java生成验证码图片

public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {BufferedImage image = new BufferedImage(100, 100,BufferedImage.TYPE_INT_RGB);Graphics g = image.getGraphics();// 1.设置背景色 setBackGround(g);// 2.设置边框 setBorder(g);// 3.画干扰线 drawRandomLine(g);// 4.写随机数 drawRandomNum(g);// 5.图形写给浏览器response.setContentType("image/jpeg");ImageIO.write(image, "jpg", response.getOutputStream());}private void drawRandomNum(Graphics g) {g.setColor(Color.RED);g.setFont(new Font("宋体",Font.BOLD,20));//所有汉字区间 \u4e00 \u9fa5for (int i = 0; i < 4; i++) {int r=new Random().nextInt(100);int r2=new Random().nextInt(100);g.drawString("好", r, r2);}}private void drawRandomLine(Graphics g) {g.setColor(Color.GREEN);for (int i = 0; i < 5; i++) {int x1 = new Random().nextInt(100);int y1 = new Random().nextInt(100);int x2 = new Random().nextInt(100);int y2 = new Random().nextInt(100);g.drawLine(x1, y1, x2, y2);}}private void setBorder(Graphics g) {g.setColor(Color.BLUE);g.drawRect(1, 1, 98, 98);}private void setBackGround(Graphics g) {g.setColor(Color.WHITE);g.fillRect(0, 0, 100, 100);}