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[Java教程]移动端HTML5实现文件上传


PC端上传文件多半用插件,引入flash都没关系,但是移动端要是还用各种冗余的插件估计得被喷死,项目里面需要做图片上传的功能,既然H5已经有相关的接口且兼容性良好,当然优先考虑用H5来实现。

用的技术主要是:

ajax

FileReader

FormData

HTML结构:

<div class="camera-area">   <form enctype="multipart/form-data" method="post">    <input type="file" name="fileToUpload" class="fileToUpload" accept="image/*" capture="camera"/>     <div class="upload-progress"><span></span></div>    </form>   <div class="thumb"></div> </div>

已经封装好的upload.js,依赖zepto

(function($) { $.extend($.fn, {  fileUpload: function(opts) {   this.each(function() {    var $self = $(this);    var doms = {     "fileToUpload": $self.find(".fileToUpload"),     "thumb": $self.find(".thumb"),     "progress": $self.find(".upload-progress")    };    var funs = {     //选择文件,获取文件大小,也可以在这里获取文件格式,限制用户上传非要求格式的文件     "fileSelected": function() {      var files = (doms.fileToUpload)[0].files;      var count = files.length;      for (var index = 0; index < count; index++) {       var file = files[index];       var fileSize = 0;       if (file.size > 1024 * 1024)        fileSize = (Math.round(file.size * 100 / (1024 * 1024)) / 100).toString() + 'MB';       else        fileSize = (Math.round(file.size * 100 / 1024) / 100).toString() + 'KB';      }      funs.uploadFile();     },     //异步上传文件     uploadFile: function() {      var fd = new FormData();//创建表单数据对象      var files = (doms.fileToUpload)[0].files;      var count = files.length;      for (var index = 0; index < count; index++) {       var file = files[index];       fd.append(opts.file, file);//将文件添加到表单数据中       funs.previewImage(file);//上传前预览图片,也可以通过其他方法预览txt      }      var xhr = new "progress", funs.uploadProgress, false);//监听上传进度      xhr.addEventListener("load", funs.uploadComplete, false);      xhr.addEventListener("error", opts.uploadFailed, false);      xhr.open("POST", opts.url);      xhr.send(fd);     },     //文件预览     previewImage: function(file) {      var gallery = doms.thumb;      var img = document.createElement("img");      img.file = file;      doms.thumb.html(img);      // 使用FileReader方法显示图片内容      var reader = new FileReader();      reader.onload = (function(aImg) {       return function(e) {        aImg.src = e.target.result;       };      })(img);      reader.readAsDataURL(file);     },     uploadProgress: function(evt) {      if (evt.lengthComputable) {       var percentComplete = Math.round(evt.loaded * 100 / evt.total);       doms.progress.html(percentComplete.toString() + '%');      }     },     "uploadComplete": function(evt) {      alert(evt.target.responseText)     }    };    doms.fileToUpload.on("change", function() {     doms.progress.find("span").width("0");     funs.fileSelected();    });   });  } });})(Zepto);

调用方法:

$(".camera-area").fileUpload({    "url": "savetofile.php",    "file": "myFile"   });

PHP部分:

<?phpif (isset($_FILES['myFile'])) {  // Example:  writeLog($_FILES);  move_uploaded_file($_FILES['myFile']['tmp_name'], "uploads/" . $_FILES['myFile']['name']);  echo 'successful';}function writeLog($log){  if(is_array($log) || is_object($log)){    $log = json_encode($log);  }  $log = $log."\r\n";  file_put_contents('log.log', $log,FILE_APPEND);}?>

 点击这里下载源码