验证码的代码如何写

你要用什么写？js和java一些都可以写的

公司一般使用java 还是js呀

用开源工具吧 jCaptcha, patcha 都是非常优秀的！

最简单的就是设置<td><%=code%></td>这个td的背景颜色为一个模糊的验证码图片数字不要数字可以直接在前台通过随机数方法生成验证过程可以放在前台后台都可以

http://blog.csdn.net/zxingchao2009/archive/2010/08/17/5819411.aspx验证码可以用servlet来生成，详细请参考上面的

我用过java的，这个关注一下。

jCaptcha 和 patcha 都是 Java 的啊jCaptcha: http://jcaptcha.sourceforge.net/
jCaptcha 中 Gmail 式的验证码：
patcha: http://code.google.com/p/patchca/
我比较喜欢这个，比 jCaptcha 小巧，也没那么花哨，这是示例：

纠正一下是 patchca，不是 patcha，呵呵

//验证码package com.user;import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.*;
import java.awt.image.*;
import java.util.*;
import javax.imageio.*;
public class Image extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse res ) throws ServletException, IOException {
//res.setContentType("text/html");
//res.getOutputStream().print("hello");

//设置页面不缓存
res.setHeader("Pragma","No-cache");
res.setHeader("Cache-Control","no-cache");
res.setDateHeader("Expires", 0);
//定义图像宽度和高度
int width = 85;
int height = 20;
//创建图片
BufferedImage img = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB); Graphics g = img.getGraphics();

Random random = new Random(); //底色
g.setColor(getRandColor(200,250));
g.fillRect(0,0,width,height);
//字体
g.setFont(new Font("华文彩云",Font.PLAIN,18));

g.setColor(getRandColor(160,200));
//干扰码
for (int i=0;i<155;i++)
{
         int x = random.nextInt(width);
          int y = random.nextInt(height);
          int xl = random.nextInt(12);
          int yl = random.nextInt(12);
          g.drawLine(x,y,x+xl,y+yl);
}
String sRand="";
for (int i=0;i<6;i++){
      String rand=String.valueOf(random.nextInt(10));
      sRand+=rand;

      g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
      g.drawString(rand,13*i+6,16);
}
HttpSession session = request.getSession(true);
session.setAttribute("rand",sRand);
session.setMaxInactiveInterval(900);
g.dispose();
ImageIO.write(img, "JPEG", res.getOutputStream()); }
public void doPost(HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException {
doGet(request,response );
}
//取得随机颜色
public Color getRandColor(int fc , int bc){
Random random = new Random();
if(fc > 255) {
fc = 255 ;
}
if (bc > 255) {
bc = 255;
}
int r = fc+random.nextInt(bc-fc);
int g = fc+random.nextInt(bc-fc);
int b = fc+random.nextInt(bc-fc);
return new Color(r,g,b);
}
}

Java code
package com.city.sxzlc.servlet;import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
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;public class AuthenticationCode extends HttpServlet {
    public AuthenticationCode() {
        super();
    }
    public void destroy() {
        super.destroy(); // Just puts "destroy" string in log
        // Put your code here
    }
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {         //验证码
        int width=70;
        int height=20;
        Integer[] a = new Integer[4];
        String randStr="";
        Random random = new Random();
        Color c = new Color(34,56,78);
        for(int i=0;i<4;i++)
            a[i] = random.nextInt(10);
        for(Integer ele:a)
            randStr+=ele;
        System.out.println(randStr);


        try{
        response.setContentType("image/jpeg");
        OutputStream out = response.getOutputStream();
        BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_3BYTE_BGR); //feredImage(int width, int height, int imageType)
        Graphics g = image.getGraphics();
        g.fillRect(1, 1, width, height);
        g.setColor(c);

        int i=5;
        i=5+random.nextInt(20);
        for(Integer ele:a) {//一个一个画
            g.drawString(ele.toString(), i+random.nextInt(5), 10+random.nextInt(10));
            i=i+8;
        }

        ImageIO.write(image, "jpeg", out);
        }catch(Exception e){e.printStackTrace();}
        request.getSession().setAttribute("authCode", randStr);
    }
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {        this.doGet(request, response);
    }
    public void init() throws ServletException {

    }}

<servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>AuthenticationCode</servlet-name>
    <servlet-class>com.city.sxzlc.servlet.AuthenticationCode</servlet-class>
  </servlet>          
  <servlet-mapping>
    <servlet-name>AuthenticationCode</servlet-name>
    <url-pattern>/login/AuthenticationCode</url-pattern>
  </servlet-mapping>

调试易

验证码的代码如何写

解决方案 »