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  • [html5+java]文件异步读取及上传核心代码

    html5+java 文件异步读取及上传关键代码段

    功能：

    1.多文件文件拖拽上传，file input 多文件选择

    2.html5 File Api 异步FormData，blob上传，图片显示

    3.java端接受

    核心代码：

    1.拖拽代码段：

     1 <div id="dropzone">
 2     <div>Drag & drop your file here...</div>
 3     <div id='showFile'></div>
 4     <div style='clear: both'></div>
 5 </div>
 6 
 7 <script>
 8     /*function for drag and drop*/
 9     window.onload = function() {
10         var dropzone = document.getElementById("dropzone");
11         dropzone.ondragover = dropzone.ondragenter = function(event) {
12             event.preventDefault();
13             event.stopPropagation();
14         }
15         dropzone.ondrop = function(event) {
16             event.preventDefault();
17             var filesArray = event.dataTransfer.files;
18             for ( var i = 0; i < filesArray.length; i++) {
19                 var fObj = new fileObj(filesArray[i], idTmp);
20                 // to do tasks with dropData
21             }
22             event.stopPropagation();
23         }
24     }
25 </script>
    View Code

    file input 多文件选择：

     1 <p>
 2 Upload File: <input id='uploadFile' type="file" name="file" multiple />
 3 </p>
 4 
 5 <script>
 6 $("#uploadFile").change(function(e) {
 7     event.preventDefault();
 8     var filesArray = e.target.files;
 9     for ( var i = 0; i < filesArray.length; i++) {
10         var fObj = new fileObj(filesArray[i], idTmp);
11         // to do tasks with dropData
12         idTmp++;
13     }
14     event.stopPropagation();
15 });
16 </script>
    View Code

    2.html5 File Api 异步上传:

    1).使用FormData上传

     1 <!DOCTYPE html>
 2 <html>
 3 <head>
 4     <title>Upload Files using XMLHttpRequest - Minimal</title>
 5 
 6     <script type="text/javascript">
 7       function fileSelected() {
 8         var file = document.getElementById('fileToUpload').files[0];
 9         if (file) {
10           var fileSize = 0;
11           if (file.size > 1024 * 1024)
12             fileSize = (Math.round(file.size * 100 / (1024 * 1024)) / 100).toString() + 'MB';
13           else
14             fileSize = (Math.round(file.size * 100 / 1024) / 100).toString() + 'KB';
15 
16           document.getElementById('fileName').innerHTML = 'Name: ' + file.name;
17           document.getElementById('fileSize').innerHTML = 'Size: ' + fileSize;
18           document.getElementById('fileType').innerHTML = 'Type: ' + file.type;
19         }
20       }
21 
22       function uploadFile() {
23         var fd = new FormData();
24         fd.append("fileToUpload", document.getElementById('fileToUpload').files[0]);
25         var xhr = new XMLHttpRequest();
26         xhr.upload.addEventListener("progress", uploadProgress, false);
27         xhr.addEventListener("load", uploadComplete, false);
28         xhr.addEventListener("error", uploadFailed, false);
29         xhr.addEventListener("abort", uploadCanceled, false);
30         xhr.open("POST", "UploadMinimal.aspx");
31         xhr.send(fd);
32       }
33 
34       function uploadProgress(evt) {
35         if (evt.lengthComputable) {
36           var percentComplete = Math.round(evt.loaded * 100 / evt.total);
37           document.getElementById('progressNumber').innerHTML = percentComplete.toString() + '%';
38         }
39         else {
40           document.getElementById('progressNumber').innerHTML = 'unable to compute';
41         }
42       }
43 
44       function uploadComplete(evt) {
45         /* This event is raised when the server send back a response */
46         alert(evt.target.responseText);
47       }
48 
49       function uploadFailed(evt) {
50         alert("There was an error attempting to upload the file.");
51       }
52 
53       function uploadCanceled(evt) {
54         alert("The upload has been canceled by the user or the browser dropped the connection.");
55       }
56     </script>
57 </head>
58 <body>
59 <form id="form1" enctype="multipart/form-data" method="post" action="upload.php">
60 <div class="row">
61       <label for="fileToUpload">Select a File to Upload</label>
62 <input type="file" name="fileToUpload" id="fileToUpload" onchange="fileSelected();"/>
63     </div>
64 <div id="fileName"></div>
65 <div id="fileSize"></div>
66 <div id="fileType"></div>
67 <div class="row">
68 <input type="button" onclick="uploadFile()" value="Upload" />
69     </div>
70 <div id="progressNumber"></div>
71 </form>
72 
73 </body>
74 </html>
    View Code

