利用Commons组件上传文件

这段代码是之前做项目时写的，怕以后用到，先贴上来保存一下
使用之前要先加载commons-fileupload-1.2.jar

/* 

 * @(#)UsersManagerBean 

 * 

 * Copyright 2008 School of Software, Yunnan University. 

 *                                   All rights reserved 

 */ 

package user; 



import java.io.File; 

import java.io.IOException; 

import java.io.PrintWriter; 

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.FileUploadException; 

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

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


/** 

 * 文件上传 

 * @version 1.0.0.0 2008-5-18 

 * @author meteorWJ 

 */ 

public class FileUploadServlet extends HttpServlet { 


    /** 

     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods. 

     * @param request servlet request 

     * @param response servlet response 

     */ 

    // 定义文件的上传路径 

    private String uploadPath = "E://upload//"; 


// 限制文件的上传大小 

    private int maxPostSize = 100 * 1024 * 1024; 


    public FileUploadServlet() { 

        super(); 

    } 


    public void destroy() { 

        super.destroy(); 

    } 


    protected void processRequest(HttpServletRequest request, HttpServletResponse response) 

            throws ServletException, IOException { 

        System.out.println("Access !"); 

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

        PrintWriter out = response.getWriter(); 



//保存文件到服务器中 

        DiskFileItemFactory factory = new DiskFileItemFactory(); 

        factory.setSizeThreshold(4096); 

        ServletFileUpload upload = new ServletFileUpload(factory); 

        upload.setSizeMax(maxPostSize); 

        try { 

            List fileItems = upload.parseRequest(request); 

            Iterator iter = fileItems.iterator(); 

            while (iter.hasNext()) { 

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

                if (!item.isFormField()) { 

                    String name = item.getName(); 

                    System.out.println(name); 

                    try { 

                        item.write(new File(uploadPath + name)); 

                    } catch (Exception e) { 

                        e.printStackTrace(); 

                    } 

                } 

            } 

        } catch (FileUploadException e) { 

            e.printStackTrace(); 

            System.out.println(e.getMessage() + "结束"); 

        } 

    } 


}