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Java版仿QQ验证码风格图片验证码

2016-7-29 15:41| 发布者: zhangjf| 查看: 606| 评论: 0

摘要: 本文为大家分享了Java版仿QQ验证码风格图片验证码，具体内容如下 功能包括：自定义图片尺寸和字符长度，随机背景颜色和字符颜色，随机字符偏移角度，字符平滑边缘，干扰线，噪点，背景扭曲。 本来想做字符扭曲的， ...

本文为大家分享了Java版仿QQ验证码风格图片验证码，具体内容如下

功能包括：自定义图片尺寸和字符长度，随机背景颜色和字符颜色，随机字符偏移角度，字符平滑边缘，干扰线，噪点，背景扭曲。
本来想做字符扭曲的，不知道怎的先生成文字再扭曲就报错了，先就这样吧，希望有高手能帮助修正一下。
需要说明的是之所以有几分像QQ的验证码感觉是因为这个Algerian字体，如果系统没有的话需要自行安装，百度搜字体名能下载到，丢系统Fonts文件夹就行。

效果图：

  2. package hh.com.util;
  4. import java.io.IOException;
  6. import javax.servlet.ServletException;
  7. import javax.servlet.http.HttpServletRequest;
  8. import javax.servlet.http.HttpServletResponse;
  9. import javax.servlet.http.HttpSession;
  11. public class AuthImage extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
  12. static final long serialVersionUID = 1L;
  14. public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  15. response.setHeader("Pragma", "No-cache");
  16. response.setHeader("Cache-Control", "no-cache");
  17. response.setDateHeader("Expires", 0);
  18. response.setContentType("image/jpeg");
  20. //生成随机字串
  21. String verifyCode = VerifyCodeUtils.generateVerifyCode(4);
  22. //存入会话session
  23. HttpSession session = request.getSession(true);
  24. session.setAttribute("rand", verifyCode.toLowerCase());
  25. //生成图片
  26. int w = 200, h = 80;
  27. VerifyCodeUtils.outputImage(w, h, response.getOutputStream(), verifyCode);
  29. }
  30. }
复制代码

