1 package jf.utils;
2
3
4 import java.awt.Color;
5 import java.awt.Font;
6 import java.awt.Graphics;
7 import java.awt.Graphics2D;
8 import java.awt.RenderingHints;
9 import java.awt.geom.AffineTransform;
10 import java.awt.image.BufferedImage;
11 import java.io.File;
12 import java.io.FileOutputStream;
13 import java.io.IOException;
14 import java.io.OutputStream;
15 import java.util.Arrays;
16 import java.util.Random;
17
18
19 import javax.imageio.ImageIO;
20
21
22 /**
23 * 生成验证码图片的工具类
24 *
25 */
26 public class VerifyCodeUtils {
27
28
29 // 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
30 public static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ";
31 private static Random random = new Random();
32
33
34 /**
35 * 使用系统默认字符源生成验证码
36 *
37 * @param verifySize 验证码长度
38 * @return
39 */
40 public static String generateVerifyCode(int verifySize) {
41 return generateVerifyCode(verifySize, VERIFY_CODES);
42 }
43
44
45 /**
46 * 使用指定源生成验证码
47 *
48 * @param verifySize 验证码长度
49 * @param sources 验证码字符源
50 * @return
51 */
52 public static String generateVerifyCode(int verifySize, String sources) {
53 if (sources == null || sources.length() == 0) {
54 sources = VERIFY_CODES;
55 }
56 int codesLen = sources.length();
57 Random rand = new Random(System.currentTimeMillis());
58 StringBuilder verifyCode = new StringBuilder(verifySize);
59 for (int i = 0; i < verifySize; i++) {
60 verifyCode.append(sources.charAt(rand.nextInt(codesLen - 1)));
61 }
62 return verifyCode.toString();
63 }
64
65
66 /**
67 * 生成随机验证码文件,并返回验证码值
68 *
69 * @param w
70 * @param h
71 * @param outputFile
72 * @param verifySize
73 * @return
74 * @throws IOException
75 */
76 public static String outputVerifyImage(int w, int h, File outputFile, int verifySize) throws IOException {
77 String verifyCode = generateVerifyCode(verifySize);
78 outputImage(w, h, outputFile, verifyCode);
79 return verifyCode;
80 }
81
82
83 /**
84 * 输出随机验证码图片流,并返回验证码值
85 *
86 * @param w
87 * @param h
88 * @param os
89 * @param verifySize
90 * @return
91 * @throws IOException
92 */
93 public static String outputVerifyImage(int w, int h, OutputStream os, int verifySize) throws IOException {
94 String verifyCode = generateVerifyCode(verifySize);
95 outputImage(w, h, os, verifyCode);
96 return verifyCode;
97 }
98
99
100 /**
101 * 生成指定验证码图像文件
102 *
103 * @param w
104 * @param h
105 * @param outputFile
106 * @param code
107 * @throws IOException
108 */
109 public static void outputImage(int w, int h, File outputFile, String code) throws IOException {
110 if (outputFile == null) {
111 return;
112 }
113 File dir = outputFile.getParentFile();
114 if (!dir.exists()) {
115 dir.mkdirs();
116 }
117 try {
118 outputFile.createNewFile();
119 FileOutputStream fos = new FileOutputStream(outputFile);
120 outputImage(w, h, fos, code);
121 fos.close();
122 } catch (IOException e) {
123 throw e;
124 }
125 }
126
127
128 /**
129 * 输出指定验证码图片流
130 *
131 * @param w
132 * @param h
133 * @param os
134 * @param code
135 * @throws IOException
136 */
137 public static void outputImage(int w, int h, OutputStream os, String code) throws IOException {
138 int verifySize = code.length();
139 BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
140 Random rand = new Random();
141 Graphics2D g2 = image.createGraphics();
142 g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
143 Color[] colors = new Color[5];
144 Color[] colorSpaces = new Color[] { Color.WHITE, Color.CYAN, Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA,
145 Color.ORANGE, Color.PINK, Color.YELLOW };
146 float[] fractions = new float[colors.length];
147 for (int i = 0; i < colors.length; i++) {
148 colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];
149 fractions[i] = rand.nextFloat();
150 }
151 Arrays.sort(fractions);
152
153 g2.setColor(Color.GRAY);// 设置边框色
154 g2.fillRect(0, 0, w, h);
155
156 Color c = getRandColor(200, 250);
