腾讯ocr图片识别接口调用

最近开发了一个拍车牌识别车牌号的功能，主要调用了腾讯的ocr车牌识别接口，直接上代码：

首先生成签名以及读取配置的工具类：

package com.weaver.formmodel.integration.ocr;

import java.util.Random;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import weaver.general.Base64;

public class SignUtil {
	/**
	 * 生成 Authorization 签名字段
	 * 
	 * @param appId
	 * @param secretId
	 * @param secretKey
	 * @param bucketName
	 * @param expired
	 * @return 签名字符串
	 * @throws Exception
	 */
	public static String appSign(long appId, String secretId, String secretKey,
			String bucketName, long expired) throws Exception {
		long now = System.currentTimeMillis() / 1000;
		int rdm = Math.abs(new Random().nextInt());
		String plainText = String.format("a=%d&b=%s&k=%s&t=%d&e=%d&r=%d",
				appId, bucketName, secretId, now, now + expired, rdm);
		byte[] hmacDigest = HmacSha1(plainText, secretKey);
		byte[] signContent = new byte[hmacDigest.length
				+ plainText.getBytes().length];
		System.arraycopy(hmacDigest, 0, signContent, 0, hmacDigest.length);
		System.arraycopy(plainText.getBytes(), 0, signContent,
				hmacDigest.length, plainText.getBytes().length);
		return Base64Encode(signContent);
	}

	/**
	 * 生成 base64 编码
	 * 
	 * @param binaryData
	 * @return
	 */
	public static String Base64Encode(byte[] binaryData) {
		String encodedstr = new String(Base64.encode(binaryData));
		return encodedstr;
	}

	/**
	 * 生成 hmacsha1 签名
	 * 
	 * @param binaryData
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static byte[] HmacSha1(byte[] binaryData, String key)
			throws Exception {
		Mac mac = Mac.getInstance("HmacSHA1");
		SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(), "HmacSHA1");
		mac.init(secretKey);
		byte[] HmacSha1Digest = mac.doFinal(binaryData);
		return HmacSha1Digest;
	}

	/**
	 * 生成 hmacsha1 签名
	 * 
	 * @param plainText
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static byte[] HmacSha1(String plainText, String key)
			throws Exception {
		return HmacSha1(plainText.getBytes(), key);
	}
}

 

package weaver.general;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.CharArrayWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;

/**
 * Provides encoding of raw bytes to base64-encoded characters, and decoding of
 * base64 characters to raw bytes. date: 06 August 1998 modified: 14 February
 * 2000 modified: 22 September 2000
 * 
 * @author Kevin Kelley ([email protected])
 * @version 1.3
 */
public class Base64 {

	/**
	 * returns an array of base64-encoded characters to represent the passed
	 * data array.
	 * 
	 * @param data
	 *            the array of bytes to encode
	 * @return base64-coded character array.
	 */
	public static char[] encode(byte[] data) {
		char[] out = new char[((data.length + 2) / 3) * 4];

		//
		// 3 bytes encode to 4 chars. Output is always an even
		// multiple of 4 characters.
		//
		for (int i = 0, index = 0; i < data.length; i += 3, index += 4) {
			boolean quad = false;
			boolean trip = false;

			int val = (0xFF & data[i]);
			val <<= 8;
			if ((i + 1) < data.length) {
				val |= (0xFF & data[i + 1]);
				trip = true;
			}
			val <<= 8;
			if ((i + 2) < data.length) {
				val |= (0xFF & data[i + 2]);
				quad = true;
			}
			out[index + 3] = alphabet[(quad ? (val & 0x3F) : 64)];
			val >>= 6;
			out[index + 2] = alphabet[(trip ? (val & 0x3F) : 64)];
			val >>= 6;
			out[index + 1] = alphabet[val & 0x3F];
			val >>= 6;
			out[index + 0] = alphabet[val & 0x3F];
		}
		return out;
	}

	/**
	 * Decodes a BASE-64 encoded stream to recover the original data. White
	 * space before and after will be trimmed away, but no other manipulation of
	 * the input will be performed.
	 * 
	 * As of version 1.2 this method will properly handle input containing junk
	 * characters (newlines and the like) rather than throwing an error. It does
	 * this by pre-parsing the input and generating from that a count of VALID
	 * input characters.
	 **/
	public static byte[] decode(char[] data) {
		// as our input could contain non-BASE64 data (newlines,
		// whitespace of any sort, whatever) we must first adjust
		// our count of USABLE data so that...
		// (a) we don't misallocate the output array, and
		// (b) think that we miscalculated our data length
		// just because of extraneous throw-away junk

		int tempLen = data.length;
		for (int ix = 0; ix < data.length; ix++) {
			if ((data[ix] > 255) || codes[data[ix]] < 0)
				--tempLen; // ignore non-valid chars and padding
		}
		// calculate required length:
		// -- 3 bytes for every 4 valid base64 chars
		// -- plus 2 bytes if there are 3 extra base64 chars,
		// or plus 1 byte if there are 2 extra.

