JSP结合Ajax实现无刷新文件上传的iframe方案
作者：小满时间：2026-10-29 20:26:56浏览：109
本文介绍在JSP环境中利用iframe实现无刷新文件上传的方法。由于浏览器安全限制，JavaScript无法直接操作文件，Ajax难以动态上传文件。通过Form提交至隐藏iframe，并在处理页返回JavaScript回调，可实现页面不刷新的文件上传功能。
JSP结合Ajax实现无刷新文件上传的iframe方案
本文详细介绍了一种在JSP页面中结合Ajax技术实现文件无刷新上传的具体方法，供读者参考借鉴。
涉及的核心文件包括：列表页面selectaddress.jsp、JavaScript处理脚本ajax_edit.js、后端JSP处理页面editaddress.jsp以及文件上传工具类UploadUtil.java。
实现思路：受限于浏览器安全策略，JavaScript无法直接访问本地文件，导致原生Ajax难以动态上传文件。因此，本方案采用iframe作为载体来解决这一限制。
具体做法是将列表页的form表单提交目标指向一个隐藏的iframe，并正确配置表单属性。
关键配置如下：
设置表单的enctype属性为'multipart/form-data'，并将target属性指向隐藏的iframe名称，例如'target='hidden_frame''。当处理页面完成文件上传逻辑后，需要向父窗口返回结果。
返回代码如下：
后端通过out.println输出JavaScript代码，调用父窗口的回调函数，例如：out.println('<script>parent.callback(" 返回值 ")</script>');。列表页接收到响应后，执行相应的回调函数以完成交互。
核心文件代码实现
列表页面selectaddress.jsp的实现细节。
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="com.wap3.navigater.service.*" %>
<%@ page import="com.wap3.navigater.dao.*" %>
<%@ page import="com.wap3.navigater.pojo.*" %>
<%@ page import="com.wap3.navigater.util.*" %>
<%@ page import="java.util.*" %>
<%@ page import="java.text.*" %>
<!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">
<script type="text/javascript" src="../js/jquery.js"></script>
<script type="text/javascript" src="../js/ajax_edit.js"></script>
<script type="text/javascript" src="../js/jquery.jclock.js"></script>
<script type="text/javascript" src="../js/common.js"></script>
<script type="text/javascript" src="../js/jquery.form.js"></script>
<script type="text/javascript" src="../js/fileTypeJudge.js"></script>
<script type="text/javascript" src="../js/jquery.datepick.js"></script>
<script type="text/javascript" src="../js/jquery.datepick-zh-CN.js"></script>
<link media=all href="../css/common.css" type=text/css rel=stylesheet>
<title>Insert title here</title>
<style type="text/css">
@import "inc/jquery.datepick.css";
</style>
<script type="text/javascript">
var $imgthis;
$(function(){
var oldValue;
$(".package_list .edit").bind("dblclick",function(){
oldValue = $(this).text();
$(this).ajax_edit("editaddress.jsp",oldValue);
});
$(".package_list .edit_img").bind("dblclick",function(){ //
oldValue = $(this).html();
$imgthis = $(this);
$(this).parents("tr.package_list").siblings(".package_list").find(":input.cancel").trigger("click");
$(this).ajax_edit_img("editaddress.jsp",oldValue);
});
$(".package_list .edit :input[type!=file]:visible").live("blur",function(){
$(this).ajax_handle("editaddress.jsp?action=edit",oldValue);
});
$("#editcategoryName").live("change",function(){
$(this).ajax_handle("editaddress.jsp?action=edit",oldValue);
});
$("#del").click( function () {
if($(":checkbox.urlid:checked").size()>0){
var result = confirm("不可恢复的操作:确定要吗？"+ '\n' +"提示：如果删除大类会删除大类及下面的子类！！！");
if (result) {
var url = location.href;
alert(url);
return ;
$(".main_table").wrap("<form id='selectAddressForm' action='selectaddress.jsp?action=del' method='post'></form>");
$("#selectAddressForm").submit();
}
}else{
alert("请选择要删除的项目！");
return false;
}
});
});
function callback(msg) //处理JSP回调 过来的参数
{
$imgthis.html("<img class='logo' src='"+msg+"' title='"+msg+"' />");
}
</script>
</head>
<body>
<%
String action = ParameterUtil.getStringParameter(request,"action","");
