springboot登陆页面图片验证码简单的web项目实现
写在前面
前段时间大家都说最近大环境不好,好多公司在裁员,换工作的话不推荐轻易的裸辞,但是我想说的是我所在的公司好流弊,有做不完的业务需求,还有就是招不完的人......
最近我也是比较繁忙,但是还是要抽一点时间来进行自我复盘和记录,最近也写一个简单的小功能,就是登陆界面的图片验证码功能
环境:Tomcat9、Jdk1.8
1 生成验证码的工具类
public class RandomValidateCodeUtil { public static final String RANDOMCODEKEY= "RANDOMVALIDATECODEKEY";//放到session中的key private String randString = "0123456789";//随机产生只有数字的字符串 private String //private String randString = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生只有字母的字符串 //private String randString = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生数字与字母组合的字符串 private int width = 95;// 图片宽 private int height = 25;// 图片高 private int lineSize = 40;// 干扰线数量 private int stringNum = 4;// 随机产生字符数量 private static final Logger logger = LoggerFactory.getLogger(RandomValidateCodeUtil.class); private Random random = new Random(); /** * 获得字体 */ private Font getFont() { return new Font("Fixedsys", Font.CENTER_BASELINE, 18); } /** * 获得颜色 */ private Color getRandColor(int fc, int bc) { if (fc > 255) fc = 255; if (bc > 255) bc = 255; int r = fc + random.nextInt(bc - fc - 16); int g = fc + random.nextInt(bc - fc - 14); int b = fc + random.nextInt(bc - fc - 18); return new Color(r, g, b); } /** * 生成随机图片 */ public void getRandcode(HttpServletRequest request, HttpServletResponse response) { HttpSession session = request.getSession(); // BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR); Graphics g = image.getGraphics();// 产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作 g.fillRect(0, 0, width, height);//图片大小 g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));//字体大小 g.setColor(getRandColor(110, 133));//字体颜色 // 绘制干扰线 for (int i = 0; i <= lineSize; i++) { drowLine(g); } // 绘制随机字符 String randomString = ""; for (int i = 1; i <= stringNum; i++) { randomString = drowString(g, randomString, i); } logger.info(randomString); //将生成的随机字符串保存到session中 session.removeAttribute(RANDOMCODEKEY); session.setAttribute(RANDOMCODEKEY, randomString); g.dispose(); try { // 将内存中的图片通过流动形式输出到客户端 ImageIO.write(image, "JPEG", response.getOutputStream()); } catch (Exception e) { logger.error("将内存中的图片通过流动形式输出到客户端失败>>>> ", e); } } /** * 绘制字符串 */ private String drowString(Graphics g, String randomString, int i) { g.setFont(getFont()); g.setColor(new Color(random.nextInt(101), random.nextInt(111), random .nextInt(121))); String rand = String.valueOf(getRandomString(random.nextInt(randString .length()))); randomString += rand; g.translate(random.nextInt(3), random.nextInt(3)); g.drawString(rand, 13 * i, 16); return randomString; } /** * 绘制干扰线 */ private void drowLine(Graphics g) { int x = random.nextInt(width); int y = random.nextInt(height); int xl = random.nextInt(13); int yl = random.nextInt(15); g.drawLine(x, y, x + xl, y + yl); } /** * 获取随机的字符 */ public String getRandomString(int num) { return String.valueOf(randString.charAt(num)); } }
这个类不用动,可以直接拿来用
2 页面代码
<!--html/bady代码--> <div > <div > <div > <input type="tel" id="verify_input" placeholder="请输入验证码" maxlength="4"> </div> </div> <div > <a href="javascript:void(0);" rel="external nofollow" title="点击更换验证码"> <img id="imgVerify" src="login/getVerify" alt="更换验证码" height="36" width="170" onclick="getVerify(this);"> </a> </div> <input type="button" onclick="aVerify()" value="提交"> </div> </body> <!--js中的代码--> <script type="text/javascript" src="./js/jquery.min.js"></script> <script> //获取验证码 /*function getVerify(obj){ obj.src = "login/getVerify?"+Math.random();//原生js方式 }*/ //获取验证码 function getVerify() { // $("#imgCode").on("click", function() { $("#imgVerify").attr("src", 'login/getVerify?' + Math.random());//jquery方式 // }); } function aVerify(){ var value =$("#verify_input").val(); // alert(value); $.ajax({ async: false, type: 'post', url: 'login/checkVerify', dataType: "json", data: { verifyInput: value }, success: function (result) { if (result) { alert("success!"); } else { alert("failed!"); } // window.location.reload(); getVerify(); } }); } </script>
注意:这里有2种获取验证码图片的方法
3 获取code和验证code的类
@RestController @RequestMapping("/login") public class Picverifyaction { private final static Logger logger = LoggerFactory.getLogger(Picverifyaction.class); /** * 生成验证码 */ @RequestMapping(value = "/getVerify") public void getVerify(HttpServletRequest request, HttpServletResponse response) { try { response.setContentType("image/jpeg");//设置相应类型,告诉浏览器输出的内容为图片 response.setHeader("Pragma", "No-cache");//设置响应头信息,告诉浏览器不要缓存此内容 response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expire", 0); RandomValidateCodeUtil randomValidateCode = new RandomValidateCodeUtil(); randomValidateCode.getRandcode(request, response);//输出验证码图片方法 } catch (Exception e) { logger.error("获取验证码失败>>>> ", e); } } /** * 校验验证码 */ @RequestMapping(value = "/checkVerify", method = RequestMethod.POST,headers = "Accept=application/json") public boolean checkVerify(@RequestParam String verifyInput, HttpSession session) { try{ //从session中获取随机数 String inputStr = verifyInput; String random = (String) session.getAttribute("RANDOMVALIDATECODEKEY"); if (random == null) { return false; } if (random.equals(inputStr)) { return true; } else { return false; } }catch (Exception e){ logger.error("验证码校验失败", e); return false; } } }
4 效果图镇楼
5 源码
当然上面代码只是核心部分,如果有问题可去github自行下载 charmsongo
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持我们。
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