8月29日17:52:34
public class CodeUtil {private static int width = 90;// 定义图片的widthprivate static int height = 15;// 定义图片的heightprivate static int codeCount = 6;// 定义图片上显示验证码的个数private static int xx = 15;private static int fontHeight = 18;private static int codeY = 16;private static char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R','S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };/*** 生成一个map集合* code为生成的验证码* codePic为生成的验证码BufferedImage对象* @return*/public static Map<String,Object> generateCodeAndPic() {// 定义图像bufferBufferedImage buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);// Graphics2D gd = buffImg.createGraphics();// Graphics2D gd = (Graphics2D) buffImg.getGraphics();Graphics gd = buffImg.getGraphics();// 创建一个随机数生成器类Random random = new Random();// 将图像填充为白色gd.setColor(Color.WHITE);gd.fillRect(0, 0, width, height);// 创建字体，字体的大小应该根据图片的高度来定。Font font = new Font("Fixedsys", Font.BOLD, fontHeight);// 设置字体。gd.setFont(font);// 画边框。gd.setColor(Color.BLACK);gd.drawRect(0, 0, width - 1, height - 1);// 随机产生40条干扰线，使图象中的认证码不易被其它程序探测到。gd.setColor(Color.BLACK);for (int i = 0; i < 30; i++) {int x = random.nextInt(width);int y = random.nextInt(height);int xl = random.nextInt(12);int yl = random.nextInt(12);gd.drawLine(x, y, x + xl, y + yl);}// randomCode用于保存随机产生的验证码，以便用户登录后进行验证。StringBuffer randomCode = new StringBuffer();int red = 0, green = 0, blue = 0;// 随机产生codeCount数字的验证码。for (int i = 0; i < codeCount; i++) {// 得到随机产生的验证码数字。String code = String.valueOf(codeSequence[random.nextInt(36)]);// 产生随机的颜色分量来构造颜色值，这样输出的每位数字的颜色值都将不同。red = random.nextInt(255);green = random.nextInt(255);blue = random.nextInt(255);// 用随机产生的颜色将验证码绘制到图像中。gd.setColor(new Color(red, green, blue));gd.drawString(code, (i + 1) * xx, codeY);// 将产生的四个随机数组合在一起。randomCode.append(code);}Map<String,Object> map =new HashMap<String,Object>();//存放验证码map.put("codes", randomCode);//存放生成的验证码BufferedImage对象map.put("codePics", buffImg);return map;}
// 生成验证码@RequestMapping(value = "/securityCode", method = RequestMethod.GET)public void securityCode(HttpServletRequest req, HttpServletResponse resp,HttpSession httpsession) {Map<String, Object> map = CodeUtil.generateCodeAndPic();httpsession.setAttribute("thiscode", map.get("code"));System.out.println("验证码的值为：" + map.get("code"));resp.setContentType("image/png");// 必须设置响应内容类型为图片，否则前台不识别try {OutputStream os = resp.getOutputStream(); // 获取文件输出流ImageIO.write((RenderedImage) map.get("codePic"), "jpeg", os);os.flush(); os.close();}catch(IOException e) {logger.error("生成验证码异常：{}",e.getMessage());}}
访问方法生成验证码
<div class="col-md-9"><div class="row" ><div class="col-md-6"><input type="text" placeholder="请输入验证码" name = "code" maxlength="4" class="input-val"></div><div class="col-md-6"><!-- <span class="yzxx" style="margin-left: 20px; color:#a94442; font-size: 12px;"></span> --><span><img alt="" id="thiscode" src="<%=path%>/jyxtLoginController/securityCode"></span></div></div></div>
//js代码$("#thiscode").click(function(){var src = " <%=path%>/jyxtLoginController/securityCode?"+new Date().getTime(); $('#thiscode').attr("src",src)})
