Java生成圖片驗證碼(有點仿QQ驗證碼的意思)

看了挺多圖片驗證碼的代碼，感受沒什麼長的好看點的，就本身動手寫了個，寫完發現跟QQ的有幾分類似，比較滿意。

功能包括：自定義圖片尺寸和字符長度，隨機背景顏色和字符顏色，隨機字符偏移角度，字符平滑邊緣，干擾線，噪點，背景扭曲。

原本想作字符扭曲的，不知道怎的先生成文字再扭曲就報錯了，先就這樣吧，但願有高手能幫助修正一下。

須要說明的是之因此有幾分像QQ的驗證碼感受是由於這個Algerian字體，若是系統沒有的話須要自行安裝，百度搜字體名能下載到，丟系統Fonts文件夾就行。

JAVA文件和字體打了個包發資源裏了，http://download.csdn.net/detail/ruixue0117/7138469。

效果圖：

 

AuthImage類:

 1 package hh.com.util;
 2 
 3 import java.io.IOException;
 4 
 5 import javax.servlet.ServletException;
 6 import javax.servlet.http.HttpServletRequest;
 7 import javax.servlet.http.HttpServletResponse;
 8 import javax.servlet.http.HttpSession;
 9 
10 public class AuthImage extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
11     static final long serialVersionUID = 1L;
12 
13     public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
14         response.setHeader("Pragma", "No-cache");
15         response.setHeader("Cache-Control", "no-cache");
16         response.setDateHeader("Expires", 0);
17         response.setContentType("image/jpeg");
18         
19         //生成隨機字串
20         String verifyCode = VerifyCodeUtils.generateVerifyCode(4);
21         //存入會話session
22         HttpSession session = request.getSession(true);
23         session.setAttribute("rand", verifyCode.toLowerCase());
24         //生成圖片
25         int w = 200, h = 80;
26         VerifyCodeUtils.outputImage(w, h, response.getOutputStream(), verifyCode);
27 
28     }
29 }

 

VerifyCodeUtils類(main方法可直接執行):

