
}
}
int main() {
readJson();
return 0;
}输出：
北京 2013年2月16日 星期六 请按任意键继续. . .