@WebServlet("/CheckCodeServlet")
public class CheckCodeServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private List<String> words = new ArrayList<String>();
@Override
public void init() throws ServletException {
String path = getServletContext().getRealPath("/WEB-INF/words.txt");
try {
BufferedReader reader = new BufferedReader(new FileReader(path));
String line;
while ((line = reader.readLine()) != null) {
words.add(line);
}
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
int width = 120;
int height = 30;
BufferedImage bufferedImage = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics graphics = bufferedImage.getGraphics();
graphics.setColor(getRandColor(200, 250));
graphics.fillRect(0, 0, width, height);
graphics.setColor(Color.WHITE);
graphics.drawRect(0, 0, width - 1, height - 1);
Graphics2D graphics2d = (Graphics2D) graphics;
graphics2d.setFont(new Font("宋体", Font.BOLD, 18));
Random random = new Random();
int index = random.nextInt(words.size());
String word = words.get(index);
int x = 10;
for (int i = 0; i < word.length(); i++) {
graphics2d.setColor(new Color(20 + random.nextInt(110), 20 + random
.nextInt(110), 20 + random.nextInt(110)));
int jiaodu = random.nextInt(60) - 30;
double theta = jiaodu * Math.PI / 180;
char c = word.charAt(i);
graphics2d.rotate(theta, x, 20);
graphics2d.drawString(String.valueOf(c), x, 20);
graphics2d.rotate(-theta, x, 20);
x += 30;
}
request.getSession().setAttribute("checkcode_session", word);
this.getServletContext().setAttribute("checkCode", word);
graphics.setColor(getRandColor(160, 200));
int x1;
int x2;
int y1;
int y2;
for (int i = 0; i < 30; i++) {
x1 = random.nextInt(width);
x2 = random.nextInt(12);
y1 = random.nextInt(height);
y2 = random.nextInt(12);
graphics.drawLine(x1, y1, x1 + x2, x2 + y2);
}
graphics.dispose();
ImageIO.write(bufferedImage, "jpg", response.getOutputStream());
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
private Color getRandColor(int fc, int bc) {
Random random = new Random();
if (fc > 255) {
fc = 255;
}
if (bc > 255) {
bc = 255;
}
int r = fc + random.nextInt(bc - fc);
int g = fc + random.nextInt(bc - fc);
int b = fc + random.nextInt(bc - fc);
return new Color(r, g, b);
}
}
