Java实现图片验证码源码

  1   /*
  2 
  3     * To change this template, choose Tools | Templates * and open the template in the editor.
  4 
  5     */
  6 
  7     package com.wind.util;
  8 
  9     import java.awt.BasicStroke;
 10 
 11     import java.awt.Color; import java.awt.Font;
 12 
 13     import java.awt.Graphics; import java.awt.Graphics2D;
 14 
 15     import java.awt.geom.AffineTransform;
 16 
 17     import java.awt.geom.Line2D;
 18 
 19     import java.awt.image.BufferedImage;
 20 
 21     import java.io.ByteArrayInputStream;
 22 
 23     import java.io.ByteArrayOutputStream;
 24 
 25     import java.io.IOException;
 26 
 27     import java.util.Random;
 28 
 29     import javax.imageio.ImageIO;
 30 
 31     import javax.imageio.stream.ImageOutputStream;
 32 
 33     /**
 34 
 35     *
 36 
 37     * @author zyong
 38 
 39     *验证码
 40 
 41     */
 42 
 43     public class CheckCode {
 44 
 45     /**
 46 
 47     *创建一个随机数对象
 48 
 49     */
 50 
 51     Random random = new Random();
 52 
 53     /**
 54 
 55     *生成的字符集
 56 
 57     */
 58 
 59     private final String character = "0ABC1DEF2GHI3JKL4MNO5PQR6ST7UV8WX9YZ";
 60 
 61     /**
 62 
 63     *返回生成后的图片字符
 64 
 65     */
 66 
 67     private String checkCode;
 68 
 69     /**
 70 
 71     * 设置生成图片的宽度,默认为65
 72 
 73     */
 74 
 75     private int width = 65;
 76 
 77     /**
 78 
 79     * 设置生成图片的高度,默认为25
 80 
 81     */
 82 
 83     private int height = 25;
 84 
 85     /**
 86 
 87     * 设置图片的类型,默认为BufferedImage.TYPE_INT_RGB
 88 
 89     */
 90 
 91     private int imageType = BufferedImage.TYPE_INT_RGB;
 92 
 93     /**
 94 
 95     *
 96 
 97     * @return生成图片后的字符
 98 
 99     */
100 
101     public String getCheckCode() {
102 
103     return checkCode;
104 
105     }
106 
107     /**
108 
109     *
110 
111     * @return图片的高度
112 
113     */
114 
115     public int getHeight() {
116 
117     return height;
118 
119     }
120 
121     /**
122 
123     *
124 
125     * @param height图片的高度
126 
127     */
128 
129     public void setHeight(int height) {
130 
131     this.height = height;
132 
133     }
134 
135     /**
136 
137     *
138 
139    * @return图片的宽度
140 
141     */
142 
143     public int getWidth() {
144 
145     return width;
146 
147     }
148 
149     /**
150 
151     *
152 
153     * @param width图片的宽度
154 
155     */
156 
157     public void setWidth(int width) {
158 
159     this.width = width;
160 
161     }
162 
163     /**
164 
165     *
166 
167     * @return图片类型
168 
169     */
170 
171     public int getImageType() {
172 
173     return imageType;
174 
175     }
176 
177     /**
178 
179     *
180 
181     * @param imageType图片类型
182 
183     */
184 
185     public void setImageType(int imageType) {
186 
187     this.imageType = imageType;
188 
189     }
190 
191     /**
192 
193     *
194 
195     * @return生成一张图片
196 
197     */
198 
199     public ByteArrayInputStream buildImage() {
200 
201     BufferedImage image = new BufferedImage(this.width, this.height, this.imageType);
202 
203     Graphics g = image.getGraphics();
204 
205     Graphics2D g2d = (Graphics2D) g;
206 
207     g.setColor(this.getColor(200, 250));
208 
209    g.fillRect(0, 0, this.width, this.height);
210 
211     g.setFont(new Font("Times New Roman", Font.BOLD, 17));
212 
213     g.setColor(this.getColor(180, 200));
214 
215     /*
216 
217     *绘制100条干扰线
218 
219     */
220 
221     for (int i = 0; i < 100; i++) {
222 
223     int x1 = random.nextInt(this.width);
224 
225     int y1 = random.nextInt(this.height);
226 
227     int x2 = random.nextInt(this.width - 3);
228 
229     int y2 = random.nextInt(this.height - 3);
230 
231     BasicStroke bs = new BasicStroke(2f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL);
232 
233     Line2D line = new Line2D.Double(x1, y1, x2, y2);
234 
235     g2d.setStroke(bs);
236 
237     g2d.draw(line);
238 
239     g.setColor(getColor(180, 222));
240 
241     }
242 
243     StringBuffer codeStr = new StringBuffer();
244 
245     for (int i = 0; i < 4; i++) {
246 
247     char c = character.charAt(random.nextInt(36));
248 
249     codeStr.append(c);
250 
251     Color color = new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110));
252 
253     g.setColor(color); /*随机文字,旋转文字到指定角度*/
254 
255    AffineTransform trans = new AffineTransform();
256 
257     trans.rotate(random.nextInt(10) * i + 3, 5);
258 
259     float scaleSize = random.nextFloat() + 0.5f;
260 
261     if (scaleSize < 0.8 || scaleSize > 1.1f) {
262 
263     scaleSize = 1f;
264 
265     }
266 
267     trans.scale(scaleSize, scaleSize); g2d.setTransform(trans);
268 
269     g.drawString(String.valueOf(c), 15 * i + 6, 9);
270 
271     }
272 
273     this.checkCode = codeStr.toString(); g.dispose();
274 
275     ByteArrayInputStream inputStream = null;
276 
277     ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
278 
279     try {
280 
281     ImageOutputStream imgOutput = ImageIO.createImageOutputStream(outputStream);
282 
283     ImageIO.write(image, "JPEG", imgOutput);
284 
285     imgOutput.close();
286 
287     inputStream = new ByteArrayInputStream(outputStream.toByteArray());
288 
289     outputStream.close();
290 
291     } catch (IOException e) {
292 
293     e.printStackTrace();
294 
295     }
296 
297     return inputStream;
298 
299     }
300 
301     /**
302 
303     * 利用随机数，随机生成一个Color颜色的对象
304 
305     * @param fc
306 
307     * @param bc
308 
309     * @return颜色对象
310 
311     */
312 
313     private Color getColor(int fc, int bc) {
314 
315     if (fc > 255) {
316 
317     fc = 255;
318 
319     }
320 
321     if (bc > 255) {
322 
323     bc = 255;
324 
325     }
326 
327     int r = fc + random.nextInt(bc - fc);
328 
329     int g = fc + random.nextInt(bc - fc);
330 
331     int b = fc + random.nextInt(bc - fc);
332 
333     return new Color(r, g, b);
334 
335     }
336 
337     }
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