    2).使用blob，readAsBinaryString上传

      1 <!DOCTYPE html>
  2 <html>
  3 <head>
  4 <meta charset="UTF-8">
  5 <title>HTML5 File Upload[By WangXinsheng]</title>
  6 <script src="../js/jquery-1.11.1.min.js"></script>
  7 </head>
  8 <style>
  9 #dropzone {
 10     margin-top: 10px;
 11     width: 500px;
 12     min-height: 300px;
 13     height: 100%;
 14     border: 1px dotted grey;
 15 }
 16 
 17 header {
 18     font-weight: bold;
 19 }
 20 
 21 .uploadFile {
 22     display: inline;
 23     float: left;
 24     width: 45%;
 25     border: 1px solid gray;
 26     margin: 5px;
 27     min-height: 20px;
 28     padding-bottom: 5px;
 29     padding-left: 5px;
 30 }
 31 
 32 .uploadFile p {
 33     margin: 2px;
 34 }
 35 
 36 .uploadFile progress {
 37     -webkit-appearance: none;
 38 }
 39 .uploadFile .ok{
 40     cursor:pointer;
 41 }
 42 
 43 .uploadFile ::-webkit-progress-inner-element {
 44     
 45 }
 46 
 47 .uploadFile ::-webkit-progress-bar {
 48     background: white;
 49     border: 1px solid gray;
 50 }
 51 
 52 .uploadFile ::-webkit-progress-value {
 53     background: green;
 54 }
 55 
 56 .uploadFile ::-moz-progress-bar {
 57     background: white
 58 }
 59 
 60 .uploadFile ::-ms-fill {
 61     background: green;
 62 }
 63 </style>
 64 <body>
 65     <header>HTML5 File Upload</header>
 66     <p>
 67         Upload File: <input id='uploadFile' type="file" name="file" multiple />
 68     </p>
 69 
 70     <div id="dropzone">
 71         <div>Drag & drop your file here...</div>
 72         <div id='showFile'></div>
 73         <div style='clear: both'></div>
 74     </div>
 75     <script>
 76         var oneFileDom = "<div class='uploadFile' id='uf_{%id%}'>"
 77         +"<p>{%name%}</p>"
 78         +"<progress width='100%'></progress>"
 79         +"<span class='ok' style='display:none;padding-left:10px;color:green;font-weight:bold__:bold;'>转换</span>"
 80         +"</div>";
 81         var idTmp = 0;
 82         /*all file obj list*/
 83         var fileObjLst = [];
 84         /*file object*/
 85         var fileObj = function(file, id) {
 86             this.fileName;
 87             this.file = file;
 88             this.uploadSize = 0;
 89             this.finishFlg = false;
 90             this.sliceStart = 0;
 91             this.maxPiece = 0;
 92             this.blockCount = 0;
 93             this.blockCur = 0;
 94             this.reader = null;
 95             this.dom;
 96             this.id = id;
 97             this.xhr;
 98         }
 99         fileObj.prototype.init = function() {
100             var tmpPiece = Math.ceil(this.file.size * 0.5);
101             this.maxPiece = tmpPiece > 1024 * 1024 * 0.2 ? 1024 * 1024 * 0.2
102                     : (tmpPiece < 1024 * 1024 * 0.1 ? 1024 * 1024 *0.1: tmpPiece);
103             this.blockCount = Math.ceil(this.file.size / this.maxPiece);
104             this.sliceEnd = this.maxPiece;
105             this.fileName = new Date().getTime();
106             $("#showFile").prepend(
107                     $(oneFileDom.replace('{%id%}', this.id).replace("{%name%}",
108                             this.file.name)));
109         }
110         fileObj.prototype.send = function() {
111             console.log(this.id);
112             $("#uf_" + this.id).find("progress").attr("value", '0');
113             $("#uf_" + this.id).find("progress").attr("max",
114                     this.file.size + '');
115 
116             this.reader = new FileReader();
117 
118             this.Bind(this.reader, "loadend", this.onloadend, this);
119             this.Bind(this.reader, "loadstart", this.onloadstart, this);
120             this.Bind(this.reader, "progress", this.onprogress, this);
121             this.Bind(this.reader, "load", this.onload, this);
122 
123             var blob, file = this.file;
124             console.log(file);
125             try {
126                 blob = sliceBlob(file, this.sliceStart, this.sliceStart
127                         + this.maxPiece + 1);
128             } catch (e) {
129                 console.log("error:" + e);
130             }
131             this.sliceStart = this.sliceStart + this.maxPiece + 1;
132             this.reader.readAsBinaryString(blob);
133         }
134         fileObj.prototype.onload = function() {
135             // 这个事件在读取成功结束后触发
136             console.log("load complete");
137         }
138         fileObj.prototype.onloadstart = function() {
139             // 这个事件在读取开始时触发
140             console.log("onloadstart");
141             //document.getElementById("bytesTotal").innerHTML = file.size;
142         }
143         fileObj.prototype.onprogress = function(p) {
144             // 这个事件在读取进行中定时触发
145             console.log("onprogress");
146             //document.getElementById("bytesRead").textContent = p.loaded;
147         }
148         fileObj.prototype.onloadend = function() {
149             // 这个事件在读取结束后，无论成功或者失败都会触发
150             //console.log(this.id);
151             if (this.reader.error) {
152                 console.log(this.reader.error);
153             } else {
154                 var url1 = "/ExcelToWord/morning?over=0&fileName=["
155                         + this.fileName + "]" + this.file.name, url2 = "/ExcelToWord/morning?over=1&fileName=["
156                         + this.fileName + "]" + this.file.name, url = url1;
157                 this.blockCur++;
158 
