servlet 通过 FileItem 实现多文件上传

【本文简介】

一个servlet 多文件上传的简单例子。

【依赖包】

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

【依赖包下载】

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

【文件夹结构】

【HTML表单】

   <body>

     <form action="UploadServlet" method="post" enctype="multipart/form-data">

         <input name="file" type="file" />

         <input name="file" type="file" />

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

     </form>

   </body>

【java代码】

 package com.zjm.www.servlet;

 import java.io.File;

 import java.io.IOException;

 import java.io.PrintWriter;

 import java.util.Iterator;

 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.FileItemFactory;

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

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

 /**

   * @描述 servlet 通过 FileItem 实现多文件上传

   * @作者   小M

   * @博客 http://www.cnblogs.com/xiaoMzjm/

   * @时间 2014/07/30

   */

 public class UploadServlet extends HttpServlet {

     private static final long serialVersionUID = 1L;

     public void doGet(HttpServletRequest request, HttpServletResponse response)

             throws ServletException, IOException {

         doPost(request, response);

     }

     @SuppressWarnings("unchecked")

     public void doPost(HttpServletRequest request, HttpServletResponse response)

             throws ServletException, IOException {

         // 转码，建议使用过滤器转码

         request.setCharacterEncoding("utf-8");

         response.setCharacterEncoding("utf-8");

         response.setContentType("text/html;charset=utf-8");

         // 判断提交过来的表单是否为文件上传菜单，只适用于servlet

         boolean isMultipart = ServletFileUpload.isMultipartContent(request);

         if (isMultipart) {

             // 构造一个文件上传处理对象

             FileItemFactory factory = new DiskFileItemFactory();

             ServletFileUpload upload = new ServletFileUpload(factory);

             Iterator<FileItem> items;

             try {

                 // 解析表单中提交的所有文件内容

                 items = upload.parseRequest(request).iterator();

                 while (items.hasNext()) {

                     FileItem item = (FileItem) items.next();

                     if (!item.isFormField()) {

                         // 取出上传文件的文件名称

                         String name = item.getName();

                         // 取得上传文件以后的存储路径

                         String fileName = name.substring(

                                 name.lastIndexOf('\\') + 1, name.length());

                         // 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.html

                         String path = request.getServletContext().getRealPath("/")+"\\UpLoadFile"

                                 + File.separatorChar + fileName;

                         // 上传文件

                         File uploaderFile = new File(path);

                         item.write(uploaderFile);

                         // 打印上传成功信息

                         PrintWriter out = response.getWriter();

                         out.print("success");

                     }

                 }

             } catch (Exception e) {

                 e.printStackTrace();

             }

         }

     }

 }

Commons

servlet 通过 FileItem 实现多文件上传