Golang with JSON
/codes/golang/json/main.go
package main
import (
"encoding/json"
"log"
)
func main() {
jsonStr := `
["one", "two"]
`
var array []string
err := json.Unmarshal([]byte(jsonStr), &array)
if err != nil {
log.Println(err)
} else {
log.Println(array)
}
}
数据格式转换
下面的例子中，可以将 JSON 中同一个字段不同数据类型统一转换为字符串格式
/codes/golang/json-marshal/main.go
package main
import (
"encoding/json"
"fmt"
"log"
"strings"
)
var json_str = `{
"value": "GOOD",
"name":"name"
}`
var json_bool = `{
"value": false,
"name":"good"
}`
type Form struct {
Value ComposeValue
Name string
}
type ComposeValue struct {
Value string
}
func (f *ComposeValue) UnmarshalJSON(data []byte) error {
originStr := strings.Trim(string(data), `"`)
switch str := strings.ToLower(originStr); str {
case "true":
f.Value = "true"
case "false":
f.Value = "false"
default:
f.Value = originStr
}
return nil
}
func (f ComposeValue) MarshalJSON() ([]byte, error) {
return json.Marshal(f.Value)
}
func (f ComposeValue) String() string {
return f.Value
}
func main() {
var data []byte
var err error
form := &Form{}
if err := json.Unmarshal([]byte(json_str), form); err != nil {
log.Fatal(err)
}
if data, err = json.Marshal(form); err != nil {
log.Fatal(err)
}
fmt.Println(string(data))
if err := json.Unmarshal([]byte(json_bool), form); err != nil {
log.Fatal(err)
}
data, _ = json.Marshal(form)
fmt.Println(string(data))
}