@RequestMapping(value = "/img")
public void makeImage(HttpServletRequest request, HttpServletResponse response)
throws IOException
{
int charNum = 4 ;
int width = 20 * 3;
int height = 28;
//1.創建一張內存圖片
BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
//2.獲得繪圖對象
Graphics graphics = bufferedImage.getGraphics();
//3.繪製背景顏色
graphics.setColor(Color.WHITE);
//graphics.fillRect(0,0,width,height);
graphics.fill3DRect(0,0,width,height,true);
//4.繪製圖片邊框
graphics.setColor(Color.GRAY);
graphics.drawRect(0,0,width-2,height-2);
//5.輸出驗證碼內容
graphics.setColor(Color.RED);
graphics.setFont(new Font("宋體",Font.BOLD,20));
//6.隨機輸出4個字符
String s = "ABCDEFGHGKLMNPQRSTUVWXYZ23456789";
Random random = new Random();
// session中要用到
String msg = "";
int x = 5;
for (int i = 0; i < charNum; i++) {
int index = random.nextInt(32);
String content = String.valueOf(s.charAt(index));
msg += content;
graphics.setColor(new Color(random.nextInt(255), random.nextInt(255), random.nextInt(255)));
graphics.drawString(content, x, 22);
x += 20;
}
// 6、繪製干擾線
graphics.setColor(Color.GRAY);
for (int i = 0; i < 5; i++) {
int x1 = random.nextInt(width);
int x2 = random.nextInt(width);
int y1 = random.nextInt(height);
int y2 = random.nextInt(height);
graphics.drawLine(x1, y1, x2, y2);
}
// 釋放資源
graphics.dispose();
// 圖片輸出 ImageIO
ImageIO.write(bufferedImage, "jpg", response.getOutputStream());
}