验证码与登录页面结合

完成验证码与登录相结合

首先让我们分析一下验证的流程(见图)
验证码
下面是登录的HTML代码(checkcode.html)

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%>
<!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">
<title>Insert title here</title>
</head>
<body>
<!-- EL表达式获取表单校验后的信息 -->
${msg }
<form action="/login" method="post"><table border="1" width="70%"><tr><td>输入姓名</td><td><input type="text" name="username" /></td></tr><tr><td>输入密码</td><td><input type="password" name="password" /></td></tr><tr><td>验证码</td><td><input type="text" name="code" /><img id="imgId" src="/checkcode"><a href="#" onclick="run()">看不清，换一张</a></td></tr><tr><td colspan="2"><input type="submit" value="登陆"/></td></tr></table></form>
</body><script type="text/javascript">// 看不清，换一张，时间戳function run(){// 获取图片var image = document.getElementById("imgId");image.src = "/checkcode?"+new Date().getTime();}</script>
</html>

然后就是后台代码(CheckcodeServlert.java)

package cn.itcast.session;import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
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;
import javax.servlet.http.HttpSession;/*** 验证码（带session校验）* @author Administrator**/
public class CheckcodeServlet extends HttpServlet {private static final long serialVersionUID = 8496591097127600779L;public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {/*** 	在内存中生成图片（纸），没有设置背景颜色，画填充的矩形，并且和纸的大小相同，矩形有颜色。* 	获取笔的对象（设置颜色，设置字体，画字符串，画矩形）* 	先准备好数据，随机生成4个字符，把字符画到纸上* 	画干扰线* 	把内存中的图片输出到客户端上*/int width = 120;int height = 30;// 在内存中生成图片BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);// 先获取画笔对象Graphics2D g = (Graphics2D) image.getGraphics();// 设置灰色g.setColor(Color.GRAY);// 画填充的矩形g.fillRect(0, 0, width, height);// 设置颜色g.setColor(Color.BLUE);// 画边框g.drawRect(0, 0, width-1, height-1);// 准备数据，随机获取4个字符// String words = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";String words = "\u7684\u4e00\u4e86\u662f\u6211\u4e0d\u5728\u4eba\u4eec\u6709\u6765\u4ed6\u8fd9\u4e0a\u7740\u4e2a\u5730\u5230\u5927\u91cc\u8bf4\u5c31\u53bb\u5b50\u5f97\u4e5f\u548c\u90a3\u8981\u4e0b\u770b\u5929\u65f6\u8fc7\u51fa\u5c0f\u4e48\u8d77\u4f60\u90fd\u628a\u597d\u8fd8\u591a\u6ca1\u4e3a\u53c8\u53ef\u5bb6\u5b66\u53ea\u4ee5\u4e3b\u4f1a\u6837\u5e74\u60f3\u751f\u540c\u8001\u4e2d\u5341\u4ece\u81ea\u9762\u524d\u5934\u9053\u5b83\u540e\u7136\u8d70\u5f88\u50cf\u89c1\u4e24\u7528\u5979\u56fd\u52a8\u8fdb\u6210\u56de\u4ec0\u8fb9\u4f5c\u5bf9\u5f00\u800c\u5df1\u4e9b\u73b0\u5c71\u6c11\u5019\u7ecf\u53d1\u5de5\u5411\u4e8b\u547d\u7ed9\u957f\u6c34\u51e0\u4e49\u4e09\u58f0\u4e8e\u9ad8\u624b\u77e5\u7406\u773c\u5fd7\u70b9\u5fc3\u6218\u4e8c\u95ee\u4f46\u8eab\u65b9\u5b9e\u5403\u505a\u53eb\u5f53\u4f4f\u542c\u9769\u6253\u5462\u771f\u5168\u624d\u56db\u5df2\u6240\u654c\u4e4b\u6700\u5149\u4ea7\u60c5\u8def\u5206\u603b\u6761\u767d\u8bdd\u4e1c\u5e2d\u6b21\u4eb2\u5982\u88ab\u82b1\u53e3\u653e\u513f\u5e38\u6c14\u4e94\u7b2c\u4f7f\u5199\u519b\u5427\u6587\u8fd0\u518d\u679c\u600e\u5b9a\u8bb8\u5feb\u660e\u884c\u56e0\u522b\u98de\u5916\u6811\u7269\u6d3b\u90e8\u95e8\u65e0\u5f80\u8239\u671b\u65b0\u5e26\u961f\u5148\u529b\u5b8c\u5374\u7ad9\u4ee3\u5458\u673a\u66f4\u4e5d\u60a8\u6bcf\u98ce\u7ea7\u8ddf\u7b11\u554a\u5b69\u4e07\u5c11\u76f4\u610f\u591c\u6bd4\u9636\u8fde\u8f66\u91cd\u4fbf\u6597\u9a6c\u54ea\u5316\u592a\u6307\u53d8\u793e\u4f3c\u58eb\u8005\u5e72\u77f3\u6ee1\u65e5\u51b3\u767e\u539f\u62ff\u7fa4\u7a76\u5404\u516d\u672c\u601d\u89e3\u7acb\u6cb3\u6751\u516b\u96be\u65e9\u8bba\u5417\u6839\u5171\u8ba9\u76f8\u7814\u4eca\u5176\u4e66\u5750\u63a5\u5e94\u5173\u4fe1\u89c9\u6b65\u53cd\u5904\u8bb