百度OCR图片内容识别为文字详细教程

编程入门行业动态更新时间:2024-10-09 15:16:48

百度OCR图片内容识别为<a href=https://www.elefans.com/category/jswz/34/1769559.html style= 文字详细教程"/>

百度OCR图片内容识别为文字详细教程

百度OCR图片内容识别为文字

- - 一、百度OCR图片内容转换为文字
  - - 1.进入对应链接根据图片指示进行相关操作
    - 2.进入页面点击技术文档
    - 3.个人示例代码实现（仅供参考）
    - - 3.1 重要提示代码中所需工具类
      - 3.2 controller层代码（前端照片以Base64格式传输）
      - 3.3 service实现类层代码
      - 3.4 获取token的代码
  - 二、百度开发Api创建并生成API Key（新手可领取免费测试版本）
  - - 1.进入对应的创建界面
    - 2.根据需求选择相应的文字识别接口
    - 3.创建成功的资源将会显示在[资源列表]的「已领取资源」中。您可以选择「查看领取记录」去往「资源列表」查看。
    - 4.创建应用
    - - 4.1 进入文字识别控制台，**点击「去创建」**，即可进入应用创建页面。
      - 4.2 根据需要，填写完毕相应信息后，点击「立即创建」，即可完成应用的创建。应用创建完毕后，点击左侧导航中的「应用列表」，进行查看和管理。
      - 4.3 创建完的应用就可以看到API KEY以及 Secret KEY了。

一、百度OCR图片内容转换为文字

1.进入对应链接根据图片指示进行相关操作

2.进入页面点击技术文档

3.个人示例代码实现（仅供参考）

3.1 重要提示代码中所需工具类

FileUtil,Base64Util,HttpUtil,GsonUtils请从

package com.xigao.util;import java.io.*;/*** 文件读取工具类*/
public class FileUtil {/*** 读取文件内容，作为字符串返回*/public static String readFileAsString(String filePath) throws IOException {File file = new File(filePath);if (!file.exists()) {throw new FileNotFoundException(filePath);} if (file.length() > 1024 * 1024 * 1024) {throw new IOException("File is too large");} StringBuilder sb = new StringBuilder((int) (file.length()));// 创建字节输入流  FileInputStream fis = new FileInputStream(filePath);  // 创建一个长度为10240的Bufferbyte[] bbuf = new byte[10240];  // 用于保存实际读取的字节数  int hasRead = 0;  while ( (hasRead = fis.read(bbuf)) > 0 ) {  sb.append(new String(bbuf, 0, hasRead));  }  fis.close();  return sb.toString();}/*** 根据文件路径读取byte[] 数组*/public static byte[] readFileByBytes(String filePath) throws IOException {File file = new File(filePath);if (!file.exists()) {throw new FileNotFoundException(filePath);} else {ByteArrayOutputStream bos = new ByteArrayOutputStream((int) file.length());BufferedInputStream in = null;try {in = new BufferedInputStream(new FileInputStream(file));short bufSize = 1024;byte[] buffer = new byte[bufSize];int len1;while (-1 != (len1 = in.read(buffer, 0, bufSize))) {bos.write(buffer, 0, len1);}byte[] var7 = bos.toByteArray();return var7;} finally {try {if (in != null) {in.close();}} catch (IOException var14) {var14.printStackTrace();}bos.close();}}}
}

Base64Util

package com.xigao.util;/*** Base64 工具类*/
public class Base64Util {private static final char last2byte = (char) Integer.parseInt("00000011", 2);private static final char last4byte = (char) Integer.parseInt("00001111", 2);private static final char last6byte = (char) Integer.parseInt("00111111", 2);private static final char lead6byte = (char) Integer.parseInt("11111100", 2);private static final char lead4byte = (char) Integer.parseInt("11110000", 2);private static final char lead2byte = (char) Integer.parseInt("11000000", 2);private static final char[] encodeTable = new char[]{'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'};public Base64Util() {}public static String encode(byte[] from) {StringBuilder to = new StringBuilder((int) ((double) from.length * 1.34D) + 3);int num = 0;char currentByte = 0;int i;for (i = 0; i < from.length; ++i) {for (num %= 8; num < 8; num += 6) {switch (num) {case 0:currentByte = (char) (from[i] & lead6byte);currentByte = (char) (currentByte >>> 2);case 1:case 3:case 5:default:break;case 2:currentByte = (char) (from[i] & last6byte);break;case 4:currentByte = (char) (from[i] & last4byte);currentByte = (char) (currentByte << 2);if (i + 1 < from.length) {currentByte = (char) (currentByte | (from[i + 1] & lead2byte) >>> 6);}break;case 6:currentByte = (char) (from[i] & last2byte);currentByte = (char) (currentByte << 4);if (i + 1 < from.length) {currentByte = (char) (currentByte | (from[i + 1] & lead4byte) >>> 4);}}to.append(encodeTable[currentByte]);}}if (to.length() % 4 != 0) {for (i = 4 - to.length() % 4; i > 0; --i) {to.append("=");}}return to.toString();}
}

