无法在注册表的img标记中加载captcha.jsp

我正在为我的注册表执行验证码。当我的页面加载时，我不知道为什么我的验证码没有加载（显示）

我正在使用img标签显示我的captch:->

。 但同样的验证码，当我通过facebox访问它时，它就会出现。我知道为什么会这样

如果可以的话，请帮助我

-谢谢

index.jsp

登记表
名称
电子邮件
电话号码
代码
输入代码
所需字段
请注意：密码将通过电子邮件发送到提供的邮件Id。

captcha.jsp

---

将jsp转换为servlet

jsp是创建标记文件的好选择，如果添加不必要的内容，标记文件不会中断 文件中的空白

您的验证码在servlet的doGet（…）方法中不会发生任何更改

package test.captcha；
导入java.awt.Color；
导入java.awt.Font；
导入java.awt.Graphics2D；
导入java.awt.image.buffereImage；
导入java.io.IOException；
导入java.io.OutputStream；
导入java.util.Random；
导入javax.imageio.imageio；
导入javax.servlet.ServletException；
导入javax.servlet.http.HttpServlet；
导入javax.servlet.http.HttpServletRequest；
导入javax.servlet.http.HttpServletResponse；
导入javax.servlet.http.HttpSession；
公共类CaptchaServlet扩展了HttpServlet{
受保护的void processRequest（HttpServletRequest请求、HttpServletResponse响应）
抛出ServletException、IOException{
response.setContentType（“image/jpg”）；
/*
*定义包含验证码图像的数字字符，声明全局
*/
int-iTotalChars=6；
/*
*大小图像iHeight和iWidth，声明globl
*/
int-iHeight=40；
国际宽度=150；
/*
*字体样式
*/
Font fntStyle1=新字体（“Arial”，Font.BOLD，30）；
Font fntStyle2=新字体（“Verdana”，Font.BOLD，20）；
/*
*图像中可能的随机字符
*/
Random randChars=新的Random（）；
字符串sImageCode=（Long.toString（Math.abs（randChars.nextLong（）），36））.substring（0，iTotalChars）；
/*
*BuffereImage用于创建新映像
*/
/*
*类型_INT_RGB-不支持Transatency，类型_INT_ARGB-支持Transatency
*/
BuffereImage biImage=新的BuffereImage（iWidth、iHeight、BuffereImage.TYPE_INT_RGB）；
Graphics2D g2dImage=（Graphics2D）biImage.getGraphics（）；
//绘制背景矩形和充满噪音的圆形矩形
int iCircle=15；
//g2dImage.fillRect（0,0，iWidth，iHeight）；
for（int i=0；i

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>

卡普查瑟夫莱特
test.captcha.captcharvlet
卡普查瑟夫莱特
/captcha-image.jpg

如果您已经在使用Struts，为什么不将captcha生成作为servlet实现呢？这将使调试更加容易。这工作正常。当我将上面的代码上传到服务器时，它也可以正常工作。它在我的本地主机服务器中显示错误。根据web servlet容器的配置方式，只要生成某种标记（html、xml等），JSP中就会出现一些意外的空白，这没有问题。但是，对于生成二进制内容来说，JSP并不是一个完美的选择，因为二进制文件中一个意外的空白可能会使它变得无用。

<%--
        Document   : captcha
        Created on : 23 Jan, 2012, 2:23:50 PM
        Author     : Ashutosh
    --%>


    <%@ page import="java.util.*, java.io.*,java.awt.*,java.awt.image.*,javax.imageio.*,java.awt.geom.*"%>
    <%
     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();

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


    %>

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);
    }


}

<?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>