H5数字识别（基于实例demo）

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扫数字识别

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博客展示了在jsp文件中编写form表单实现文件上传的代码，同时给出接收文件的ImgUpload类写法，包含文件上传配置、保存等操作。还应用百度AipOcr包进行图片文字识别，提取含数字的文字信息，需自行注册文字识别app。

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jsp文件中写form表单

接收文件ImgUpload写法：

package mapserv;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.RandomAccessFile;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.json.JSONArray;
import org.json.JSONObject;

import com.baidu.aip.ocr.AipOcr;

@WebServlet("/upload.do")
public class ImgUpload extends HttpServlet {

   private static final long serialVersionUID = 1L;

// 上传文件存储目录
private static final String UPLOAD_DIRECTORY = "upload";

// 上传配置
private static final int MEMORY_THRESHOLD = 1024 * 1024 * 3; // 3MB
private static final int MAX_FILE_SIZE = 1024 * 1024 * 40; // 40MB
private static final int MAX_REQUEST_SIZE = 1024 * 1024 * 50; // 50MB
private String fileName = new String();

//baidu识别的配置APPID/AK/SK
public static final String APP_ID = "15365978";
public static final String API_KEY = "mf7gT4pQcfro6QgbY2QTK4o5";
public static final String SECRET_KEY = "wlsNB2OVg1mtRKm5i2GAIdCu3tlK4Ini";

/**
* 上传数据及保存文件
*/
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// 检测是否为多媒体上传
if (!ServletFileUpload.isMultipartContent(request)) {
// 如果不是则停止
PrintWriter writer = response.getWriter();
writer.println("Error: 表单必须包含 enctype=multipart/form-data");
writer.flush();
return;
}

// 配置上传参数
DiskFileItemFactory factory = new DiskFileItemFactory();
// 设置内存临界值 - 超过后将产生临时文件并存储于临时目录中
factory.setSizeThreshold(MEMORY_THRESHOLD);
// 设置临时存储目录
factory.setRepository(new File(System.getProperty("java.io.tmpdir")));

ServletFileUpload upload = new ServletFileUpload(factory);

// 设置最大文件上传值
upload.setFileSizeMax(MAX_FILE_SIZE);

// 设置最大请求值 (包含文件和表单数据)
upload.setSizeMax(MAX_REQUEST_SIZE);

// 中文处理
upload.setHeaderEncoding("UTF-8");

// 构造临时路径来存储上传的文件
// 这个路径相对当前应用的目录
// String uploadPath = request.getServletContext().getRealPath("./") + File.separator + UPLOAD_DIRECTORY;
String uploadPath = "D://test/";

// 如果目录不存在则创建
File uploadDir = new File(uploadPath);
if (!uploadDir.exists()) {
uploadDir.mkdir();
}

try {
StringBuffer resultText = new StringBuffer();
// 解析请求的内容提取文件数据
@SuppressWarnings("unchecked")
List<FileItem> formItems = upload.parseRequest(request);

if (formItems != null && formItems.size() > 0) {
// 迭代表单数据
for (FileItem item : formItems) {
// 处理不在表单中的字段
if (!item.isFormField()) {
fileName = new File(item.getName()).getName();
String filePath = uploadPath + File.separator + fileName;
File storeFile = new File(filePath);
// 在控制台输出文件的上传路径
System.out.println(filePath);
// 保存文件到硬盘
item.write(storeFile);
request.setAttribute("message",
resultText);
getTextInImg(filePath,resultText);
}
}
}
} catch (Exception ex) {
request.setAttribute("message",
"");
}
// 跳转到 message.jsp
request.getServletContext().getRequestDispatcher("/upload.jsp").forward(
request, response);
}

   private void getTextInImg(String filePath,StringBuffer resultText) {
       // TODO Auto-generated method stub

       // 初始化一个AipOcr
AipOcr client = new AipOcr(APP_ID, API_KEY, SECRET_KEY);

// 可选：设置网络连接参数
client.setConnectionTimeoutInMillis(2000);
client.setSocketTimeoutInMillis(60000);

       // 传入可选参数调用接口
   HashMap<String, String> options = new HashMap<String, String>();
   options.put("detect_direction", "true");
   options.put("probability", "true");


   // 参数为本地路径
   String image = "D://test/"+fileName;
   JSONObject res = client.basicAccurateGeneral(image, options);
//   resultText.delete(0, resultText.length()-1);
   JSONArray wordResult = res.getJSONArray("words_result");
   for(int x=0;x<wordResult.length();x++) {
       String s = wordResult.getJSONObject(x).getString("words");
       boolean isDigit = false;
       for (int i = s.length();--i>=0;){
           if (Character.isDigit(s.charAt(i))){
               isDigit = true;
           }
           }
       if(isDigit) {
           resultText.append(s);
       }
   }
   System.out.println(resultText+"------");
   /* System.out.println(res.toString(2));
   System.out.println(resultText+"------");*/
/*
   // 参数为二进制数组
   byte[] file = readFile("test.jpg");
   res = client.basicAccurateGeneral(file, options);
   System.out.println(res.toString(2));*/
   }