先上代碼，寫的jsp頁(yè)面，后臺(tái)是tomcat服務(wù)器，所以頁(yè)面里有一些java的代碼，如果后臺(tái)用其他語(yǔ)言可以無(wú)視：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@page import="java.io.*"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>上傳、下載文件</title>
<style type="text/css">
#filedrag {
display: none;
font-weight: bold;
text-align: center;
padding: 1em 0;
margin: 1em 0;
color: #555;
border: 2px dashed #555;
border-radius: 7px;
cursor: default;
}
#filedrag.hover {
color: #f00;
border-color: #f00;
border-style: solid;
box-shadow: inset 0 3px 4px #888;
}
</style>
</head>
<body>
<form id="upload" action="UploadServlet" enctype="multipart/form-data"
method="post" onsubmit="return upLoad();">
<p>
<label for="fileselect">file name:</label><input multiple="true"
type="file" id="fileselect" name="fileselect[]" />
<div id="filedrag">或者將文件拖拽到這里</div>
<div id="submitbutton">
<input type="submit" value="提交">
</div>
</form>
<div id="messages">
</div>
<% //java代碼，顯示服務(wù)器上可以供下載的文件
File f = new File("G://defggg/");
File[] list = f.listFiles();
for (int i = 0; i < list.length; ++i) {
System.out.println(list[i].getName());
out.print("<a href='DownloadServlet?filename="
+ list[i].getName() + "'>" + list[i].getName()
+ "</a><br/>");
}
%>
<script type="text/javascript">
var upfiles = new Array();
// getElementById
function $id(id) {
return document.getElementById(id);
}
// output information
function Output(msg) {
var m = $id("messages");
m.innerHTML = msg + m.innerHTML;
}
// file drag hover
function FileDragHover(e) {
e.stopPropagation();
e.preventDefault();
e.target.className = (e.type == "dragover" ? "hover" : "");
}
// file selection
function FileSelectHandler(e) {
// cancel event and hover styling
FileDragHover(e);
// fetch FileList object
var files = e.target.files || e.dataTransfer.files;
// process all File objects
for ( var i = 0, f; f = files[i]; i++) {
ParseFile(f);
upfiles.push(f);
}
}
// output file information
function ParseFile(file) {
Output("<p>文件信息: <strong>" + file.name
+ "</strong> 類型: <strong>" + file.type
+ "</strong> 大小: <strong>" + file.size
+ "</strong> bytes</p>");
}
function upLoad() {
if (upfiles[0]) {
var xhr = new XMLHttpRequest(); //Ajax異步傳輸數(shù)據(jù)
xhr.open("POST", "UploadServlet", true);
var formData = new FormData();
for ( var i = 0, f; f = upfiles[i]; i++) {
formData.append('myfile', f);
}
xhr.send(formData);
xhr.onreadystatechange=function(e){
history.go(0); //由于這個(gè)頁(yè)面還要顯示可以下載的文件，所以需要刷新下頁(yè)面
}
return false;
}
}
// initialize
function Init() {
var fileselect = $id("fileselect"), filedrag = $id("filedrag"), submitbutton = $id("submitbutton");
// file select
fileselect.addEventListener("change", FileSelectHandler, false);
// is XHR2 available?
var xhr = new XMLHttpRequest();
if (xhr.upload) {
// file drop
filedrag.addEventListener("dragover", FileDragHover, false);
filedrag.addEventListener("dragleave", FileDragHover, false);
filedrag.addEventListener("drop", FileSelectHandler, false);
filedrag.style.display = "block";
// remove submit button
//submitbutton.style.display = "none";
}
}
// call initialization file
if (window.File && window.FileList && window.FileReader) {
Init();
}
</script>
</body>
</html>
