验证码生成器：
1 package com.lz.Tools;
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.image.BufferedImage;
8 import java.util.Random;
9
10 /**
11 * 验证码生成器
12 *
13 * @author bojiangzhou
14 */
15 public class VCodeGenerator {
16
17 /**
18 * 验证码来源
19 */
20 final private char[] code = {
21 ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘,
22 ‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘, ‘g‘, ‘h‘, ‘i‘, ‘j‘,
23 ‘k‘, ‘m‘, ‘n‘, ‘p‘, ‘q‘, ‘r‘, ‘s‘, ‘t‘, ‘u‘, ‘v‘,
24 ‘w‘, ‘x‘, ‘y‘, ‘z‘, ‘A‘, ‘B‘, ‘C‘, ‘D‘, ‘E‘, ‘F‘,
25 ‘G‘, ‘H‘, ‘J‘, ‘K‘, ‘L‘, ‘M‘, ‘N‘, ‘P‘, ‘Q‘, ‘R‘,
26 ‘S‘, ‘T‘, ‘U‘, ‘V‘, ‘W‘, ‘X‘, ‘Y‘, ‘Z‘
27 };
28 /**
29 * 字体
30 */
31 final private String[] fontNames = new String[]{
32 "黑体", "宋体", "Courier", "Arial",
33 "Verdana", "Times", "Tahoma", "Georgia"};
34 /**
35 * 字体样式
36 */
37 final private int[] fontStyles = new int[]{
38 Font.BOLD, Font.ITALIC|Font.BOLD
39 };
40
41 /**
42 * 验证码长度
43 * 默认4个字符
44 */
45 private int vcodeLen = 4;
46 /**
47 * 验证码图片字体大小
48 * 默认17
49 */
50 private int fontsize = 21;
51 /**
52 * 验证码图片宽度
53 */
54 private int width = (fontsize+1)*vcodeLen+10;
55 /**
56 * 验证码图片高度
57 */
58 private int height = fontsize+12;
59 /**
60 * 干扰线条数
61 * 默认3条
62 */
63 private int disturbline = 3;
64
65
66 public VCodeGenerator(){}
67
68 /**
69 * 指定验证码长度
70 * @param vcodeLen 验证码长度
71 */
72 public VCodeGenerator(int vcodeLen) {
73 this.vcodeLen = vcodeLen;
74 this.width = (fontsize+1)*vcodeLen+10;
75 }
76
77 /**
78 * 生成验证码图片
79 * @param vcode 要画的验证码
80 * @param drawline 是否画干扰线
81 * @return
82 */
83 public BufferedImage generatorVCodeImage(String vcode, boolean drawline){
84 //创建验证码图片
85 BufferedImage vcodeImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
86 Graphics g = vcodeImage.getGraphics();
87 //填充背景色
88 g.setColor(new Color(246, 240, 250));
89 g.fillRect(0, 0, width, height);
90 if(drawline){
91 drawDisturbLine(g);
92 }
93 //用于生成伪随机数
94 Random ran = new Random();
95 //在图片上画验证码
96 for(int i = 0;i < vcode.length();i++){
97 //设置字体
98 g.setFont(new Font(fontNames[ran.nextInt(fontNames.length)], fontStyles[ran.nextInt(fontStyles.length)], fontsize));
99 //随机生成颜色
100 g.setColor(getRandomColor());
101 //画验证码
102 g.drawString(vcode.charAt(i)+"", i*fontsize+10, fontsize+5);
103 }
104 //释放此图形的上下文以及它使用的所有系统资源
105 g.dispose();
106
107 return vcodeImage;
108 }
109 /**
110 * 获得旋转字体的验证码图片
111 * @param vcode
112 * @param drawline 是否画干扰线
113 * @return
114 */
115 public BufferedImage generatorRotateVCodeImage(String vcode, boolean drawline){
116 //创建验证码图片
117 BufferedImage rotateVcodeImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
118 Graphics2D g2d = rotateVcodeImage.createGraphics();
119 //填充背景色
120 g2d.setColor(new Color(246, 240, 250));
121 g2d.fillRect(0, 0, width, height);
122 if(drawline){
123 drawDisturbLine(g2d);
124 }
125 //在图片上画验证码
126 for(int i = 0;i < vcode.length();i++){
127 BufferedImage rotateImage = getRotateImage(vcode.charAt(i));
128 g2d.drawImage(rotateImage, null, (int) (this.height * 0.7) * i, 0);
129 }
130 g2d.dispose();
131 return rotateVcodeImage;
132 }
133 /**
134 * 生成验证码
135 * @return 验证码
136 */
137 public String generatorVCode(){
138 int len = code.length;
139 Random ran = new Random();
140 StringBuffer sb = new StringBuffer();
141 for(int i = 0;i < vcodeLen;i++){
142 int index = ran.nextInt(len);
143 sb.append(code[index]);
144 }
145 return sb.toString();
146 }
147 /**
148 * 为验证码图片画一些干扰线
149 * @param g
150 */
151 private void drawDisturbLine(Graphics g){
152 Random ran = new Random();
153 for(int i = 0;i < disturbline;i++){
154 int x1 = ran.nextInt(width);
155 int y1 = ran.nextInt(height);
156 int x2 = ran.nextInt(width);
157 int y2 = ran.nextInt(height);
158 g.setColor(getRandomColor());
