標籤：ajax;jsp;上傳;jquery;非同步;
最近的項目開發中，遇到了一個多檔案上傳的問題，即在不重新整理頁面的情況下，上傳多個檔案至伺服器。現總結分享如下：
本文主要採用了基於jsp的ajax，jquery，servlet等技術。
1.upload.jsp
點擊上傳時，調用對應的fileupload函數，通過ajax將檔案非同步傳送到servlet中處理。注意在檔案上傳時，所使用的編碼類別型應當是“multipart/form-data”，它既可以發送文本資料，也支援位元據上傳。
<%@ 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("上傳檔案不可為空!"); return false; } var file = $("#locationphoto").val(); var pos=file.lastIndexOf("\\");var fileName=file.substring(pos+1);//獲得檔案名稱字 $.ajaxFileUpload({ url:"PictureServlet";, contentType:"multipart/form-data; text/xml;charset=utf-8", secureuri:false, cache: false,//防止緩衝 fileElementId:‘locationphoto‘, dataType: ‘text/xml‘, success: function (data) { document.getElementById("locationspan").innerHTML = fileName; alert(fileName); },error: function (data, status, e){ alert("fail"); } } ); } function fileupload2(){ if($("#buildingphoto").val()==""){ alert("上傳檔案不可為空!"); return false; } var file = $("#buildingphoto").val(); var pos=file.lastIndexOf("\\"); var fileName=file.substring(pos+1); buildph++; $.ajaxFileUpload({ url:"PictureServlet";, contentType:"multipart/form-data; text/xml;charset=utf-8", secureuri:false, cache: false,//防止緩衝 fileElementId:‘buildingphoto‘, dataType: ‘text/xml‘, success: function (data) { document.getElementById("buildingspan"+buildph).innerHTML = fileName; alert(fileName); },error: function (data, status, e){ alert("fail"); } } ); } function fileupload3(){ if($("#typePhoto").val()==""){ alert("上傳檔案不可為空!"); return false; } var file = $("#typePhoto").val(); var pos=file.lastIndexOf("\\"); var fileName=file.substring(pos+1); typeph++; $.ajaxFileUpload({ url:"PictureServlet";, contentType:"multipart/form-data; text/xml;charset=utf-8", secureuri:false, cache: false,//防止緩衝 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
通過該servlet接受jsp上傳的資料流，儲存到相應路徑，並解析出檔案名稱。
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/";//檔案上傳的路徑，實際開發中一般用相對路徑 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");//解決漢字亂碼問題 int j = filename.lastIndexOf("\""); int s = filename.indexOf("filename"); name=filename.substring(s+10,j); filename = name;//通過上述處理可以得到上傳的檔案名稱 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(); }}
注意相關jar包的引入，見附件。
本文出自 “java我的最愛” 部落格，請務必保留此出處http://lindianli.blog.51cto.com/7129432/1409559
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