Golang解析复杂的JSON

Question

I am new to golang and json and currently struggle to parse the json out from a system.

I've read a couple of blog posts on dynamic json in go and also tried the tools like json2GoStructs Parsing my json file with this tools just gave me a huge structs which I found a bit messy. Also I had no idea how to get the info im interested in.

So, here are my problems:

1. How do I get to the info I am interested in?
2. What is the best approach to parse complex json?

I am only interested into the following 3 json fields:

Name
Guid
Task -> Property -> Name: Error

I'm thankful for every tip, code snippet or explanation!

This is what I got so far (mostly from a tutorial):

package main

import (
    "encoding/json"
    "fmt"
    "io/ioutil"
)

func checkErr(err error) {
    if err != nil {
        panic(err)
    }
}

func readFile(filePath string) []byte {
    data, err := ioutil.ReadFile(filePath)
    checkErr(err)
    return data
}

func main() {
    path := "/Users/andi/Documents/tmp/wfsJob.json"
    data := readFile(path)

    var f interface{}

    err := json.Unmarshal(data, &f)
    checkErr(err)

    m := f.(map[string]interface{})

    for k, v := range m {
        switch vv := v.(type) {
        case string:
            fmt.Println(k, "is string", vv)
        case int:
            fmt.Println(k, "is int", vv)
        case []interface{}:
            fmt.Println(k, "is an array:")
            for i, u := range vv {
                fmt.Println(i, u)
            }
        default:
            fmt.Println(k, "is of a type I don't know how to handle")
        }
    }
}

Answer 1

I can offer you this easy way to using JSON in Golang. With this tool you don't need to parse the whole json file, and you can use it without struct.