159 //画干扰线
160 g.drawLine(x1, y1, x2, y2);
161 }
162 }
163 /**
164 * 获取一张旋转的图片
165 * @param c 要画的字符
166 * @return
167 */
168 private BufferedImage getRotateImage(char c){
169 BufferedImage rotateImage = new BufferedImage(height, height, BufferedImage.TYPE_INT_ARGB);
170 Graphics2D g2d = rotateImage.createGraphics();
171 //设置透明度为0
172 g2d.setColor(new Color(255, 255, 255, 0));
173 g2d.fillRect(0, 0, height, height);
174 Random ran = new Random();
175 g2d.setFont(new Font(fontNames[ran.nextInt(fontNames.length)], fontStyles[ran.nextInt(fontStyles.length)], fontsize));
176 g2d.setColor(getRandomColor());
177 double theta = getTheta();
178 //旋转图片
179 g2d.rotate(theta, height/2, height/2);
180 g2d.drawString(Character.toString(c), (height-fontsize)/2, fontsize+5);
181 g2d.dispose();
182
183 return rotateImage;
184 }
185 /**
186 * @return 返回一个随机颜色
187 */
188 private Color getRandomColor(){
189 Random ran = new Random();
190 return new Color(ran.nextInt(220), ran.nextInt(220), ran.nextInt(220));
191 }
192 /**
193 * @return 角度
194 */
195 private double getTheta(){
196 return ((int) (Math.random()*1000) % 2 == 0 ? -1 : 1)*Math.random();
197 }
198
199 /**
200 * @return 验证码字符个数
201 */
202 public int getVcodeLen() {
203 return vcodeLen;
204 }
205 /**
206 * 设置验证码字符个数
207 * @param vcodeLen
208 */
209 public void setVcodeLen(int vcodeLen) {
210 this.width = (fontsize+3)*vcodeLen+10;
211 this.vcodeLen = vcodeLen;
212 }
213 /**
214 * @return 字体大小
215 */
216 public int getFontsize() {
217 return fontsize;
218 }
219 /**
220 * 设置字体大小
221 * @param fontsize
222 */
223 public void setFontsize(int fontsize) {
224 this.width = (fontsize+3)*vcodeLen+10;
225 this.height = fontsize+15;
226 this.fontsize = fontsize;
227 }
228 /**
229 * @return 图片宽度
230 */
231 public int getWidth() {
232 return width;
233 }
234 /**
235 * 设置图片宽度
236 * @param width
237 */
238 public void setWidth(int width) {
239 this.width = width;
240 }
241 /**
242 * @return 图片高度
243 */
244 public int getHeight() {
245 return height;
246 }
247 /**
248 * 设置图片高度
249 * @param height
250 */
251 public void setHeight(int height) {
252 this.height = height;
253 }
254 /**
255 * @return 干扰线条数
256 */
257 public int getDisturbline() {
258 return disturbline;
259 }
260 /**
261 * 设置干扰线条数
262 * @param disturbline
263 */
264 public void setDisturbline(int disturbline) {
265 this.disturbline = disturbline;
266 }
267
268 }
在servlet里获取验证码
1 package com.lz.Servlet;
2
3 import java.awt.image.BufferedImage;
4 import java.io.IOException;
5
6 import javax.imageio.ImageIO;
7 import javax.servlet.ServletException;
8 import javax.servlet.http.HttpServlet;
9 import javax.servlet.http.HttpServletRequest;
10 import javax.servlet.http.HttpServletResponse;
11
12 import com.lz.Tools.VCodeGenerator;
13
14
15
16 /**
17 * 获取验证码
18 * @author bojiangzhou
19 *
20 */
21 public class GetVCodeServlet extends HttpServlet {
22
23 private static final long serialVersionUID = 3259532010990625726L;
24
25 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
26 //验证码不能缓存
27 response.setHeader("Expires", "-1");
28 response.setHeader("cache-control", "no-cahce");
29 response.setHeader("pragma", "no-cache");
30
31 VCodeGenerator vcg = new VCodeGenerator();
32 //取得验证码
33 String vcode = vcg.generatorVCode();
34 //获取验证码图片
35 // BufferedImage vcodeImage = vcg.generatorRotateVCodeImage(vcode, true);
36 BufferedImage vcodeImage = vcg.generatorVCodeImage(vcode, true);
37 //将验证码保存到session域对象
38 request.getSession().setAttribute("vcode", vcode);
39 //输出验证码图片
40 ImageIO.write(vcodeImage, "gif", response.getOutputStream());
41 }
42
43 }
前台在img标签里用src获取验证码图片即可
<img class="vcode" src="GetVCodeServlet" />
OK!!!
时间： 2024-12-18 17:41:35