滑動驗證碼的設(shè)計與理解

 /**
 * 驗證碼的父類，所有驗證碼都要繼承這個類
 * @param id 驗證碼的唯一標識
 * @param type 驗證碼的類型
 * @param contentDiv 包含著驗證碼的DIV
 * @constructor
 */
 var Identifying = function (id,type,contentDiv){
  this.id = id;
  this.type = type;
  this.contentDiv=contentDiv;
 }
 /**
 * 銷毀函數(shù)
 */
 Identifying.prototype.destroy = function(){
  this.successFunc = null;
  this.errorFunc = null;
  this.clearDom();
  this.contentDiv = null;
 }
 /**
 * 清除節(jié)點內(nèi)容
 */
 Identifying.prototype.clearDom = function(){
  if(this.contentDiv instanceof jQuery){
   this.contentDiv.empty();
  }else if(this.contentDiv instanceof HTMLElement){
   this.contentDiv.innerText = "";
  }
 }
 /**
 * 回調(diào)函數(shù)
 * 驗證成功后進行調(diào)用
 * this需要指具體驗證類
 * @param result 對象，有對應(yīng)驗證類的傳遞的參數(shù)，具體要看驗證類
 */
 Identifying.prototype.success = function (result) {
  if(this.successFunc instanceof Function){
   this.successFunc(result);
  }
 }
 /**
 * 驗證失敗發(fā)生錯誤調(diào)用的函數(shù)
 * @param result
 */
 Identifying.prototype.error = function (result) {
  if(this.errorFunc instanceof Function){
   this.errorFunc(result);
  }else{
   //統(tǒng)一處理錯誤
  }
 }
 /**
 * 獲取驗證碼id
 */
 Identifying.prototype.getId = function () {
  return this.id;
 }
 /**
 * 獲取驗證碼類型
 * @returns {*}
 */
 Identifying.prototype.getType = function () {
  return this.type;
 }
 /**
 * 顯示驗證框
 */
 Identifying.prototype.showIdentifying = function(callback){
  this.contentDiv.show(null,callback);
 }
 /**
 * 隱藏驗證框
 */
 Identifying.prototype.hiddenIdentifying = function(callback){
  this.contentDiv.hide(null,callback);
 }
 /**
 * 獲得驗證碼顯示的dom元素
 */
 Identifying.prototype.getContentDiv = function () {
  return this.contentDiv;
 }

 /**
 * 滑動驗證類
 * complete傳遞的參數(shù)為identifyingId，identifyingType，moveEnd_X
 * @param config 各種配置
 */
 var ImgIdentifying = function(config) {
  Identifying.call(this, config.identifyingId, config.identifyingType,config.el);
  this.config = config;
  this.init();
  this.showIdentifying();
 }
 //繼承父類
 extendClass(Identifying, ImgIdentifying);
 /**
 * 銷毀函數(shù)
 */
 ImgIdentifying.prototype.destroy = function () {
  Identifying.prototype.destroy.call(this);
 }
 var width = '260';
 var height = '116';
 var pl_size = 48;
 var padding_ = 20;
 ImgIdentifying.prototype.init = function () {
  this.clearDom();
  var el = this.getContentDiv();
  var w = width;
  var h = height;
  var PL_Size = pl_size;
  var padding = padding_;
  var self = this;
  //這個要轉(zhuǎn)移到后臺
  function RandomNum(Min, Max) {
   var Range = Max - Min;
   var Rand = Math.random();
   if (Math.round(Rand * Range) == 0) {
    return Min + 1;
   } else if (Math.round(Rand * Max) == Max) {
    return Max - 1;
   } else {
    var num = Min + Math.round(Rand * Range) - 1;
    return num;
   }
  }
  //確定圖片
  var imgSrc = this.config.img;
  var X = this.config.X;
  var Y = this.config.Y;
  var left_Num = -X + 10;
  var html = 'div style="position:relative;padding:16px 16px 28px;border:1px solid #ddd;background:#f2ece1;border-radius:16px;">';
  html += 'div style="position:relative;overflow:hidden;width:' + w + 'px;">';
  html += 'div style="position:relative;width:' + w + 'px;height:' + h + 'px;">';
  html += 'img id="scream" src="' + imgSrc + '" style="width:' + w + 'px;height:' + h + 'px;">';
