java 提取图片中的文字，手写文字

package org.fh.util;

import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;

/**
 * 说明：获取文字识别token类
 * from：www.fhadmin.org
 */
public class AuthTextService {

    /**
     * 获取权限token
     * @return 返回示例：
     * {
     * "access_token": "24.460da4889caad24cccdb1fea17221975.2592000.1491995545.282335-1234567",
     * "expires_in": 2592000
     * }
     */
    public static String getAuth() {
        // 官网获取的 API Key 更新为你注册的
        String clientId = "xxxxx;
        // 官网获取的 Secret Key 更新为你注册的
        String clientSecret = "xxxxx";
        return getAuth(clientId, clientSecret);
    }

    /**
     * 获取API访问token
     * 该token有一定的有效期，需要自行管理，当失效时需重新获取.
     * @param ak - 百度云官网获取的 API Key
     * @param sk - 百度云官网获取的 Securet Key
     * @return assess_token 示例：
     * "24.460da4889caad24cccdb1fea17221975.2592000.1491995545.282335-1234567"
     */
    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");
            connection.connect();
            // 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
             */
            System.err.println("result:" + result);
            JSONObject jsonObject = new JSONObject(result);
            String access_token = jsonObject.getString("access_token");
            return access_token;
        } catch (Exception e) {
            System.err.printf("获取token失败！");
            e.printStackTrace(System.err);
        }
        return null;
    }

}

package org.fh.util;

import java.net.URLEncoder;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

/**
 * 说明：手写文字识别
 * from：www.fhadmin.org
 */
public class Handwriting {

    /**
     * @param imgBase64Str
     * @param accessToken
     * @return
     */
    public static String handwriting(String imgBase64Str, String accessToken) {
    	
        String url = "https://aip.baidubce.com/rest/2.0/ocr/v1/handwriting";	 //请求url
        try {
            String imgParam = URLEncoder.encode(imgBase64Str, "UTF-8");
            String param = "image=" + imgParam;
            String result = HttpUtil.post(url, accessToken, param);
            JSONObject jsonMsg = JSONObject.fromObject(result);
            int words_result_num = Integer.parseInt(jsonMsg.getString("words_result_num"));	//识别结果数，表示words_result的元素个数
            if(words_result_num > 0) {
            	StringBuffer strb = new StringBuffer();
            	JSONArray jsonArray= jsonMsg.getJSONArray("words_result");
            	for(int i=0;i<jsonArray.size();i++){
                    JSONObject object = jsonArray.getJSONObject(i);
                    String words = object.getString("words");
                    strb.append(words);
                    strb.append("\r\n");
                }
            	result = strb.toString();
            }else {
            	result = "null";
            }
            return result;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
        
    }

}