Java產生驗證碼

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 1 import java.awt.*; 2 import java.awt.image.BufferedImage; 3 import java.io.*; 4 import java.util.Random; 5 import javax.imageio.ImageIO; 6   7 public class ValidationCode { 8   9     // 圖形驗證碼的字元集合，系統將隨機從這個字串中選擇一些字元作為驗證碼10     private static String codeChars = "%#23456789abcdefghkmnpqrstuvwxyzABCDEFGHKLMNPQRSTUVWXYZ";11  12     // 返回一個隨機顏色（Color對象）13     private static Color getRandomColor(int minColor, int maxColor) {14         Random random = new Random();15         // 儲存minColor最大不會超過25516         if (minColor > 255)17             minColor = 255;18         // 儲存minColor最大不會超過25519         if (maxColor > 255)20             maxColor = 255;21         // 獲得紅色的隨機顏色值22         int red = minColor + random.nextInt(maxColor - minColor);23         // 獲得綠色的隨機顏色值24         int green = minColor + random.nextInt(maxColor - minColor);25         // 獲得藍色的隨機顏色值26         int blue = minColor + random.nextInt(maxColor - minColor);27         return new Color(red, green, blue);28     }29  30     protected static void getValidationCode() throws IOException {31         try {32             // 獲得驗證碼集合的長度33             int charsLength = codeChars.length();34             // 設定圖形驗證碼的長和寬（圖形的大小）35             int width = 90, height = 30;36             BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);37             Graphics g = image.getGraphics();// 獲得用於輸出文字的Graphics對象38             Random random = new Random();39             g.setColor(getRandomColor(180, 250));// 隨機設定要填充的顏色40             g.fillRect(0, 0, width, height);// 填充圖形背景41             // 設定初始字型42             g.setFont(new Font("Times New Roman", Font.ITALIC, height));43             g.setColor(getRandomColor(120, 180));// 隨機設定字型顏色44             // 用於儲存最後隨機產生的驗證碼45             StringBuilder validationCode = new StringBuilder();46             // 驗證碼的隨機字型47             String[] fontNames = { "Times New Roman", "Book antiqua", "Arial" };48             // 隨機產生3個到5個驗證碼49             for (int i = 0; i < 3 + random.nextInt(3); i++) {50                 // 隨機設定當前驗證碼的字元的字型51                 g.setFont(new Font(fontNames[random.nextInt(3)], Font.ITALIC, height));52                 // 隨機獲得當前驗證碼的字元53                 char codeChar = codeChars.charAt(random.nextInt(charsLength));54                 validationCode.append(codeChar);55                 // 隨機設定當前驗證碼字元的顏色56                 g.setColor(getRandomColor(10, 100));57                 // 在圖形上輸出驗證碼字元，x和y都是隨機產生的58                 g.drawString(String.valueOf(codeChar), 16 * i + random.nextInt(7), height - random.nextInt(6));59             }60             File file = new File("d:\\code.png");  61             ImageIO.write(image, "png", file);  62             System.out.println(validationCode.toString());63             //byte[] data = ((DataBufferByte) image.getData().getDataBuffer()).getData();64             g.dispose();65         } catch (Exception e) {66             e.printStackTrace();  67         }68     }69  70     public static void main(String[] args) throws IOException{71         getValidationCode();72     }73 }

 

Java產生驗證碼