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1、jsp页面操作文件:
1 <%@ page language="java" import="java.util.*" pageEncoding="gb2312"%> 2 <html> 3 <head> 4 <title>上传文件 </title> 5 <link rel="stylesheet" type="text/css" href="../css/uploadfile.css"> 6 <link rel="stylesheet" type="text/css" href="../css/footer.css"> 7 <script type="text/javascript" src="../js/uploadfile.js"></script> 8 </head> 9 <body> 10 <div class="container"> 11 <form action="../upLoadFileServlet" name="uploadform" enctype="multipart/form-data" method="post"> 12 <div class="back"><span class="cleckback" onclick="javascript:history.back()" style="padding-right: 50px;">返回上一级</span></div> 13 <div class="upfile-div" align="center"> 14 <div class="title-div">上传文件</div> 15 <table class="toggle-table"> 16 <tr> 17 <td>上传者姓名:</td> 18 <td><input type="text" id="uploadfileuser" name="uploadfileusername" class="inputname"/></td> 19 </tr> 20 <tr> 21 <td>上 传 时 间:</td> 22 <td><input type="datetime-local" class="inputtime"></td> 23 </tr> 24 <tr> 25 <td>选择上传文件:</td> 26 <td><input type="file" name="uploadfile" class="seclectedfile"/></td> 27 </tr> 28 </table> 29 <div class="toggle-btns"> 30 <input type="submit" value="上传" class="mybtn"/> 31 <input type="button" value="取消" class="mybtn" onclick="uploadUserCheck()"/> 32 </div> 33 </div> 34 </form> 35 </div> 36 <div class="footer"><jsp:include page="footer.jsp"></jsp:include></div> 37 </body> 38 </html>
2、uploadresult.jsp：
1 <%@ page language="java" import="java.util.*" contentType="text/html; charset=gb2312"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 8 <html> 9 <head> 10 <base href="<%=basePath%>"> 11 12 <title>My JSP ‘uploadresult.jsp‘ starting page</title> 13 14 <meta http-equiv="pragma" content="no-cache"> 15 <meta http-equiv="cache-control" content="no-cache"> 16 <meta http-equiv="expires" content="0"> 17 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 18 <meta http-equiv="description" content="This is my page"> 19 <!-- 20 <link rel="stylesheet" type="text/css" href="styles.css"> 21 --> 22 23 </head> 24 25 <body> 26 <p>121312313132123132</p> 27 <% 28 String msg = (String)request.getAttribute("upload.message"); 29 if (msg != null) 30 { 31 %> 32 <%= msg %> 33 <% 34 } 35 %> 36 </body> 37 </html>
3、servlet:
1 package web.servlet; 2 3 import java.io.File; 4 import java.io.IOException; 5 import java.util.Iterator; 6 import java.util.List; 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.apache.commons.fileupload.FileItem; 14 import org.apache.commons.fileupload.disk.DiskFileItemFactory; 15 import org.apache.commons.fileupload.servlet.ServletFileUpload; 16 17 @SuppressWarnings("serial") 18 public class UpLoadFileServlet extends HttpServlet { 19 20 private int cachesize = 1024 * 1024; 21 22 public void doGet(HttpServletRequest request, HttpServletResponse response) 23 throws ServletException, IOException { 24 25 this.doPost(request, response); 26 } 27 28 public void doPost(HttpServletRequest request, HttpServletResponse response) 29 throws ServletException, IOException { 30 31 response.setCharacterEncoding("gb2312"); 32 response.setContentType("text/html;charset=gb2312"); 33 request.setCharacterEncoding("gb2312"); 34 String uploadfileUserName = request.getParameter("uploadfileusername"); 35 36 // System.out.println(uploadfileUserName); 37 38 DiskFileItemFactory factory = new DiskFileItemFactory(); 39 factory.setRepository(new File("e:/tmp/"));//设置文件缓存路径 40 factory.setSizeThreshold(cachesize); //设置文件上传的上限，-1表示无上限 41 ServletFileUpload upload = new ServletFileUpload(factory); 42 if (!ServletFileUpload.isMultipartContent(request)){ 43 return; 44 } 45 try { 46 47 @SuppressWarnings("unchecked") 48 List<FileItem> items = upload.parseRequest(request);//上传文件并解析出所有字段 49 Iterator<FileItem> iter = items.iterator(); 50 while(iter.hasNext()) 51 { 52 FileItem item = iter.next(); 53 if (item.isFormField()) //表单字段 54 { 55 System.out.println(item.getFieldName()); 56 System.out.println(item.getString()); 57 } 58 else 59 { 60 if (item.getName() != null && !item.equals("")) 61 { 62 System.out.println(item.getName()); 63 64 File tempFile = new File(item.getName()); //获得临时文件(创建内存文件) 65 String filename = tempFile.getName(); 66 67 File file = new File(this.getServletContext().getRealPath("/")+"AcceptedUploadFiles",filename); 68 // OutputStream os = new FileOutputStream(file); 69 item.write(file); 70 request.setAttribute("upload.message", "成功上传文件："+filename); 71 } 72 else 73 { 74 request.setAttribute("upload.message", "请选择上传文件"); 75 } 76 77 } 78 } 79 } catch (Exception e) { 80 request.setAttribute("upload.message", "文件上传失败"); 81 } 82 //dispatcher跳转其他资源 83 request.getRequestDispatcher("jsp/uploadresult.jsp").forward(request,response); 84 } 85 86 }
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原文地址：http://www.cnblogs.com/0519xf/p/4782424.html
