图片验证码识别技术_geturlimg-优快云博客

本文链接：https://blog.youkuaiyun.com/wpplvhq/article/details/6948226

这段代码展示了如何使用Jacob库来识别图片验证码。首先，通过`getUrlImg`方法从指定URL下载图片到本地，然后调用`getCode`方法读取图片文件并使用Jacob的Dispatch接口进行识别。

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import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

import com.jacob.com.Dispatch;

public class ImgCheck {

public static String getCode(String imagePath){
   com.jacob.com.Dispatch captcha = new com.jacob.com.Dispatch("Captchio.cCaptcha");
   System.out.println("加载识别数据：" + Dispatch.call(captcha,"OpenCharDB", "c:/jsask.cdb"));
   String imginfo=Dispatch.call(captcha,"GetStringFromFile",imagePath,1).toString(); //识别图片内容
   System.out.print("图片内容"+imginfo);
   return imginfo;
}

     public static void getUrlImg(String URLName, String target)
   throws Exception {// URLName照片地址
// target 本地地址
  int HttpResult = 0; // 服务器返回的状态
  URL url = new URL(URLName); // 创建URL
  URLConnection urlconn = url.openConnection(); // 试图连接并取得返回状态码
  urlconn.connect();
  HttpURLConnection httpconn = (HttpURLConnection) urlconn;
  HttpResult = httpconn.getResponseCode();
  //System.out.println(HttpResult);
  if (HttpResult != HttpURLConnection.HTTP_OK) // 不等于HTTP_OK说明连接不成功
   System.out.print("fail");
  else {
   int filesize = urlconn.getContentLength(); // 取数据长度
   //System.out.println(filesize);
   BufferedInputStream bis = new BufferedInputStream(urlconn
     .getInputStream());
   BufferedOutputStream bos = new BufferedOutputStream(
     new FileOutputStream(target));
   byte[] buffer = new byte[1024]; // 创建存放输入流的缓冲
   int num = -1; // 读入的字节数
   while (true) {
    num = bis.read(buffer); // 读入到缓冲区
    if (num == -1) {
     bos.flush();
     break; // 已经读完
    }
    bos.flush();
    bos.write(buffer, 0, num);
   }

   bos.close();
   bis.close();
  }
}

    public static void main(String args[]) {
    System.out.println(System.getProperty("java.library.path"));
  try {
   try {
    ImgCheck.getUrlImg("XXX",
      "C:/test.jpg");
    getCode("C:/test.jpg");
   } catch (Exception e) {
    e.printStackTrace();
   }
  } catch (Exception e) {
   e.printStackTrace();
  }
}
}