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();
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持硕编程。
【说明】：本文章由站长整理发布，文章内容不代表本站观点，如文中有侵权行为，请与本站客服联系(QQ:254677821)！