159                 this.uploadSize = ((this.sliceStart - 1) < this.file.size) ? (this.sliceStart - 1)
160                         : this.file.size;
161                 $("#uf_" + this.id).find("progress").attr("value",
162                         this.uploadSize + '');
163                 console.log(this.uploadSize, this.file.size);
164                 if (this.blockCur > this.blockCount) {
165                     //$("#uf_"+this.id).find(".ok").show();
166                     console.log('over');
167                     return;
168                 } else if (this.blockCur == this.blockCount) {
169                     // last piece
170                     console.log('last');
171                     url = url2;
172                 }
173                 console.log(this.blockCur, this.blockCount);
174                 // 构造 XMLHttpRequest 对象，发送文件 Binary 数据
175                 var me = this;
176                 this.xhr = new XMLHttpRequest();
177                 this.xhr.open("POST", url);
178                 this.xhr.overrideMimeType("application/octet-stream");
179                 this.xhr.sendAsBinary(this.reader.result);
180                 this.Bind(this.xhr, "readystatechange",
181                         this.onreadystatechange, this);
182             }
183         }
184         fileObj.prototype.onreadystatechange = function() {
185             var me = this;
186             if (this.xhr.readyState == 4) {
187                 if (this.xhr.status == 200) {
188                     console.log("upload complete");
189                     console.log("response: " + this.xhr.responseText);
190                     console.log("hello" + me.id);
191                     var json = eval("(" + this.xhr.responseText + ")");
192                     console.log(json.over);
193                     if (json.over == "1") {
194                         $("#uf_" + this.id).find(".ok").attr("serverName",
195                                 json.data);
196                         $("#uf_" + this.id).find(".ok").show();
197                         console.log('over');
198                         return;
199                     }
200                     var blob, file = me.file;
201                     try {
202                         blob = sliceBlob(file, me.sliceStart, me.sliceStart
203                                 + me.maxPiece + 1);
204                     } catch (e) {
205                         console.log("error:" + e);
206                     }
207                     me.sliceStart = me.sliceStart + me.maxPiece + 1;
208                     me.reader.readAsBinaryString(blob);
209                 }
210             }
211         }
212         fileObj.prototype.Bind = function(control, eventName, callBack, scope) {
213             if (!scope) {
214                 scope = window;
215             }
216             $(control).bind(eventName, function() {
217                 callBack.apply(scope, arguments);
218             });
219         }
220         function sliceBlob(blob, start, end, type) {
221 
222             type = type || blob.type;
223 
224             if (blob.mozSlice) {
225                 return blob.mozSlice(start, end, type);
226             } else if (blob.webkitSlice) {
227                 return blob.webkitSlice(start, end, type);
228             } else if (blob.slice) {
229                 return blob.slice(start, end, type);
230             } else {
231                 throw new Error("This doesn't work!");
232             }
233         }
234         /*function for drag and drop*/
235         window.onload = function() {
236             var dropzone = document.getElementById("dropzone");
237             dropzone.ondragover = dropzone.ondragenter = function(event) {
238                 event.preventDefault();
239                 event.stopPropagation();
240             }
241             dropzone.ondrop = function(event) {
242                 event.preventDefault();
243                 var filesArray = event.dataTransfer.files;
244                 for ( var i = 0; i < filesArray.length; i++) {
245                     var fObj = new fileObj(filesArray[i], idTmp);
246                     fObj.init();
247                     fObj.send(fObj);
248                     fileObjLst.push(fObj);
249                     idTmp++;
250                 }
251                 event.stopPropagation();
252             }
253             $("#uploadFile").change(function(e) {
254                 event.preventDefault();
255                 var filesArray = e.target.files;
256                 for ( var i = 0; i < filesArray.length; i++) {
257                     var fObj = new fileObj(filesArray[i], idTmp);
258                     fObj.init();
259                     fObj.send(fObj);
260                     fileObjLst.push(fObj);
261                     idTmp++;
262                 }
263                 event.stopPropagation();
264             });
265         }
266 
267         if (window.navigator.userAgent.toLowerCase().indexOf("chrome") > -1) {
268             XMLHttpRequest.prototype.sendAsBinary = function(datastr) {
269                 function byteValue(x) {
270                     return x.charCodeAt(0) & 0xff;
271                 }
272                 var ords = Array.prototype.map.call(datastr, byteValue);
273                 var ui8a = new Uint8Array(ords);
274                 this.send(ui8a.buffer);
275             }
276         }
277     </script>
278 </body>
279 </html>
    View Code

