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[Java学习] Java生成中文汉字随机验证码

发表于 2016-11-28 08:00:06
实现主要包含两个类,一个是生成验证码,一个是判断验证码输入是否正确 实现原理比较简单,将汉字和干扰线生成图片并将汉字保存到session,前台获取每次生成的验证码图片进行展示,验证的时候就获取文本框输入的值传到后台与session值进行比较,功能就怎么简单。 一、生成汉字验证码的类
  1. package com.veryCode;
  2. import java.awt.Color;
  3. import java.awt.Font;
  4. import java.awt.Graphics;
  5. import java.awt.Graphics2D;
  6. import java.awt.image.BufferedImage;
  7. import java.io.IOException;
  8. import java.util.Random;
  9. import javax.imageio.ImageIO;
  10. import javax.servlet.ServletException;
  11. import javax.servlet.http.HttpServlet;
  12. import javax.servlet.http.HttpServletRequest;
  13. import javax.servlet.http.HttpServletResponse;
  14. /**
  15. * 生成随机汉字验证码
  16. * @author feizi
  17. * @time 2015-1-30下午3:16:55
  18. */
  19. public class DrawVeryCode extends HttpServlet {
  20. private static final long serialVersionUID = -3002087466925846353L;
  21. public static final int WIDTH = 120;
  22. public static final int HEIGHT = 30;
  23. public void doGet(HttpServletRequest request,HttpServletResponse response)
  24. throws ServletException,IOException{
  25. this.doPost(request, response);
  26. }
  27. public void doPost(HttpServletRequest request,HttpServletResponse response)
  28. throws ServletException,IOException{
  29. request.setCharacterEncoding("utf-8");
  30. response.setContentType("text/html;charset=utf-8");
  31. //创建图片缓存
  32. BufferedImage bi = new BufferedImage(WIDTH, HEIGHT,
  33. BufferedImage.TYPE_INT_RGB);
  34. //获得画布
  35. Graphics g = bi.getGraphics();
  36. //设置背景颜色
  37. setBackGroundColor(g);
  38. //设置边框
  39. setBorder(g);
  40. //绘制干扰线
  41. drawRandomLine(g);
  42. //产生随机汉字验证码
  43. String randomChar = drawRandomChar((Graphics2D)g);//强制转换
  44. //将产生的随机汉字验证码存进session中进行保存
  45. request.getSession().setAttribute("veryCode", randomChar);
  46. //设置响应信息的类型为图片类型
  47. response.setContentType("image/jpeg");
  48. //控制Http缓存,设置响应头信息,防止浏览器缓存
  49. response.setDateHeader("expries", -1);
  50. response.setHeader("Cache-Control", "no-Cache");
  51. response.setHeader("Pargma", "no-Cache");
  52. //将验证码图片写到浏览器中
  53. ImageIO.write(bi, "jpg", response.getOutputStream());
  54. }
  55. /**
  56. * 设置背景颜色
  57. * @param g
  58. */
  59. private void setBackGroundColor(Graphics g){
  60. //设置背景颜色
  61. g.setColor(Color.WHITE);
  62. //填充区域
  63. g.fillRect(0, 0, WIDTH, HEIGHT);
  64. }
  65. /**
  66. * 设置边框
  67. * @param g
  68. */
  69. private void setBorder(Graphics g){
  70. //设置边框颜色
  71. g.setColor(Color.BLUE);
  72. //设置边框区域
  73. g.drawRect(1, 1, WIDTH - 2, HEIGHT - 2);
  74. }
  75. /**
  76. * 画干扰线
  77. * @param g
  78. */
  79. private void drawRandomLine(Graphics g){
  80. //设置干扰线的颜色
  81. g.setColor(Color.GREEN);
  82. //设置线条条数并开始画线
  83. for (int i = 0; i < 40; i++) {
  84. int x1 = new Random().nextInt(WIDTH);
  85. int y1 = new Random().nextInt(HEIGHT);
  86. int x2 = new Random().nextInt(WIDTH);
  87. int y2 = new Random().nextInt(HEIGHT);
  88. //开始画线
  89. g.drawLine(x1, y1, x2, y2);
  90. }
  91. }
  92. /**
  93. * 画随机汉字
  94. * @param g
  95. */
  96. private String drawRandomChar(Graphics2D g){
  97. StringBuffer sb = new StringBuffer();
  98. //设置颜色
  99. g.setColor(Color.RED);
  100. //设置字体
  101. g.setFont(new Font("宋体", Font.BOLD, 20));
  102. //准备常用汉字集
  103. String base = "\u7684\u4e00\u4e86\u662f\u6211\u4e0d\u5728\u4eba\u4eec\u6709\u6765\u4ed6\u8fd9" +
