最近的项目开发中，遇到了一个多文件上传的问题，即在不刷新页面的情况下，上传多个文件至服务器。现总结分享如下：
本文主要采用了基于jsp的ajax，jquery，servlet等技术。
1.upload.jsp
点击上传时，调用对应的fileupload函数，通过ajax将文件异步传送到servlet中处理。注意在文件上载时，所使用的编码类型应当是“multipart/form-data”，它既可以发送文本数据，也支持二进制数据上载。
<%@ 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("上传文件不能为空!");
return false;
}
var file = $("#locationphoto").val();
var pos=file.lastIndexOf("\\");
var fileName=file.substring(pos+1);//获得文件名字
$.ajaxFileUpload({
url:"PictureServlet";,
contentType:"multipart/form-data; text/xml;charset=utf-8",
secureuri:false,
cache: false,//防止缓存
fileElementId:'locationphoto',
dataType: 'text/xml',
success: function (data) {
document.getElementById("locationspan").innerHTML = fileName;
alert(fileName);
},error: function (data, status, e){
alert("fail");
}
}
);
}
function fileupload2(){
if($("#buildingphoto").val()==""){
alert("上传文件不能为空!");
return false;
}
var file = $("#buildingphoto").val();
var pos=file.lastIndexOf("\\");
var fileName=file.substring(pos+1);
buildph++;
$.ajaxFileUpload({
url:"PictureServlet";,
contentType:"multipart/form-data; text/xml;charset=utf-8",
secureuri:false,
cache: false,//防止缓存
fileElementId:'buildingphoto',
dataType: 'text/xml',
success: function (data) {
document.getElementById("buildingspan"+buildph).innerHTML = fileName;
alert(fileName);
},error: function (data, status, e){
alert("fail");
}
}
);
}
function fileupload3(){
if($("#typePhoto").val()==""){
alert("上传文件不能为空!");
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,//防止缓存
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">楼盘位置图：
<span id="locationspan" ></span>
<input type="file" name="locationphoto" id="locationphoto" value="this.val()"/>
<input type="button" name="fileLoad1" id="fileLoad1" value="上传" onClick="fileupload1()"/>
</td>
</tr>
<tr>
<td height="30" colspan="2">楼盘照片：
<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="上传" onClick="fileupload2()"/>
</td>
</tr>
<tr>
<td height="30" colspan="2">楼盘户型图：
<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="上传" onClick="fileupload3()"/>
</td>
</tr>
</table>
</form>
</body>
</html>
2.PictureServlet.java
通过该servlet接受jsp上传的数据流，存储到相应路径，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/";//文件上传的路径，实际开发中一般用相对路径
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");//解决汉字乱码问题
int j = filename.lastIndexOf("\"");
int s = filename.indexOf("filename");
name=filename.substring(s+10,j);
filename = name;//通过上述处理可以得到上传的文件名
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); // 写入
}
}
fileStream.close();
}
PrintWriter out=response.getWriter();
String result = filename ;
out.print(result);
out.close();
in.close();
}
}
注意相关jar包的引入，见附件。
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