    3).Image 文件上传本地预览

    1 // 图片文件
2 var reader = new FileReader();
3 reader.readAsDataURL(imageFile);
4 // reader读取完成的回调，设置src属性，显示图片.
5 // 或者设置css的背景属性都可
6 reader.onload = function(e) {
7         document.getElementById('imageId').src = e.target.result;
8 }
    View Code

    3.java端接受

     1     @RequestMapping("/url")
 2     @ResponseBody
 3     public Map<String, Object> handleRequest(HttpServletRequest request,
 4             HttpServletResponse response) throws Exception  {
 5         String fileName = request.getParameter("fileName");
 6         fileName = new String(fileName.getBytes("ISO-8859-1"),"UTF-8");
 7         String overFlg = request.getParameter("over"); // 0:go on;1:over
 8         System.out.println("get: " + fileName);
 9         byte[] buf = new byte[1024];
10 
11         File file = new File(ExcelTmpPath + /*"[" + UUID.randomUUID().toString()
12                 + "]" +*/ fileName);
13         InputStream is = null;
14         BufferedOutputStream fileOut = new BufferedOutputStream(
15                 new FileOutputStream(file, true));
16         try {
17 
18             is = request.getInputStream();
19 
20             while (true) {
21 
22                 int bytesIn = is.read(buf, 0, 1024);
23                 System.out.println(bytesIn);
24                 if (bytesIn == -1) {
25                     break;
26                 } else {
27                     fileOut.write(buf, 0, bytesIn);
28                 }
29             }
30 
31             fileOut.flush();
32             fileOut.close();
33             System.out.println(file.getAbsolutePath());
34         } catch (IOException e) {
35             System.out.println("error  info");
36         }
37         Map<String, Object> map = new HashMap<String, Object>();
38         map.put("over", overFlg);
39         map.put("data", fileName);
40         return map;
41     }
    View Code
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  • 原文地址：https://www.cnblogs.com/wangxinsheng/p/4321284.html
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