0\u5c06\u5343\u627e\u4e89\u9886\u6216\u5e08\u7ed3\u5757\u8dd1\u8c01\u8349\u8d8a\u5b57\u52a0\u811a\u7d27\u7231\u7b49\u4e60\u9635\u6015\u6708\u9752\u534a\u706b\u6cd5\u9898\u5efa\u8d76\u4f4d\u5531\u6d77\u4e03\u5973\u4efb\u4ef6\u611f\u51c6\u5f20\u56e2\u5c4b\u79bb\u8272\u8138\u7247\u79d1\u5012\u775b\u5229\u4e16\u521a\u4e14\u7531\u9001\u5207\u661f\u5bfc\u665a\u8868\u591f\u6574\u8ba4\u54cd\u96ea\u6d41\u672a\u573a\u8be5\u5e76\u5e95\u6df1\u523b\u5e73\u4f1f\u5fd9\u63d0\u786e\u8fd1\u4eae\u8f7b\u8bb2\u519c\u53e4\u9ed1\u544a\u754c\u62c9\u540d\u5440\u571f\u6e05\u9633\u7167\u529e\u53f2\u6539\u5386\u8f6c\u753b\u9020\u5634\u6b64\u6cbb\u5317\u5fc5\u670d\u96e8\u7a7f\u5185\u8bc6\u9a8c\u4f20\u4e1a\u83dc\u722c\u7761\u5174\u5f62\u91cf\u54b1\u89c2\u82e6\u4f53\u4f17\u901a\u51b2\u5408\u7834\u53cb\u5ea6\u672f\u996d\u516c\u65c1\u623f\u6781\u5357\u67aa\u8bfb\u6c99\u5c81\u7ebf\u91ce\u575a\u7a7a\u6536\u7b97\u81f3\u653f\u57ce\u52b3\u843d\u94b1\u7279\u56f4\u5f1f\u80dc\u6559\u70ed\u5c55\u5305\u6b4c\u7c7b\u6e10\u5f3a\u6570\u4e61\u547c\u6027\u97f3\u7b54\u54e5\u9645\u65e7\u795e\u5ea7\u7ae0\u5e2e\u5566\u53d7\u7cfb\u4ee4\u8df3\u975e\u4f55\u725b\u53d6\u5165\u5cb8\u6562\u6389\u5ffd\u79cd\u88c5\u9876\u6025\u6797\u505c\u606f\u53e5\u533a\u8863\u822c\u62a5\u53f6\u538b\u6162\u53d4\u80cc\u7ec6";// 设置颜色g.setColor(Color.YELLOW);// 设置字体g.setFont(new Font("隶书", Font.BOLD, 20));StringBuffer sb = new StringBuffer();Random random = new Random();int x = 20;int y = 20;for(int i=0;i<4;i++){// void rotate(double theta, double x, double y)  // theta 弧度// hudu = jiaodu * Math.PI / 180;// 获取正负30之间的角度int jiaodu = random.nextInt(60)-30;double hudu = jiaodu * Math.PI / 180;g.rotate(hudu, x, y);// 获取下标int index = random.nextInt(words.length());// 返回指定下标位置的字符，随机获取下标char ch = words.charAt(index);// 把ch装起来，存入到session中sb.append(ch);// 写字符串g.drawString(""+ch, x, y);g.rotate(-hudu, x, y);x += 20;}// 存入session中//HttpSession session = request.getSession();//session.setAttribute("code", sb.toString());request.getSession().setAttribute("code", sb.toString());//String str = (String) session.getAttribute("code");//System.out.println(str);// 设置颜色g.setColor(Color.GREEN);int x1,x2,y1,y2;// 画干扰线for(int i=0;i<4;i++){x1 = random.nextInt(width);y1 = random.nextInt(height);x2 = random.nextInt(width);y2 = random.nextInt(height);g.drawLine(x1, y1, x2, y2);}// 输出到客户端ImageIO.write(image, "jpg", response.getOutputStream());}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}public static void main(String[] args) {System.out.println("\u9fa5");System.out.println("\u9fa4");System.out.println("\u9fa3");System.out.println("\u9fa2");}}

LoginServelt.java

package cn.itcast.session;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;/*** 校验验证码* @author Administrator**/
public class LoginServlet extends HttpServlet {private static final long serialVersionUID = 5683537422566655209L;public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {// 解决post请求中文乱码的问题request.setCharacterEncoding("UTF-8");//HttpSession session = request.getSession();// 获取session中验证码//String code1 = (String) session.getAttribute("code");String code1 = (String) request.getSession().getAttribute("code");System.out.println(code1);// 获取表单中的验证码String code2 = request.getParameter("code");// 是否相同if(code2 != null && code1.equals(code2)){response.getWriter().write("success");}else{// 如果不相同，返回错误的信息// 转发request.setAttribute("msg", "验证码输入错误");request.getRequestDispatcher("/session/login.jsp").forward(request, response);}}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}