文件上传与下载

最新推荐文章于 2024-09-02 16:10:56 发布

moneyZhong

最新推荐文章于 2024-09-02 16:10:56 发布

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分类专栏： javaWeb开发实用案例文章标签： smartUpload 文件上传下载文件下载时设置文件名称

本文链接：https://blog.youkuaiyun.com/moneyzhong/article/details/8839240

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文件上传：

public class UploadServlet extends HttpServlet{
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		doPost(req, resp);
	}
	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		SmartUpload myupload = new SmartUpload();
		ServletConfig config = getServletConfig();
		myupload.initialize(config,req,resp);
		resp.setContentType("text/html");
		resp.setCharacterEncoding("utf-8");
		PrintWriter out = resp.getWriter();
		out.println("<h2>处理上传的文件</h2>");
		out.println("<hr>");
		
		try {
			myupload.setMaxFileSize(1024*1024);
			myupload.setTotalMaxFileSize(5*1024*1024);
			
			myupload.setAllowedFilesList("doc,txt,jpg,gif");
			myupload.setDeniedFilesList("exe,bat,jsp,htm,html");
			myupload.upload();//上传文件，此项是必须的
			int count = myupload.getFiles().getCount();
			Request myRequest = myupload.getRequest();
			String rndFilename,fileExtName,fileName,filePathName;
			Date dt = null;
			SimpleDateFormat fmt = new SimpleDateFormat("yyyyMMdd");
			//一一提取上传文件信息，同时可保持文件
			for(int i = 0; i < count; i++){
				File file = myupload.getFiles().getFile(i);
				if(file.isMissing())
					continue;
				fileName = new String(file.getFileName().getBytes(),"utf-8");//获取文件名
				filePathName = new String(file.getFilePathName().getBytes(),"utf-8");
				fileExtName = file.getFileExt();
				dt = new Date(System.currentTimeMillis());
				Thread.sleep(100);
				rndFilename = fmt.format(dt)+i+"."+fileExtName;
				out.println("第"+(i+1)+"个文件的文件信息：<br>");
				out.println("   文件名为："+fileName+"<br>");
				out.println("   文件扩展名为："+fileExtName+"<br>");
				out.println("   文件全名："+filePathName+"<br>");
				out.println("   文件大小："+file.getSize()/1024+"kb<br>");
				//创建文件保存位置
				ServletContext context = req.getServletContext();
				String savePath = context.getRealPath("/upload/");
				java.io.File folder = new java.io.File(savePath);
				if(!folder.exists()){
					folder.mkdirs();
				}
				out.println("   文件保存路径："+savePath);
				file.saveAs(savePath+"/"+rndFilename,SmartUpload.SAVE_PHYSICAL);
			}
			
		} catch (Exception e) {
			out.println("文件上传失败！！！！");
			e.printStackTrace();
		}
		out.flush();
		out.close();
		
	}
}

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ page import="com.jspsmart.upload.*" %>
<%
	//设定请求编码方式，否则遇到中文就会乱码
	request.setCharacterEncoding("utf-8");
%>
<!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>上传文件实例</title>
<script type="text/javascript" src="js/jquery-1.8.1.js"></script>
<script type="text/javascript">
	$(function(){
		$("#number").change(function(){
			var number = $("#number").attr("value");
			$("#files").html("");
			for(var i = 0; i < number; i++){
				$("#files").append("<input type='file' name='file''"+i+"'><br/>");
			}
		});
	});
</script>
</head>

<body>
<h2>上传文件实例</h2>
请选择上传文件数量：
<select id="number">
	<option value="1" selected="selected">1</option>
	<option value="2">2</option>
	<option value="3">3</option>
	<option value="4">4</option>
	<option value="5">5</option>
</select>
<form action="UploadServlet" method="post" enctype="multipart/form-data">
	<div id="files"></div>
	<input type="submit" value="提交"/>
</form>
</body>
</html>

文件下载：

<%
  response.setContentType("application/x-download");//设置为下载application/x-download
  String filedownload = "/要下载的文件名";//即将下载的文件的相对路径
  String filedisplay = "最终要显示给用户的保存文件名";//下载文件时显示的文件保存名称
  String filenamedisplay = URLEncoder.encode(filedisplay,"UTF-8");
  response.addHeader("Content-Disposition","attachment;filename=" + filedisplay);
   
  try
  {
  RequestDispatcher dis = application.getRequestDispatcher(filedownload);
  if(dis!= null)
  {
  dis.forward(request,response);
  }
  response.flushBuffer();
  }
  catch(Exception e)
  {
  e.printStackTrace();
  }
  finally
  {
   
  }
%>