HTML5拖拽文件到浏览器并实现文件上传下载功能代码

elect = $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>

附上后台处理上传下载的servlet，用了smartUpLoad，不能很好的解决中文问题：

复制代码代码如下:
package com.hit.software;
import java.io.IOException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.jspsmart.upload.Files;
import com.jspsmart.upload.SmartUpload;
/**
* Servlet implementation class UploadServlet
*/
@WebServlet("/UploadServlet")
public class UploadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private ServletConfig config;
final public void init(ServletConfig config) throws ServletException {
this.config = config;
}
/**
* @see HttpServlet#HttpServlet()
*/
public UploadServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
// String s = request.getParameter("pic");
// System.out.println(s);
SmartUpload mySmartUpload = new SmartUpload();
try {
mySmartUpload.initialize(config, request, response);
mySmartUpload.setMaxFileSize(150 * 1024 * 1024);
mySmartUpload.setTotalMaxFileSize(150 * 1024 * 1024);
// mySmartUpload.setAllowedFilesList("doc,txt,rar,pdf,png");
mySmartUpload.setDeniedFilesList("exe");
mySmartUpload.upload();
Files f = mySmartUpload.getFiles();
int size = f.getCount();
for (int i = 0; i < size; ++i) {
String fileName = mySmartUpload.getFiles().getFile(i)
.getFileName();
fileName = new String(fileName.trim().getBytes(), "UTF-8"); //能解决部分中文问题
System.out.println("filename=" + fileName);
if (!fileName.equals("")) {
String path = "g:/defggg/" + fileName;
f.getFile(i).saveAs(path, SmartUpload.SAVE_PHYSICAL);
}
}
} catch (Exception e) {
e.printStackTrace();
System.out.println("Unable to upload the file.");
Syste