I am trying to Parse Json & Print Data and save in a CSV using GO language .
It is printing the desired 10 result per page with Println
but couldn't parse JSON .
This is what I am doing
Visitor visits studentresults.com/page=1 RollNo. & Marks for 10 students are displayed and it is also saved in a CSV [
key.rollno
&key.marks
]-
Program Makes a request to
studentsapimarks.com/api/rollno1,rollno2,rollno3/detail
(appending all key.rollno that we got in step1) The Json response would be like[{"name":"James","Percentage":96.5,"Remarks":"VeryGood"}, {"name":"William","Percentage":36.0,"Remarks":"Bad"}, {"name":"Jacob","Percentage":63.0,"Remarks":"Average"}, {"name":"Wilson","Percentage":69.3,"Remarks":"Average"}, {"name":"Kurtson","Percentage":16.9,"Remarks":"VeryBad"}, {"name":"Tom","Percentage":86.3,"Remarks":"Good"}]
Extract Name & Percentage fields & save in a csv
Here is my snippet of the code that is responsible for printing and saving the results
package main
import (
"encoding/csv"
"fmt"
"net/http"
"os"
"strings"
"encoding/json"
)
type Key struct {
fname string
marks int
rollno int
}
type object struct {
Percentage float64
Name string `json:"name"`
}
func PageRequest(w http.ResponseWriter, r *http.Request) {
// Page header
fmt.Fprintf(w, PageHeader, pages, previous, next)
// Save in csv
csvfile, err := os.OpenFile("marks.csv", os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0666)
if err != nil {
fmt.Println("Error:", err)
return
}
defer csvfile.Close()
writer := csv.NewWriter(csvfile)
defer writer.Flush()
// Defining RollNos
var rollNos []string
// Marks for UID
UID, length := compute(start)
for i := 0; i < length; i++ {
key := UID[i]
// Prints firstname, Marks and Rollno
fmt.Fprintf(w, key.fname, key.marks, key.rollno)
records := [][]string{{key.fname, key.marks, key.rollno}}
for _, record := range records {
err := writer.Write(record)
if err != nil {
fmt.Println("Error:", err)
return
}
}
// Append All key.rollno
rollNos := append(rollNos, key.rollno)
// Makes a request to as studentsapimarks.com/api/rollno1,rollno2,rollno3/detail
uri := "https://studentsapimarks.com/api/" + strings.Join(rollNos, ",") + "/detail"
res, err := http.Get(uri)
if err != nil {
log.Fatal(err)
}
defer res.Body.Close()
var s []object
err = json.NewDecoder(res.Body).Decode(&s)
if err != nil {
log.Fatal(err)
}
// Prints Name/ Percentage
fmt.Println(s[0].Name)
fmt.Println(s[0].Percentage)
}
// Page Footer
fmt.Fprintf(w, PageFooter, previous, next)
}
func main() {
http.HandleFunc("/", PageRequest)
log.Println("Listening")
log.Fatal(http.ListenAndServe(":8080", nil))
}
fmt.Fprintf(w, key.fname, key.marks, key.rollno)
is working fine and displays all 10 results per page and saves in a csv .
Problem with the code is
It is not appending all
key.rollno
that we got in step1 asstudentsapimarks.com/api/rollno1,rollno2,rollno3/detail
Also how could i save the JSON extracted
s[0].name
results in a CSV ?