最近的項(xiàng)目開(kāi)發(fā)中，遇到了一個(gè)多文件上傳的問(wèn)題，即在不刷新頁(yè)面的情況下，上傳多個(gè)文件至服務(wù)器。現(xiàn)總結(jié)分享如下：
本文主要采用了基于jsp的ajax，jquery，servlet等技術(shù)。
1.upload.jsp
點(diǎn)擊上傳時(shí)，調(diào)用對(duì)應(yīng)的fileupload函數(shù)，通過(guò)ajax將文件異步傳送到servlet中處理。注意在文件上載時(shí)，所使用的編碼類型應(yīng)當(dāng)是“multipart/form-data”，它既可以發(fā)送文本數(shù)據(jù)，也支持二進(jìn)制數(shù)據(jù)上載。
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><base href="<%=basePath%>"><title>Insert title here</title><script type="text/javascript" src="js/jquery.js"></script><script type="text/javascript" src="js/ajaxfileupload.js"></script></head><script language="JavaScript" type="text/javascript"> var buildph=0; var typeph=0; var planph=0; function fileupload1(){ if($("#locationphoto").val()==""){ alert("上傳文件不能為空!"); return false; } var file = $("#locationphoto").val(); var pos=file.lastIndexOf("http://");var fileName=file.substring(pos+1);//獲得文件名字 $.ajaxFileUpload({ url:"PictureServlet";, contentType:"multipart/form-data; text/xml;charset=utf-8", secureuri:false, cache: false,//防止緩存 fileElementId:'locationphoto', dataType: 'text/xml', success: function (data) { document.getElementById("locationspan").innerHTML = fileName; alert(fileName); },error: function (data, status, e){ alert("fail"); } } ); } function fileupload2(){ if($("#buildingphoto").val()==""){ alert("上傳文件不能為空!"); return false; } var file = $("#buildingphoto").val(); var pos=file.lastIndexOf("http://"); var fileName=file.substring(pos+1); buildph++; $.ajaxFileUpload({ url:"PictureServlet";, contentType:"multipart/form-data; text/xml;charset=utf-8", secureuri:false, cache: false,//防止緩存 fileElementId:'buildingphoto', dataType: 'text/xml', success: function (data) { document.getElementById("buildingspan"+buildph).innerHTML = fileName; alert(fileName); },error: function (data, status, e){ alert("fail"); } } ); } function fileupload3(){ if($("#typePhoto").val()==""){ alert("上傳文件不能為空!"); return false; } var file = $("#typePhoto").val(); var pos=file.lastIndexOf("http://"); var fileName=file.substring(pos+1); typeph++; $.ajaxFileUpload({ url:"PictureServlet";, contentType:"multipart/form-data; text/xml;charset=utf-8", secureuri:false, cache: false,//防止緩存 fileElementId:'typePhoto', dataType: 'text/xml', success: function (data) { document.getElementById("typespan"+typeph).innerHTML = fileName; alert(fileName); },error: function (data, status, e){ alert("fail"); } } ); }</script><body><form id="form1" name="form1" method="post" action=""> <table width="663" height="316" align="center"> <tr> <td height="30" colspan="2">樓盤位置圖： <span id="locationspan" ></span> <input type="file" name="locationphoto" id="locationphoto" value="this.val()"/> <input type="button" name="fileLoad1" id="fileLoad1" value="上傳" onClick="fileupload1()"/> </td> </tr> <tr> <td height="30" colspan="2">樓盤照片： <span id="buildingspan1" ></span> <span id="buildingspan2" ></span> <span id="buildingspan3" ></span> <span id="buildingspan4" ></span> <input type="file" name="buildingphoto" id="buildingphoto" value="this.val()"/> <input type="button" name="fileLoad2" id="fileLoad2" value="上傳" onClick="fileupload2()"/> </td> </tr> <tr> <td height="30" colspan="2">樓盤戶型圖： <span id="typespan1" ></span> <span id="typespan2" ></span> <span id="typespan3" ></span> <span id="typespan4" ></span> <input type="file" name="typePhoto" id="typePhoto" value="this.val()"/> <input type="button" name="fileLoad3" id="fileLoad3" value="上傳" onClick="fileupload3()"/> </td> </tr> </table></form></body></html>2.PictureServlet.java
通過(guò)該servlet接受jsp上傳的數(shù)據(jù)流，存儲(chǔ)到相應(yīng)路徑，并解析出文件名。
package com.servlet;import java.io.BufferedOutputStream;import java.io.DataOutputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.ServletInputStream;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.realty.base.action.BuildingAction;/** * Servlet implementation class PictureServlet */@WebServlet("/PictureServlet")public class PictureServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public PictureServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doPost(request,response); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub response.setContentType("text/xml");//是xml response.setHeader("Cache-Control", "no-cache"); response.setCharacterEncoding("UTF-8"); String filepath ="E:/pic/";//文件上傳的路徑，實(shí)際開(kāi)發(fā)中一般用相對(duì)路徑 String filename = ""; String name=""; ServletInputStream in = request.getInputStream(); byte[] buf = new byte[4048]; int len = in.readLine(buf, 0, buf.length); String f = new String(buf, 0, len - 1); while ((len = in.readLine(buf, 0, buf.length)) != -1) { filename = new String(buf, 0, len,"utf-8");//解決漢字亂碼問(wèn)題 int j = filename.lastIndexOf("/""); int s = filename.indexOf("filename"); name=filename.substring(s+10,j); filename = name;//通過(guò)上述處理可以得到上傳的文件名 System.out.println("filename="+filename); DataOutputStream fileStream = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(filepath+ filename))); len = in.readLine(buf, 0, buf.length); len = in.readLine(buf, 0, buf.length); while ((len = in.readLine(buf, 0, buf.length)) != -1) { String tempf = new String(buf, 0, len - 1); if (tempf.equals(f) || tempf.equals(f + "--")) { break; } else{ fileStream.write(buf, 0, len); // 寫入 } } fileStream.close(); } PrintWriter out=response.getWriter(); String result = filename ; out.print(result); out.close(); in.close(); }}以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持武林網(wǎng)。
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