VerifyCodeUtils类

  2. package hh.com.util;
  4. import java.awt.Color;
  5. import java.awt.Font;
  6. import java.awt.Graphics;
  7. import java.awt.Graphics2D;
  8. import java.awt.LinearGradientPaint;
  9. import java.awt.Paint;
  10. import java.awt.RenderingHints;
  11. import java.awt.geom.AffineTransform;
  12. import java.awt.image.BufferedImage;
  13. import java.io.File;
  14. import java.io.FileOutputStream;
  15. import java.io.IOException;
  16. import java.io.OutputStream;
  17. import java.util.Arrays;
  18. import java.util.Random;
  20. import javax.imageio.ImageIO;
  22. public class VerifyCodeUtils{
  24. //使用到Algerian字体，系统里没有的话需要安装字体，字体只显示大写，去掉了1,0,i,o几个容易混淆的字符
  25. public static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ";
  26. private static Random random = new Random();
  29. /**
  30. * 使用系统默认字符源生成验证码
  31. * @param verifySize 验证码长度
  32. * @return
  33. */
  34. public static String generateVerifyCode(int verifySize){
  35. return generateVerifyCode(verifySize, VERIFY_CODES);
  36. }
  37. /**
  38. * 使用指定源生成验证码
  39. * @param verifySize 验证码长度
  40. * @param sources 验证码字符源
  41. * @return
  42. */
  43. public static String generateVerifyCode(int verifySize, String sources){
  44. if(sources == null || sources.length() == 0){
  45. sources = VERIFY_CODES;
  46. }
  47. int codesLen = sources.length();
  48. Random rand = new Random(System.currentTimeMillis());
  49. StringBuilder verifyCode = new StringBuilder(verifySize);
  50. for(int i = 0; i < verifySize; i++){
  51. verifyCode.append(sources.charAt(rand.nextInt(codesLen-1)));
  52. }
  53. return verifyCode.toString();
  54. }
  56. /**
  57. * 生成随机验证码文件,并返回验证码值
  58. * @param w
  59. * @param h
  60. * @param outputFile
  61. * @param verifySize
  62. * @return
  63. * @throws IOException
  64. */
  65. public static String outputVerifyImage(int w, int h, File outputFile, int verifySize) throws IOException{
  66. String verifyCode = generateVerifyCode(verifySize);
  67. outputImage(w, h, outputFile, verifyCode);
  68. return verifyCode;
  69. }
  71. /**
  72. * 输出随机验证码图片流,并返回验证码值
  73. * @param w
  74. * @param h
  75. * @param os
  76. * @param verifySize
  77. * @return
  78. * @throws IOException
  79. */
  80. public static String outputVerifyImage(int w, int h, OutputStream os, int verifySize) throws IOException{
  81. String verifyCode = generateVerifyCode(verifySize);
  82. outputImage(w, h, os, verifyCode);
  83. return verifyCode;
  84. }
  86. /**
  87. * 生成指定验证码图像文件
  88. * @param w
  89. * @param h
  90. * @param outputFile
  91. * @param code
  92. * @throws IOException
  93. */
  94. public static void outputImage(int w, int h, File outputFile, String code) throws IOException{
  95. if(outputFile == null){
  96. return;
  97. }
  98. File dir = outputFile.getParentFile();
  99. if(!dir.exists()){
  100. dir.mkdirs();
  101. }
  102. try{
  103. outputFile.createNewFile();
  104. FileOutputStream fos = new FileOutputStream(outputFile);
  105. outputImage(w, h, fos, code);
  106. fos.close();
  107. } catch(IOException e){
  108. throw e;
  109. }
  110. }
  112. /**
  113. * 输出指定验证码图片流
  114. * @param w
  115. * @param h
  116. * @param os
  117. * @param code
  118. * @throws IOException
  119. */
  120. public static void outputImage(int w, int h, OutputStream os, String code) throws IOException{
  121. int verifySize = code.length();
  122. BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
  123. Random rand = new Random();
  124. Graphics2D g2 = image.createGraphics();
  125. g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
  126. Color[] colors = new Color[5];
  127. Color[] colorSpaces = new Color[] { Color.WHITE, Color.CYAN,
  128. Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE,
  129. Color.PINK, Color.YELLOW };
  130. float[] fractions = new float[colors.length];
  131. for(int i = 0; i < colors.length; i++){
  132. colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];
  133. fractions[i] = rand.nextFloat();
  134. }
  135. Arrays.sort(fractions);
  137. g2.setColor(Color.GRAY);// 设置边框色
  138. g2.fillRect(0, 0, w, h);
  140. Color c = getRandColor(200, 250);