  104. "\u4e0a\u7740\u4e2a\u5730\u5230\u5927\u91cc\u8bf4\u5c31\u53bb\u5b50\u5f97\u4e5f\u548c" +
  105. "\u90a3\u8981\u4e0b\u770b\u5929\u65f6\u8fc7\u51fa\u5c0f\u4e48\u8d77\u4f60\u90fd\u628a" +
  106. "\u597d\u8fd8\u591a\u6ca1\u4e3a\u53c8\u53ef\u5bb6\u5b66\u53ea\u4ee5\u4e3b\u4f1a\u6837" +
  107. "\u5e74\u60f3\u751f\u540c\u8001\u4e2d\u5341\u4ece\u81ea\u9762\u524d\u5934\u9053\u5b83" +
  108. "\u540e\u7136\u8d70\u5f88\u50cf\u89c1\u4e24\u7528\u5979\u56fd\u52a8\u8fdb\u6210\u56de" +
  109. "\u4ec0\u8fb9\u4f5c\u5bf9\u5f00\u800c\u5df1\u4e9b\u73b0\u5c71\u6c11\u5019\u7ecf\u53d1" +
  110. "\u5de5\u5411\u4e8b\u547d\u7ed9\u957f\u6c34\u51e0\u4e49\u4e09\u58f0\u4e8e\u9ad8\u624b" +
  111. "\u77e5\u7406\u773c\u5fd7\u70b9\u5fc3\u6218\u4e8c\u95ee\u4f46\u8eab\u65b9\u5b9e\u5403" +
  112. "\u505a\u53eb\u5f53\u4f4f\u542c\u9769\u6253\u5462\u771f\u5168\u624d\u56db\u5df2\u6240" +
  113. "\u654c\u4e4b\u6700\u5149\u4ea7\u60c5\u8def\u5206\u603b\u6761\u767d\u8bdd\u4e1c\u5e2d" +
  114. "\u6b21\u4eb2\u5982\u88ab\u82b1\u53e3\u653e\u513f\u5e38\u6c14\u4e94\u7b2c\u4f7f\u5199" +
  115. "\u519b\u5427\u6587\u8fd0\u518d\u679c\u600e\u5b9a\u8bb8\u5feb\u660e\u884c\u56e0\u522b" +
  116. "\u98de\u5916\u6811\u7269\u6d3b\u90e8\u95e8\u65e0\u5f80\u8239\u671b\u65b0\u5e26\u961f" +
  117. "\u5148\u529b\u5b8c\u5374\u7ad9\u4ee3\u5458\u673a\u66f4\u4e5d\u60a8\u6bcf\u98ce\u7ea7" +
  118. "\u8ddf\u7b11\u554a\u5b69\u4e07\u5c11\u76f4\u610f\u591c\u6bd4\u9636\u8fde\u8f66\u91cd" +
  119. "\u4fbf\u6597\u9a6c\u54ea\u5316\u592a\u6307\u53d8\u793e\u4f3c\u58eb\u8005\u5e72\u77f3" +
  120. "\u6ee1\u65e5\u51b3\u767e\u539f\u62ff\u7fa4\u7a76\u5404\u516d\u672c\u601d\u89e3\u7acb" +
  121. "\u6cb3\u6751\u516b\u96be\u65e9\u8bba\u5417\u6839\u5171\u8ba9\u76f8\u7814\u4eca\u5176" +
  122. "\u4e66\u5750\u63a5\u5e94\u5173\u4fe1\u89c9\u6b65\u53cd\u5904\u8bb0\u5c06\u5343\u627e" +
  123. "\u4e89\u9886\u6216\u5e08\u7ed3\u5757\u8dd1\u8c01\u8349\u8d8a\u5b57\u52a0\u811a\u7d27" +
  124. "\u7231\u7b49\u4e60\u9635\u6015\u6708\u9752\u534a\u706b\u6cd5\u9898\u5efa\u8d76\u4f4d" +
  125. "\u5531\u6d77\u4e03\u5973\u4efb\u4ef6\u611f\u51c6\u5f20\u56e2\u5c4b\u79bb\u8272\u8138" +
  126. "\u7247\u79d1\u5012\u775b\u5229\u4e16\u521a\u4e14\u7531\u9001\u5207\u661f\u5bfc\u665a" +
  127. "\u8868\u591f\u6574\u8ba4\u54cd\u96ea\u6d41\u672a\u573a\u8be5\u5e76\u5e95\u6df1\u523b" +
  128. "\u5e73\u4f1f\u5fd9\u63d0\u786e\u8fd1\u4eae\u8f7b\u8bb2\u519c\u53e4\u9ed1\u544a\u754c" +
  129. "\u62c9\u540d\u5440\u571f\u6e05\u9633\u7167\u529e\u53f2\u6539\u5386\u8f6c\u753b\u9020" +
  130. "\u5634\u6b64\u6cbb\u5317\u5fc5\u670d\u96e8\u7a7f\u5185\u8bc6\u9a8c\u4f20\u4e1a\u83dc" +
  131. "\u722c\u7761\u5174\u5f62\u91cf\u54b1\u89c2\u82e6\u4f53\u4f17\u901a\u51b2\u5408\u7834" +
  132. "\u53cb\u5ea6\u672f\u996d\u516c\u65c1\u623f\u6781\u5357\u67aa\u8bfb\u6c99\u5c81\u7ebf" +
  133. "\u91ce\u575a\u7a7a\u6536\u7b97\u81f3\u653f\u57ce\u52b3\u843d\u94b1\u7279\u56f4\u5f1f" +
  134. "\u80dc\u6559\u70ed\u5c55\u5305\u6b4c\u7c7b\u6e10\u5f3a\u6570\u4e61\u547c\u6027\u97f3" +
  135. "\u7b54\u54e5\u9645\u65e7\u795e\u5ea7\u7ae0\u5e2e\u5566\u53d7\u7cfb\u4ee4\u8df3\u975e" +
  136. "\u4f55\u725b\u53d6\u5165\u5cb8\u6562\u6389\u5ffd\u79cd\u88c5\u9876\u6025\u6797\u505c" +
  137. "\u606f\u53e5\u533a\u8863\u822c\u62a5\u53f6\u538b\u6162\u53d4\u80cc\u7ec6";
  138. int x = 5;
  139. //控制字数,最多4个字
  140. for (int i = 0; i < 4; i++) {
  141. //设置字体旋转角度
  142. int degree = new Random().nextInt() % 30;
