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< 20; i++) { Point p1 = new Point(rand.nextInt(200), rand.nextInt(30)); Point p2 = new Point(rand.nextInt(200), rand.nextInt(30)); g.drawLine(p1.x, p1.y, p2.x, p2.y); } g.setColor(Color.RED); g.setFont(new Font("楷体", Font.BOLD, 22)); int plan = 2; switch (rand.nextInt(plan)) { case 0: plan(g); break; case 1: plan1(g); break; default: break; } answer.setBufferedImage(bufferedImage); answer.setResult(result); g.dispose(); return answer; } // 方案一 private static void plan(Graphics g) { words = ReadTxt.read("/res/words.txt"); // 指定生成验证码问题的资源文件的路径 Random rand = new Random(); String first = String.valueOf(words.charAt(rand.nextInt(words.length()))); String second = String.valueOf(words.charAt(rand.nextInt(words.length()))); String third = String.valueOf(words.charAt(rand.nextInt(words.length()))); g.drawString(first, rand.nextInt(40) + 20, rand.nextInt(12) + 15); g.drawString(second, rand.nextInt(40) + 80, rand.nextInt(12) + 15); g.drawString(third, rand.nextInt(40) + 140, rand.nextInt(12) + 15); result = first + second + third; } // 方案二 private static void plan1(Graphics g) { words2 = ReadTxt.read("/res/words2.txt"); // 指定生成验证码问题的资源文件的路径 Random rand = new Random(); String first = String.valueOf(words2.charAt(rand.nextInt(words2.length() - 2))); String second = String.valueOf(words2.charAt(rand.nextInt(2) + 9)); String third = String.valueOf(words2.charAt(rand.nextInt(words2.length() - 2))); g.drawString(first, rand.nextInt(30) + 20, rand.nextInt(12) + 15); g.drawString(second, rand.nextInt(40) + 60, rand.nextInt(12) + 15); g.drawString(third, rand.nextInt(30) + 110, rand.nextInt(12) + 15); g.drawString("=", rand.nextInt(40) + 150, rand.nextInt(12) + 15); if(second.equals("+")) { result = String.valueOf(Integer.valueOf(first) + Integer.valueOf(third)); }else{ result = String.valueOf(Integer.valueOf(first) - Integer.valueOf(third)); } }} 读取生成验证码所需文件类 package ccnu.util;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;// 专门用于读取文件public class ReadTxt{ public static String read(String path) // 根据指定路径path来读取它，并返回它所包含的内容 { StringBuffer sb = new StringBuffer(); try { BufferedReader br = new BufferedReader(new InputStreamReader(Verification.class.getResourceAsStream(path))); String temp = null; while(null != (temp = br.readLine())) { sb.append(temp); } br.close(); } catch (IOException e) { e.printStackTrace(); } return sb.toString(); }} 得到生成的验证码所包含的信息类(图案、问题) package ccnu.util;import java.awt.image.BufferedImage;// 用于将生成的验证码的图案信息以及问题结果封装public class Answer{ private BufferedImage bufferedImage = null; // 验证码图像 private String result = null; // 验证码图像问题的答案 public BufferedImage getBufferedImage() { return bufferedImage; } public void setBufferedImage(BufferedImage bufferedImage) { this.bufferedImage = bufferedImage; } public String getResult() { return result; } public void setResult(String result) { this.result = result; }} 验证码生成汉字识别的问题的文件words.txt 如： 中国湖北省武汉市汉东大学政法学院 验证码生成算术运算的问题的文件words2.txt 123456789+- 提示图片

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