97 lines
3.9 KiB
Plaintext
97 lines
3.9 KiB
Plaintext
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title>XMLHttpRequest上传文件</title>
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<script type="text/javascript">
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//图片上传
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var xhr;
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//上传文件方法
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function UpladFile() {
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var fileObj = document.getElementById("file").files[0]; // js 获取文件对象
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var url = "http://localhost:8080" + "/api/attachment/upload"; // 接收上传文件的后台地址
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var form = new FormData(); // FormData 对象
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form.append("file", fileObj); // 文件对象
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xhr = new XMLHttpRequest(); // XMLHttpRequest 对象
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xhr.open("post", url, true); //post方式，url为服务器请求地址，true 该参数规定请求是否异步处理。
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xhr.onload = uploadComplete; //请求完成
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xhr.onerror = uploadFailed; //请求失败
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xhr.upload.onprogress = progressFunction;//【上传进度调用方法实现】
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xhr.upload.onloadstart = function(){//上传开始执行方法
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ot = new Date().getTime(); //设置上传开始时间
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oloaded = 0;//设置上传开始时，以上传的文件大小为0
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};
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xhr.send(form); //开始上传，发送form数据
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}
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//上传成功响应
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function uploadComplete(evt) {
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//服务断接收完文件返回的结果
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var data = JSON.parse(evt.target.responseText);
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if(data.success) {
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alert("上传成功！");
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}else{
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alert("上传失败！");
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}
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}
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//上传失败
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function uploadFailed(evt) {
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alert("上传失败！");
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}
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//取消上传
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function cancleUploadFile(){
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xhr.abort();
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}
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//上传进度实现方法，上传过程中会频繁调用该方法
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function progressFunction(evt) {
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var progressBar = document.getElementById("progressBar");
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var percentageDiv = document.getElementById("percentage");
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// event.total是需要传输的总字节，event.loaded是已经传输的字节。如果event.lengthComputable不为真，则event.total等于0
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if (evt.lengthComputable) {//
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progressBar.max = evt.total;
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progressBar.value = evt.loaded;
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percentageDiv.innerHTML = Math.round(evt.loaded / evt.total * 100) + "%";
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}
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var time = document.getElementById("time");
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var nt = new Date().getTime();//获取当前时间
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var pertime = (nt-ot)/1000; //计算出上次调用该方法时到现在的时间差，单位为s
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ot = new Date().getTime(); //重新赋值时间，用于下次计算
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var perload = evt.loaded - oloaded; //计算该分段上传的文件大小，单位b
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oloaded = evt.loaded;//重新赋值已上传文件大小，用以下次计算
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//上传速度计算
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var speed = perload/pertime;//单位b/s
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var bspeed = speed;
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var units = 'b/s';//单位名称
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if(speed/1024>1){
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speed = speed/1024;
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units = 'k/s';
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}
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if(speed/1024>1){
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speed = speed/1024;
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units = 'M/s';
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}
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speed = speed.toFixed(1);
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//剩余时间
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var resttime = ((evt.total-evt.loaded)/bspeed).toFixed(1);
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time.innerHTML = '，速度：'+speed+units+'，剩余时间：'+resttime+'s';
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if(bspeed==0) time.innerHTML = '上传已取消';
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}
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</script>
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</head>
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<body>
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<progress id="progressBar" value="0" max="100" style="width: 300px;"></progress>
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<span id="percentage"></span><span id="time"></span>
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<br /><br />
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<input type="file" id="file" name="myfile" />
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<input type="button" onclick="UpladFile()" value="上传" />
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<input type="button" onclick="cancleUploadFile()" value="取消" />
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</body>
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</html> |