標籤：ansi saveas protect 操作 parameter input exception 時間戳記 htm
檔案上傳在web應用中是非常常見的，現在我就介紹下基於servlet的檔案上傳，基於Struts2的檔案上傳可以看：
頁面端代碼：
<%@ page language="java" import="java.util.*" pageEncoding="GBK"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><title>註冊</title></head><body> <form name="form1" onsubmit="return on_submit()" action="RegisterServlet" method="post" enctype="multipart/form-data"> <input type="text" name="uname1" id="password" /> <input type="text" name="uname2" id="uname2"/> <input type="password" name="password1" id="password" /> <input type="password" name="password2" id="password"/> <input type="radio" value="男" checked="checked" name="sex"/>男 <input type="radio" value="女" name="sex"/>女 <input type="text" name="email" value="" class="box" id="login" /> <br/><br/> <input type="file" name="file1" id="file"/> <input type="submit" name="submit" value="完成註冊" /> </form></body></html>
這裡要注意的一點就是存在檔案上傳的form表單必須封裝為enctype="multipart/form-data"；這裡我們直接與後台進行互動，不進行Ajax互動，需要使用ajax可以看：
http://www.cnblogs.com/shenliang123/category/372520.html
下面我們繼續來看servlet的代碼實現：
package com.xidian.bbs.servlet;import java.io.IOException;import java.io.PrintWriter;import java.net.InetAddress;import java.sql.Connection;import java.sql.ResultSet;import java.sql.Statement;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.jsp.JspFactory;import javax.servlet.jsp.PageContext;import com.jspsmart.upload.*;import com.xidian.bbs.bean.Bean;import com.xidian.bbs.bean.RegisterBean;import com.xidian.bbs.util.DBAccess;import com.xidian.bbs.util.IpTimeStamp;@SuppressWarnings("serial")public class RegisterServlet extends HttpServlet{ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); response.setCharacterEncoding("GBK"); request.setCharacterEncoding("GBK"); SmartUpload smart=new SmartUpload(); try{ //PageContext是jsp的內建對象，在servlet不能直接使用，需要做一些處理 JspFactory _jspxFactory = null; PageContext pageContext = null; _jspxFactory = JspFactory.getDefaultFactory(); pageContext = _jspxFactory.getPageContext(this,request,response,"",true,8192,true); smart.initialize(pageContext);//初始化上傳操作 smart.upload(); IpTimeStamp its=new IpTimeStamp(InetAddress.getLocalHost().getHostAddress());//request.getRemoteAddr()獲得使用者的ip地址 //System.out.println("擷取的ip為"+InetAddress.getLocalHost().getHostAddress()); //如果要實現檔案的批量上傳，則只需用for迴圈，將getFile(0)中的0改為i即可 String ext=smart.getFiles().getFile(0).getFileExt();//此為得到檔案的副檔名,getFile(0)為得到唯一的一個上傳檔案 String fileName=its.getIpTimeRand()+"."+ext; //System.out.println("擷取 的檔案名稱為"+fileName); //this.getServletContext().getRealPath("/")為得到tomcat的跟目錄，放於upload檔案夾中，java.io.File.separator是一種安全操作 //String realPath=""; //this.getServletContext().getRealPath("/")+ smart.getFiles().getFile(0).saveAs("/headupload"+java.io.File.separator+fileName); String realPath="headupload/"+fileName+""; // //由於前面的form表單已經進行了封裝，這裡就不能簡單的用request.getparameter()來擷取表單參數 String uname1 = smart.getRequest().getParameter("uname1");//暱稱 String upass1 = smart.getRequest().getParameter("password1"); String sex = smart.getRequest().getParameter("sex"); String uname2 = smart.getRequest().getParameter("uname2");//使用者名稱 String email = smart.getRequest().getParameter("email"); PrintWriter out = response.getWriter(); //以下是持久層操作，省略。。。。。。。。。。 } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request,response); }}
上面使用到的ip+時間戳記的類IpTimeStamp對檔案進行重新命名：http://www.cnblogs.com/shenliang123/archive/2012/04/19/2456645.html
基於Servlet+smartUpload的檔案上傳
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