golang 解析json字串

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目录

• 1. Unmarshal() 函数
• 2. 示例一（结构体接收json字串解析结果）
• 3.示例二（解析从Get接口得到的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：

• 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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