java如何在jsp表单中插入验证码？

Question

我正在使用netbeans和mysql用java开发一个web应用程序。申请表上有一张登记表。当用户提交表单时，将执行客户端和服务器端验证

现在我想在表单中插入验证码。如何插入，以及如何检查用户是否输入了正确的验证码值

Answer 1

只要谷歌一下，你就会发现很多例子。这是第一个，很容易开始 http://www.devmanuals.com/tutorials/java/jsp/captcha.html

Answer 2

此代码正在运行：

//放入您的jsp页面

<div class="form-cont">
                        <img src="CaptchaImg.jpg" alt="image">
                    </div>
                    <div class="form-cont">
                     <input autocomplete="off"  type="text" class="captcha input-elm" tabindex="3"  
                        placeholder="Captcha Code" name="j_captcha_response" id="j_captcha_response" 
                         maxlength="4">
                    </div>

//PUT in YOUR class


 String parm = httpServletRequest.getParameter("j_captcha_response");
        String captchaKey = (String)session.getAttribute(CaptchaServlet.CAPTCHA_KEY) ;

        if(parm.equalsIgnoreCase(captchaKey)){
true
//CODE HERE
}
else{
faLSE
ERROR HERE 
}

Answer 3

请尝试reCAPTCHAhttps://developers.google.com/recaptcha/——它是一个被广泛使用的库，具有多种编程语言（包括Java/JSP）的经验证的插件——请参阅插件部分。顺便说一句，您也可以在不使用服务器端处理的情况下使用此库-请参阅“不使用插件显示”和“不使用插件验证”部分

Answer 4

您的验证码在servlet的doGet（…）中不会发生任何更改方法

package test.captcha;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class CaptchaServlet extends HttpServlet {

 protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {


    response.setContentType("image/jpg");
    /*
     * Define number characters contains the captcha image, declare global
     */
    int iTotalChars = 6;

    /*
     * Size image iHeight and iWidth, declare globl
     */
    int iHeight = 40;
    int iWidth = 150;

    /*
     * font style
     */
    Font fntStyle1 = new Font("Arial", Font.BOLD, 30);
    Font fntStyle2 = new Font("Verdana", Font.BOLD, 20);

    /*
     * Possible random characters in the image
     */
    Random randChars = new Random();
    String sImageCode = (Long.toString(Math.abs(randChars.nextLong()), 36)).substring(0, iTotalChars);

    /*
     * BufferedImage is used to create a create new image
     */
    /*
     * TYPE_INT_RGB - does not support transpatency, TYPE_INT_ARGB - support transpatency
     */
    BufferedImage biImage = new BufferedImage(iWidth, iHeight, BufferedImage.TYPE_INT_RGB);
    Graphics2D g2dImage = (Graphics2D) biImage.getGraphics();

    // Draw background rectangle and noisey filled round rectangles
    int iCircle = 15;
    //g2dImage.fillRect(0, 0, iWidth, iHeight);
    for (int i = 0; i < iCircle; i++) {
        g2dImage.setColor(new Color(randChars.nextInt(255), randChars.nextInt(255), randChars.nextInt(255)));
        int iRadius = (int) (Math.random() * iHeight / 2.0);
        int iX = (int) (Math.random() * iWidth - iRadius);
        int iY = (int) (Math.random() * iHeight - iRadius);
        //g2dImage.fillRoundRect(iX, iY, iRadius * 2, iRadius * 2,100,100);
    }
    g2dImage.setFont(fntStyle1);
    for (int i = 0; i < iTotalChars; i++) {
        g2dImage.setColor(new Color(randChars.nextInt(255), randChars.nextInt(255), randChars.nextInt(255)));
        if (i % 2 == 0) {
            g2dImage.drawString(sImageCode.substring(i, i + 1), 25 * i, 24);
        } else {
            g2dImage.drawString(sImageCode.substring(i, i + 1), 25 * i, 35);
        }
    }

    /*
     * create jpeg image and display on the screen
     */
    OutputStream osImage = response.getOutputStream();
    ImageIO.write(biImage, "jpeg", osImage);
    //osImage.close();

    /*
     * Dispose function is used destory an image object
     */
    g2dImage.dispose();

    HttpSession session = request.getSession();
    session.setAttribute("dns_security_code", sImageCode);
    //System.out.println("Captcha Page :"+session.getAttribute("dns_security_code"));

}



protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }


}

如果不存在，则创建web应用程序描述符：/web-INF/web。xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">

<servlet>
        <servlet-name>CaptchaServlet</servlet-name>
        <servlet-class>test.captcha.CaptchaServlet</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>CaptchaServlet</servlet-name>
    <url-pattern>/captcha-image.jpg</url-pattern>
</servlet-mapping>
</web-app>

Answer 5

下面是示例代码。希望能有帮助

http://captchas.net/sample/jsp/