Input box to upload multiple files

<span id="Label3"></p> <ol> <ol> <li>By adding the multiple attribute to the input tag, you can select multiple files in one input box to upload</li> </ol> </ol><pre><pre><code>multiple="multiple"</code>/><br>Of course, This is the same:</pre></pre><pre><pre><code>multiple</code>/></pre></pre><p><p>2. Many times when uploading, we have to limit the upload file type (</p></p><pre><pre>In windows, the main limitation is the suffix name</pre></pre><pre><pre>), or the selected file name (path) to the current page, <br> which requires JS to obtain the name of the selected File: <br> <br> <span style="color: #ff0000;" document.getelementbyid ("input"). files[i].name < span> <br> <br> 3. Background receive, Java depends on the framework used, Struts should only need to change the corresponding member variable to the group of OK (speculation), <br> Older projects, may not reference the framework, or the framework does not consider this part, you need to modify the file upload code, here <br> only one of the cases (i encountered). <br> <br> <span style="color: #ff0000;"> <strong> The stream received in the background is placed in a map, but when put, the map key uses the Label's name property, which causes </strong> </span> <br> <strong> <span style="color: #ff0000;"> The selected files can only be attached to a single file (the key value in the map cannot be duplicated, and the previous put is overwritten by the subsequent one). </span> </strong> <br> <br> This can be used to upload the file is the famous map of the key value, which will affect the other modules, mainly in the map of the key changes, the other module <br> when the flow is obtained, It may not be possible (there is a big difference between the sign and the file name). <br> My approach is to bury a hidden on the page, use JS to populate the name of the uploaded file (note that there are multiple), so that the background can get the name of the uploaded file, <br> and then there is nothing to do with me <br> <br> <br> <br> with a demo: </span></pre></pre><p><p><! DOCTYPE html><br>