java实现身份证识别

第一步：准备工作

我们这里调用的是百度的身份证识别api，我们可以在百度的api里申请这个api权限每天有500次调用机会
网站申请地址：https://ai.baidu.com/ 需要用到我们的API Key Secret Key 请保存好

第二部：Java后端编写代码并解析数据

@RequestMapping(value = "getCardMessage",method = RequestMethod.POST)
	@ResponseBody
	public String baiDuCard(@RequestBody String file){
		String auth = BaiDuCardIdentification.getAuth("API Key","Secret Key");//获取access_token
		
		JSONObject parseObject = JSONObject.parseObject(file);//将字符串转换为json对象
		Object object = parseObject.get("direction"); //获取你上传的身份证是照片面还是国徽面 front 照片面 back 国徽面
		//照片面和国徽面百度返回的数据是不一样的  要注意 做好数据的解析
		if (object.toString().equals("front")) {//比较如果是照片面进行处理数据
		   //识别身份证信息  是要传入的两个参数  一个是access_token  另一个是文件的路径 
			String idcard = BaiDuCardIdentification.idcard(auth, parseObject.get("file").toString());
			JSONObject parse =  JSONObject.parseObject(idcard); //将百度返回给我们的身份证信息 转换为json对象
			String idcard_number_type = parse.get("idcard_number_type").toString();//获取idcard_number_type判断身份证是否合法

			if (idcard.contains("edit_tool")) {//如果你的身份证图片被修改过  会返回这个字段  值为哪一个软件编辑过
				return ResultJsonData.resultFailed("身份证被"+parse.get("edit_tool").toString()+"编辑过,请重新上传");	
			}
			  if (parse.get("image_status").toString().equals("non_idcard")) {//判断你上传的这张图片是否是个身份证图片
				   return ResultJsonData.resultFailed("身份证不合格,请上传身份证照片面图片");
			}
			if (idcard_number_type.equals("1")) {//只有idcard_number_type值为1的时候是合格的  其他的均为不合格
				return ResultJsonData.resultData(0, "身份证识别成功",parse);
			}
			   //身份证不合格的就返回它的错误码  可以到官方文档查看具体的错误类型
				return ResultJsonData.resultFailed("身份证不合法错误码为:"+idcard_number_type);
			
		}
		
		if (object.toString().equals("back")) {//比较如果是国徽面进行处理数据
		//识别身份证信息  是要传入的两个参数  一个是access_token  另一个是文件的路径 
			String idcard = BaiDuCardIdentification.idcard(auth, parseObject.get("file").toString());
			JSONObject parse =  JSONObject.parseObject(idcard);//将百度返回给我们的身份证信息 转换为json对象
			   if (parse.get("image_status").toString().equals("non_idcard")) {//判断你上传的这张图片是否是个身份证图片
				   return ResultJsonData.resultFailed("身份证不合格,请上传身份证国徽面图片");
			}
				return ResultJsonData.resultData(0,"身份证识别成功",parse);
		}
		
		return null;


	}

接口使用到的方法：(对方法进行了分离）

   public static String idcard(String accessToken,String filePath) {
	        // 请求url
	        String url = "https://aip.baidubce.com/rest/2.0/ocr/v1/idcard";
	        try {
	            // 本地文件路径
	            byte[] imgData = FileUtil.readFileByBytes(filePath); //转换为字节
	            String imgStr = Base64Util.encode(imgData);//对图片进行base64的编码
	            String imgParam = URLEncoder.encode(filePath, "UTF-8");//对图片路径进行url编码  是必须的
               //detect_risk默认为false不验证身份证的真伪,值为true的时候验证身份证的真伪
	            String param = "id_card_side=" + "front" + "&url=" + imgParam+"&detect_risk="+"true"; 
	            String result = HttpUtil.post(url, accessToken, param); //用到的工具类 
	            System.out.println(result);
	            return result;
	        } catch (Exception e) {
	        	return ResultJsonData.resultFailed("身份证识别次数没有了,请联系管理员");
	        }
	       
	    }
	    public static String getAuth(String ak, String sk) {
	        // 获取token地址
	        String authHost = "https://aip.baidubce.com/oauth/2.0/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");//设置请求方式
	            connection.connect();//发送url
	            // 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
	             */
	           
	            JSONObject jsonObject = new JSONObject(result);
	            String access_token = jsonObject.getString("access_token");
	            return access_token;
	        } catch (Exception e) {
	        	return ResultJsonData.resultFailed("获取token失败");
	        }
	      
	    }

java用到的工具类

JSON 工具类

package com.zhonggu.crm.utils.BaiDu;

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);
    }
}

http 工具类

package com.zhonggu.crm.utils.BaiDu;

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;
    }
}

文件读取 工具类

package com.zhonggu.crm.utils.BaiDu;

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Buffer
        byte[] 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();
            }
        }
    }
}

Base64转换 工具类

package com.zhonggu.crm.utils.BaiDu;

/**
 * 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();
    }
}

前端调用接口

HTML

 //这里只是为了测试数据 页面有点low
<html>
	<head>
		<title>dsfsaf</title>
	</head>
	<body>
		<form action="https://localhost/getCardMessage" method="post" enctype=multipart/form-data>
			<input type="text" name="file" /> //这里输入我们的身份证图片地址  
			<input type="text" name="direction" value="front"  hidden/>//照片面传入front 国徽面传入back
			<button type="submit">上传</button>
		</form>
	</body>
</html>

页面调用返回的结果 这里只是照片面的数据

国徽面返回的结果

{“words_result”:{“失效日期”:{“words”:“20271106”,“location”:{“top”:394,“left”:100,“width”:24,“height”:104}},“签发机关”:{“words”:“辽阳市*局白塔*”,“location”:{“top”:282,“left”:144,“width”:27,“height”:200}},“签发日期”:{“words”:“20171106”,“location”:{“top”:282,“left”:98,“width”:24,“height”:100}}},“log_id”:1349655879124779008,“risk_type”:“normal”,“words_result_num”:3,“image_status”:“reversed_side”}

本文地址：https://blog.csdn.net/weixin_51591918/article/details/112621245