  143. //截取汉字
  144. String ch = base.charAt(new Random().nextInt(base.length())) + "";
  145. //追加到sb中
  146. sb.append(ch);
  147. //顺时针旋转
  148. g.rotate(degree * Math.PI / 180, x, 20);
  149. //开始画汉字
  150. g.drawString(ch, x, 20);
  151. //逆时针旋转
  152. g.rotate(-(degree * Math.PI / 180), x, 20);
  153. x += 30;
  154. }
  155. return sb.toString();
  156. }
  157. public static void main(String[] args) {
  158. String s = "1234565236985";
  159. System.out.println(s.charAt(5) + "");
  160. System.out.println(new Random().nextInt());
  161. }
  162. }
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二、验证前台页面上输入的验证码信息
  1. package com.veryCode;
  2. import java.io.IOException;
  3. import java.io.PrintWriter;
  4. import javax.servlet.ServletException;
  5. import javax.servlet.http.HttpServlet;
  6. import javax.servlet.http.HttpServletRequest;
  7. import javax.servlet.http.HttpServletResponse;
  8. /**
  9. * 验证页面上输入的验证码信息
  10. * @author feizi
  11. * @time 2015-2-2上午8:14:22
  12. */
  13. public class ResultServlet extends HttpServlet {
  14. private static final long serialVersionUID = -4023881398470853660L;
  15. public void doGet(HttpServletRequest request,HttpServletResponse response)
  16. throws ServletException,IOException{
  17. doPost(request, response);
  18. }
  19. public void doPost(HttpServletRequest request,HttpServletResponse response)
  20. throws ServletException,IOException{
  21. request.setCharacterEncoding("utf-8");
  22. response.setContentType("text/html;charset=utf-8");
  23. //产生的正确的验证码值
  24. String validateC = (String) request.getSession().getAttribute("veryCode");
  25. //浏览器中用户输入的验证码值
  26. String veryCode = request.getParameter("code");
  27. PrintWriter out = response.getWriter();
  28. if(null == veryCode || "".equals(veryCode)){
  29. out.println("请输入验证码...");
  30. }else{
  31. if(validateC.equals(veryCode)){
  32. out.print(1);
  33. }else{
  34. out.println("对不起,验证码输入错误...");
  35. }
  36. }
  37. out.flush();
  38. out.close();
  39. }
  40. }
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三,编写前台页面,展示验证码信息
  1. <%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
  2. <%
  3. String path = request.getContextPath();
  4. String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
  5. %>
  6. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
  7. <html>
  8. <head>
  9. <base href="<%=basePath%>">
  10. <title>随机汉字验证码</title>
  11. <meta http-equiv="pragma" content="no-cache">
  12. <meta http-equiv="cache-control" content="no-cache">
  13. <meta http-equiv="expires" content="0">
  14. <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
  15. <meta http-equiv="description" content="This is my page">
  16. <script type="text/javascript" src="js/jquery-1.9.1.min.js"></script>
  17. <script type="text/javascript" src="js/veryCode.js"></script>
  18. </head>
  19. <body>
  20. <div>
  21. <label>验证码:</label>
  22. <input id="veryCode" name="veryCode" type="text" class="yzm" value=""/>
  23. <input id="submit" value="提交" type="button" onclick="isRightCode();"/>
  24. </div>
  25. <br>
  26. <div>
  27. <img id="imgObj" alt="" src="DrawVeryCode">&nbsp;&nbsp;
  28. <a href="javascript:void(0);" onclick="changeImg()">换一张</a>
  29. </div>
  30. <br>
  31. <div>
  32. <span style="line-height: 38px; color: #FF0000; text-align: center;" colspan="2" id="info"></span>
  33. </div>
  34. </body>
  35. </html>
复制代码

