重构验证码删除文件的实现逻辑 (#479)

* 重构验证码删除文件的实现逻辑

* 移除未使用的依赖

* 微调描述信息

server/src/main/java/cn/keking/utils/CaptchaUtil.java

@@ -0,0 +1,89 @@
+package cn.keking.utils;
+
+import com.aspose.cad.Tuple;
+import org.springframework.util.ObjectUtils;
+
+import java.awt.*;
+import java.awt.image.BufferedImage;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Random;
+
+public class CaptchaUtil {
+
+    public static final String captcha_code = "captchaCode";
+    public static final String captcha_code_pic = "captchaCodePic";
+    public static final String captcha_generate_time = "captchaTime";
+
+    private static final int width = 100;// 定义图片的width
+    private static final int height = 30;// 定义图片的height
+    private static final int codeLength = 4;// 定义图片上显示验证码的个数
+    private static final int xx = 18;
+    private static final int fontHeight = 28;
+    private static final int codeY = 27;
+    private static final char[] codeSequence = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'M', 'N', 'P', 'Q', 'R', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
+            'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'm', 'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', '2', '3', '4', '5', '6', '7', '8', '9'};
+
+    /**
+     * 指定验证码、或生成验证码。
+     * @param captchaCode 指定验证码, 如果为 null，则生成验证码。否则，使用指定的验证码。
+     * @return 验证码和验证码图片
+     */
+    public static Map<String, Object> generateCaptcha(String captchaCode) {
+        // 定义图像buffer
+        BufferedImage buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
+        Graphics gd = buffImg.getGraphics();
+        Random random = new Random();
+        // 将图像填充为白色
+        gd.setColor(Color.WHITE);
+        gd.fillRect(0, 0, width, height);
+        Font font = new Font("Times New Roman", Font.BOLD, fontHeight);
+        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。
+        int red, green, blue;
+
+        if (ObjectUtils.isEmpty(captchaCode)) {
+            captchaCode = generateCaptchaCode();
+        }
+
+        // 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(captchaCode, 18, codeY);
+
+        Map<String, Object> map = new HashMap<>();
+        map.put(captcha_code, captchaCode);
+        //存放生成的验证码BufferedImage对象
+        map.put(captcha_code_pic, buffImg);
+        return map;
+    }
+
+    /**
+     * 生成随机字符串。
+     * @return 字符串
+     */
+    private static String generateCaptchaCode() {
+        Random random = new Random();
+        StringBuilder randomCode = new StringBuilder();
+        for (int i = 0; i < codeLength; i++) {
+            randomCode.append(codeSequence[random.nextInt(52)]);
+        }
+        return randomCode.toString();
+    }
+}

server/src/main/java/cn/keking/utils/DateUtils.java

@@ -0,0 +1,26 @@
+package cn.keking.utils;
+
+import java.time.Instant;
+
+/**
+ * @author kl (http://kailing.pub)
+ * @since 2023/8/11
+ */
+public class DateUtils {
+    /**
+     * 获取当前时间的秒级时间戳
+     * @return
+     */
+    public static long getCurrentSecond() {
+       return Instant.now().getEpochSecond();
+    }
+
+    /**
+     * 计算当前时间与指定时间的秒级时间戳差值
+     * @param datetime 指定时间
+     * @return 差值
+     */
+    public static long calculateCurrentTimeDifference(long datetime) {
+        return getCurrentSecond() - datetime;
+    }
+}

