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What should I do if I encounter the problem of verification code during automatic testing?

2022-07-25 21:58:00 【Xiaowu knock code】

1. Find a developer to remove the captcha or use the universal captcha

2. Use OCR Automatic identification

Use OCR Automatic identification , Generally, the recognition rate is not too high , It's still no problem to handle general simple verification codes

What we use here is Tesseract-OCR, Download address ：https://github.com/A9T9/Free-Ocr-Windows-Desktop/releases

How to use it ？

Enter the installed Directory ：

tesseract.exe test.png test -1
Insert picture description here
Prepare a web page , The verification code is used above

<html>
<head>
<title>Table test by Young</title>
</head>
<body>
 </br>
<h1> Test </h1>
 <img src="http://csujwc.its.csu.edu.cn/sys/ValidateCode.aspx?t=1">
 </br>
</body>
</html>

To identify the verification code , First, get the verification code , These two paragraphs are right The way of screenshots of page elements , First get a screenshot of the entire page

Then find the coordinates of page elements to intercept


/**
     * This method for screen shot element
     * 
     * @param driver
     * @param element
     * @param path
     * @throws InterruptedException
     */
    public static void screenShotForElement(WebDriver driver,
            WebElement element, String path) throws InterruptedException {
    
        File scrFile = ((TakesScreenshot) driver) .getScreenshotAs(OutputType.FILE); try { Point p = element.getLocation(); int width = element.getSize().getWidth(); int height = element.getSize().getHeight(); Rectangle rect = new Rectangle(width, height); BufferedImage img = ImageIO.read(scrFile); BufferedImage dest = img.getSubimage(p.getX(), p.getY(), rect.width, rect.height); ImageIO.write(dest, "png", scrFile); Thread.sleep(1000); FileUtils.copyFile(scrFile, new File(path));
        } catch (IOException e) {
    
            e.printStackTrace();
        }
    }

Intercepted element , You can call Tesseract-OCR Generate text

// use Tesseract to get strings

        Runtime rt = Runtime.getRuntime();
        rt.exec("cmd.exe /C tesseract.exe D:\\Tesseract-OCR\\test.png D:\\Tesseract-OCR\\test -1 ");

Next through java Read txt


/**
     * This method for read TXT file
     * 
     * @param filePath
     */
    public static void readTextFile(String filePath) {
    
        try {
    
            String encoding = "GBK";
            File file = new File(filePath);
            if (file.isFile() && file.exists()) {
     //  Judge whether the file exists 
                InputStreamReader read = new InputStreamReader(
                        new FileInputStream(file), encoding);//  Considering the encoding format 
                BufferedReader bufferedReader = new BufferedReader(read);
                String lineTxt = null;
                while ((lineTxt = bufferedReader.readLine()) != null) {
    
                    System.out.println(lineTxt);
                }
                read.close();
            } else {
    
                System.out.println(" The specified file could not be found ");
            }
        } catch (Exception e) {
    
            System.out.println(" Error reading file contents ");
            e.printStackTrace();
        }
    }

The overall code is as follows ：


1 package com.dbyl.tests;
  2 
  3 import java.awt.Rectangle;
  4 import java.awt.image.BufferedImage;
  5 import java.io.BufferedReader;
  6 import java.io.File;
  7 import java.io.FileInputStream;
  8 import java.io.IOException;
  9 import java.io.InputStreamReader;
 10 import java.io.Reader;
 11 import java.util.concurrent.TimeUnit;
 12 
 13 import javax.imageio.ImageIO;
 14 
 15 import org.apache.commons.io.FileUtils;
 16 import org.openqa.selenium.By;
 17 import org.openqa.selenium.OutputType;
 18 import org.openqa.selenium.Point;
 19 import org.openqa.selenium.TakesScreenshot;
 20 import org.openqa.selenium.WebDriver;
 21 import org.openqa.selenium.WebElement;
 22 
 23 import com.dbyl.libarary.utils.DriverFactory;
 24 
 25 public class TesseractTest {
    
 26 
 27     public static void main(String[] args) throws IOException,
 28             InterruptedException {
    
 29 
 30         WebDriver driver = DriverFactory.getChromeDriver();
 31         driver.get("file:///C:/Users/validation.html");
 32         driver.manage().timeouts().pageLoadTimeout(30, TimeUnit.SECONDS);
 33         WebElement element = driver.findElement(By.xpath("//img"));
 34 
 35         // take screen shot for element
 36         screenShotForElement(driver, element, "D:\\Tesseract-OCR\\test.png");
 37 
 38         driver.quit();
 39         
 40         // use Tesseract to get strings
 41         Runtime rt = Runtime.getRuntime();
 42         rt.exec("cmd.exe /C tesseract.exe D:\\Tesseract-OCR\\test.png D:\\Tesseract-OCR\\test -1 ");
 43 
 44         Thread.sleep(1000);
 45         // Read text
 46         readTextFile("D:\\Tesseract-OCR\\test.txt");
 47     }
 48 
 49     /**
 50      * This method for read TXT file
 51      * 
 52      * @param filePath
 53      */
 54     public static void readTextFile(String filePath) {
    
 55         try {
    
 56             String encoding = "GBK";
 57             File file = new File(filePath);
 58             if (file.isFile() && file.exists()) {
     //  Judge whether the file exists 
 59                 InputStreamReader read = new InputStreamReader(
 60                         new FileInputStream(file), encoding);//  Considering the encoding format 
 61                 BufferedReader bufferedReader = new BufferedReader(read);
 62                 String lineTxt = null;
 63                 while ((lineTxt = bufferedReader.readLine()) != null) {
    
 64                     System.out.println(lineTxt);
 65                 }
 66                 read.close();
 67             } else {
    
 68                 System.out.println(" The specified file could not be found ");
 69             }
 70         } catch (Exception e) {
    
 71             System.out.println(" Error reading file contents ");
 72             e.printStackTrace();
 73         }
 74     }
 75 
 76     /**
 77      * This method for screen shot element
 78      * 
 79      * @param driver
 80      * @param element
 81      * @param path
 82      * @throws InterruptedException
 83      */
 84     public static void screenShotForElement(WebDriver driver,
 85             WebElement element, String path) throws InterruptedException {
    
 86         File scrFile = ((TakesScreenshot) driver) 87 .getScreenshotAs(OutputType.FILE); 88 try { 89 Point p = element.getLocation(); 90 int width = element.getSize().getWidth(); 91 int height = element.getSize().getHeight(); 92 Rectangle rect = new Rectangle(width, height); 93 BufferedImage img = ImageIO.read(scrFile); 94 BufferedImage dest = img.getSubimage(p.getX(), p.getY(), 95 rect.width, rect.height); 96 ImageIO.write(dest, "png", scrFile); 97 Thread.sleep(1000); 98 FileUtils.copyFile(scrFile, new File(path));
 99         } catch (IOException e) {
    
100             e.printStackTrace();
101         }
102     }
103 
104 }

Finally, thank everyone who reads my article carefully , The following online link is also a very comprehensive one that I spent a few days sorting out , I hope it can also help you in need ！

Insert picture description here

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