本文为大家分享了java实现百度云ocr识别的具体代码,高精度ocr识别身份证信息,供大家参考,具体内容如下
1.通用ocr文字识别
这种ocr只能按照识别图片中的文字,且是按照行识别返回结果,精度较低。
首先引入依赖包:
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<dependency>
<groupid>com.baidu.aip</groupid>
<artifactid>java-sdk</artifactid>
<version> 4.6 . 0 </version>
</dependency>
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通过ocr工具类:
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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);
// 可选:设置网络连接参数
client.setconnectiontimeoutinmillis( 2000 );
client.setsockettimeoutinmillis( 60000 );
return client;
}
public static string result(aipocr client) {
// 传入可选参数调用接口
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()));
}
}
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结果如下,识别有两行信息(words即是识别的信息):
2.高精度ocr识别身份证信息
这种就比较高精度,且按照分类显示,返回数据更友好,高可用。
2.1 接口说明及请求参数是地址官方截图如下:
2.2 ocr身份证识别工具类
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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获取
private static final string access_token_host = "https://aip.baidubce.com/oauth/2.0/token?" ;
// 身份证识别请求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" ;
// 获取百度云ocr的授权access_token
public static string getaccesstoken() {
return getaccesstoken(api_key, secret_key);
}
/**
* 获取百度云ocr的授权access_token
* @param apikey
* @param secretkey
* @return
*/
public static string getaccesstoken(string apikey, string secretkey) {
string accesstokenurl = access_token_host
// 1. grant_type为固定参数
+ "grant_type=client_credentials"
// 2. 官网获取的 api key
+ "&client_id=" + apikey
// 3. 官网获取的 secret key
+ "&client_secret=" + secretkey;
try {
url url = new url(accesstokenurl);
// 打开和url之间的连接
httpurlconnection connection = (httpurlconnection) url.openconnection();
connection.setrequestmethod( "get" );
connection.connect();
// 获取响应头
map<string, list<string>> map = connection.getheaderfields();
// 遍历所有的响应头字段
for (string key : map.keyset()) {
system.out.println(key + "---->" + map.get(key));
}
// 定义 bufferedreader输入流来读取url的响应
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( "获取access_token失败" );
}
return null ;
}
/**
* 获取身份证识别后的数据
* @param imageurl
* @param idcardside
* @return
*/
public static string getstringidentitycard(file imageurl, string idcardside) {
// 身份证ocr的http url+鉴权token
string ocrurl = ocr_host+ "access_token=" +getaccesstoken();
system.out.println(ocrurl);
system.out.println( "***************************************************" );
system.out.println(getaccesstoken());
// 对图片进行base64处理
string image = encodeimagetobase64(imageurl);
// 请求参数
string requestparam = "detect_direction=true&id_card_side=" +idcardside+ "&image=" +image;
try {
// 请求ocr地址
url url = new url(ocrurl);
httpurlconnection connection = (httpurlconnection) url.openconnection();
// 设置请求方法为post
connection.setrequestmethod( "post" );
// 设置请求头
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();
// 定义 bufferedreader输入流来读取url的响应
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( "身份证ocr识别异常" );
return null ;
}
}
/**
* 对图片url进行base64编码处理
* @param imageurl
* @return
*/
public static string encodeimagetobase64(file imageurl) {
// 将图片文件转化为字节数组字符串,并对其进行base64编码处理
byte [] data = null ;
try {
inputstream inputstream = new fileinputstream(imageurl);
data = new byte [inputstream.available()];
inputstream.read(data);
inputstream.close();
// 对字节数组base64编码
return urlencoder.encode(base64.bytearraytobase64(data), "utf-8" );
} catch (exception e) {
e.printstacktrace();
return null ;
}
}
/**
* 提取ocr识别身份证有效信息
* @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( "请提供身份证" +side+ "图片" );
}
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 "性别" :
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 "公民身份号码" :
map.put( "idnumber" , info);
break ;
case "签发机关" :
map.put( "issuedorganization" , info);
break ;
case "签发日期" :
map.put( "issuedat" , info);
break ;
case "失效日期" :
map.put( "expiredat" , info);
break ;
}
}
return map;
}
}
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官方返回示例:
对于身份证识别有个大坑:
1.有的base64编码后有头部“base64:”要去掉,阿里巴巴的base64可以正常使用。
2.ocr识别官方只说明图片要base64编码,但是实际上还是要再urlencode再编码一次才可以。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/weixin_42058600/article/details/82709590