背景需求,

官方SDK,在SpringBoot项目中过于臃肿,需要引入的Jar包过多,

在SpringBoot中,

本文使用SpringBoot中的RestTemplate对象进行请求接口

案例代码如下

package com.example.demo2.Test;import com.example.demo2.Test.Ocr.OcrResponse;
import org.springframework.http.*;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.*;
public class OcrV3Demo2 {private static final String YOUDAO_URL = "https://openapi.youdao.com/ocrapi";private static final String APP_KEY = "AppID";private static final String APP_SECRET = "密钥";public static void main(String[] args) throws IOException {RestTemplate restTemplate = new RestTemplate();MultiValueMap<String, String> params = new LinkedMultiValueMap<>();String q = loadAsBase64("图片地址....");String salt = String.valueOf(System.currentTimeMillis());String detectType = "10012";String imageType = "1";String langType = "auto";params.add("detectType", detectType);params.add("imageType", imageType);params.add("langType", langType);params.add("img", q);params.add("docType", "json");params.add("signType", "v3");String curtime = String.valueOf(System.currentTimeMillis() / 1000);params.add("curtime", curtime);String signStr = APP_KEY + truncate(q) + salt + curtime + APP_SECRET;String sign = getDigest(signStr);params.add("appKey", APP_KEY);params.add("salt", salt);params.add("sign", sign);HttpHeaders headers = new HttpHeaders();headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);HttpEntity<MultiValueMap<String, String>> requestEntity = new HttpEntity<>(params, headers);ResponseEntity<OcrResponse> responseEntity = restTemplate.exchange(YOUDAO_URL, HttpMethod.POST, requestEntity, OcrResponse.class);System.out.println("输出....");System.out.println(responseEntity.getBody());}public static String getDigest(String string) {if (string == null) {return null;}char hexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};byte[] btInput = string.getBytes();try {MessageDigest mdInst = MessageDigest.getInstance("SHA-256");mdInst.update(btInput);byte[] md = mdInst.digest();int j = md.length;char str[] = new char[j * 2];int k = 0;for (byte byte0 : md) {str[k++] = hexDigits[byte0 >>> 4 & 0xf];str[k++] = hexDigits[byte0 & 0xf];}return new String(str);} catch (NoSuchAlgorithmException e) {return null;}}public static String loadAsBase64(String imgFile) {File file = new File(imgFile);if (!file.exists()) {System.out.println("文件不存在");return null;}try (InputStream in = new FileInputStream(imgFile)) {byte[] data = new byte[in.available()];in.read(data);return Base64.getEncoder().encodeToString(data);} catch (IOException e) {e.printStackTrace();}return null;}public static String truncate(String q) {if (q == null) {return null;}int len = q.length();return len <= 20 ? q : (q.substring(0, 10) + len + q.substring(len - 10, len));}}