做个记录，供大家参考和自己以后学习学习，直接上代码
验证码部分
jsp部分
<div class="loginbody"> <div class="login-container"> <div class="center"> <img src="images/logo_login.png" /> </div> <div class="space-6"></div> <div class="position-relative"> <div id="login-box" class="login-box widget-box no-border visible"> <div class="widget-body"> <div class="widget-main"> <h4 class="header blue lighter bigger"> <i class="icon-coffee green"></i> 管理员登录 </h4> <div class="login_icon"><img src="images/login.png" /></div> <form class="login" id="login" action="admin/login" method="post"> <fieldset> <ul> <li class="frame_style form_error"><label class="user_icon"></label><input name="name" value="${name}" type="text" id="name" /><i>用户名</i></li> <li class="frame_style form_error"><label class="password_icon"></label><input name="password" value="${password}" type="password" id="pwd"/><i>密码</i></li> <li class="frame_style form_error"><label class="Codes_icon"></label> <input name="code" type="text" id="Codes_text" class="auautocomplete=off"/><i>验证码</i><div class="Codes_region"><img src="images/yzm.jpg" style="width:80;height:35" id ="checkCode_img"/></div></li> <li><i><font color='red'>${error}</font></i></li> </ul> <div class="space"></div> <div class="clearfix"> <label class="inline"> <input type="checkbox" class="ace"> <span class="lbl">保存密码</span> </label> <button type="button" class="width-35 pull-right btn btn-sm btn-primary" id="login_btn"> <i class="icon-key"></i> 登录 </button> </div> <div class="space-4"></div> </fieldset> </form>
js代码
var getCodeUrl="/changeCode";//获取验证码的后端地址 $('#checkCode_img').attr('src',getCodeUrl+'?t='+ new Date().getTime()).show();//为了防止浏览器缓存上次的验证码 $('#checkCode_img').click(function(){this.src=getCodeUrl+'?t='+ new Date().getTime();});
Java代码
生成验证码工具类（此部分借用网上的代码，这位仁兄谢谢你了，当时博客链接没保存，不好意思啦，再次感谢）
public class GenConfirmCodeUtil { public static final String RANDOMCODEKEY= "RANDOMCODEKEY";//放到session中的key private String randString = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生数字与字母组合的字符串 private int width = 80;// 图片宽 private int height = 35;// 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 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); g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 20)); g.setColor(getRandColor(110, 133)); // 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); } //将生成的随机字符串保存到session中，而jsp界面通过session.getAttribute("RANDOMCODEKEY")， //获得生成的验证码，然后跟用户输入的进行比较 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) { e.printStackTrace(); } } /* * 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)); } }
Controller代码
@Controller public class ConfirmCodeController { @RequestMapping(value = "/changeCode") public void getVerify(HttpServletRequest request, HttpServletResponse response){ 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); GenConfirmCodeUtil codeUtil=new GenConfirmCodeUtil(); try { codeUtil.getRandcode(request, response);//输出验证码图片方法 } catch (Exception e) { e.printStackTrace(); } } }
登录的代码
ServiceImpl
@Service public class LoginServiceImpl implements LoginService { @Autowired private TbAdminMapper adminMapper; @Override public TbAdmin login(String name) { TbAdminExample example=new TbAdminExample(); Criteria criteria = example.createCriteria(); criteria.andNameEqualTo(name); List<TbAdmin> admin = adminMapper.selectByExample(example); if(admin.size()>0&&admin!=null) { return admin.get(0); } return null; } }
Controller
public class LoginController { @Autowired private LoginService loginService; @RequestMapping(value="/login",method=RequestMethod.POST) public String login(String name,String password,String code,HttpSession session) { //获取验证码 String codeStr = (String) session.getAttribute("RANDOMCODEKEY"); TbAdmin admin = loginService.login(name); try { if(code.equalsIgnoreCase(codeStr)) { if(admin!=null) { if(password.equals(admin.getPassword())) { session.setAttribute("admin", admin); return "index"; } } }else { session.setAttribute("error","验证码错误"); return "redirect:/login.jsp"; } }catch(Exception e) { e.printStackTrace(); session.setAttribute("error", "账号或密码错误"); return "redirect:/login.jsp"; } return null; }
