使用 Golang 的 json 解析库遇到的一点问题

一个请求 ISBN 查询 API 的服务，查询信息的字段是：

type info struct {
	ISBN       string `json:"isbn"`
	Title      string `json:"title"`
	Subtitle   string `json:"subtitle"`
	Pic        string `json:"pic"`
	Author     string `json:"author"`
	Summary    string `json:"summary"`
	Publisher  string `json:"publisher"`
	Pubplace   string `json:"pubplace"`
	Page       int    `json:"page"`
	Price      string `json:"price"`
	Binding    string `json:"binding"`
	Keyword    string `json:"keyword"`
	Edition    string `json:"edition"`
	Impression string `json:"impression"`
	Language   string `json:"language"`
	Format     string `json:"format"`
	Class      string `json:"class"`
}

这里的 page 最初我写了 string 类型，然后解析报错了json: cannot unmarshal number into Go value of type string

然后我改为了 int 类型，然后依然会时不时报错json: cannot unmarshal string into Go struct field info.page of type int？？？昨天报错了几次，之后却一直正常想复现都不行，今天又报错了。查验了那个 ISBN API 应该没有问题，给的 page 就是 integer

但是这里报错后却插入数据库了，逻辑是这样的：

func get(isbn string) (*info, error) {
	url := baseURL + isbn
	resp, err := nic.Get(url, nil)
	if err != nil {
		return nil, err
	}

	t := &tmp{0, "", &info{}}
	err = resp.JSON(t)   //***************************************** error here
	if err != nil {
		return nil, err
	}
	if t.Status != 0 {
		return nil, errors.New(t.Msg)
	}

	return t.Result, nil
}

func query(c *mgo.Collection, isbn string) (*info, error) {
	data := &info{}
	c.Find(bson.M{"isbn": isbn}).One(data)

	if data.ISBN == "" {
		var err error
		data, err = get(isbn)
		if err != nil {
			return nil, err
		}
		err = c.Insert(data)
		if err != nil {
			return nil, err
		}
	}
	return data, nil
}

而且第一次报错后插入数据库的数据却是正确的，page 就是正确的 integer：

 {'isbn': '9787212053937', 'page': 236, 'price': '21.50', 'binding': '', 'keyword': '', 'edition': '', 'impression': '', 'language': '', 'format': '', 'class': ''}

orz

whoami9894

2019-05-30 19:13:00 +08:00

@wangsongyan
@petelin

感谢回复，我又测试了一下，果然这个 zz 的 API 第一次请求返回 int 之后都返回 string，服了......

```
2019/05/30 19:08:29 int
2019/05/30 19:08:29 {"status":0,"msg":"ok","result":{"title":"课本全解（ 5 年级上）","
author":null,"subtitle":null,"pubdate":" 2012-7","page":" 236","price":" 21.50 元","s ummary":"","pic":"http:\/\/api.jisuapi.com\/isbn\/\/upload\/3663\/3662449.","isbn":"9787212053928","isbn10":"7212053929","sellerlist":[{"seller":"douban","price":"21.50"}]}}
2019/05/30 19:08:29 89
2019/05/30 19:08:29 json: cannot unmarshal string into Go struct field info.page of type int

[GIN] 2019/05/30 - 19:08:29 | 200 | 1.5377224s | 127.0.0.1 | POST /api/v1/isbn-query
2019/05/30 19:10:06 int
2019/05/30 19:10:06 {"status":0,"msg":"ok","result":{"title":"课本全解（ 5 年级上）","
subtitle":null,"pic":"http:\/\/api.jisuapi.com\/isbn\/upload\/3663\/3662449.","author":null,"summary":null,"publisher":null,"pubplace":null,"pubdate":" 2012-7","page":236,"price":"21.50","binding":null,"isbn":"9787212053928","isbn10":"7212053929","keyword":null,"edition":null,"impression":null,"language":null,"format":null,"class":null,"sellerlist":[{"seller":"douban","price":"21.50"}]}}
[GIN] 2019/05/30 - 19:10:06 | 200 | 176.5282ms | 127.0.0.1 | POST /api/v1/isbn-query
[GIN] 2019/05/30 - 19:10:16 | 200 | 0s | 127.0.0.1 | POST /api/v1/isbn-query
```