HttpUtil

package com.xigao.util;import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.HttpURLConnection;
import java.URL;
import java.util.List;
import java.util.Map;/*** http 工具类*/
public class HttpUtil {public static String post(String requestUrl, String accessToken, String params)throws Exception {String contentType = "application/x-www-form-urlencoded";return HttpUtil.post(requestUrl, accessToken, contentType, params);}public static String post(String requestUrl, String accessToken, String contentType, String params)throws Exception {String encoding = "UTF-8";if (requestUrl.contains("nlp")) {encoding = "GBK";}return HttpUtil.post(requestUrl, accessToken, contentType, params, encoding);}public static String post(String requestUrl, String accessToken, String contentType, String params, String encoding)throws Exception {String url = requestUrl + "?access_token=" + accessToken;return HttpUtil.postGeneralUrl(url, contentType, params, encoding);}public static String postGeneralUrl(String generalUrl, String contentType, String params, String encoding)throws Exception {URL url = new URL(generalUrl);// 打开和URL之间的连接HttpURLConnection connection = (HttpURLConnection) url.openConnection();connection.setRequestMethod("POST");// 设置通用的请求属性connection.setRequestProperty("Content-Type", contentType);connection.setRequestProperty("Connection", "Keep-Alive");connection.setUseCaches(false);connection.setDoOutput(true);connection.setDoInput(true);// 得到请求的输出流对象DataOutputStream out = new DataOutputStream(connection.getOutputStream());out.write(params.getBytes(encoding));out.flush();out.close();// 建立实际的连接connection.connect();// 获取所有响应头字段Map<String, List<String>> headers = connection.getHeaderFields();// 遍历所有的响应头字段for (String key : headers.keySet()) {System.err.println(key + "--->" + headers.get(key));}// 定义 BufferedReader输入流来读取URL的响应BufferedReader in = null;in = new BufferedReader(new InputStreamReader(connection.getInputStream(), encoding));String result = "";String getLine;while ((getLine = in.readLine()) != null) {result += getLine;}in.close();System.err.println("result:" + result);return result;}
}

GsonUtils

/** Copyright (C) 2017 Baidu, Inc. All Rights Reserved.*/
package com.xigao.util;import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonParseException;import java.lang.reflect.Type;/*** Json工具类.*/
public class GsonUtils {private static Gson gson = new GsonBuilder().create();public static String toJson(Object value) {return gson.toJson(value);}public static <T> T fromJson(String json, Class<T> classOfT) throws JsonParseException {return gson.fromJson(json, classOfT);}public static <T> T fromJson(String json, Type typeOfT) throws JsonParseException {return (T) gson.fromJson(json, typeOfT);}
}

3.2 controller层代码（前端照片以Base64格式传输）

package com.xigao.controller;import com.xigao.service.OcrService;
import lombok.AllArgsConstructor;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;@RequestMapping("/api")
@RestController
@AllArgsConstructor
@CrossOrigin(origins = "*")
public class OcrController {private final OcrService ocrService;@PostMapping(value = "/recognize")public String recognizeImage(@RequestParam("file") String file){// 调用OcrService中的方法进行文字识别return ocrService.recognizeText(file);}
}

3.3 service实现类层代码

package com.xigao.service.impl;/*** 重要提示代码中所需工具类* FileUtil,Base64Util,HttpUtil,GsonUtils请从* * * * * 下载*/import com.xigao.service.OcrService;
import com.xigao.util.*;
import org.springframework.stereotype.Service;import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.URLEncoder;
import java.util.Base64;/*** 通用文字识别（高精度版）*/
@Service
public class OcrServiceImpl implements OcrService {public String recognizeText(String file) {String substring = file.substring(file.lastIndexOf(",") + 1);String replace = substring.replace(" ", "+");// 请求urlString url = ".0/ocr/v1/accurate_basic";try {String imgParam = URLEncoder.encode(replace, "UTF-8");String param = "image=" + imgParam;String auth = GetTokenUtil.getAuth();// 注意这里仅为了简化编码每一次请求都去获取access_token，线上环境access_token有过期时间， 客户端可自行缓存，过期后重新获取。String accessToken = auth;String result = HttpUtil.post(url, accessToken, param);System.out.println(result);return result;} catch (Exception e) {e.printStackTrace();}return null;}
}

3.4 获取token的代码

package com.xigao.util;import org.json.JSONObject;import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.HttpURLConnection;
import java.URL;
import java.util.List;
import java.util.Map;/*** 获取权限token* @return 返回示例：* {* "access_token": "24.460da4889caad24cccdb1fea17221975.2592000.1491995545.282335-1234567",* "expires_in": 2592000* }*/
public  class GetTokenUtil {public static String getAuth() {// 官网获取的 API Key 更新为你注册的String clientId = "API Key";// 官网获取的 Secret Key 更新为你注册的String clientSecret = "Secret Key";return getAuth(clientId, clientSecret);}/*** 获取API访问token* 该token有一定的有效期，需要自行管理，当失效时需重新获取.* @param ak - 百度云官网获取的 API Key* @param sk - 百度云官网获取的 Securet Key* @return assess_token 示例：* "24.460da4889caad24cccdb1fea17221975.2592000.1491995545.282335-1234567"*/public static String getAuth(String ak, String sk) {// 获取token地址String authHost = ".0/token?";String getAccessTokenUrl = authHost// 1. grant_type为固定参数+ "grant_type=client_credentials"// 2. 官网获取的 API Key+ "&client_id=" + ak// 3. 官网获取的 Secret Key+ "&client_secret=" + sk;try {URL realUrl = new URL(getAccessTokenUrl);// 打开和URL之间的连接HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();connection.setRequestMethod("GET");connection.connect();// 获取所有响应头字段Map<String, List<String>> map = connection.getHeaderFields();// 遍历所有的响应头字段for (String key : map.keySet()) {System.err.println(key + "--->" + map.get(key));}// 定义 BufferedReader输入流来读取URL的响应BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));String result = "";String line;while ((line = in.readLine()) != null) {result += line;}/*** 返回结果示例*/System.err.println("result:" + result);JSONObject jsonObject = new JSONObject(result);String access_token = jsonObject.getString("access_token");return access_token;} catch (Exception e) {System.err.printf("获取token失败！");e.printStackTrace(System.err);}return null;}
}