四,js文件
  1. /**
  2. * 点击切换一张验证码
  3. */
  4. function changeImg(){
  5. var imgSrc = $('#imgObj');
  6. var src = imgSrc.attr('src');
  7. // alert("src:"+src);
  8. imgSrc.attr('src',chgUrl(src));
  9. $('#info').html('');
  10. }
  11. //时间戳处理
  12. /**
  13. * 为了使每次生成图片不一致,即不让浏览器读缓存,所以需要加上时间戳
  14. */
  15. function chgUrl(url){
  16. var timestamp = (new Date()).valueOf();
  17. url = url.substring(0,12);
  18. //alert("timestamp:"+timestamp+">>>>url:"+url);
  19. if(url.indexOf("&") >= 0){
  20. url = url + "×tamp=" + timestamp;
  21. }else{
  22. url = url + "?timestamp=" + timestamp;
  23. }
  24. return url;
  25. }
  26. /**
  27. * 验证输入的验证码
  28. */
  29. function isRightCode(){
  30. var code = $('#veryCode').val();
  31. code = "code=" + code;
  32. $.ajax({
  33. type:"POST",
  34. url:"ResultServlet",
  35. dataType:"text",
  36. data:code,
  37. success:function(data){
  38. //验证以后处理提交信息或错误信息
  39. if(data == 1){
  40. $("#info").html("恭喜您,成功了!");
  41. return;
  42. }else{
  43. $("#info").html(data);
  44. return;
  45. }
  46. },
  47. error:function(){
  48. alert('链接出现错误!');
  49. }
  50. });
  51. }
复制代码

五,运行效果

这里写图片描述

这里写图片描述

ok,到这里基本上全部已经好了,如果想实现更加复杂一点的可以再自行进行研究扩展。。。

来自:http://blog.csdn.net/hu1991die/article/details/43792027



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