本篇内容主要讲解“HTML5拖拽文件到浏览器并实现文件上传下载功能”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“HTML5拖拽文件到浏览器并实现文件上传下载功能”吧!

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先上代码，写的jsp页面，后台是tomcat服务器，所以页面里有一些java的代码，如果后台用其他语言可以无视：

代码如下:

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@page import="java.io.*"%>

method="post" onsubmit="return upLoad();">

file name:type="file" id="fileselect" name="fileselect[]" />

或者将文件拖拽到这里

<% //java代码，显示服务器上可以供下载的文件
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("+ list[i].getName() + "'>" + list[i].getName()
+ "
");
}
%>

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：

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.");
System.out.println("Error :" + e.toString());
}
response.sendRedirect("index.jsp");
}
}

代码如下:

package com.hit.software;
import java.io.File;
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 javax.servlet.jsp.JspFactory;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.PageContext;
import com.jspsmart.upload.SmartUpload;
import com.jspsmart.upload.SmartUploadException;
/**
* Servlet implementation class DownloadServlet
*/
@WebServlet("/DownloadServlet")
public class DownloadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private ServletConfig config;
/**
* @see HttpServlet#HttpServlet()
*/
public DownloadServlet() {
super();
// TODO Auto-generated constructor stub
}
final public void init(ServletConfig config) throws ServletException {
this.config = config;
}
/**
* @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 fileName = request.getParameter("filename");
System.out.println("down :"+fileName);
if (fileName == null) {
response.sendRedirect("index.jsp");
return;
}
fileName = "G://defggg//" + fileName;
File f = new File(fileName);
if (f.exists() && f.isFile()) {
SmartUpload su = new SmartUpload();
su.initialize(config, request, response);
su.setContentDisposition(null);
try {
su.downloadFile(fileName);
} catch (SmartUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} else {
response.sendRedirect("index.jsp");
return;
}
}
}

到此，相信大家对“HTML5拖拽文件到浏览器并实现文件上传下载功能”有了更深的了解，不妨来实际操作一番吧！这里是创新互联网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！

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