本文為大家分享了java實(shí)現(xiàn)百度云ocr識(shí)別的具體代碼，高精度ocr識(shí)別身份證信息，供大家參考，具體內(nèi)容如下
1.通用ocr文字識(shí)別
這種ocr只能按照識(shí)別圖片中的文字，且是按照行識(shí)別返回結(jié)果，精度較低。
首先引入依賴包：
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<dependency> <groupid>com.baidu.aip</groupid> <artifactid>java-sdk</artifactid> <version>4.6.0</version></dependency> |
通過(guò)ocr工具類：
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package util; import com.baidu.aip.ocr.aipocr;import org.json.jsonobject;import java.util.hashmap; public class ocrapi { private static final string app_id = "你的 app id"; private static final string api_key = "xb12m5t4js2n7"; private static final string secret_key = "9xvx9gpcsbsutz"; private static aipocr getaipclient() { return getaipclient(api_key, secret_key); } public static aipocr getaipclient(string apikey, string secretkey) { aipocr client = new aipocr(app_id, apikey, secretkey); // 可選：設(shè)置網(wǎng)絡(luò)連接參數(shù) client.setconnectiontimeoutinmillis(2000); client.setsockettimeoutinmillis(60000); return client; } public static string result(aipocr client) { // 傳入可選參數(shù)調(diào)用接口 hashmap<string, string> options = new hashmap<>(); options.put("language_type", "chn_eng"); options.put("detect_direction", "true"); options.put("detect_language", "true"); options.put("probability", "true"); jsonobject res = client.basicgeneralurl( "https://lichunyu1234.oss-cn-shanghai.aliyuncs.com/1.png", options); return res.tostring(2); } public static void main(string[] args) { system.out.println(result(getaipclient())); }} |
結(jié)果如下，識(shí)別有兩行信息（words即是識(shí)別的信息）：
2.高精度ocr識(shí)別身份證信息
這種就比較高精度，且按照分類顯示，返回?cái)?shù)據(jù)更友好，高可用。
2.1 接口說(shuō)明及請(qǐng)求參數(shù)是地址官方截圖如下：
2.2 ocr身份證識(shí)別工具類
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package util; import com.alibaba.druid.util.base64;import com.alibaba.fastjson.jsonobject;import java.io.*;import java.net.*;import java.nio.charset.standardcharsets;import java.util.list;import java.util.map; public class ocrutil { // access_token獲取 private static final string access_token_host = "https://aip.baidubce.com/oauth/2.0/token?"; // 身份證識(shí)別請(qǐng)求url private static final string ocr_host = "https://aip.baidubce.com/rest/2.0/ocr/v1/idcard?"; // apikey,secretkey private static final string api_key ="xb12m5t4js"; private static final string secret_key = "9xvx9gpcsbsut"; // 獲取百度云ocr的授權(quán)access_token public static string getaccesstoken() { return getaccesstoken(api_key, secret_key); } /** * 獲取百度云ocr的授權(quán)access_token * @param apikey * @param secretkey * @return */ public static string getaccesstoken(string apikey, string secretkey) { string accesstokenurl = access_token_host // 1. grant_type為固定參數(shù) + "grant_type=client_credentials" // 2. 官網(wǎng)獲取的 api key + "&client_id=" + apikey // 3. 官網(wǎng)獲取的 secret key + "&client_secret=" + secretkey; try { url url = new url(accesstokenurl); // 打開(kāi)和url之間的連接 httpurlconnection connection = (httpurlconnection) url.openconnection(); connection.setrequestmethod("get"); connection.connect(); // 獲取響應(yīng)頭 map<string, list<string>> map = connection.getheaderfields(); // 遍歷所有的響應(yīng)頭字段 for (string key : map.keyset()) { system.out.println(key + "---->" + map.get(key)); } // 定義 bufferedreader輸入流來(lái)讀取url的響應(yīng) bufferedreader bufferedreader = new bufferedreader(new inputstreamreader(connection.getinputstream())); stringbuilder result = new stringbuilder(); string inputline; while ((inputline = bufferedreader.readline()) != null) { result.append(inputline); } jsonobject jsonobject = jsonobject.parseobject(result.tostring()); return