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engd
10年前发布

Java生成验证码

import java.awt.*;  import java.awt.image.BufferedImage;  import java.io.*;  import java.util.Random;  import javax.imageio.ImageIO;     public class ValidationCode {         // 图形验证码的字符集合,系统将随机从这个字符串中选择一些字符作为验证码      private static String codeChars = "%#23456789abcdefghkmnpqrstuvwxyzABCDEFGHKLMNPQRSTUVWXYZ";         // 返回一个随机颜色(Color对象)      private static Color getRandomColor(int minColor, int maxColor) {          Random random = new Random();          // 保存minColor最大不会超过255          if (minColor > 255)              minColor = 255;          // 保存minColor最大不会超过255          if (maxColor > 255)              maxColor = 255;          // 获得红色的随机颜色值          int red = minColor + random.nextInt(maxColor - minColor);          // 获得绿色的随机颜色值          int green = minColor + random.nextInt(maxColor - minColor);          // 获得蓝色的随机颜色值          int blue = minColor + random.nextInt(maxColor - minColor);          return new Color(red, green, blue);      }         protected static void getValidationCode() throws IOException {          try {              // 获得验证码集合的长度              int charsLength = codeChars.length();              // 设置图形验证码的长和宽(图形的大小)              int width = 90, height = 30;              BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);              Graphics g = image.getGraphics();// 获得用于输出文字的Graphics对象              Random random = new Random();              g.setColor(getRandomColor(180, 250));// 随机设置要填充的颜色              g.fillRect(0, 0, width, height);// 填充图形背景              // 设置初始字体              g.setFont(new Font("Times New Roman", Font.ITALIC, height));              g.setColor(getRandomColor(120, 180));// 随机设置字体颜色              // 用于保存最后随机生成的验证码              StringBuilder validationCode = new StringBuilder();              // 验证码的随机字体              String[] fontNames = { "Times New Roman", "Book antiqua", "Arial" };              // 随机生成3个到5个验证码              for (int i = 0; i < 3 + random.nextInt(3); i++) {                  // 随机设置当前验证码的字符的字体                  g.setFont(new Font(fontNames[random.nextInt(3)], Font.ITALIC, height));                  // 随机获得当前验证码的字符                  char codeChar = codeChars.charAt(random.nextInt(charsLength));                  validationCode.append(codeChar);                  // 随机设置当前验证码字符的颜色                  g.setColor(getRandomColor(10, 100));                  // 在图形上输出验证码字符,x和y都是随机生成的                  g.drawString(String.valueOf(codeChar), 16 * i + random.nextInt(7), height - random.nextInt(6));              }              File file = new File("d:\\code.png");                ImageIO.write(image, "png", file);                System.out.println(validationCode.toString());              //byte[] data = ((DataBufferByte) image.getData().getDataBuffer()).getData();              g.dispose();          } catch (Exception e) {              e.printStackTrace();            }      }         public static void main(String[] args) throws IOException{          getValidationCode();      }  }