  html += 'canvas id="puzzleBox" width="' + w + '" height="' + h + '" style="position:absolute;left:0;top:0;z-index:222;">/canvas>';
  html += '/div>';
  html += 'div class="puzzle-lost-box" style="position:absolute;width:' + w + 'px;height:' + h + 'px;top:0;left:' + left_Num + 'px;z-index:11111;">';
  html += 'canvas id="puzzleShadow" width="' + w + '" height="' + h + '" style="position:absolute;left:0;top:0;z-index:222;">/canvas>';
  html += 'canvas id="puzzleLost" width="' + w + '" height="' + h + '" style="position:absolute;left:0;top:0;z-index:333;">/canvas>';
  html += '/div>';
  html += 'p class="ver-tips">/p>';
  html += '/div>';
  html += 'div class="re-btn">a>/a>/div>';
  html += '/div>';
  html += 'br>';
  html += 'div style="position:relative;width:' + w + 'px;margin:auto;">';
  html += 'div style="border:1px solid #c3c3c3;border-radius:24px;background:#ece4dd;box-shadow:0 1px 1px rgba(12,10,10,0.2) inset;">';//inset 為內(nèi)陰影
  html += 'p style="font-size:12px;color: #486c80;line-height:28px;margin:0;text-align:right;padding-right:22px;">按住左邊滑塊，拖動完成上方拼圖/p>';
  html += '/div>';
  html += 'div class="slider-btn">/div>';
  html += '/div>';
  el.html(html);
  var d = PL_Size / 3;
  var c = document.getElementById("puzzleBox");
  //getContext獲取該dom節(jié)點的canvas畫布元素
  //---------------------------------這一塊是圖片中央缺失的那一塊--------------------------------------
  var ctx = c.getContext("2d");
  ctx.globalCompositeOperation = "xor";
  //設(shè)置陰影模糊級別
  ctx.shadowBlur = 10;
  //設(shè)置陰影的顏色
  ctx.shadowColor = "#fff";
  //設(shè)置陰影距離的水平距離
  ctx.shadowOffsetX = 3;
  //設(shè)置陰影距離的垂直距離
  ctx.shadowOffsetY = 3;
  //rgba第四個參數(shù)是透明度，前三個是三原色，跟rgb比就是多了第四個參數(shù)
  ctx.fillStyle = "rgba(0,0,0,0.8)";
  //beginPath() 方法開始一條路徑，或重置當(dāng)前的路徑。
  //提示：請使用這些方法來創(chuàng)建路徑：moveTo()、lineTo()、quadricCurveTo()、bezierCurveTo()、arcTo() 以及 arc()。
  ctx.beginPath();
  //指線條的寬度
  ctx.lineWidth = "1";
  //strokeStyle 屬性設(shè)置或返回用于筆觸的顏色、漸變或模式
  ctx.strokeStyle = "rgba(0,0,0,0)";
  //表示畫筆移到(X,Y)位置，沒畫東西
  ctx.moveTo(X, Y);
  //畫筆才開始移動到指定坐標，之間畫一條直線
  ctx.lineTo(X + d, Y);
  //繪制一條貝塞爾曲線，一共四個點確定，開始點(沒在參數(shù)里)，和兩個控制點(1和2參數(shù)結(jié)合,3和4參數(shù)結(jié)合)，結(jié)束點(5和6參數(shù)結(jié)合)
  ctx.bezierCurveTo(X + d, Y - d, X + 2 * d, Y - d, X + 2 * d, Y);
  ctx.lineTo(X + 3 * d, Y);
  ctx.lineTo(X + 3 * d, Y + d);
  ctx.bezierCurveTo(X + 2 * d, Y + d, X + 2 * d, Y + 2 * d, X + 3 * d, Y + 2 * d);
  ctx.lineTo(X + 3 * d, Y + 3 * d);
  ctx.lineTo(X, Y + 3 * d);
  //必須和beginPath()成對出現(xiàn)
  ctx.closePath();
  //進行繪制
  ctx.stroke();
  //根據(jù)fillStyle進行填充
  ctx.fill();
  //---------------------------------這個為要移動的塊------------------------------------------------
  var c_l = document.getElementById("puzzleLost");
  //---------------------------------這個為要移動的塊增加陰影------------------------------------------------
  var c_s = document.getElementById("puzzleShadow");
  var ctx_l = c_l.getContext("2d");
  var ctx_s = c_s.getContext("2d");
  var img = new Image();
  img.src = imgSrc;
  img.onload = function () {
   //從原圖片，進行設(shè)置處理再顯示出來(其實就是設(shè)置你想顯示圖片的位置2和3參數(shù)，和框w高h)
   ctx_l.drawImage(img, 0, 0, w, h);
  }
  ctx_l.beginPath();
  ctx_l.strokeStyle = "rgba(0,0,0,0)";
  ctx_l.moveTo(X, Y);