		int len = (tempLen / 4) * 3;
		if ((tempLen % 4) == 3)
			len += 2;
		if ((tempLen % 4) == 2)
			len += 1;

		byte[] out = new byte[len];

		int shift = 0; // # of excess bits stored in accum
		int accum = 0; // excess bits
		int index = 0;

		// we now go through the entire array (NOT using the 'tempLen' value)
		for (int ix = 0; ix < data.length; ix++) {
			int value = (data[ix] > 255) ? -1 : codes[data[ix]];

			if (value >= 0)// skip over non-code
			{
				accum <<= 6; // bits shift up by 6 each time thru
				shift += 6; // loop, with new bits being put in
				accum |= value; // at the bottom.
				if (shift >= 8)// whenever there are 8 or more shifted in,
				{
					shift -= 8; // write them out (from the top, leaving any
					out[index++] = // excess at the bottom for next iteration.
					(byte) ((accum >> shift) & 0xff);
				}
			}
			// we will also have skipped processing a padding null byte ('=')
			// here;
			// these are used ONLY for padding to an even length and do not
			// legally
			// occur as encoded data. for this reason we can ignore the fact
			// that
			// no index++ operation occurs in that special case: the out[] array
			// is
			// initialized to all-zero bytes to start with and that works to our
			// advantage in this combination.
		}

		// if there is STILL something wrong we just have to throw up now!
		if (index != out.length) {
			throw new Error("Miscalculated data length (wrote " + index
					+ " instead of " + out.length + ")");
		}

		return out;
	}

	//
	// code characters for values 0..63
	//
	private static char[] alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
			.toCharArray();

	//
	// lookup table for converting base64 characters to value in range 0..63
	//
	private static byte[] codes = new byte[256];

	static {
		for (int i = 0; i < 256; i++)
			codes[i] = -1;
		for (int i = 'A'; i <= 'Z'; i++)
			codes[i] = (byte) (i - 'A');
		for (int i = 'a'; i <= 'z'; i++)
			codes[i] = (byte) (26 + i - 'a');
		for (int i = '0'; i <= '9'; i++)
			codes[i] = (byte) (52 + i - '0');
		codes['+'] = 62;
		codes['/'] = 63;
	}

	// /////////////////////////////////////////////////
	// remainder (main method and helper functions) is
	// for testing purposes only, feel free to clip it.
	// /////////////////////////////////////////////////

	public static void main(String[] args) {
		boolean decode = false;

		if (args.length == 0) {
			System.out.println("usage:  java Base64 [-d[ecode]] filename");
			System.exit(0);
		}
		for (int i = 0; i < args.length; i++) {
			if ("-decode".equalsIgnoreCase(args[i]))
				decode = true;
			else if ("-d".equalsIgnoreCase(args[i]))
				decode = true;
		}

		String filename = args[args.length - 1];
		File file = new File(filename);
		if (!file.exists()) {
			System.out
					.println("Error:  file '" + filename + "' doesn't exist!");
			System.exit(0);
		}

		if (decode) {
			char[] encoded = readChars(file);
			byte[] decoded = decode(encoded);
			writeBytes(file, decoded);
		} else {
			byte[] decoded = readBytes(file);
			char[] encoded = encode(decoded);
			writeChars(file, encoded);
		}
	}

	private static byte[] readBytes(File file) {
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		try {
			InputStream fis = new FileInputStream(file);
			InputStream is = new BufferedInputStream(fis);
			int count = 0;
			byte[] buf = new byte[16384];
			while ((count = is.read(buf)) != -1) {
				if (count > 0)
					baos.write(buf, 0, count);
			}
			is.close();
		} catch (Exception e) {
			e.printStackTrace();
		}

		return baos.toByteArray();
	}

	private static char[] readChars(File file) {
		CharArrayWriter caw = new CharArrayWriter();
		try {
			Reader fr = new FileReader(file);
			Reader in = new BufferedReader(fr);
			int count = 0;
			char[] buf = new char[16384];
			while ((count = in.read(buf)) != -1) {
				if (count > 0)
					caw.write(buf, 0, count);
			}
			in.close();
		} catch (Exception e) {
			e.printStackTrace();
		}

		return caw.toCharArray();
	}

	private static void writeBytes(File file, byte[] data) {
		try {
			OutputStream fos = new FileOutputStream(file);
			OutputStream os = new BufferedOutputStream(fos);
			os.write(data);
			os.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	private static void writeChars(File file, char[] data) {
		try {
			Writer fos = new FileWriter(file);
			Writer os = new BufferedWriter(fos);
			os.write(data);
			os.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	// /////////////////////////////////////////////////
	// end of test code.
	// /////////////////////////////////////////////////

