开通API
通过ai.baidu.com或cloud.baidu.com进行登录，进入“管理控制台”后，在“已开通服务”板块下的“文字识别”中申请开通API。
API使用流程
1、调用获取access token的接口，需提供客户API Key和Secret Key；
2、调用具体api，需提供access token；
3、access token可以反复使用，但有一定的有效期，失效后需要重新获取。
Demo代码
package main
import (
"encoding/base64"
"encoding/json"
"fmt"
"github.com/asaskevich/govalidator"
"github.com/bitly/go-simplejson"
"io/ioutil"
"net/http"
"net/url"
"strings"
)
const (
clientID = "cmnLxxxxVgyaEf" // API Key
clientSecret = "zPkV7xxxxxZH77Q2" // Secret Key
)
type Session struct {
AccessToken string `json:"access_token"`
RefreshToken string `json:"refresh_token"`
SessionKey string `json:"session_key"`
SessionSecret string `json:"session_secret"`
Scope string `json:"scope"`
ExpiresIn int `json:"expires_in"`
}
func main() {
token, err := accessToken(clientID, clientSecret)
if err != nil {
fmt.Println("accessToken Error: ", err)
return
}
fmt.Println("Token:", *token)
img, err := ioutil.ReadFile("test.JPG")//官方提示JPG成功率较高
if err != nil {
fmt.Println("ReadFile Error: ", err)
return
}
err = ImageToText(*token, img)
if err != nil {
fmt.Println("ImageToText Error: ", err)
return
}
}
func accessToken(id string, secret string) (token *string, err error) {
apiURL := fmt.Sprintf("https://aip.baidubce.com/oauth/2.0/token?grant_type=client_credentials&client_id=%s&client_secret=%s", id, secret)
resp, err := http.Get(apiURL)
if err != nil {
fmt.Println("HTTP Get Error")
return nil, err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
fmt.Println("Read Response Body Error")
return nil, err
}
var session Session
err = json.Unmarshal(body, &session)
if err != nil {
fmt.Println("Unmarshal Session Json Error")
return nil, err
}
token = &session.AccessToken
return token, nil
}
func ImageToText(token string, image []byte) error {
apiURL := fmt.Sprintf("https://aip.baidubce.com/rest/2.0/ocr/v1/accurate_basic?access_token=%s", token)
param := "image=" + url.QueryEscape(base64.StdEncoding.EncodeToString(image))
resp, err := http.Post(apiURL, "application/x-www-form-urlencoded", strings.NewReader(param))
if err != nil {
return err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
fmt.Println("Read Response Body Error")
return err
}
json, err := simplejson.NewJson([]byte(body))
if err != nil {
fmt.Println("Unmarshal Result Json Error")
return err
}
rows,err := json.Get("words_result").Array()
if err != nil{
fmt.Println("Json Get Error: ",err)
}
//fmt.Println(rows)
//这里对结果潦草处理了下便于显示
for k,_ := range rows{
words := govalidator.ToString(rows[k])
words = string([]rune(words)[10:])
words = strings.Trim(words, "]")
fmt.Println(words)
}
return nil
}