  ctx_l.lineTo(X + d, Y);
  ctx_l.bezierCurveTo(X + d, Y - d, X + 2 * d, Y - d, X + 2 * d, Y);
  ctx_l.lineTo(X + 3 * d, Y);
  ctx_l.lineTo(X + 3 * d, Y + d);
  ctx_l.bezierCurveTo(X + 2 * d, Y + d, X + 2 * d, Y + 2 * d, X + 3 * d, Y + 2 * d);
  ctx_l.lineTo(X + 3 * d, Y + 3 * d);
  ctx_l.lineTo(X, Y + 3 * d);
  ctx_l.closePath();
  ctx_l.stroke();
  //帶陰影，數(shù)字越高陰影越嚴重
  ctx_l.shadowBlur = 10;
  //陰影的顏色
  ctx_l.shadowColor = "black";
  // ctx_l.fill(); 其實加這句就能有陰影效果了，不知道為什么加多個圖層
  //分割畫布的塊
  ctx_l.clip();
  ctx_s.beginPath();
  ctx_s.lineWidth = "1";
  ctx_s.strokeStyle = "rgba(0,0,0,0)";
  ctx_s.moveTo(X, Y);
  ctx_s.lineTo(X + d, Y);
  ctx_s.bezierCurveTo(X + d, Y - d, X + 2 * d, Y - d, X + 2 * d, Y);
  ctx_s.lineTo(X + 3 * d, Y);
  ctx_s.lineTo(X + 3 * d, Y + d);
  ctx_s.bezierCurveTo(X + 2 * d, Y + d, X + 2 * d, Y + 2 * d, X + 3 * d, Y + 2 * d);
  ctx_s.lineTo(X + 3 * d, Y + 3 * d);
  ctx_s.lineTo(X, Y + 3 * d);
  ctx_s.closePath();
  ctx_s.stroke();
  ctx_s.shadowBlur = 20;
  ctx_s.shadowColor = "black";
  ctx_s.fill();
  //開始時間
  var beginTime;
  //結(jié)束時間
  var endTime;
  var moveStart = '';
  $(".slider-btn").mousedown(function (e) {
   $(this).css({"background-position": "0 -216px"});
   moveStart = e.pageX;
   beginTime = new Date().valueOf();
  });
  onmousemove = function (e) {
   var e = e || window.event;
   var moveX = e.pageX;
   var d = moveX - moveStart;
   if (moveStart == '') {
   } else {
    if (d  0 || d > (w - padding - PL_Size)) {
    } else {
     $(".slider-btn").css({"left": d + 'px', "transition": "inherit"});
     $("#puzzleLost").css({"left": d + 'px', "transition": "inherit"});
     $("#puzzleShadow").css({"left": d + 'px', "transition": "inherit"});
    }
   }
  };
  onmouseup = function (e) {
   var e = e || window.event;
   var moveEnd_X = e.pageX - moveStart;
   var ver_Num = X - 10;
   var deviation = self.config.deviation;
   var Min_left = ver_Num - deviation;
   var Max_left = ver_Num + deviation;
   if (moveStart == '') {
   } else {
    endTime = new Date().valueOf();
    if (Max_left > moveEnd_X  moveEnd_X > Min_left) {
     $(".ver-tips").html('i style="background-position:-4px -1207px;">/i>span style="color:#42ca6b;">驗證通過/span>span>/span>');
     $(".ver-tips").addClass("slider-tips");
     $(".puzzle-lost-box").addClass("hidden");
     $("#puzzleBox").addClass("hidden");
     setTimeout(function () {
      $(".ver-tips").removeClass("slider-tips");
     }, 2000);
     self.success({
      'identifyingId': self.config.identifyingId, 'identifyingType': self.config.identifyingType,
      'moveEnd_X': moveEnd_X
     })
    } else {
     $(".ver-tips").html('i style="background-position:-4px -1229px;">/i>span style="color:red;">驗證失敗:/span>span style="margin-left:4px;">拖動滑塊將懸浮圖像正確拼合/span>');
     $(".ver-tips").addClass("slider-tips");
     setTimeout(function () {
      $(".ver-tips").removeClass("slider-tips");
     }, 2000);
     self.error();
    }
   }
   //0.5指動畫執(zhí)行到結(jié)束一共經(jīng)歷的時間
   setTimeout(function () {
    $(".slider-btn").css({"left": '0', "transition": "left 0.5s"});
    $("#puzzleLost").css({"left": '0', "transition": "left 0.5s"});
    $("#puzzleShadow").css({"left": '0', "transition": "left 0.5s"});
