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Java生成中文汉字随机验证码

2016-12-16 13:17| 发布者: zhangjf| 查看: 424| 评论: 0

摘要: 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 ...
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;
  3. import java.awt.Color;
  4. import java.awt.Font;
  5. import java.awt.Graphics;
  6. import java.awt.Graphics2D;
  7. import java.awt.image.BufferedImage;
  8. import java.io.IOException;
  9. import java.util.Random;
  11. import javax.imageio.ImageIO;
  12. import javax.servlet.ServletException;
  13. import javax.servlet.http.HttpServlet;
  14. import javax.servlet.http.HttpServletRequest;
  15. import javax.servlet.http.HttpServletResponse;
  16. /**
  17. * 生成随机汉字验证码
  18. * @author feizi
  19. * @time 2015-1-30下午3:16:55
  20. */
  21. public class DrawVeryCode extends HttpServlet {
  23. private static final long serialVersionUID = -3002087466925846353L;
  25. public static final int WIDTH = 120;
  26. public static final int HEIGHT = 30;
  28. public void doGet(HttpServletRequest request,HttpServletResponse response)
  29. throws ServletException,IOException{
  30. this.doPost(request, response);
  31. }
  33. public void doPost(HttpServletRequest request,HttpServletResponse response)
  34. throws ServletException,IOException{
  35. request.setCharacterEncoding("utf-8");
  36. response.setContentType("text/html;charset=utf-8");
  38. //创建图片缓存
  39. BufferedImage bi = new BufferedImage(WIDTH, HEIGHT,
  40. BufferedImage.TYPE_INT_RGB);
  42. //获得画布
  43. Graphics g = bi.getGraphics();
  45. //设置背景颜色
  46. setBackGroundColor(g);
  48. //设置边框
  49. setBorder(g);
  51. //绘制干扰线
  52. drawRandomLine(g);
  54. //产生随机汉字验证码
  55. String randomChar = drawRandomChar((Graphics2D)g);//强制转换
  57. //将产生的随机汉字验证码存进session中进行保存
  58. request.getSession().setAttribute("veryCode", randomChar);
  60. //设置响应信息的类型为图片类型
  61. response.setContentType("image/jpeg");
  63. //控制Http缓存，设置响应头信息，防止浏览器缓存
  64. response.setDateHeader("expries", -1);
  65. response.setHeader("Cache-Control", "no-Cache");
  66. response.setHeader("Pargma", "no-Cache");
  68. //将验证码图片写到浏览器中
  69. ImageIO.write(bi, "jpg", response.getOutputStream());
  70. }
  72. /**
  73. * 设置背景颜色
  74. * @param g
  75. */
  76. private void setBackGroundColor(Graphics g){
  77. //设置背景颜色
  78. g.setColor(Color.WHITE);
  79. //填充区域
  80. g.fillRect(0, 0, WIDTH, HEIGHT);
  81. }
  83. /**
  84. * 设置边框
  85. * @param g
  86. */
  87. private void setBorder(Graphics g){
  88. //设置边框颜色
  89. g.setColor(Color.BLUE);
  90. //设置边框区域
  91. g.drawRect(1, 1, WIDTH - 2, HEIGHT - 2);
  92. }
  94. /**
  95. * 画干扰线
  96. * @param g
  97. */
  98. private void drawRandomLine(Graphics g){
  99. //设置干扰线的颜色
  100. g.setColor(Color.GREEN);
  101. //设置线条条数并开始画线
  102. for (int i = 0; i < 40; i++) {
  103. int x1 = new Random().nextInt(WIDTH);
  104. int y1 = new Random().nextInt(HEIGHT);
  105. int x2 = new Random().nextInt(WIDTH);
  106. int y2 = new Random().nextInt(HEIGHT);
  108. //开始画线
  109. g.drawLine(x1, y1, x2, y2);
  110. }
  111. }
  113. /**
  114. * 画随机汉字
  115. * @param g
  116. */
  117. private String drawRandomChar(Graphics2D g){
  118. StringBuffer sb = new StringBuffer();
  120. //设置颜色
  121. g.setColor(Color.RED);
  123. //设置字体
  124. g.setFont(new Font("宋体", Font.BOLD, 20));
  126. //准备常用汉字集
  127. String base = "u7684u4e00u4e86u662fu6211u4e0du5728u4ebau4eecu6709u6765u4ed6u8fd9" +
  128. "u4e0au7740u4e2au5730u5230u5927u91ccu8bf4u5c31u53bbu5b50u5f97u4e5fu548c" +
  129. "u90a3u8981u4e0bu770bu5929u65f6u8fc7u51fau5c0fu4e48u8d77u4f60u90fdu628a" +