  141. g2.setColor(c);// 设置背景色
  142. g2.fillRect(0, 2, w, h-4);
  144. //绘制干扰线
  145. Random random = new Random();
  146. g2.setColor(getRandColor(160, 200));// 设置线条的颜色
  147. for (int i = 0; i < 20; i++) {
  148. int x = random.nextInt(w - 1);
  149. int y = random.nextInt(h - 1);
  150. int xl = random.nextInt(6) + 1;
  151. int yl = random.nextInt(12) + 1;
  152. g2.drawLine(x, y, x + xl + 40, y + yl + 20);
  153. }
  155. // 添加噪点
  156. float yawpRate = 0.05f;// 噪声率
  157. int area = (int) (yawpRate * w * h);
  158. for (int i = 0; i < area; i++) {
  159. int x = random.nextInt(w);
  160. int y = random.nextInt(h);
  161. int rgb = getRandomIntColor();
  162. image.setRGB(x, y, rgb);
  163. }
  165. shear(g2, w, h, c);// 使图片扭曲
  167. g2.setColor(getRandColor(100, 160));
  168. int fontSize = h-4;
  169. Font font = new Font("Algerian", Font.ITALIC, fontSize);
  170. g2.setFont(font);
  171. char[] chars = code.toCharArray();
  172. for(int i = 0; i < verifySize; i++){
  173. AffineTransform affine = new AffineTransform();
  174. affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (w / verifySize) * i + fontSize/2, h/2);
  175. g2.setTransform(affine);
  176. g2.drawChars(chars, i, 1, ((w-10) / verifySize) * i + 5, h/2 + fontSize/2 - 10);
  177. }
  179. g2.dispose();
  180. ImageIO.write(image, "jpg", os);
  181. }
  183. private static Color getRandColor(int fc, int bc) {
  184. if (fc > 255)
  185. fc = 255;
  186. if (bc > 255)
  187. bc = 255;
  188. int r = fc + random.nextInt(bc - fc);
  189. int g = fc + random.nextInt(bc - fc);
  190. int b = fc + random.nextInt(bc - fc);
  191. return new Color(r, g, b);
  192. }
  194. private static int getRandomIntColor() {
  195. int[] rgb = getRandomRgb();
  196. int color = 0;
  197. for (int c : rgb) {
  198. color = color << 8;
  199. color = color | c;
  200. }
  201. return color;
  202. }
  204. private static int[] getRandomRgb() {
  205. int[] rgb = new int[3];
  206. for (int i = 0; i < 3; i++) {
  207. rgb[i] = random.nextInt(255);
  208. }
  209. return rgb;
  210. }
  212. private static void shear(Graphics g, int w1, int h1, Color color) {
  213. shearX(g, w1, h1, color);
  214. shearY(g, w1, h1, color);
  215. }
  217. private static void shearX(Graphics g, int w1, int h1, Color color) {
  219. int period = random.nextInt(2);
  221. boolean borderGap = true;
  222. int frames = 1;
  223. int phase = random.nextInt(2);
  225. for (int i = 0; i < h1; i++) {
  226. double d = (double) (period >> 1)
  227. * Math.sin((double) i / (double) period
  228. + (6.2831853071795862D * (double) phase)
  229. / (double) frames);
  230. g.copyArea(0, i, w1, 1, (int) d, 0);
  231. if (borderGap) {
  232. g.setColor(color);
  233. g.drawLine((int) d, i, 0, i);
  234. g.drawLine((int) d + w1, i, w1, i);
  235. }
  236. }
  238. }
  240. private static void shearY(Graphics g, int w1, int h1, Color color) {
  242. int period = random.nextInt(40) + 10; // 50;
  244. boolean borderGap = true;
  245. int frames = 20;
  246. int phase = 7;
  247. for (int i = 0; i < w1; i++) {
  248. double d = (double) (period >> 1)
  249. * Math.sin((double) i / (double) period
  250. + (6.2831853071795862D * (double) phase)
  251. / (double) frames);
  252. g.copyArea(i, 0, 1, h1, 0, (int) d);
  253. if (borderGap) {
  254. g.setColor(color);
  255. g.drawLine(i, (int) d, i, 0);
  256. g.drawLine(i, (int) d + h1, i, h1);
  257. }
  259. }
  261. }
  262. public static void main(String[] args) throws IOException{
  263. File dir = new File("F:/verifies");
  264. int w = 200, h = 80;
  265. for(int i = 0; i < 50; i++){
  266. String verifyCode = generateVerifyCode(4);
  267. File file = new File(dir, verifyCode + ".jpg");
  268. outputImage(w, h, file, verifyCode);
  269. }
  270. }
  271. }
复制代码

web.xml配置:

  2. <servlet>
  3. <servlet-name>AuthImage</servlet-name>
  4. <servlet-class>hh.com.util.AuthImage</servlet-class>
  5. </servlet>
  6. <servlet-mapping>
  7. <servlet-name>AuthImage</servlet-name>
  8. <url-pattern>/authImage</url-pattern>
  9. </servlet-mapping>
复制代码

以上就是本文的全部内容，希望能够对大家学习java图片验证码有所启发。

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