请教java编程中的验证码问题：

ChiChengIT 2010-07-06 09:59:06

在注册时要输入验证码验证登录，请问那位高手能够提供一个简单的能够随即产生并实现验证的源码，最好拿来就能用的……

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lulu19881103 2010-07-21

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谢谢，学到了~~~

sun0322 2010-07-06

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<tr><td>验证码</td><td><input name="authCode" size=5><img src="../login/AuthenticationCode" alt=验证码 id=authCodeID></td><td></td></tr>

src的路径根据你的情况写

sun0322 2010-07-06

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         <!-- 验证码  --> 

  <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>



          <!-- 验证码     mapping  --> 

  <servlet-mapping>

    <servlet-name>AuthenticationCode</servlet-name>

    <url-pattern>/login/AuthenticationCode</url-pattern>

  </servlet-mapping>

sun0322 2010-07-06

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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 {

    

    }



}