golang 解析json字串

@

1. Unmarshal() 函数

func Unmarshal(data []byte, v interface{}) error

说明:

  • data: 要解析的字串
  • v:接收json字串解析结果的实例,可以是struct、map等等。

2. 示例一(结构体接收json字串解析结果)

  • json文件如下
{
"project": {
"project_name": "BeiFa",
"project_num": "A1234567",
"project_manger": {
"name": "ZhuGeLiang",
"number": "000004"
},
"project_members": [{
"name": "ZhaoYun",
"number": "000008"
}, {
"name": "WeiYan",
"number": "000019"
}]
}
}
  • 根据json创建结构体
type projectUser struct {
Name string `json:"name"`
Number string `json:"number"`
}
type project struct {
ProjectName string `json:"project_name"`
ProjectNum string `json:"project_num"`
ProjectManger projectUser `json:"project_manger"`
ProjectMembers []projectUser `json:"project_members"`
}
type projects struct {
Project project `json:"project"`
}
  • 完整代码
package main
import (
"encoding/json"
"fmt"
)
type projectUser struct {
Name string `json:"name"`
Number string `json:"number"`
}
type project struct {
ProjectName string `json:"project_name"`
ProjectNum string `json:"project_num"`
ProjectManger projectUser `json:"project_manger"`
ProjectMembers []projectUser `json:"project_members"`
}
type projects struct {
Project project `json:"project"`
}
func main() {
var p projects
str := `
{
"project": {
"project_name": "BeiFa",
"project_num": "A1234567",
"project_manger": {
"name": "ZhuGeLiang",
"number": "000004"
},
"project_members": [{
"name": "ZhaoYun",
"number": "000008"
}, {
"name": "WeiYan",
"number": "000019"
}]
}
}
`
err := json.Unmarshal([]byte(str), &p)
if err != nil {
fmt.Println(err)
return
}
fmt.Println(p)
fmt.Println(p.Project.ProjectName)
fmt.Println(p.Project.ProjectMembers[0])
}
  • 输出
{{BeiFa A1234567 {ZhuGeLiang 000004} [{ZhaoYun 000008} {WeiYan 000019}]}}
BeiFa
{ZhaoYun 000008}

3.示例二(解析从Get接口得到的json字串)

  • http 的js文件

在 nginx里写一个js文件,内容就用前边的,web访问结果如下:

image.png

  • 完整代码
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
)
type projectUser struct {
Name string `json:"name"`
Number string `json:"number"`
}
type project struct {
ProjectName string `json:"project_name"`
ProjectNum string `json:"project_num"`
ProjectManger projectUser `json:"project_manger"`
ProjectMembers []projectUser `json:"project_members"`
}
type projects struct {
Project project `json:"project"`
}
func main() {
resp, err := http.Get("http://127.0.0.1/index.js")
if err != nil {
fmt.Println(err)
return
}
body, _ := ioutil.ReadAll(resp.Body)
//fmt.Println(string(body))
var projects projects
_ = json.Unmarshal(body,&projects)
fmt.Printf("%+v", projects)
fmt.Println(projects.Project.ProjectManger)
}
  • 输出
{Project:{ProjectName:BeiFa ProjectNum:A1234567 ProjectManger:{Name:ZhuGeLiang Number:000004} ProjectMembers:[{Name:ZhaoYun Number:000008} {Name:WeiYan Number:000019}]}}
{ZhuGeLiang 000004}

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