JSP生成验证码

来源：互联网发布：mysql 5.7 安装编辑：程序博客网时间：2024/04/30 19:42

验证码生成Servlet：

package entity;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.image.BufferedImage;import java.io.IOException;import java.io.PrintWriter;import static java.lang.Math.random;import java.util.Random;import javax.imageio.ImageIO;import javax.servlet.ServletException;import javax.servlet.ServletOutputStream;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * * @author ding */@WebServlet(name = "identifyCode", urlPatterns = {"/checkcode"})public class identifyCode extends HttpServlet {    /**     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>     * methods.     *     * @param request servlet request     * @param response servlet response     * @throws ServletException if a servlet-specific error occurs     * @throws IOException if an I/O error occurs     */    protected void processRequest(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        response.setContentType("text/html;charset=UTF-8");        PrintWriter out = response.getWriter();        try {            /* TODO output your page here. You may use following sample code. */            out.println("<!DOCTYPE html>");            out.println("<html>");            out.println("<head>");            out.println("<title>Servlet identifyCode</title>");            out.println("</head>");            out.println("<body>");            out.println("<h1>Servlet identifyCode at " + request.getContextPath() + "</h1>");            out.println("</body>");            out.println("</html>");        } finally {            out.close();        }    }    public static final char[] table            = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',                'A', 'B', 'C', 'D', 'E', 'F', 'G',                'H', 'I', 'J', 'K', 'L', 'M', 'N',                'O', 'P', 'Q', 'R', 'S', 'T',                'U', 'V', 'W', 'X', 'Y', 'Z'};    public static Random random = new Random();    //随机生成一个字符;    public static String getRandomString() {        StringBuffer buf = new StringBuffer();        buf.append(table[random.nextInt(table.length)]);        return buf.toString();    }        public static Color getRandomColor(int fc, int bc) {        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);    }    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">    /**     * Handles the HTTP <code>GET</code> method.     *     * @param request servlet request     * @param response servlet response     * @throws ServletException if a servlet-specific error occurs     * @throws IOException if an I/O error occurs     */    @Override    protected void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        response.setContentType("image/jpeg");        Font myFont = new Font("Arial Black", Font.PLAIN, 16);        int width = 100, height = 30;        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);        Graphics g = image.getGraphics();        random = new Random();        g.setColor(getRandomColor(200, 250));        g.fillRect(1, 1, width - 1, height - 1);        g.setColor(new Color(102, 102, 102));        g.drawRect(0, 0, width - 1, height - 1);        g.setFont(myFont);        g.setColor(getRandomColor(150, 200));                for (int i = 0; i < 150; i++) {            int x = random.nextInt(width - 1);            int y = random.nextInt(height - 1);            int x1 = random.nextInt(6) + 1;            int y1 = random.nextInt(12) + 1;            g.drawLine(x, y, x + x1, y + y1);        }        for (int i = 0; i < 70; i++) {            int x = random.nextInt(width - 1);            int y = random.nextInt(height - 1);            int x1 = random.nextInt(12) + 1;            int y1 = random.nextInt(6) + 1;            g.drawLine(x, y, x - x1, y - y1);        }        String str = "";        for (int i = 0; i < 4; i++) {            String temp = getRandomString();            str += temp;            g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));            g.drawString(temp, 15 * i + 20, 20);        }        request.getSession().setAttribute("str", str);        g.dispose();      //  ServletOutputStream out = response.getOutputStream();        ImageIO.write(image, "JPEG", response.getOutputStream());       // out.flush();    }

验证码页面：

<%@page contentType="text/html" pageEncoding="UTF-8"%><!DOCTYPE html><html>    <head>        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">        <title>JSP Page</title>        <script type="text/javascript">            function reloadImage() {                document.getElementById("Img").src = 'checkcode?now=' + new Date().getTime();            }        </script>        <style>            .one{                position: absolute;                top:30%;                left:30%;            }        </style>       </head>    <body>            <div class="one">            <form action="deal.jsp" method="post" id="registe">                  输入验证码：                <input type="text" name="verCode" id ="verCode" />                <img  src="checkcode"  id="Img" align="absmiddle" onclick="reloadImage()" />                <input type ="submit" name="btn" value="check" />                <p>${result}</p>${str}                 <%                    session.invalidate();                %>              </div>    </form></body></html>

验证结果页面：

<%@page contentType="text/html" pageEncoding="UTF-8"%><!DOCTYPE html><html>    <head>        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">        <title>JSP Page</title>    </head>    <body>        <%              String result = "";            if(request.getParameter("verCode").toUpperCase().equals(session.getAttribute("str"))) {                  result="验证码正确！";                 session.setAttribute("result", result);                response.sendRedirect("index.jsp");                             }            else{                result = "验证码不正确，请重新输入！";                session.setAttribute("result", result);              response.sendRedirect("index.jsp");           }                          %>                    </body></html>

0 0