  130. "u597du8fd8u591au6ca1u4e3au53c8u53efu5bb6u5b66u53eau4ee5u4e3bu4f1au6837" +
  131. "u5e74u60f3u751fu540cu8001u4e2du5341u4eceu81eau9762u524du5934u9053u5b83" +
  132. "u540eu7136u8d70u5f88u50cfu89c1u4e24u7528u5979u56fdu52a8u8fdbu6210u56de" +
  133. "u4ec0u8fb9u4f5cu5bf9u5f00u800cu5df1u4e9bu73b0u5c71u6c11u5019u7ecfu53d1" +
  134. "u5de5u5411u4e8bu547du7ed9u957fu6c34u51e0u4e49u4e09u58f0u4e8eu9ad8u624b" +
  135. "u77e5u7406u773cu5fd7u70b9u5fc3u6218u4e8cu95eeu4f46u8eabu65b9u5b9eu5403" +
  136. "u505au53ebu5f53u4f4fu542cu9769u6253u5462u771fu5168u624du56dbu5df2u6240" +
  137. "u654cu4e4bu6700u5149u4ea7u60c5u8defu5206u603bu6761u767du8bddu4e1cu5e2d" +
  138. "u6b21u4eb2u5982u88abu82b1u53e3u653eu513fu5e38u6c14u4e94u7b2cu4f7fu5199" +
  139. "u519bu5427u6587u8fd0u518du679cu600eu5b9au8bb8u5febu660eu884cu56e0u522b" +
  140. "u98deu5916u6811u7269u6d3bu90e8u95e8u65e0u5f80u8239u671bu65b0u5e26u961f" +
  141. "u5148u529bu5b8cu5374u7ad9u4ee3u5458u673au66f4u4e5du60a8u6bcfu98ceu7ea7" +
  142. "u8ddfu7b11u554au5b69u4e07u5c11u76f4u610fu591cu6bd4u9636u8fdeu8f66u91cd" +
  143. "u4fbfu6597u9a6cu54eau5316u592au6307u53d8u793eu4f3cu58ebu8005u5e72u77f3" +
  144. "u6ee1u65e5u51b3u767eu539fu62ffu7fa4u7a76u5404u516du672cu601du89e3u7acb" +
  145. "u6cb3u6751u516bu96beu65e9u8bbau5417u6839u5171u8ba9u76f8u7814u4ecau5176" +
  146. "u4e66u5750u63a5u5e94u5173u4fe1u89c9u6b65u53cdu5904u8bb0u5c06u5343u627e" +
  147. "u4e89u9886u6216u5e08u7ed3u5757u8dd1u8c01u8349u8d8au5b57u52a0u811au7d27" +
  148. "u7231u7b49u4e60u9635u6015u6708u9752u534au706bu6cd5u9898u5efau8d76u4f4d" +
  149. "u5531u6d77u4e03u5973u4efbu4ef6u611fu51c6u5f20u56e2u5c4bu79bbu8272u8138" +
  150. "u7247u79d1u5012u775bu5229u4e16u521au4e14u7531u9001u5207u661fu5bfcu665a" +
  151. "u8868u591fu6574u8ba4u54cdu96eau6d41u672au573au8be5u5e76u5e95u6df1u523b" +
  152. "u5e73u4f1fu5fd9u63d0u786eu8fd1u4eaeu8f7bu8bb2u519cu53e4u9ed1u544au754c" +
  153. "u62c9u540du5440u571fu6e05u9633u7167u529eu53f2u6539u5386u8f6cu753bu9020" +
  154. "u5634u6b64u6cbbu5317u5fc5u670du96e8u7a7fu5185u8bc6u9a8cu4f20u4e1au83dc" +
  155. "u722cu7761u5174u5f62u91cfu54b1u89c2u82e6u4f53u4f17u901au51b2u5408u7834" +
  156. "u53cbu5ea6u672fu996du516cu65c1u623fu6781u5357u67aau8bfbu6c99u5c81u7ebf" +
  157. "u91ceu575au7a7au6536u7b97u81f3u653fu57ceu52b3u843du94b1u7279u56f4u5f1f" +
  158. "u80dcu6559u70edu5c55u5305u6b4cu7c7bu6e10u5f3au6570u4e61u547cu6027u97f3" +
  159. "u7b54u54e5u9645u65e7u795eu5ea7u7ae0u5e2eu5566u53d7u7cfbu4ee4u8df3u975e" +
  160. "u4f55u725bu53d6u5165u5cb8u6562u6389u5ffdu79cdu88c5u9876u6025u6797u505c" +
  161. "u606fu53e5u533au8863u822cu62a5u53f6u538bu6162u53d4u80ccu7ec6";
  163. int x = 5;
  165. //控制字数,最多4个字
  166. for (int i = 0; i < 4; i++) {
  167. //设置字体旋转角度
  168. int degree = new Random().nextInt() % 30;
  170. //截取汉字
  171. String ch = base.charAt(new Random().nextInt(base.length())) + "";
  173. //追加到sb中
  174. sb.append(ch);
  176. //顺时针旋转
  177. g.rotate(degree * Math.PI / 180, x, 20);
  179. //开始画汉字
  180. g.drawString(ch, x, 20);
  182. //逆时针旋转
  183. g.rotate(-(degree * Math.PI / 180), x, 20);
  185. x += 30;
  186. }
  187. return sb.toString();
  188. }
  190. public static void main(String[] args) {
  191. String s = "1234565236985";
  192. System.out.println(s.charAt(5) + "");
  193. System.out.println(new Random().nextInt());
  194. }
  195. }
复制代码

二、验证前台页面上输入的验证码信息
  1. package com.veryCode;
  3. import java.io.IOException;
  4. import java.io.PrintWriter;
  6. import javax.servlet.ServletException;
  7. import javax.servlet.http.HttpServlet;
  8. import javax.servlet.http.HttpServletRequest;
