• 解决kkFileView4.4.0版本pdf、word不能预览问题

    这里使用的是http下载流url预览，遇到的问题。

    官方使用指南：kkFileView - 在线文件预览

    1 前端测试代码

    1.1 官方示例代码

    1.2 本人测试代码

    注意：要给预览文件的url进行编码encodeURIComponent(Base64.encode(previewUrl))。

    1. html>
    2. <html lang="en">
    3. <head>
    4.     <meta charset="UTF-8">
    5.     <title>Titletitle>
    6.  
    7. head>
    8. <body>
    9. <h2>在线预览h2>
    10. <button type="button" onclick="kkFileView()">点击在线预览button>
    11. body>
    12. html>
    13. <script>
    14.     var Base64 = {
    15.  
    16.         // private property
    17.         _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
    18.  
    19.         //从普通字符串转换成Base64字符串的函数
    20.         encode : function (input) {
    21.             var output = "";
    22.             var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
    23.             var i = 0;
    24.             input = Base64._utf8_encode(input);
    25.             while (i < input.length) {
    26.                 chr1 = input.charCodeAt(i++);
    27.                 chr2 = input.charCodeAt(i++);
    28.                 chr3 = input.charCodeAt(i++);
    29.                 enc1 = chr1 >> 2;
    30.                 enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
    31.                 enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
    32.                 enc4 = chr3 & 63;
    33.                 if (isNaN(chr2)) {
    34.                     enc3 = enc4 = 64;
    35.                 } else if (isNaN(chr3)) {
    36.                     enc4 = 64;
    37.                 }
    38.                 output = output +
    39.                     Base64._keyStr.charAt(enc1) + Base64._keyStr.charAt(enc2) +
    40.                     Base64._keyStr.charAt(enc3) + Base64._keyStr.charAt(enc4);
    41.             }
    42.             return output;
    43.         },
    44.  
    45.         //从Base64字符串转换成普通字符串的函数
    46.         decode : function (input) {
    47.             var output = "";
    48.             var chr1, chr2, chr3;
    49.             var enc1, enc2, enc3, enc4;
    50.             var i = 0;
    51.             input = input.replace(/[^A-Za-z0-9+/=]/g, "");
    52.             while (i < input.length) {
    53.                 enc1 = Base64._keyStr.indexOf(input.charAt(i++));
    54.                 enc2 = Base64._keyStr.indexOf(input.charAt(i++));
    55.                 enc3 = Base64._keyStr.indexOf(input.charAt(i++));
    56.                 enc4 = Base64._keyStr.indexOf(input.charAt(i++));
    57.                 chr1 = (enc1 << 2) | (enc2 >> 4);
    58.                 chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
    59.                 chr3 = ((enc3 & 3) << 6) | enc4;
    60.                 output = output + String.fromCharCode(chr1);
    61.                 if (enc3 != 64) {
    62.                     output = output + String.fromCharCode(chr2);
    63.                 }
    64.                 if (enc4 != 64) {
    65.                     output = output + String.fromCharCode(chr3);
    66.                 }
    67.             }
    68.             output = Base64._utf8_decode(output);
    69.             return output;
    70.         },
    71.  
    72.         //将普通字符串转换成UTF8编码的函数
    73.         _utf8_encode : function (string) {
    74.             string = string.replace(/\r\n/g,"\n");
    75.             var utftext = "";
    76.             for (var n = 0; n < string.length; n++) {
    77.                 var c = string.charCodeAt(n);
    78.                 if (c < 128) {
    79.                     utftext += String.fromCharCode(c);
    80.                 }
    81.                 else if((c > 127) && (c < 2048)) {
    82.                     utftext += String.fromCharCode((c >> 6) | 192);
    83.                     utftext += String.fromCharCode((c & 63) | 128);
    84.                 }
    85.                 else {
    86.                     utftext += String.fromCharCode((c >> 12) | 224);
    87.                     utftext += String.fromCharCode(((c >> 6) & 63) | 128);
    88.                     utftext += String.fromCharCode((c & 63) | 128);
    89.                 }
    90.             }
    91.             return utftext;
    92.         },
    93.  
    94.         //将UTF8编码的字符串转换成普通字符串的函数
    95.         _utf8_decode : function (utftext) {
    96.             var string = "";
    97.             var i = 0;
    98.             var c = c1 = c2 = 0;
    99.             while ( i < utftext.length ) {
    100.                 c = utftext.charCodeAt(i);
    101.                 if (c < 128) {
    102.                     string += String.fromCharCode(c);
    103.                     i++;
    104.                 }
    105.                 else if((c > 191) && (c < 224)) {
    106.                     c2 = utftext.charCodeAt(i+1);
    107.                     string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
    108.                     i += 2;
    109.                 }
    110.                 else {
    111.                     c2 = utftext.charCodeAt(i+1);
    112.                     c3 = utftext.charCodeAt(i+2);
    113.                     string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
    114.                     i += 3;
    115.                 }
    116.             }
    117.             return string;
    118.         }
    119.     }
    120.  
    121.   function kkFileView(){
    122.     // pdf的文件流
    123.     var originUrl  = 'http://192.168.1.58:8080/getFile?s/lV3bcibQiz34TStDR0NJ3tYfr1fqIvKRrtvEOy5ATi3a7u18wax87gN4DWjch/hcpeqQS8mQMoAYMDIXRzEpqtYk0H7DV/+pmYS/KtdPpk0tQrLSnT5OK8ND6QQgaTypPSswbJNvwhs+l5fE4GHLnvBX+kD9J42YAKO6VzAdzFmyonGjiAbegeLD4QspUcXXsdNSzz/7fDeRjDzc0M+HlMMS8/CiuMUmHqL4ErjuNF4Mn3s42UveYOHlukb0p4PCIJlhZeRBx4zXlTOcLlXItZKVb6gBVHVBH9e6ZpfTuIQJ4VRSN3twEOuIsBZ83w3SIepUH9oaA=';
    124.     // 使用fullfilename=xxx给文件指定名称
    125.     var previewUrl = originUrl + '&fullfilename=1.pdf';
    126.     window.open('http://127.0.0.1:8012/onlinePreview?url='+encodeURIComponent(Base64.encode(previewUrl)))
    127.   }
    128. script>

    2 测试

    点击在线预览按钮出现以下情况：

    3 解决下载失败报错 

    3.1 报错信息 

    下载失败:org.springframework.web.client.HttpServerErrorException$InternalServerError: 500 Internal Server Error: [<a href="https://so.csdn.net/so/search?q=Apache&spm=1001.2101.3001.7020" target="_blank" class="hl hl-1" data-report-view="{"spm":"1001.2101.3001.7020","dest":"https://so.csdn.net/so/search?q=Apache&spm=1001.2101.3001.7020","extra":"{\"searchword\":\"Apache\"}"}" data-report-click="{"spm":"1001.2101.3001.7020","dest":"https://so.csdn.net/so/search?q=Apache&spm=1001.2101.3001.7020","extra":"{\"searchword\":\"Apache\"}"}" data-tit="Apache" data-pretit="apache">Apache</a> Tomcat/8.0.30 - Error report