一个用于上传文件的servlet

时间：2024-12-14 23:05:57

1、jsp页面操作文件:

 <%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>

 <html>

   <head>

     <title>上传文件 </title>

     <link rel="stylesheet" type="text/css" href="../css/uploadfile.css">

     <link rel="stylesheet" type="text/css" href="../css/footer.css">

     <script type="text/javascript" src="../js/uploadfile.js"></script>

   </head>

   <body>

   <div class="container">

   <form action="../upLoadFileServlet" name="uploadform" enctype="multipart/form-data" method="post">

       <div class="back"><span class="cleckback" onclick="javascript:history.back()" style="padding-right: 50px;">返回上一级</span></div>

       <div class="upfile-div" align="center">

           <div class="title-div">上传文件</div>

         <table class="toggle-table">

            <tr>

                <td>上传者姓名:</td>

                <td><input type="text" id="uploadfileuser" name="uploadfileusername" class="inputname"/></td>

            </tr>

            <tr>

                <td>上&nbsp;传&nbsp;时&nbsp;间:</td>

                <td><input type="datetime-local" class="inputtime"></td>

            </tr>

            <tr>

                <td>选择上传文件:</td>

                <td><input type="file" name="uploadfile" class="seclectedfile"/></td>

            </tr>

            </table>

            <div class="toggle-btns">

                <input type="submit" value="上传" class="mybtn"/>

                <input type="button" value="取消" class="mybtn" onclick="uploadUserCheck()"/>

            </div>

     </div>

     </form>

   </div>

   <div class="footer"><jsp:include page="footer.jsp"></jsp:include></div>

   </body>

 </html>

2、uploadresult.jsp：

 <%@ page language="java" import="java.util.*" contentType="text/html; charset=gb2312"%>

 <%

 String path = request.getContextPath();

 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

 %>

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

 <html>

   <head>

     <base href="<%=basePath%>">

     <title>My JSP 'uploadresult.jsp' starting page</title>

     <meta http-equiv="pragma" content="no-cache">

     <meta http-equiv="cache-control" content="no-cache">

     <meta http-equiv="expires" content="0">

     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

     <meta http-equiv="description" content="This is my page">

     <!--

     <link rel="stylesheet" type="text/css" href="styles.css">

     -->

   </head>

   <body>

   <p>121312313132123132</p>

     <%

         String msg = (String)request.getAttribute("upload.message");

         if (msg != null)

         {

             %>

                 <%= msg %>

             <%

         }

      %>

   </body>

 </html>

3、servlet:

 package web.servlet;

 import java.io.File;

 import java.io.IOException;

 import java.util.Iterator;

 import java.util.List;

 import javax.servlet.ServletException;

 import javax.servlet.http.HttpServlet;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import org.apache.commons.fileupload.FileItem;

 import org.apache.commons.fileupload.disk.DiskFileItemFactory;

 import org.apache.commons.fileupload.servlet.ServletFileUpload;

 @SuppressWarnings("serial")

 public class UpLoadFileServlet extends HttpServlet {

     private int cachesize = 1024 * 1024;

     public void doGet(HttpServletRequest request, HttpServletResponse response)

             throws ServletException, IOException {

         this.doPost(request, response);

     }

     public void doPost(HttpServletRequest request, HttpServletResponse response)

             throws ServletException, IOException {

         response.setCharacterEncoding("gb2312");

         response.setContentType("text/html;charset=gb2312");

         request.setCharacterEncoding("gb2312");

         String uploadfileUserName = request.getParameter("uploadfileusername");

 //        System.out.println(uploadfileUserName);

         DiskFileItemFactory factory = new DiskFileItemFactory();

         factory.setRepository(new File("e:/tmp/"));//设置文件缓存路径

         factory.setSizeThreshold(cachesize);  //设置文件上传的上限，-1表示无上限

         ServletFileUpload upload = new ServletFileUpload(factory);

         if (!ServletFileUpload.isMultipartContent(request)){

             return;

         }

         try {

             @SuppressWarnings("unchecked")

             List<FileItem> items = upload.parseRequest(request);//上传文件并解析出所有字段

             Iterator<FileItem> iter = items.iterator();

             while(iter.hasNext())

             {

                 FileItem item = iter.next();

                 if (item.isFormField())  //表单字段

                 {

                     System.out.println(item.getFieldName());

                     System.out.println(item.getString());

                 }

                 else

                 {

                     if (item.getName() != null && !item.equals(""))

                     {

                         System.out.println(item.getName());

                         File tempFile = new File(item.getName());  //获得临时文件(创建内存文件)

                         String filename = tempFile.getName();

                         File file = new File(this.getServletContext().getRealPath("/")+"AcceptedUploadFiles",filename);

 //                        OutputStream os = new FileOutputStream(file);

                         item.write(file);

                         request.setAttribute("upload.message", "成功上传文件："+filename);

                     }

                     else

                     {

                         request.setAttribute("upload.message", "请选择上传文件");

                     }

                 }

             }

         } catch (Exception e) {

             request.setAttribute("upload.message", "文件上传失败");

         }

         //dispatcher跳转其他资源

         request.getRequestDispatcher("jsp/uploadresult.jsp").forward(request,response);

     }

 }

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