   }, 1000);
   $(".slider-btn").css({"background-position": "0 -84px"});
   moveStart = '';
   $(".re-btn a").on("click", function () {
    Access.getAccess().initIdentifying($('#acessIdentifyingContent'));
   })
  }
 }
 /**
 * 獲取該類型驗證碼的一些參數(shù)
 */
 ImgIdentifying.getParamMap = function () {
  var min_X = padding_ + pl_size;
  var max_X = width - padding_ - pl_size - pl_size / 6;
  var max_Y = padding_;
  var min_Y = height - padding_ - pl_size - pl_size / 6;
  var paramMap = new Map();
  paramMap.set("min_X", min_X);
  paramMap.set("max_X", max_X);
  paramMap.set("min_Y", min_Y);
  paramMap.set("max_Y", max_Y);
  return paramMap;
 }
 /**
 * 設(shè)置驗證成功的回調(diào)函數(shù)
 * @param success
 */
 ImgIdentifying.prototype.setSuccess = function (successFunc) {
  this.successFunc = successFunc;
 }
 /**
 * 設(shè)置驗證失敗的回調(diào)函數(shù)
 * @param success
 */
 ImgIdentifying.prototype.setError = function (errorFunc) {
  this.errorFunc = errorFunc;
 }

 /**
 * 驗證碼類的接口，所有驗證碼必須繼承此接口
 */
 public interface I_IdentifyingT> {
  String EXCEPTION_CODE = SystemStaticValue.IDENTIFYING_EXCEPTION_CODE;
  String IDENTIFYING = "Identifying";
  //--------------以下為驗證碼大體錯誤類型，拋出錯誤時候用，會傳至前端---------------
  //驗證成功
  String SUCCESS = "Success";
  //驗證失敗
  String FAILURE = "Failure";
  //驗證碼過期
  String OVERDUE = "Overdue";
  //-------以下為驗證碼具體錯誤類型，存放在checkResult-------------
  String PARAM_ERROR = "驗證碼參數(shù)錯誤";
  String OVERDUE_ERROR = "驗證碼過期";
  String TYPE_ERROR = "驗證碼業(yè)務(wù)類型錯誤";
  String ID_ERROR = "驗證碼id異常";
  String CHECK_ERROR = "驗證碼驗證異常";
  /**
  * 獲取生成好的驗證碼
  * @param request
  * @return
  */
  public T getInstance(HttpServletRequest request) throws Exception;
  /**
  * 進行驗證，沒拋異常說明驗證無誤
  * @return
  */
  public void checkIdentifying(HttpServletRequest request) throws Exception;
  /**
  * 獲取驗證結(jié)果，如果成功則為success，失敗則為失敗信息
  * @return
  */
  public String getCheckResult();
  /**
  * 獲取驗證碼的業(yè)務(wù)類型
  * @return
  */
  public String getIdentifyingType();
 }

 /**
 * @author NiceBin
 * @description: 驗證碼類，前端需要生成驗證碼的信息
 * @date 2019/7/12 16:04
 */
 public class ImgIdentifying implements I_IdentifyingImgIdentifying>,Serializable {
  //此次驗證碼的id
  private String identifyingId;
  //此次驗證碼的業(yè)務(wù)類型
  private String identifyingType;
  //需要使用的圖片
  private String imgSrc;
  //生成塊的x坐標
  private int X;
  //生成塊的y坐標
  private int Y;
  //允許的誤差
  private int deviation = 2;
  //驗證碼生成的時間
  private Calendar calendar;
  //驗證碼結(jié)果，如果有結(jié)果說明已經(jīng)被校驗，防止因為網(wǎng)絡(luò)延時的二次校驗
  private String checkResult;
 
  //下面是邏輯代碼...
 }

r NiceBin
 * @description: 驗證碼過濾器，幫忙驗證有需要驗證碼的請求，不幫忙生成驗證碼
 * @date 2019/7/23 15:06
 */
 @Component
 public class IdentifyingInterceptor implements HandlerInterceptor {
  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
   HttpSession session = request.getSession();
   I_Identifying identifying= (I_Identifying)session.getAttribute(I_Identifying.IDENTIFYING);
   if(identifying!=null){
    identifying.checkIdentifying(request);
   }else {
    //應(yīng)該攜帶驗證碼信息的，結(jié)果沒有攜帶，那就是個非法請求
    return false;
   }
   return true;
  }
  @Override
  public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
  }
  @Override
  public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
  }
 }