Hyperledger fabric 学习笔记： go语言 与 JSON

1、JSON 介绍

JSON(JavaScript Object Notation, JS 对象标记) 是一种轻量级的数据交换格式。具体介绍可参考https://zh.wikipedia.org/wiki/JSON

2、JSON 与 Go

Go语言自带的JSON转换库为 encoding/json。

http://golang.org/doc/articles/json_and_go.html，这是官方的一篇博客，介绍的挺详细，不过是英文版的。

3、用处

//引用 hyperledger fabric-ca 的go语言代码
type RegistrationRequest struct {
// Name is the unique name of the identity
Name string `json:"id" help:"Unique name of the identity"`
// Type of identity being registered (e.g. "peer, app, user")
Type string `json:"type" help:"Type of identity being registered (e.g. 'peer, app, user')"`
// Secret is an optional password.  If not specified,
// a random secret is generated.  In both cases, the secret
// is returned in the RegistrationResponse.
Secret string `json:"secret,omitempty" help:"The enrollment secret for the identity being registered"`
// MaxEnrollments is the maximum number of times the secret can
// be reused to enroll.
MaxEnrollments int `json:"max_enrollments,omitempty" help:"The maximum number of times the secret can be reused to enroll."`
// is returned in the response.
// The identity's affiliation.
// For example, an affiliation of "org1.department1" associates the identity with "department1" in "org1".
Affiliation string `json:"affiliation" help:"The identity's affiliation"`
// Attr is used to support a single attribute provided through the fabric-ca-client CLI
Attr string `help:"Attributes associated with this identity (e.g. hf.Revoker=true)"`
// Attributes associated with this identity
Attributes []Attribute `json:"attrs,omitempty"`
}

结构体成员变量 ‘xxxx’ 里面的 json字符串是Go语言的structTag。

structTag：如果希望手动配置结构体的成员和JSON字段的对应关系，可以在定义结构体的时候给成员打标签：

使用omitempty熟悉，如果该字段为nil或0值（数字0,字符串”“,空数组[]等），则打包的JSON结果不会有这个字段。

样例：点击打开链接

4、其他用法

可参考博客：http://blog.csdn.net/tiaotiaoyly/article/details/38942311