Java版仿QQ验证码风格图片验证码

package hh.com.util; import java.io.IOException; import javax.servlet.ServletException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession; public class AuthImage extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet { static final long serialVersionUID = 1L;  public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  response.setHeader("Pragma", "No-cache");  response.setHeader("Cache-Control", "no-cache");  response.setDateHeader("Expires", 0);  response.setContentType("image/jpeg");     //生成随机字串  String verifyCode = VerifyCodeUtils.generateVerifyCode(4);  //存入会话session  HttpSession session = request.getSession(true);  session.setAttribute("rand", verifyCode.toLowerCase());  //生成图片  int w = 200, h = 80;  VerifyCodeUtils.outputImage(w, h, response.getOutputStream(), verifyCode);  }}

package hh.com.util; import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.LinearGradientPaint;import java.awt.Paint;import java.awt.RenderingHints;import java.awt.geom.AffineTransform;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;import java.util.Arrays;import java.util.Random; import javax.imageio.ImageIO; public class VerifyCodeUtils{  //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 public static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ"; private static Random random = new Random();   /**  * 使用系统默认字符源生成验证码  * @param verifySize 验证码长度  * @return  */ public static String generateVerifyCode(int verifySize){  return generateVerifyCode(verifySize, VERIFY_CODES); } /**  * 使用指定源生成验证码  * @param verifySize 验证码长度  * @param sources 验证码字符源  * @return  */ public static String generateVerifyCode(int verifySize, String sources){  if(sources == null || sources.length() == 0){   sources = VERIFY_CODES;  }  int codesLen = sources.length();  Random rand = new Random(System.currentTimeMillis());  StringBuilder verifyCode = new StringBuilder(verifySize);  for(int i = 0; i < verifySize; i++){   verifyCode.append(sources.charAt(rand.nextInt(codesLen-1)));  }  return verifyCode.toString(); }   /**  * 生成随机验证码文件,并返回验证码值  * @param w  * @param h  * @param outputFile  * @param verifySize  * @return  * @throws IOException  */ public static String outputVerifyImage(int w, int h, File outputFile, int verifySize) throws IOException{  String verifyCode = generateVerifyCode(verifySize);  outputImage(w, h, outputFile, verifyCode);  return verifyCode; }   /**  * 输出随机验证码图片流,并返回验证码值  * @param w  * @param h  * @param os  * @param verifySize  * @return  * @throws IOException  */ public static String outputVerifyImage(int w, int h, OutputStream os, int verifySize) throws IOException{  String verifyCode = generateVerifyCode(verifySize);  outputImage(w, h, os, verifyCode);  return verifyCode; }   /**  * 生成指定验证码图像文件  * @param w  * @param h  * @param outputFile  * @param code  * @throws IOException  */ public static void outputImage(int w, int h, File outputFile, String code) throws IOException{  if(outputFile == null){   return;  }  File dir = outputFile.getParentFile();  if(!dir.exists()){   dir.mkdirs();  }  try{   outputFile.createNewFile();   FileOutputStream fos = new FileOutputStream(outputFile);   outputImage(w, h, fos, code);   fos.close();  } catch(IOException e){   throw e;  } }   /**  * 输出指定验证码图片流  * @param w  * @param h  * @param os  * @param code  * @throws IOException  */ public static void outputImage(int w, int h, OutputStream os, String code) throws IOException{  int verifySize = code.length();  BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);  Random rand = new Random();  Graphics2D g2 = image.createGraphics();  g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);  Color[] colors = new Color[5];  Color[] colorSpaces = new Color[] { Color.WHITE, Color.CYAN,    Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE,    