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How to use golang source code analysis json.Marshal, for this problem, this article details the corresponding analysis and solution, hoping to help more small partners who want to solve this problem find a simpler and easier way.

Golang structs can be annotated like @JsonProperty("id") in Java. A string enclosed in backquotes inside a struct is called a Tag.

type Cyeam struct {

Url string `json:"url"`

Other string `json:"-"`

}

By adding the definition of json's Tag to Tag, you can control the format of the output. Also, if the Tag of the json field is defined as-, it will not be resolved.

Such a powerful function, with the help of reflect package, it is not difficult to achieve.

c := Cyeam{Url: "blog.cyeam.com", Other: "... "}

var t reflect.Type

t = reflect.TypeOf(c)

var v reflect.Value

v = reflect.ValueOf(c)

json := "{"

for i := 0; i < t.NumField(); i++ {

if t.Field(i).Tag.Get("json") != "-" {

json += "\"" + t.Field(i).Tag.Get("json") + "\":\"" + v.FieldByName(t.Field(i).Name).String() + "\""

}

}

json += "}"

fmt.Println(json)

{"url":"blog.cyeam.com"}

For each object, you can get its Type and Value. The t.NumField() method gets the number of values contained in the structure, and t.Field(i) gets the value of the variable at the index value. With these two methods, it is possible to traverse structure variables. t.Field(i).Tag.Get("json") gets the Tag of the current field and gets the Tag value of json from it. In this way, we can complete the traversal of the structure and the final generation of the JSON stream.

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