server/src/main/java/cn/keking/utils/RandomValidateCodeUtil.java

@@ -1,90 +0,0 @@
-package cn.keking.utils;
-
-import java.awt.*;
-import java.awt.image.BufferedImage;
-import java.util.HashMap;
-import java.util.Map;
-import java.util.Random;
-
-public class RandomValidateCodeUtil {
-
-    private static final int width = 100;// 定义图片的width
-    private static final int height = 30;// 定义图片的height
-    private static final int codeCount = 4;// 定义图片上显示验证码的个数
-    private static final int xx = 18;
-    private static final int fontHeight = 28;
-    private static final int codeY = 27;
-    private static final char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'M', 'N', 'P', 'Q', 'R','T', 'U', 'V', 'W', 'X', 'Y', 'Z',
-            'a','b','c','d','e','f','g','h','j','k','m','n','p','q','r','s','t','u','v','w','x','y', '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
-     */
-    public static Map<String,Object> generateCodeAndPic(String ip, String sessionCode, int lx) {
-        // 定义图像buffer
-        BufferedImage 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("Times New Roman", 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);
-        }
-        StringBuffer randomCode = new StringBuffer();
-        Map<String,Object> map  = new HashMap<>();
-        // randomCode用于保存随机产生的验证码，以便用户登录后进行验证。
-        int red, green, blue;
-        if (lx ==1){
-            // 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(sessionCode, 18, codeY);
-            randomCode.append(sessionCode);
-        }else {
-            // 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(52)]);
-                // 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);
-            }
-        }
-        //存放验证码
-        map.put("code", randomCode);
-        //存放生成的验证码BufferedImage对象
-        map.put("codePic", buffImg);
-        return map;
-    }
-}

server/src/main/java/cn/keking/utils/WebUtils.java

@@ -9,6 +9,8 @@ import org.springframework.web.multipart.MultipartFile;
 import org.springframework.web.util.HtmlUtils;
 
 import javax.servlet.ServletRequest;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpSession;
 import java.io.UnsupportedEncodingException;
 import java.net.MalformedURLException;
 import java.net.URL;
@@ -205,13 +207,7 @@ public class WebUtils {
         Matcher matcher = pattern.matcher(url);
         return matcher.find();
     }
-    public static boolean kuayu(String host, String wjl) {  //查询域名是否相同
-        if (wjl.contains(host)) {
-            return true;
-        }else {
-            return false;
-        }
-    }
+
     /**
      * 将 Base64 字符串解码，再解码URL参数, 默认使用 UTF-8
      * @param source 原始 Base64 字符串
@@ -265,4 +261,48 @@ public class WebUtils {
         }
         return null;
     }
+
+    /**
+     * 获取 session 中的 String 属性
+     * @param request 请求
+     * @return 属性值
+     */
+    public static String getSessionAttr(HttpServletRequest request, String key) {
+        HttpSession session = request.getSession();
+        if (session == null) {
+            return null;
+        }
+        Object value = session.getAttribute(key);
+        if (value == null) {
+            return null;
+        }
+        return value.toString();
+    }
+
+    /**
+     * 获取 session 中的 long 属性
+     * @param request 请求
+     * @param key 属性名
+     * @return 属性值
+     */
+    public static long getLongSessionAttr(HttpServletRequest request, String key) {
+        String value = getSessionAttr(request, key);
+        if (value == null) {
+            return 0;
+        }
+        return Long.parseLong(value);
+    }
+
+    /**
+     * 移除 session 中的属性
+     * @param request 请求
+     * @param key 属性名
+     */
+    public static void removeSessionAttr(HttpServletRequest request, String key) {
+        HttpSession session = request.getSession();
+        if (session == null) {
+            return;
+        }
+        session.removeAttribute(key);
+    }
 }

server/src/main/java/cn/keking/web/controller/FileController.java

@@ -2,7 +2,9 @@ package cn.keking.web.controller;
 
 import cn.keking.config.ConfigConstants;
 import cn.keking.model.ReturnResponse;
+import cn.keking.utils.DateUtils;
 import cn.keking.utils.KkFileUtils;
+import cn.keking.utils.CaptchaUtil;
 import cn.keking.utils.RarUtils;
 import cn.keking.utils.WebUtils;
 import org.slf4j.Logger;
@@ -11,11 +13,16 @@ import org.springframework.util.ObjectUtils;
 import org.springframework.util.StreamUtils;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 import org.springframework.web.multipart.MultipartFile;
 
+import javax.imageio.ImageIO;
+import javax.servlet.ServletOutputStream;
 import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.awt.image.RenderedImage;
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
@@ -24,6 +31,8 @@ import java.nio.file.Files;
 import java.nio.file.Paths;
 import java.util.*;
 