  1 package hh.com.util;
  2 
  3 import java.awt.Color;
  4 import java.awt.Font;
  5 import java.awt.Graphics;
  6 import java.awt.Graphics2D;
  7 import java.awt.LinearGradientPaint;
  8 import java.awt.Paint;
  9 import java.awt.RenderingHints;
 10 import java.awt.geom.AffineTransform;
 11 import java.awt.image.BufferedImage;
 12 import java.io.File;
 13 import java.io.FileOutputStream;
 14 import java.io.IOException;
 15 import java.io.OutputStream;
 16 import java.util.Arrays;
 17 import java.util.Random;
 18 
 19 import javax.imageio.ImageIO;
 20 
 21 public class VerifyCodeUtils{
 22 
 23     //使用到Algerian字體，系統裏沒有的話須要安裝字體，字體只顯示大寫，去掉了1,0,i,o幾個容易混淆的字符
 24     public static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ";
 25     private static Random random = new Random();
 26 
 27 
 28     /**
 29      * 使用系統默認字符源生成驗證碼
 30      * @param verifySize    驗證碼長度
 31      * @return
 32      */
 33     public static String generateVerifyCode(int verifySize){
 34         return generateVerifyCode(verifySize, VERIFY_CODES);
 35     }
 36     /**
 37      * 使用指定源生成驗證碼
 38      * @param verifySize    驗證碼長度
 39      * @param sources    驗證碼字符源
 40      * @return
 41      */
 42     public static String generateVerifyCode(int verifySize, String sources){
 43         if(sources == null || sources.length() == 0){
 44             sources = VERIFY_CODES;
 45         }
 46         int codesLen = sources.length();
 47         Random rand = new Random(System.currentTimeMillis());
 48         StringBuilder verifyCode = new StringBuilder(verifySize);
 49         for(int i = 0; i < verifySize; i++){
 50             verifyCode.append(sources.charAt(rand.nextInt(codesLen-1)));
 51         }
 52         return verifyCode.toString();
 53     }
 54     
 55     /**
 56      * 生成隨機驗證碼文件,並返回驗證碼值
 57      * @param w
 58      * @param h
 59      * @param outputFile
 60      * @param verifySize
 61      * @return
 62      * @throws IOException
 63      */
 64     public static String outputVerifyImage(int w, int h, File outputFile, int verifySize) throws IOException{
 65         String verifyCode = generateVerifyCode(verifySize);
 66         outputImage(w, h, outputFile, verifyCode);
 67         return verifyCode;
 68     }
 69     
 70     /**
 71      * 輸出隨機驗證碼圖片流,並返回驗證碼值
 72      * @param w
 73      * @param h
 74      * @param os
 75      * @param verifySize
 76      * @return
 77      * @throws IOException
 78      */
 79     public static String outputVerifyImage(int w, int h, OutputStream os, int verifySize) throws IOException{
 80         String verifyCode = generateVerifyCode(verifySize);
 81         outputImage(w, h, os, verifyCode);
 82         return verifyCode;
 83     }
 84     
 85     /**
 86      * 生成指定驗證碼圖像文件
 87      * @param w
 88      * @param h
 89      * @param outputFile
 90      * @param code
 91      * @throws IOException
 92      */
 93     public static void outputImage(int w, int h, File outputFile, String code) throws IOException{
 94         if(outputFile == null){
 95             return;
 96         }
 97         File dir = outputFile.getParentFile();
 98         if(!dir.exists()){
 99             dir.mkdirs();
100         }
101         try{
102             outputFile.createNewFile();
103             FileOutputStream fos = new FileOutputStream(outputFile);
104             outputImage(w, h, fos, code);
105             fos.close();
106         } catch(IOException e){
107             throw e;
108         }
109     }
110     
111     /**
112      * 輸出指定驗證碼圖片流
113      * @param w
114      * @param h
115      * @param os
116      * @param code
117      * @throws IOException
118      */
119     public static void outputImage(int w, int h, OutputStream os, String code) throws IOException{
120         int verifySize = code.length();
121         BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
122         Random rand = new Random();
123         Graphics2D g2 = image.createGraphics();
124         g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
125         Color[] colors = new Color[5];
126         Color[] colorSpaces = new Color[] { Color.WHITE, Color.CYAN,
127                 Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE,
128                 Color.PINK, Color.YELLOW };
129         float[] fractions = new float[colors.length];
130         for(int i = 0; i < colors.length; i++){
131             colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];
132             fractions[i] = rand.nextFloat();
133         }
134         Arrays.sort(fractions);
135         
136         g2.setColor(Color.GRAY);// 設置邊框色
137         g2.fillRect(0, 0, w, h);
138         
139         Color c = getRandColor(200, 250);
140         g2.setColor(c);// 設置背景色
141         g2.fillRect(0, 2, w, h-4);
142         
143         //繪製干擾線
144         Random random = new Random();
145         g2.setColor(getRandColor(160, 200));// 設置線條的顏色
146         for (int i = 0; i < 20; i++) {
147             int x = random.nextInt(w - 1);
148             int y = random.nextInt(h - 1);
149             int xl = random.nextInt(6) + 1;
150             int yl = random.nextInt(12) + 1;
151             g2.drawLine(x, y, x + xl + 40, y + yl + 20);
152         }
153         
154         // 添加噪點
155         float yawpRate = 0.05f;// 噪聲率
156         int area = (int) (yawpRate * w * h);
157         for (int i = 0; i < area; i++) {
158             int x = random.nextInt(w);
159             int y = random.nextInt(h);
160             int rgb = getRandomIntColor();
161             image.setRGB(x, y, rgb);
162         }
163         
164         shear(g2, w, h, c);// 使圖片扭曲
165 
166         g2.setColor(getRandColor(100, 160));
167         int fontSize = h-4;
168         Font font = new Font("Algerian", Font.ITALIC, fontSize);
169         g2.setFont(font);
170         char[] chars = code.toCharArray();
171         for(int i = 0; i < verifySize; i++){
172             AffineTransform affine = new AffineTransform();
173             affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (w / verifySize) * i + fontSize/2, h/2);
174             g2.setTransform(affine);
175             g2.drawChars(chars, i, 1, ((w-10) / verifySize) * i + 5, h/2 + fontSize/2 - 10);
176         }
177         
178         g2.dispose();
179         ImageIO.write(image, "jpg", os);
180     }
181     
182     private static Color getRandColor(int fc, int bc) {
183         if (fc > 255)
184             fc = 255;
185         if (bc > 255)
186             bc = 255;
187         int r = fc + random.nextInt(bc - fc);
188         int g = fc + random.nextInt(bc - fc);
189         int b = fc + random.nextInt(bc - fc);
190         return new Color(r, g, b);
191     }
192     
193     private static int getRandomIntColor() {
194         int[] rgb = getRandomRgb();
195         int color = 0;
196         for (int c : rgb) {
197             color = color << 8;
198             color = color | c;
199         }
200         return color;
201     }
202     
203     private static int[] getRandomRgb() {
204         int[] rgb = new int[3];
205         for (int i = 0; i < 3; i++) {
206             rgb[i] = random.nextInt(255);
207         }
208         return rgb;
209     }
210 
211     private static void shear(Graphics g, int w1, int h1, Color color) {
212         shearX(g, w1, h1, color);
213         shearY(g, w1, h1, color);
214     }
215     
216     private static void shearX(Graphics g, int w1, int h1, Color color) {
217 
218         int period = random.nextInt(2);
219 
220         boolean borderGap = true;
221         int frames = 1;
222         int phase = random.nextInt(2);
223 
224         for (int i = 0; i < h1; i++) {
225             double d = (double) (period >> 1)
226                     * Math.sin((double) i / (double) period
227                             + (6.2831853071795862D * (double) phase)
228                             / (double) frames);
229             g.copyArea(0, i, w1, 1, (int) d, 0);
230             if (borderGap) {
231                 g.setColor(color);
232                 g.drawLine((int) d, i, 0, i);
233                 g.drawLine((int) d + w1, i, w1, i);
234             }
235         }
236 
237     }
238 
239     private static void shearY(Graphics g, int w1, int h1, Color color) {
240 
241         int period = random.nextInt(40) + 10; // 50;
242 
243         boolean borderGap = true;
244         int frames = 20;
245         int phase = 7;
246         for (int i = 0; i < w1; i++) {
247             double d = (double) (period >> 1)
248                     * Math.sin((double) i / (double) period
249                             + (6.2831853071795862D * (double) phase)
250                             / (double) frames);
251             g.copyArea(i, 0, 1, h1, 0, (int) d);
252             if (borderGap) {
253                 g.setColor(color);
254                 g.drawLine(i, (int) d, i, 0);
255                 g.drawLine(i, (int) d + h1, i, h1);
256             }
257 
258         }
259 
260     }
261     public static void main(String[] args) throws IOException{
262         File dir = new File("F:/verifies");
263         int w = 200, h = 80;
264         for(int i = 0; i < 50; i++){
265             String verifyCode = generateVerifyCode(4);
266             File file = new File(dir, verifyCode + ".jpg");
267             outputImage(w, h, file, verifyCode);
268         }
269     }
270 }

 

web.xml配置:

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