1 package cn.gp.tools;  2 import java.awt.*;  3 import java.awt.image.BufferedImage;  4 import java.io.*;  5 import java.util.Random;  6 import javax.imageio.ImageIO;  7 /**  8  * int width = 70, height = 30;  9  * 验证码的w=70 h=30   用Label来接收 10  * @author 小风微灵 11  * 12  */ 13 public class ValidationCode { 14      15  16      17     /** 18      * 获取随机颜色值 19      * @param minColor 20      * @param maxColor 21      * @return 22      */ 23     private static Color getRandomColor(int minColor, int maxColor) { 24          25         Random random = new Random(); 26         // 保存minColor最大不会超过255 27         if (minColor > 255) 28             minColor = 255; 29         // 保存minColor最大不会超过255 30         if (maxColor > 255) 31             maxColor = 255; 32         // 获得红色的随机颜色值 33         int red = minColor + random.nextInt(maxColor - minColor); 34         // 获得绿色的随机颜色值 35         int green = minColor + random.nextInt(maxColor - minColor); 36         // 获得蓝色的随机颜色值 37         int blue = minColor + random.nextInt(maxColor - minColor); 38         return new Color(red, green, blue); 39      40     } 41      42     public static String getValidationCode() throws IOException { 43          44         // 用于保存最后随机生成的验证码 45         StringBuilder validationCode = new StringBuilder(); 46          47         try { 48              49             // 设置图形验证码的长和宽（图形的大小） 50                 int width = 70, height = 30; 51                 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);                 52                 Graphics g = image.getGraphics();// 获得用于输出文字的Graphics对象 53                 Random random = new Random(); 54                 g.setColor(getRandomColor(180, 250));// 随机设置要填充的颜色 55                 g.fillRect(0, 0, width, height);// 填充图形背景 56             // 设置初始字体 57                 g.setFont(new Font("Times New Roman", Font.ITALIC, height)); 58                 g.setColor(getRandomColor(120, 180));// 随机设置字体颜色 59              60             //干扰线 61                 for(int i=0;i<155;i++){ 62                     int x=random.nextInt(width); 63                     int y=random.nextInt(height); 64                     int x1=random.nextInt(width); 65                     int y1=random.nextInt(height); 66                     g.drawLine(x, y, x+x1, y+y1); 67                 } 68              69             // 随机生成4个验证码 70                 for (int i = 0; i < 4; i++) { 71                     // 随机设置当前验证码的字符的字体 72                     g.setFont(Constant.fonts[RandomUtil.getRandomInt(Constant.fonts.length-1)]); 73                     // 随机获得当前验证码的字符串 74                     String code=Constant.srcStrings[RandomUtil.getRandomInt(61)]; 75                     validationCode.append(code); 76                     // 随机设置当前验证码字符的颜色 77                     g.setColor(getRandomColor(10, 100)); 78                     // 在图形上输出验证码字符，x和y都是随机生成的 79                     g.drawString(code, 16 * i + random.nextInt(7), height - random.nextInt(6)); 80                 } 81                 //名称重置 82                  83              84                 String path=ImageUtil.getProgramPath(); 85                  86                 File file = new File(path+"validates/validatecode"+(++Constant.count)+".jpg");                 87                 ImageIO.write(image, "jpg", file); 88                  89                  90                 //删除旧 的验证图片 91                 File file2=new File(path+"validates/validatecode"+(Constant.count-1)+".jpg"); 92                 file2.delete(); 93                  94                  95                 g.dispose(); 96                  97             } catch (Exception e){ 98                 e.printStackTrace(); 99             }100             return validationCode.toString();    101         }102     103 }