生成验证码

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生成验证码

package com.itheima.servlet;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.image.BufferedImage;import java.io.IOException;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;/** * 验证码 * @author thinkpad * */public class servletDemo4 extends HttpServlet{    @Override    protected void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        int width=110;        int height=25;        int imageType=BufferedImage.TYPE_INT_RGB;        //在内存中创建一个图像对象        BufferedImage img=new BufferedImage(width, height, imageType);        //创建画笔        Graphics g =img.getGraphics();        //给图片添加背景颜色        g.setColor(Color.PINK);        g.fillRect(1, 1, width-2, height-2);        //添加边框颜色        g.setColor(Color.RED);        g.drawRect(0, 0, width-1, height-1);        //添加文字        g.setFont(new Font("宋体", Font.BOLD|Font.ITALIC, 15));        g.setColor(Color.BLUE);        Random rand=new Random();        int position=20;        for (int i = 0; i < 4; i++) {            g.drawString(rand.nextInt(10)+"", position, 18);            position+=20;        }        //添加9跟干扰线        for (int i = 0; i < 9; i++) {            g.drawLine(rand.nextInt(width), rand.nextInt(height), rand.nextInt(width), rand.nextInt(height));        }        //将图片以对象方式输出到客户端        ImageIO.write(img, "jpg", response.getOutputStream());    }    @Override    protected void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        doGet(request, response);    }}

login.html

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><script type="text/javascript">    function changeCode(){        var img=document.getElementsByTagName("img")[0];        img.src="/day05_1/demo2?time="+new Date().getTime();    }</script><title>Insert title here</title></head><body>    <form action="#" method="post">        用户名：<input type="text" name="userName"><br>        密码：<input type="password" name="password"><br>        验证码:<input type="text" name="code">        <img src="/day05_1/demo2"  onclick="changeCode()"><a href="javascript:changeCode()">看不清，换一张</a><br>        <input type="submit" value="提交"><br>    </form></body></html>

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