+import static cn.keking.utils.CaptchaUtil.*;
+
 /**
  * @author yudian-it
  * 2017/12/1
@@ -35,6 +44,7 @@ public class FileController {
 
     private final String fileDir = ConfigConstants.getFileDir();
     private final String demoDir = "demo";
+
     private final String demoPath = demoDir + File.separator;
     public static final String BASE64_DECODE_ERROR_MSG = "Base64解码失败，请检查你的 %s 是否采用 Base64 + urlEncode 双重编码了！";
 
@@ -61,28 +71,11 @@ public class FileController {
 
     @GetMapping("/deleteFile")
     public ReturnResponse<Object> deleteFile(HttpServletRequest request, String fileName, String password) {
-        ReturnResponse<Object> checkResult = this.deleteFileCheck(fileName);
+        ReturnResponse<Object> checkResult = this.deleteFileCheck(request, fileName, password);
         if (checkResult.isFailure()) {
             return checkResult;
         }
         fileName = checkResult.getContent().toString();
-        if(ConfigConstants.getDeleteCaptcha()){
-            String sessionCode;
-            try {
-                sessionCode = request.getSession().getAttribute("code").toString();  //获取已经保存的验证码
-            } catch (Exception e) {
-                sessionCode = "null";
-            }
-            if (!sessionCode.equalsIgnoreCase(password)){
-                logger.error("删除文件【{}】失败，密码错误！",fileName);
-                return ReturnResponse.failure("删除文件失败，密码错误！");
-            }
-        }else {
-            if(!ConfigConstants.getPassword().equalsIgnoreCase(password)) {
-                logger.error("删除文件【{}】失败，密码错误！",fileName);
-                return ReturnResponse.failure("删除文件失败，密码错误！");
-            }
-        }
         File file = new File(fileDir + demoPath + fileName);
         logger.info("删除文件：{}", file.getAbsolutePath());
         if (file.exists() && !file.delete()) {
@@ -90,10 +83,45 @@ public class FileController {
             logger.error(msg);
             return ReturnResponse.failure(msg);
         }
-        request.getSession().removeAttribute("code"); //删除缓存验证码
+        WebUtils.removeSessionAttr(request, captcha_code); //删除缓存验证码
         return ReturnResponse.success();
     }
 
+    /**
+     * 验证码方法
+     */
+    @RequestMapping("/deleteFile/captcha")
+    public void captcha(HttpServletRequest request, HttpServletResponse response) throws Exception {
+        if (!ConfigConstants.getDeleteCaptcha()) {
+            return;
+        }
+
+        response.setContentType("image/jpeg");
+        response.setHeader("Pragma", "no-cache");
+        response.setHeader("Cache-Control", "no-cache");
+        response.setDateHeader("Expires", -1);
+        String captchaCode = WebUtils.getSessionAttr(request, captcha_code);
+        long captchaGenerateTime = WebUtils.getLongSessionAttr(request, captcha_generate_time);
+        long timeDifference = DateUtils.calculateCurrentTimeDifference(captchaGenerateTime);
+
+        Map<String, Object> codeMap;
+
+        // 验证码为空，且生成验证码超过50秒，重新生成验证码
+        if (timeDifference > 50 && ObjectUtils.isEmpty(captchaCode)) {
+            codeMap = CaptchaUtil.generateCaptcha(null);
+            // 更新验证码
+            request.getSession().setAttribute(captcha_code, codeMap.get(captcha_code).toString());
+            request.getSession().setAttribute(captcha_generate_time, DateUtils.getCurrentSecond());
+        } else {
+            captchaCode = ObjectUtils.isEmpty(captchaCode) ? "wait" : captchaCode;
+            codeMap = CaptchaUtil.generateCaptcha(captchaCode);
+        }
+
+        ServletOutputStream sos = response.getOutputStream();
+        ImageIO.write((RenderedImage) codeMap.get(captcha_code_pic), "jpeg", sos);
+        sos.close();
+    }
+
     @GetMapping("/listFiles")
     public List<Map<String, String>> getFiles() {
         List<Map<String, String>> list = new ArrayList<>();
@@ -144,7 +172,7 @@ public class FileController {
      * @param fileName 文件名
      * @return 校验结果
      */
-    private ReturnResponse<Object> deleteFileCheck(String fileName) {
+    private ReturnResponse<Object> deleteFileCheck(HttpServletRequest request, String fileName, String password) {
         if (ObjectUtils.isEmpty(fileName)) {
             return ReturnResponse.failure("文件名为空，删除失败！");
         }
@@ -161,6 +189,16 @@ public class FileController {
         if (KkFileUtils.isIllegalFileName(fileName)) {
             return ReturnResponse.failure("非法文件名，删除失败！");
         }
+        if (ObjectUtils.isEmpty(password)) {
+            return ReturnResponse.failure("密码 or 验证码为空，删除失败！");
+        }
+
+        String expectedPassword = ConfigConstants.getDeleteCaptcha() ? WebUtils.getSessionAttr(request, captcha_code) : ConfigConstants.getPassword();
+
+        if (!password.equalsIgnoreCase(expectedPassword)) {
+            logger.error("删除文件【{}】失败，密码错误！", fileName);
+            return ReturnResponse.failure("删除文件失败，密码错误！");
+        }
         return ReturnResponse.success(fileName);
     }
 