jsonobject.getstring("access_token"); } catch (exception e) { e.printstacktrace(); system.err.print("獲取access_token失敗"); } return null; } /** * 獲取身份證識(shí)別后的數(shù)據(jù) * @param imageurl * @param idcardside * @return */ public static string getstringidentitycard(file imageurl, string idcardside) { // 身份證ocr的http url+鑒權(quán)token string ocrurl = ocr_host+"access_token="+getaccesstoken(); system.out.println(ocrurl); system.out.println("***************************************************"); system.out.println(getaccesstoken()); // 對(duì)圖片進(jìn)行base64處理 string image = encodeimagetobase64(imageurl); // 請(qǐng)求參數(shù) string requestparam = "detect_direction=true&id_card_side="+idcardside+"&image="+image; try { // 請(qǐng)求ocr地址 url url = new url(ocrurl); httpurlconnection connection = (httpurlconnection) url.openconnection(); // 設(shè)置請(qǐng)求方法為post connection.setrequestmethod("post"); // 設(shè)置請(qǐng)求頭 connection.setrequestproperty("content-type", "application/x-www-form-urlencoded"); connection.setrequestproperty("apikey", api_key); connection.setdooutput(true); connection.getoutputstream().write(requestparam.getbytes(standardcharsets.utf_8)); connection.connect(); // 定義 bufferedreader輸入流來(lái)讀取url的響應(yīng) bufferedreader bufferedreader = new bufferedreader(new inputstreamreader(connection.getinputstream(), standardcharsets.utf_8)); stringbuilder result = new stringbuilder(); string inputline; while ((inputline = bufferedreader.readline()) != null) { result.append(inputline); } bufferedreader.close(); return result.tostring(); } catch (exception e) { e.printstacktrace(); system.err.println("身份證ocr識(shí)別異常"); return null; } } /** * 對(duì)圖片url進(jìn)行base64編碼處理 * @param imageurl * @return */ public static string encodeimagetobase64(file imageurl) { // 將圖片文件轉(zhuǎn)化為字節(jié)數(shù)組字符串，并對(duì)其進(jìn)行base64編碼處理 byte[] data = null; try { inputstream inputstream = new fileinputstream(imageurl); data = new byte[inputstream.available()]; inputstream.read(data); inputstream.close(); // 對(duì)字節(jié)數(shù)組base64編碼 return urlencoder.encode(base64.bytearraytobase64(data), "utf-8"); } catch (exception e) { e.printstacktrace(); return null; } } /** * 提取ocr識(shí)別身份證有效信息 * @param * @return */ public static map<string, string> getidcardinfo(multipartfile image, int idcardside) { string value = getstringidentitycard(image, idcardside); string side; if (idcardside == 1) { side = "正面"; }else { side = "背面"; } map<string, string> map = new hashmap<>(); jsonobject jsonobject = jsonobject.parseobject(value); jsonobject words_result = jsonobject.getjsonobject("words_result"); if (words_result == null || words_result.isempty()) { throw new myexception("請(qǐng)?zhí)峁┥矸葑C"+side+"圖片"); } for (string key : words_result.keyset()) { jsonobject result = words_result.getjsonobject(key); string info = result.getstring("words"); switch (key) { case "姓名": map.put("name", info); break; case "性別": map.put("sex", info); break; case "民族": map.put("nation", info); break; case "出生": map.put("birthday", info); break; case "住址": map.put("address", info); break; case "公民身份號(hào)碼": map.put("idnumber", info); break; case "簽發(fā)機(jī)關(guān)": map.put("issuedorganization", info); break; case "簽發(fā)日期": map.put("issuedat", info); break; case "失效日期": map.put("expiredat", info); break; } } return map; } } |
官方返回示例：
對(duì)于身份證識(shí)別有個(gè)大坑：
1.有的base64編碼后有頭部“base64：”要去掉，阿里巴巴的base64可以正常使用。
2.ocr識(shí)別官方只說(shuō)明圖片要base64編碼，但是實(shí)際上還是要再u(mài)rlencode再編碼一次才可以。
以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持服務(wù)器之家。
原文鏈接：https://blog.csdn.net/weixin_42058600/article/details/82709590
