主要介绍使用 smartupload.jar 包中的方法对文件的上传和下载。上传时文件是存放在服务器中，我用的是tamcat。
首先建立一个servlet 类，对文件的操作
1 package com.dkt.servlet; 2 3 import java.io.File; 4 import java.io.IOException; 5 import java.sql.SQLException; 6 import java.util.ArrayList; 7 8 import javax.servlet.ServletException; 9 import javax.servlet.http.HttpServlet; 10 import javax.servlet.http.HttpServletRequest; 11 import javax.servlet.http.HttpServletResponse; 12 13 import org.lxh.smart.Files; 14 import org.lxh.smart.SmartUpload; 15 import org.lxh.smart.SmartUploadException; 16 17 public class FileUpdownLoad extends HttpServlet { 18 19 public void doGet(HttpServletRequest request, HttpServletResponse response) 20 throws ServletException, IOException { 21 doPost(request, response); 22 } 23 24 public void doPost(HttpServletRequest request, HttpServletResponse response) 25 throws ServletException, IOException { 26 27 response.setContentType("text/html"); 28 request.setCharacterEncoding("GB2312"); 29 response.setCharacterEncoding("GB2312"); 30 SmartUpload su = new SmartUpload(); 31 32 String op = request.getParameter("op"); 33 if (("upload").equals(op)) { 34 su.initialize(getServletConfig(), request, response);//初始化 35 su.setAllowedFilesList("txt,jpg,png,docx,xml,PNG,xlsx");//允许上传的文件类型，区分大小写 36 try { 37 su.setDeniedFilesList("html,exe");//不允许上传的文件类型 38 } catch (SQLException e) { 39 e.printStackTrace(); 40 } 41 su.setMaxFileSize(5000000);//文件大小 42 43 /*Files files = su.getFiles(); 44 org.lxh.smart.File file2 = files.getFile(0); 45 System.out.println(file2.getFileName()); 46 for(int i=0;i<files.getCount();i++){ 47 org.lxh.smart.File file = files.getFile(i); 48 String fileName = file.getFileName(); 49 System.out.println("fileName---->"+fileName); 50 fileName = new String(fileName.getBytes("ISO-8859-1"),"GB2312"); 51 try { 52 file.saveAs(fileName); 53 } catch (SmartUploadException e) { 54 e.printStackTrace(); 55 } 56 }*/ 57 try { 58 su.upload();//上传 59 su.save("/smartUpdownload");//上传的路径，在tomcat下的文件夹中 60 System.out.println("上传成功！！！"); 61 } catch (SmartUploadException e) { 62 e.printStackTrace(); 63 } 64 request.getRequestDispatcher("fileUpDownload.jsp").forward(request, response); 65 }else if(("showFiles").equals(op)){ 66 //得到上传到服务器的文件夹 67 String realPath = this.getServletContext().getRealPath("smartUpdownload"); 68 //得到所有文件的文件名，并显示在页面上 69 File file = new File(realPath); 70 File[] listFiles = file.listFiles(); 71 ArrayList<String> list = new ArrayList<String>(); 72 for (File fi : listFiles) { 73 list.add(fi.getName());//把所有的文件名存入集合 74 } 75 request.setAttribute("list", list); 76 request.getRequestDispatcher("fileUpDownload.jsp").forward(request, response); 77 }else if(("download").equals(op)){ 78 su.initialize(getServletConfig(), request, response);//初始化 79 su.setContentDisposition(null); 80 String filename1 = request.getParameter("filename"); 81 String filename = new String(filename1.getBytes("ISO-8859-1"), "GB2312"); 82 System.out.println(filename); 83 try { 84 su.downloadFile("/smartUpdownload/"+filename); 85 } catch (SmartUploadException e) { 86 e.printStackTrace(); 87 } 88 } 89 90 91 92 93 } 94 95 }
jsp 内容如下:
这里使用到了 c 标签，所以需要两个jar包 jstl.jar 和 standard-1.1.2.jar
并使用
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> 导入包
1 <%@ page language="java" import="java.util.*" pageEncoding="gb2312"%> 2 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> 3 <%@page import="org.lxh.smart.SmartUpload"%> 4 <%@page import="org.lxh.smart.File"%> 5 <% 6 String path = request.getContextPath(); 7 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 8 %> 9 10 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 11 <html> 12 <head> 13 <base href="<%=basePath%>"> 14 15 <title>My JSP 'fileUpDownload.jsp' starting page</title> 16 17 <meta http-equiv="pragma" content="no-cache"> 18 <meta http-equiv="cache-control" content="no-cache"> 19 <meta http-equiv="expires" content="0"> 20 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 21 <meta http-equiv="description" content="This is my page"> 22 <!-- 23 <link rel="stylesheet" type="text/css" href="styles.css"> 24 --> 25 26 </head> 27 28 <body> 29 <form action="FileUpdownLoad?op=upload" method="post" enctype="multipart/form-data" > 30 <input type="file" name="file1" value="上传的文件"> 31 <input type="submit" value="上传"> 32 </form> 33 <hr/> 34 <a href = "FileUpdownLoad?op=showFiles">显示下载的文件目录</a><br/> 35 <c:forEach items="${list}" var="filename"> 36 <a href="FileUpdownLoad?op=download&filename=${filename }">下载文件：${filename }</a><br/> 37 </c:forEach> 38 39 <a href="ImageServlet">显示水印图片</a> 40 </body> 41 </html>
