golang解析json
2015-08-07 | pyinx | golang

1. 需求

获取多级json字符串中的errstr的值

json字符串示例：

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#cat json.txt 
{"app":"test","action":"test.error:app","runtime":1438913605,"server_ip":"1.1.1.1","exe_time":"0.0023","item":{"brief":{"request_api":"testapi","request_params":{"clientid":"11111111","xx":1438913605.964},"client_ip":"0.0.0.0","server_ip":"1.1.1.1"},"detail":{"header":{"code":10006,"info":"info message","desc":"unknown error","record":false},"body":{"errno":8,"errstr":"mysql has gone away","errfile":"/home/data/www/test.php","errline":21}}}}

2. 通过json标准库

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package main

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

var jsonmap map[string]interface{}

func main() {
    jsonstr, _ := ioutil.ReadFile("./json.txt")

    if err := json.Unmarshal(jsonstr, &jsonmap); err != nil {
        fmt.Printf("decode err: %s\n", err)
        return
    }

    item := jsonmap["item"]
    itemMap, _ := item.(map[string]interface{})
    detail, _ := itemMap["detail"]
    detailMap, _ := detail.(map[string]interface{})
    body, _ := detailMap["body"]
    bodyMap, _ := body.(map[string]interface{})
    fmt.Printf("%v\n", bodyMap["errstr"])
}

3. 通过go-simplejson

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package main

import (
    "fmt"
    "github.com/bitly/go-simplejson"
    "io/ioutil"
)

func main() {
    jsonstr, _ := ioutil.ReadFile("./json.txt")

    sj, err := simplejson.NewJson(jsonstr)
    if err != nil {
        panic(err)
    }
    value, _ := sj.Get("item").Get("detail").Get("body").Get("errstr").String()
    fmt.Println(value)
}