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servlet 通过 FileItem 实现多文件上传

2024-07-14 22:29:59   225人阅读

【本文简介】

一个servlet 多文件上传的简单例子。

 

【依赖包】

  1. commons-fileupload-1.3.1.jar
  2. commons-io-2.2.jar

【依赖包下载】

  1. commons-fileupload-1.3.1.jar：http://commons.apache.org/proper/commons-fileupload/download_fileupload.cgi
  2. commons-io-2.2.jar：http://commons.apache.org/proper/commons-io/download_io.cgi

 

【文件夹结构】

 

【HTML表单】

1   <body>2     <form action="UploadServlet" method="post" enctype="multipart/form-data">3         <input name="file" type="file" />4         <input name="file" type="file" />5         <input type="submit" value="上传"/>6     </form>7   </body>

 

【java代码】

 1 package com.zjm.www.servlet; 2  3 import java.io.File; 4 import java.io.IOException; 5 import java.io.PrintWriter; 6 import java.util.Iterator; 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.FileItemFactory;15 import org.apache.commons.fileupload.disk.DiskFileItemFactory;16 import org.apache.commons.fileupload.servlet.ServletFileUpload;17  18 /**19   * @描述 servlet 通过 FileItem 实现多文件上传20   * @作者   小M21   * @博客 http://www.cnblogs.com/xiaoMzjm/22   * @时间 2014/07/3023   */24 public class UploadServlet extends HttpServlet {25  26     private static final long serialVersionUID = 1L;27  28     public void doGet(HttpServletRequest request, HttpServletResponse response)29             throws ServletException, IOException {30         doPost(request, response);31     }32  33     @SuppressWarnings("unchecked")34     public void doPost(HttpServletRequest request, HttpServletResponse response)35             throws ServletException, IOException {36          37         // 转码，建议使用过滤器转码38         request.setCharacterEncoding("utf-8");39         response.setCharacterEncoding("utf-8");40         response.setContentType("text/html;charset=utf-8");41  42         // 判断提交过来的表单是否为文件上传菜单，只适用于servlet43         boolean isMultipart = ServletFileUpload.isMultipartContent(request);44          45         if (isMultipart) {46             // 构造一个文件上传处理对象47             FileItemFactory factory = new DiskFileItemFactory();48             ServletFileUpload upload = new ServletFileUpload(factory);49  50             Iterator<FileItem> items;51              52             try {53                 // 解析表单中提交的所有文件内容54                 items = upload.parseRequest(request).iterator();55                  56                 while (items.hasNext()) {57                      58                     FileItem item = (FileItem) items.next();59                      60                     if (!item.isFormField()) {61                          62                         // 取出上传文件的文件名称63                         String name = item.getName();64                         65                         // 取得上传文件以后的存储路径 66                         String fileName = name.substring(67                                 name.lastIndexOf(‘\\‘) + 1, name.length());68                         69                         // 上传文件以后的存储路径 ， 有关路径问题，请参考另一篇博文：http://www.cnblogs.com/xiaoMzjm/p/3878758.html70                         String path = request.getServletContext().getRealPath("/")+"\\UpLoadFile"71                                 + File.separatorChar + fileName;72  73                         // 上传文件74                         File uploaderFile = new File(path);75                         item.write(uploaderFile);76                          77                         // 打印上传成功信息78                         PrintWriter out = response.getWriter();79                         out.print("success");80                     }81                 }82             } catch (Exception e) {83                 e.printStackTrace();84             }85         }86     }87 }

 


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