  9. import javax.servlet.http.HttpServletResponse;
  10. /**
  11. * 验证页面上输入的验证码信息
  12. * @author feizi
  13. * @time 2015-2-2上午8:14:22
  14. */
  15. public class ResultServlet extends HttpServlet {
  17. private static final long serialVersionUID = -4023881398470853660L;
  19. public void doGet(HttpServletRequest request,HttpServletResponse response)
  20. throws ServletException,IOException{
  22. doPost(request, response);
  23. }
  25. public void doPost(HttpServletRequest request,HttpServletResponse response)
  26. throws ServletException,IOException{
  27. request.setCharacterEncoding("utf-8");
  28. response.setContentType("text/html;charset=utf-8");
  29. //产生的正确的验证码值
  30. String validateC = (String) request.getSession().getAttribute("veryCode");
  32. //浏览器中用户输入的验证码值
  33. String veryCode = request.getParameter("code");
  35. PrintWriter out = response.getWriter();
  36. if(null == veryCode || "".equals(veryCode)){
  37. out.println("请输入验证码...");
  38. }else{
  39. if(validateC.equals(veryCode)){
  40. out.print(1);
  41. }else{
  42. out.println("对不起，验证码输入错误...");
  43. }
  44. }
  46. out.flush();
  47. out.close();
  48. }
  49. }
复制代码

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. %>
  7. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
  8. <html>
  9. <head>
  10. <base href="<%=basePath%>">
  12. <title>随机汉字验证码</title>
  14. <meta http-equiv="pragma" content="no-cache">
  15. <meta http-equiv="cache-control" content="no-cache">
  16. <meta http-equiv="expires" content="0">
  17. <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
  18. <meta http-equiv="description" content="This is my page">
  20. <script type="text/javascript" src="js/jquery-1.9.1.min.js"></script>
  21. <script type="text/javascript" src="js/veryCode.js"></script>
  22. </head>
  24. <body>
  25. <div>
  26. <label>验证码：</label>
  27. <input id="veryCode" name="veryCode" type="text" class="yzm" value=""/>
  28. <input id="submit" value="提交" type="button" onclick="isRightCode();"/>
  29. </div>
  30. <br>
  31. <div>
  32. <img id="imgObj" alt="" src="DrawVeryCode">&nbsp;&nbsp;
  33. <a href="javascript:void(0);" onclick="changeImg()">换一张</a>
  34. </div>
  35. <br>
  36. <div>
  37. <span style="line-height: 38px; color: #FF0000; text-align: center;" colspan="2" id="info"></span>
  38. </div>
  39. </body>
  40. </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');
  8. // alert("src:"+src);
  10. imgSrc.attr('src',chgUrl(src));
  11. $('#info').html('');
  12. }
  14. //时间戳处理
  15. /**
  16. * 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
  17. */
  18. function chgUrl(url){
  19. var timestamp = (new Date()).valueOf();
  20. url = url.substring(0,12);
  22. //alert("timestamp:"+timestamp+">>>>url:"+url);
  24. if(url.indexOf("&") >= 0){
  25. url = url + "×tamp=" + timestamp;
  26. }else{
  27. url = url + "?timestamp=" + timestamp;
  28. }
  29. return url;
  30. }
  32. /**
  33. * 验证输入的验证码
  34. */
  35. function isRightCode(){
  36. var code = $('#veryCode').val();
  37. code = "code=" + code;
  38. $.ajax({
  39. type:"POST",
  40. url:"ResultServlet",
  41. dataType:"text",
  42. data:code,
  43. success:function(data){
  44. //验证以后处理提交信息或错误信息
  45. if(data == 1){
  46. $("#info").html("恭喜您，成功了！");
  47. return;
  48. }else{
  49. $("#info").html(data);
  50. return;
  51. }
  52. },
  53. error:function(){
  54. alert('链接出现错误！');
  55. }
  56. });
  58. }
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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