調(diào)用百度OCR文字識(shí)別的接口，來(lái)自于百度官網(wǎng)，親測(cè)可以使用

• 跳轉(zhuǎn)鏈接
• FileUtil的下載鏈接
• Base64Util下載鏈接
• HttpUtil下載鏈接
• GsonUtils下載鏈接
• Accurate.java文件

package com.baidu.ai.aip;import com.baidu.ai.aip.utils.Base64Util; import com.baidu.ai.aip.utils.FileUtil; import com.baidu.ai.aip.utils.HttpUtil;import java.net.URLEncoder;/** * 通用文字識(shí)別（高精度含位置版） */ public class Accurate {/*** 重要提示代碼中所需工具類* FileUtil,Base64Util,HttpUtil,GsonUtils請(qǐng)從* https://ai.baidu.com/file/658A35ABAB2D404FBF903F64D47C1F72* https://ai.baidu.com/file/C8D81F3301E24D2892968F09AE1AD6E2* https://ai.baidu.com/file/544D677F5D4E4F17B4122FBD60DB82B3* https://ai.baidu.com/file/470B3ACCA3FE43788B5A963BF0B625F3* 下載*/public static String accurate() {// 請(qǐng)求urlString url = "https://aip.baidubce.com/rest/2.0/ocr/v1/accurate";try {// 本地文件路徑String filePath = "[本地文件路徑]";byte[] imgData = FileUtil.readFileByBytes(filePath);String imgStr = Base64Util.encode(imgData);String imgParam = URLEncoder.encode(imgStr, "UTF-8");String param = "image=" + imgParam;// 注意這里僅為了簡(jiǎn)化編碼每一次請(qǐng)求都去獲取access_token，線上環(huán)境access_token有過(guò)期時(shí)間， 客戶端可自行緩存，過(guò)期后重新獲取。String accessToken = "[調(diào)用鑒權(quán)接口獲取的token]";String result = HttpUtil.post(url, accessToken, param);System.out.println(result);return result;} catch (Exception e) {e.printStackTrace();}return null;}public static void main(String[] args) {Accurate.accurate();} }

所需要的4個(gè)文件具體內(nèi)容

• FileUtil

package com.example;import java.io.*;/*** 文件讀取工具類*/ public class FileUtil {/*** 讀取文件內(nèi)容，作為字符串返回*/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()));// 創(chuàng)建字節(jié)輸入流 FileInputStream fis = new FileInputStream(filePath); // 創(chuàng)建一個(gè)長(zhǎng)度為10240的Bufferbyte[] bbuf = new byte[10240]; // 用于保存實(shí)際讀取的字節(jié)數(shù) int hasRead = 0; while ( (hasRead = fis.read(bbuf)) > 0 ) { sb.append(new String(bbuf, 0, hasRead)); } fis.close(); return sb.toString();}/*** 根據(jù)文件路徑讀取byte[] 數(shù)組*/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.example;/*** Base64 工具類*/ 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.example;import java.io.BufferedReader; import java.io.DataOutputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import java.util.List; import java.util.Map;/*** http 工具類*/ 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);// 打開(kāi)和URL之間的連接HttpURLConnection connection = (HttpURLConnection) url.openConnection();connection.setRequestMethod("POST");// 設(shè)置通用的請(qǐng)求屬性connection.setRequestProperty("Content-Type", contentType);connection.setRequestProperty("Connection", "Keep-Alive");connection.setUseCaches(false);connection.setDoOutput(true);connection.setDoInput(true);// 得到請(qǐng)求的輸出流對(duì)象DataOutputStream out = new DataOutputStream(connection.getOutputStream());out.write(params.getBytes(encoding));out.flush();out.close();// 建立實(shí)際的連接connection.connect();// 獲取所有響應(yīng)頭字段Map<String, List<String>> headers = connection.getHeaderFields();// 遍歷所有的響應(yīng)頭字段for (String key : headers.keySet()) {System.err.println(key + "--->" + headers.get(key));}// 定義 BufferedReader輸入流來(lái)讀取URL的響應(yīng)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添加會(huì)報(bào)錯(cuò)，刪除不影響最后的結(jié)果
• 整體布局和結(jié)果如下圖所示

• 拷貝輸出的結(jié)果，打開(kāi)在線Json工具

總結(jié)

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