157 g2.setColor(c);// 设置背景色
158 g2.fillRect(0, 2, w, h - 4);
159
160 // 绘制干扰线
161 Random random = new Random();
162 g2.setColor(getRandColor(160, 200));// 设置线条的颜色
163 for (int i = 0; i < 20; i++) {
164 int x = random.nextInt(w - 1);
165 int y = random.nextInt(h - 1);
166 int xl = random.nextInt(6) + 1;
167 int yl = random.nextInt(12) + 1;
168 g2.drawLine(x, y, x + xl + 40, y + yl + 20);
169 }
170
171 // 添加噪点
172 float yawpRate = 0.05f;// 噪声率
173 int area = (int) (yawpRate * w * h);
174 for (int i = 0; i < area; i++) {
175 int x = random.nextInt(w);
176 int y = random.nextInt(h);
177 int rgb = getRandomIntColor();
178 image.setRGB(x, y, rgb);
179 }
180
181 shear(g2, w, h, c);// 使图片扭曲
182
183 g2.setColor(getRandColor(100, 160));
184 int fontSize = h - 4;
185 Font font = new Font("Algerian", Font.ITALIC, fontSize);
186 g2.setFont(font);
187 char[] chars = code.toCharArray();
188 for (int i = 0; i < verifySize; i++) {
189 AffineTransform affine = new AffineTransform();
190 affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1),
191 (w / verifySize) * i + fontSize / 2, h / 2);
192 g2.setTransform(affine);
193 g2.drawChars(chars, i, 1, ((w - 10) / verifySize) * i + 5, h / 2 + fontSize / 2 - 10);
194 }
195
196 g2.dispose();
197 ImageIO.write(image, "jpg", os);
198 }
199
200
201 private static Color getRandColor(int fc, int bc) {
202 if (fc > 255)
203 fc = 255;
204 if (bc > 255)
205 bc = 255;
206 int r = fc + random.nextInt(bc - fc);
207 int g = fc + random.nextInt(bc - fc);
208 int b = fc + random.nextInt(bc - fc);
209 return new Color(r, g, b);
210 }
211
212
213 private static int getRandomIntColor() {
214 int[] rgb = getRandomRgb();
215 int color = 0;
216 for (int c : rgb) {
217 color = color << 8;
218 color = color | c;
219 }
220 return color;
221 }
222
223
224 private static int[] getRandomRgb() {
225 int[] rgb = new int[3];
226 for (int i = 0; i < 3; i++) {
227 rgb[i] = random.nextInt(255);
228 }
229 return rgb;
230 }
231
232
233 private static void shear(Graphics g, int w1, int h1, Color color) {
234 shearX(g, w1, h1, color);
235 shearY(g, w1, h1, color);
236 }
237
238
239 private static void shearX(Graphics g, int w1, int h1, Color color) {
240 int period = random.nextInt(2);
241
242 boolean borderGap = true;
243 int frames = 1;
244 int phase = random.nextInt(2);
245
246 for (int i = 0; i < h1; i++) {
247 double d = (double) (period >> 1)
248 * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
249 g.copyArea(0, i, w1, 1, (int) d, 0);
250 if (borderGap) {
251 g.setColor(color);
252 g.drawLine((int) d, i, 0, i);
253 g.drawLine((int) d + w1, i, w1, i);
254 }
255 }
256 }
257
258
259 private static void shearY(Graphics g, int w1, int h1, Color color) {
260 int period = random.nextInt(40) + 10; // 50;
261
262 boolean borderGap = true;
263 int frames = 20;
264 int phase = 7;
265 for (int i = 0; i < w1; i++) {
266 double d = (double) (period >> 1)
267 * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
268 g.copyArea(i, 0, 1, h1, 0, (int) d);
269 if (borderGap) {
270 g.setColor(color);
271 g.drawLine(i, (int) d, i, 0);
272 g.drawLine(i, (int) d + h1, i, h1);
273 }
274 }
275 }
276
277
278 //生成一张验证码图片，并保存到项目的verifyCodeImg文件夹下
279 @SuppressWarnings("finally")
280 public static String createOneCodeImage(){
281 String imgName = "";
282 try {
283 File dir = new File("./verifyCodeImg");
284 int w = 95, h = 50;
285 String verifyCode = generateVerifyCode(4);
286 File file = new File(dir, verifyCode + ".jpg");
287 outputImage(w, h, file, verifyCode);
288 imgName = verifyCode;
289 } catch (IOException e) {
290 imgName = "";
291 e.printStackTrace();
292 }finally{
293 return imgName;
294 }
295 }
296
297
298 public static void main(String[] args) throws IOException {
299 String codeImage = VerifyCodeUtils.createOneCodeImage();
300 System.out.println(codeImage);
301 }
302
303 }
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