}

package weaver.general;

import java.io.File;
import java.io.FileInputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

public class BaseBean {
	private static Map propertyMap = new HashMap();

	public String getPropValue(String cONFIG_FILE, String key) {
		if (propertyMap.get(cONFIG_FILE) == null) {
			readPro(cONFIG_FILE);
		}
		Properties pro = propertyMap.get(cONFIG_FILE);
		return pro.getProperty(key);
	}

	private void readPro(String cONFIG_FILE) {
		Properties pro = new Properties();
		FileInputStream in;
		try {
			String path = Thread.currentThread().getContextClassLoader()
					.getResource("").toString();
			path = path.substring(6, path.indexOf("classes/"));
			path = path + "prop/" + cONFIG_FILE + ".properties";
			path = path.replace("%20", " ");
			System.out.println(path);
			File f = new File(path);
			if (!f.exists()) {
				throw new RuntimeException("要读取的文件不存在");
			}
			in = new FileInputStream(f);
			pro.load(in);
			in.close();
			propertyMap.put(cONFIG_FILE, pro);
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

}

package weaver.general;

public class Util {

	public static int getIntValue(String value) {
		try {
			return Integer.parseInt(value);
		} catch (NumberFormatException e) {
			e.printStackTrace();
			return 0;
		}
		
	}

}

然后是接口调配置文件：

正主来了，调用接口部分：

package com.weaver.formmodel.integration.ocr;

import java.util.HashMap;
import java.util.Map;
import net.sf.json.JSONObject;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.CoreConnectionPNames;
import org.apache.http.util.EntityUtils;
import weaver.general.BaseBean;
import weaver.general.Util;
public class OCRClient{
	private static String CONFIG_FILE = "OCR_Tencent";
	private static String host;
	private static int appid;
	private static String secretId;
	private static String secretKey;
	private static String targeturl;
	private static String encoding = "UTF-8";

	static {
		BaseBean bb = new BaseBean();
		host = bb.getPropValue(CONFIG_FILE, "host");
		appid = Util.getIntValue(bb.getPropValue(CONFIG_FILE, "appid"));
		secretId = bb.getPropValue(CONFIG_FILE, "secretId");
		secretKey = bb.getPropValue(CONFIG_FILE, "secretKey");
		targeturl = bb.getPropValue(CONFIG_FILE, "targetUrl");
		
	}

	/**
	 * 识别图片
	 * @param imageurl
	 * @param paramsMap 参数map
	 * @return
	 * @throws Exception
	 */
	public static Map recognizeImage(Map paramsMap) throws Exception{
		HttpClient httpclient = new DefaultHttpClient();
		HttpPost httpPost = new HttpPost(targeturl);// 创建httpPost   
		httpPost.setHeader("host", host);
		//设置签名
        httpPost.setHeader("Authorization", SignUtil.appSign(appid, secretId, secretKey, "", 2592000));//设置请求头, 签名
        //设置参数
		JSONObject requestParam = new JSONObject();
		requestParam.put("appid", String.valueOf(appid));
		for(String key :paramsMap.keySet()){//循环加入请求参数
			requestParam.put(key, paramsMap.get(key));
		}
		//请求报文
        StringEntity entity = new StringEntity(requestParam.toString(), encoding);
        entity.setContentEncoding(encoding);
        entity.setContentType("application/json");//发送json数据需要设置contentType
        httpPost.setEntity(entity);
        httpPost.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 120000);
        httpPost.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, 120000);
        int state = 0;
        String result = "";
        HttpResponse response = null;
        try {
        	response = httpclient.execute(httpPost);
            StatusLine status = response.getStatusLine();
            state = status.getStatusCode();
            if (state == HttpStatus.SC_OK) {
            	HttpEntity responseEntity = response.getEntity();
            	result = EntityUtils.toString(responseEntity);
            }else{
				//new BaseBean().writeLog("读取OCR驾驶证或者行驶证接口失败，状态码:"+state);
			}
        } finally {
        	httpclient.getConnectionManager().shutdown();
        }
        Map resultMap = new HashMap();
        resultMap.put("state", state);
        resultMap.put("result", result);
        return resultMap;
	}
	
	
	//测试
	public static void main(String[] args) {
		String imgurl = "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1532414063478&di=f8709d73023a1a4ef9fe58f23ec95a8e&imgtype=jpg&src=http%3A%2F%2Fimg3.imgtn.bdimg.com%2Fit%2Fu%3D2587099383%2C4041264664%26fm%3D214%26gp%3D0.jpg";
		try {
			//车牌号识别参数设置
			Map requestParam = new HashMap();
			requestParam.put("url", imgurl);
			Map res =recognizeImage(requestParam);
			//解析车牌号返回值
			JSONObject resultJson = JSONObject.fromObject(res.get("result"));
			System.out.println(resultJson.toString());
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

如需调用其他接口，如身份证识别接口、驾驶证识别接口、等，则只需要修改一下配置文件的targeturl，并且调用时传入相应的参数即可。