【SpringBoot】整合百度文字识别

流程图

一、前期准备

1.1 打开百度智能云官网找到管理中心创建应用

全选文字识别

1.2 保存好AppId、API Key和Secret Key

1.3 找到通用场景文字识别，立即使用

1.4 根据自己需要，选择要开通的项目

二、代码编写

以通用文字识别（高精度版）为例

2.1 加依赖（pom.xml）

    <dependencies><!-- 引入Spring Boot的web starter依赖 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!-- 引入Lombok依赖 --><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><!-- 引入Spring Boot的测试依赖 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><!-- 百度人工智能依赖 --><dependency><groupId>com.baidu.aip</groupId><artifactId>java-sdk</artifactId><version>4.11.3</version></dependency><!-- okhttp --><!-- https://mvnrepository.com/artifact/com.squareup.okhttp3/okhttp --><dependency><groupId>com.squareup.okhttp3</groupId><artifactId>okhttp</artifactId><version>4.12.0</version></dependency><!-- 对象转换成json --><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.9.8</version></dependency><!-- thymeleaf模板引擎 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-thymeleaf</artifactId></dependency></dependencies>

2.2 编写yml文件

# 这是一个配置块，用于设置百度OCR服务的认证信息。
baidu:ocr: # OCR服务的配置项appId:  # 百度OCR服务的应用IDapiKey:  # 百度OCR服务的API密钥secretKey:  # 百度OCR服务的密钥spring:thymeleaf:cache: false

2.3 eneity层

package com.baiduocr.entity;import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;/*** BaiduOcrProperties类用于配置百度OCR服务的相关属性。* 该类通过@ConfigurationProperties注解与配置文件中的baidu.ocr前缀绑定，* 使得我们可以从配置文件中动态读取appId, apiKey和secretKey等属性值*/
@Data
@Configuration
@ConfigurationProperties(prefix = "baidu.ocr")
public class BaiduOcrProperties {// 百度OCR的App IDprivate String appId;// 百度OCR的API Keyprivate String apiKey;// 百度OCR的Secret Keyprivate String secretKey;
}

2.5 控制器

package com.baiduocr.controller;import com.baidu.aip.ocr.AipOcr;
import com.baiduocr.entity.BaiduOcrProperties;
import org.json.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;import okhttp3.*;/*** OcrController类负责处理OCR相关的请求。* 它利用百度OCR服务对上传的文件或文本进行识别，并返回识别结果。*/@Controller
public class OcrController {// 注入BaiduOcrProperties对象，用于获取百度OCR服务的配置信息private final BaiduOcrProperties baiduOcrProperties;// 创建一个OkHttpClient对象，用于发送HTTP请求到百度OCR服务static final OkHttpClient HTTP_CLIENT = new OkHttpClient().newBuilder().build();// 构造函数，注入BaiduOcrProperties对象，用于初始化BaiduOcrProperties对象@Autowiredpublic OcrController(BaiduOcrProperties baiduOcrProperties) {this.baiduOcrProperties = baiduOcrProperties;}@RequestMapping(value = {"/", "/ocr"})public String index() {return "ocr";}/*** 处理OCR识别请求。** @param file 用户上传的文件，将进行OCR识别。* @param model Spring模型，用于在识别后向视图传递数据。* @return 视图名称，根据识别结果决定是显示结果还是错误页面。*/@RequestMapping(value = "/doOcr")public String ocr(MultipartFile file, Model model) {try {List<String> ocrResult = performOcr(file); // 执行OCR识别model.addAttribute("ocrResult", ocrResult); // 将识别结果添加到模型中} catch (Exception e) {return "error"; // 识别失败，返回错误页面}return "ocr_result"; // 识别成功，返回结果页面}/*** 执行OCR识别操作。** @param file 需要进行OCR识别的文件。* @return 识别到的文本列表。* @throws Exception 如果识别过程中出现错误，则抛出异常。*/private List<String> performOcr(MultipartFile file) throws Exception {AipOcr client = new AipOcr(baiduOcrProperties.getAppId(), baiduOcrProperties.getApiKey(), baiduOcrProperties.getSecretKey()); // 创建百度OCR客户端// 获取Access TokenString accessToken = getAccessToken();HashMap<String, String> options = new HashMap<>(); // 设置OCR识别的选项options.put("language_type", "CHN_ENG");options.put("detect_direction", "true");options.put("detect_language", "true");options.put("probability", "true");byte[] buf = file.getBytes(); // 从文件中读取内容JSONObject res = client.basicAccurateGeneral(buf, options);  // 使用高精度接口进行通用文字识别List<String> wordsList = new ArrayList<>(); // 存储识别出的文本for (Object obj : res.getJSONArray("words_result")) { // 遍历识别结果，提取文本JSONObject jsonObj = (JSONObject) obj;wordsList.add(jsonObj.getString("words"));}return wordsList;}/*** 从百度OCR服务获取Access Token。** @return Access Token，用于身份验证。* @throws IOException 如果在获取Access Token过程中出现IO错误。*/private String getAccessToken() throws IOException {MediaType mediaType = MediaType.parse("application/x-www-form-urlencoded");RequestBody body = RequestBody.create(mediaType, "grant_type=client_credentials&client_id=" + baiduOcrProperties.getApiKey()+ "&client_secret=" + baiduOcrProperties.getSecretKey());Request request = new Request.Builder().url("https://aip.baidubce.com/oauth/2.0/token").method("POST", body).addHeader("Content-Type", "application/x-www-form-urlencoded").build();Response response = HTTP_CLIENT.newCall(request).execute(); // 发送请求，获取响应return new JSONObject(response.body().string()).getString("access_token"); // 从响应中提取Access Token}}

2.6 前端页面（thymeleaf）

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head><meta charset="UTF-8"><title>OCR识别</title>
</head>
<body><h1>上传图片进行OCR识别</h1>
<form th:action="@{/doOcr}" method="post" enctype="multipart/form-data"><input type="file" name="file" accept="image/*"><button type="submit">上传并识别</button>
</form></body>
<style>body {font-family: Arial, sans-serif;margin: 0;padding: 0;display: flex;flex-direction: column;align-items: center;background-color: #f8f9fa;}h1 {color: #343a40;margin-top: 20px;}form {margin: 20px 0;padding: 20px;border: 1px solid #dee2e6;border-radius: 5px;background-color: #fff;box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);}input[type="file"] {margin-bottom: 10px;}button {background-color: #007bff;color: white;padding: 10px 20px;border: none;border-radius: 5px;cursor: pointer;}button:hover {background-color: #0056b3;}
</style>
</html>

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head><meta charset="UTF-8"><title>OCR结果</title>
</head>
<body><h1>OCR识别结果</h1>
<div th:if="${ocrResult != null}"><ul><li th:each="word : ${ocrResult}" th:text="${word}"></li></ul>
</div>
<a href="/">返回首页</a></body>
<style>body {font-family: Arial, sans-serif;margin: 0;padding: 0;display: flex;flex-direction: column;align-items: center;background-color: #f8f9fa;}h1 {color: #343a40;margin-top: 20px;}div {margin: 20px 0;padding: 20px;border: 1px solid #dee2e6;border-radius: 5px;background-color: #fff;box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);width: 80%;max-width: 800px;}ul {list-style-type: none;padding: 0;}li {padding: 5px 0;border-bottom: 1px solid #dee2e6;}a {margin-top: 20px;color: #007bff;text-decoration: none;}a:hover {text-decoration: underline;}
</style>
</html>