Color.PINK, Color.YELLOW };  float[] fractions = new float[colors.length];  for(int i = 0; i < colors.length; i++){   colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];   fractions[i] = rand.nextFloat();  }  Arrays.sort(fractions);     g2.setColor(Color.GRAY);// 设置边框色  g2.fillRect(0, 0, w, h);     Color c = getRandColor(200, 250);  g2.setColor(c);// 设置背景色  g2.fillRect(0, 2, w, h-4);     //绘制干扰线  Random random = new Random();  g2.setColor(getRandColor(160, 200));// 设置线条的颜色  for (int i = 0; i < 20; i++) {   int x = random.nextInt(w - 1);   int y = random.nextInt(h - 1);   int xl = random.nextInt(6) + 1;   int yl = random.nextInt(12) + 1;   g2.drawLine(x, y, x + xl + 40, y + yl + 20);  }     // 添加噪点  float yawpRate = 0.05f;// 噪声率  int area = (int) (yawpRate * w * h);  for (int i = 0; i < area; i++) {   int x = random.nextInt(w);   int y = random.nextInt(h);   int rgb = getRandomIntColor();   image.setRGB(x, y, rgb);  }     shear(g2, w, h, c);// 使图片扭曲   g2.setColor(getRandColor(100, 160));  int fontSize = h-4;  Font font = new Font("Algerian", Font.ITALIC, fontSize);  g2.setFont(font);  char[] chars = code.toCharArray();  for(int i = 0; i < verifySize; i++){   AffineTransform affine = new AffineTransform();   affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (w / verifySize) * i + fontSize/2, h/2);   g2.setTransform(affine);   g2.drawChars(chars, i, 1, ((w-10) / verifySize) * i + 5, h/2 + fontSize/2 - 10);  }     g2.dispose();  ImageIO.write(image, "jpg", os); }   private static Color getRandColor(int fc, int bc) {  if (fc > 255)   fc = 255;  if (bc > 255)   bc = 255;  int r = fc + random.nextInt(bc - fc);  int g = fc + random.nextInt(bc - fc);  int b = fc + random.nextInt(bc - fc);  return new Color(r, g, b); }   private static int getRandomIntColor() {  int[] rgb = getRandomRgb();  int color = 0;  for (int c : rgb) {   color = color << 8;   color = color | c;  }  return color; }   private static int[] getRandomRgb() {  int[] rgb = new int[3];  for (int i = 0; i < 3; i++) {   rgb[i] = random.nextInt(255);  }  return rgb; }  private static void shear(Graphics g, int w1, int h1, Color color) {  shearX(g, w1, h1, color);  shearY(g, w1, h1, color); }   private static void shearX(Graphics g, int w1, int h1, Color color) {   int period = random.nextInt(2);   boolean borderGap = true;  int frames = 1;  int phase = random.nextInt(2);   for (int i = 0; i < h1; i++) {   double d = (double) (period >> 1)     * Math.sin((double) i / (double) period       + (6.2831853071795862D * (double) phase)       / (double) frames);   g.copyArea(0, i, w1, 1, (int) d, 0);   if (borderGap) {    g.setColor(color);    g.drawLine((int) d, i, 0, i);    g.drawLine((int) d + w1, i, w1, i);   }  }  }  private static void shearY(Graphics g, int w1, int h1, Color color) {   int period = random.nextInt(40) + 10; // 50;   boolean borderGap = true;  int frames = 20;  int phase = 7;  for (int i = 0; i < w1; i++) {   double d = (double) (period >> 1)     * Math.sin((double) i / (double) period       + (6.2831853071795862D * (double) phase)       / (double) frames);   g.copyArea(i, 0, 1, h1, 0, (int) d);   if (borderGap) {    g.setColor(color);    g.drawLine(i, (int) d, i, 0);    g.drawLine(i, (int) d + h1, i, h1);   }   }  } public static void main(String[] args) throws IOException{  File dir = new File("F:/verifies");  int w = 200, h = 80;  for(int i = 0; i < 50; i++){   String verifyCode = generateVerifyCode(4);   File file = new File(dir, verifyCode + ".jpg");   outputImage(w, h, file, verifyCode);  } }}

  <servlet>   <servlet-name>AuthImage</servlet-name>   <servlet-class>hh.com.util.AuthImage</servlet-class>  </servlet>  <servlet-mapping>   <servlet-name>AuthImage</servlet-name>  <url-pattern>/authImage</url-pattern>  </servlet-mapping>