这篇文章主要为大家详细介绍了jsp页面验证码完整实例，具有一定的参考和学习jsp的价值，对jsp感兴趣的小伙伴们可以参考一下本篇文章
项目结构如下，MyEclipse中新建一个Web Project，取名servlet
1、src下new一个servlet类
package com.servlet;import java.awt.Color;import java.awt.Font;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.IOException;import java.io.PrintWriter;import java.util.Random;import javax.servlet.ServletException;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGImageEncoder;public class IdentityServlet extends HttpServlet { public static final char[] chars={'2','3','4','5','6','7','8','9','A'};//自定义验证码池 public static Random random=new Random(); //随机数 public static String getRandomString(){ //获取6位随机数，放在图片里 StringBuffer buffer=new StringBuffer(); for(int i=0;i */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * The doGet method of the servlet.
* * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("image/jpeg"); //设置输出类型 String randomString = getRandomString(); //随机字符串 request.getSession(true).setAttribute("randomString", randomString);//放到session里 int width=100; //图片宽度 int height=30; //图片高度 Color color=getRandomColor(); //随机颜色，用于背景色 Color reverse=getReverseColor(color);//反色，用于前景色 //创建一个彩色图片 BufferedImage bi=new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g=bi.createGraphics(); //绘图对象 g.setFont(new Font(Font.SANS_SERIF,Font.BOLD,16));//设置字体 g.setColor(color);//设置颜色 g.fillRect(0, 0, width, height);//绘制背景 g.setColor(reverse); g.drawString(randomString, 18, 20);//绘制随机字符 for(int i=0,n=random.nextInt(100);i * * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } /** * Initialization of the servlet.
* * @throws ServletException if an error occurs */ public void init() throws ServletException { // Put your code here }}
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2、web.xml，会自动生成servlet和servlet-mapping的配置：
IdentityServlet com.servlet.IdentityServlet IdentityServlet /servlet/IdentityServlet index.jsp
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3、WebRoot下新建一个html，展示验证码
nbsp;html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">Insert title here function reloadImage(){ document.getElementById('btn').disabled=true; document.getElementById('identity').src='servlet/IdentityServlet?ts='+new Date().getTime();}
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启动Tomcat，输入网址：http://localhost:8080/servlet/identity.html，效果如下：
点击‘换个图片’，会生成新的验证码。
以上就是本文的全部内容，希望对大家的学习有所帮助！！
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