server/src/main/java/cn/keking/web/controller/OnlinePreviewController.java

@@ -1,6 +1,5 @@
 package cn.keking.web.controller;
 
-import cn.keking.config.ConfigConstants;
 import cn.keking.model.FileAttribute;
 import cn.keking.service.FileHandlerService;
 import cn.keking.service.FilePreview;
@@ -8,7 +7,6 @@ import cn.keking.service.FilePreviewFactory;
 import cn.keking.service.cache.CacheService;
 import cn.keking.service.impl.OtherFilePreviewImpl;
 import cn.keking.utils.KkFileUtils;
-import cn.keking.utils.RandomValidateCodeUtil;
 import cn.keking.utils.WebUtils;
 import fr.opensagres.xdocreport.core.io.IOUtils;
 import io.mola.galimatias.GalimatiasParseException;
@@ -17,17 +15,12 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
-import org.springframework.util.ObjectUtils;
 import org.springframework.util.StringUtils;
 import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.ResponseBody;
 
-import javax.imageio.ImageIO;
-import javax.servlet.ServletOutputStream;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
-import java.awt.image.RenderedImage;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.UnsupportedEncodingException;
@@ -35,11 +28,8 @@ import java.net.HttpURLConnection;
 import java.net.URL;
 import java.net.URLDecoder;
 import java.nio.charset.StandardCharsets;
-import java.text.SimpleDateFormat;
 import java.util.Arrays;
-import java.util.Date;
 import java.util.List;
-import java.util.Map;
 
 import static cn.keking.service.FilePreview.PICTURE_FILE_PREVIEW_PAGE;
 
@@ -199,82 +189,6 @@ public class OnlinePreviewController {
             }
         }
     }
-    /**
-     * 验证码方法
-     */
-    @RequestMapping("/captcha")
-    public void captcha(HttpServletRequest request, HttpServletResponse response) throws Exception {
-        if(!ConfigConstants.getDeleteCaptcha()){
-            return;
-        }
-        response.setContentType("image/gif");
-        response.setHeader("Pragma", "No-cache");
-        response.setHeader("Cache-Control", "no-cache");
-        response.setDateHeader("Expires", 0);
-        Date date = new Date();   // 当前时间
-        SimpleDateFormat formater = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");   // 设置时间格式
-        String sessionCode;
-        try {
-             sessionCode = request.getSession().getAttribute("code").toString();  //获取已经保存的验证码
-        } catch (Exception e) {
-            sessionCode= null;
-        }
-        Object time = request.getSession().getAttribute("time");  //获取已经保存的时间
-        if (ObjectUtils.isEmpty(time)){  //判断时间是否为空
-            request.getSession().setAttribute("time", formater.format(date));  //为空重新添加缓存时间
-            time = request.getSession().getAttribute("time");
-        }
-        Date joinTime =  formater.parse(String.valueOf(time));
-        String dateStart = formater.format(joinTime);
-        Date d1=formater.parse(dateStart);
-        // 时间差：
-        long diff = date.getTime() - d1.getTime();
-        long diffSeconds = diff / 1000 % 60;
-        String ip=request.getRemoteAddr();
-        ServletOutputStream sos = null;
-        if (ObjectUtils.isEmpty(sessionCode) ||  diffSeconds > 50){   //判断验证码是否为空 为空重新生成  判断是否在有效时间内 默认50秒
-            Map<String, Object> codeMap = RandomValidateCodeUtil.generateCodeAndPic(ip,sessionCode,0);
-            // 验证码存入session
-            request.getSession().setAttribute("code", codeMap.get("code").toString());
-            // 时间存入session
-            request.getSession().setAttribute("time", formater.format(date));
-            // 禁止图像缓存。
-            response.setHeader("Pragma", "no-cache");
-            response.setHeader("Cache-Control", "no-cache");
-            response.setDateHeader("Expires", -1);
-            response.setContentType("image/jpeg");
-            // 将图像输出到Servlet输出流中。
-            try {
-                sos = response.getOutputStream();
-                ImageIO.write((RenderedImage) codeMap.get("codePic"), "jpeg", sos);
-            } catch (IOException e) {
-                e.printStackTrace();
-            } finally {
-                assert sos != null;
-                sos.close();
-            }
-        }else {
-           // System.out.println("请输入你的姓名:");
-            Map<String, Object> codeMap = RandomValidateCodeUtil.generateCodeAndPic(ip,sessionCode,1);
-            // 禁止图像缓存。
-            response.setHeader("Pragma", "no-cache");
-            response.setHeader("Cache-Control", "no-cache");
-            response.setDateHeader("Expires", -1);
-            response.setContentType("image/jpeg");
-            // 将图像输出到Servlet输出流中。
-            try {
-                sos = response.getOutputStream();
-                ImageIO.write((RenderedImage) codeMap.get("codePic"), "jpeg", sos);
-            } catch (IOException e) {
-                e.printStackTrace();
-            } finally {
-                assert sos != null;
-                sos.close();
-            }
-
-        }
-
-    }
 
     /**
      * 通过api接口入队

server/src/main/resources/web/main/index.ftl

@@ -201,7 +201,7 @@
 <script>
     <#if deleteCaptcha >
     function deleteFile(fileName) {
-        var codename =`<div class="code"><h4>请输入下面删除码!</h4><div><img id="verImg" width="130px" height="48px" src="/captcha"></div><form><input type="type" oninput="if(value.length>5)value=value.slice(0,5);" class="code-input"  id="_code" placeholder="请输入验证码"><button id="deleteFile1" type="button" class="btn btn-success">提交</button></form><button id="close" type="button"class="btn btn-danger">关闭</button></div>`;
+        var codename =`<div class="code"><h4>请输入下面删除码!</h4><div><img id="verImg" width="130px" height="48px" src="/deleteFile/captcha"></div><form><input type="type" oninput="if(value.length>5)value=value.slice(0,5);" class="code-input"  id="_code" placeholder="请输入验证码"><button id="deleteFile1" type="button" class="btn btn-success">提交</button></form><button id="close" type="button"class="btn btn-danger">关闭</button></div>`;
         $('#codeContent').html(codename);
         var code = document.querySelector('.code');
         var closeBtn = document.getElementById("close");
@@ -213,15 +213,14 @@
         closedelete.addEventListener('click', deleteFile1);
         function deleteFile1(){
             var password = $("#_code").val();
-//console.log(password);
             $.ajax({
                     url: '${baseUrl}deleteFile?fileName=' + fileName +'&password='+password,
                 success: function (data) {
-                    // console.log(data);
-                    // 删除完成，刷新table
                     if ("删除文件失败，密码错误！" === data.msg) {
                         alert(data.msg);
                     } else {
+                        //刷新验证码
+                        document.getElementById('verImg').click();
                         $('#table').bootstrapTable('refresh', {});
                         code.style.display = 'none';
                     }
@@ -241,7 +240,7 @@
                 xhr = new ActiveXObject("Microsoft.XMLHTTP");
             }
             //2、调用open
-            xhr.open("get", "/captcha", true);
+            xhr.open("get", "/deleteFile/captcha", true);
             xhr.responseType = "blob";
             //3、调用send
             xhr.send();
@@ -279,6 +278,7 @@
                     if ("删除文件失败，密码错误！" === data.msg) {
                         alert(data.msg);
                     } else {
+
                         $('#table').bootstrapTable('refresh', {});
                     }
                 },