FriendurlDao friendurlDao = new IbatisFriendurlDao();
if("del".equals(action)){
int[] urlids = ParameterUtil.getIntArrayParams(request,"urlid");
for(int urlid : urlids){
friendurlDao.deleteFriendurlByP(urlid);
}
}
String navigaterPage = request.getRequestURL().toString();
if(request.getQueryString()!= null){
navigaterPage += "?"+request.getQueryString();
}
int categoryId = ParameterUtil.getIntParameter(request,"categoryId",0);
if(categoryId == 0){
response.sendRedirect("selectcategory.jsp");
return;
}
int pageSize = ParameterUtil.getIntParameter(request,"pageSize",10);
int pageNo = ParameterUtil.getIntParameter(request,"pageNo",1);
String orderBy = ParameterUtil.getStringParameter(request,"orderBy","sequence");
int ascOrDesc = ParameterUtil.getIntParameter(request,"ascOrDesc",0);
CategoryDao categoryDao = new IbatisCategoryDao();
Category category = categoryDao.selectCategoryByP(categoryId);
String categoryName = category.getCategoryName();
Friendurl friendurl = new Friendurl();
friendurl.setCategoryId(categoryId);
friendurl.addOrderBy(orderBy,ascOrDesc);
List<Friendurl> friendurlList = friendurlDao.selectFriendurlByE(friendurl);
//分页
int totallpage = (int) Math.ceil(((double) friendurlList .size() * 1.0D)/ (double) pageSize);
pageNo =pageNo <= 0 ? 1 : pageNo;
pageNo =pageNo > totallpage ? totallpage : pageNo;
DataPageUtil datePage = new DataPageUtil(friendurlList ,friendurlList .size(),pageSize, pageNo);
boolean hasPrerPage = datePage.hasPrevPage();
boolean hasNextPage= datePage.hasNextPage();
int curpageNo = datePage.getPageNo();
int pageCount = datePage.getPageCount();
friendurlList = DataPageUtil.subList(friendurlList, pageSize, pageNo);
if(friendurlList == null && friendurlList.size()<=0) {
out.println("没有您需要的数据");
}else{
%>
<%@include file="inc/header.jsp" %>
<div id = "mainbox">
<div class = "c1">
<table class="main_table" width="100%" border="1" cellspacing="0" cellpadding="0">
<tr>
<th align="center" height="20" colspan="13" align="center" bgcolor="#006699">条目列表</th>
</tr>
<tr>
<td width="10%" height="20" align="center" bgcolor="#009999">
<input id="AllORNoall" type="checkbox"><label for="AllORNoall">全选</label>
<input type="button" id="reserse" value="反选" />
</td>
<td width="7%" height="20" align="center" bgcolor="#009999">站点名称</td>
<td width="7%" height="20" align="center" bgcolor="#009999">站点别名</td>
<td width="7%" height="20" align="center" bgcolor="#009999">归类</td>
<td width="7%" height="20" align="center" bgcolor="#009999">公司地址</td>
<td width="7%" height="20" align="center" bgcolor="#009999">文字链接</td>
<td width="7%" height="20" align="center" bgcolor="#009999">图片链接</td>
<td width="7%" height="20" align="center" bgcolor="#009999">描述</td>
<td width="7%" height="20" align="center" bgcolor="#009999">有效开始时间</td>
<td width="7%" height="20" align="center" bgcolor="#009999">有效结束时间</td>
<td width="7%" height="20" align="center" bgcolor="#009999">电话</td>
<td width="7%" height="20" align="center" bgcolor="#009999">位置排序</td>
<td width="7%" height="20" align="center" bgcolor="#009999">推荐序号</td>
</tr>
<%
for(Friendurl friendurlTemp:friendurlList) {
int urlId = friendurlTemp.getUrlid();
String siteName = friendurlTemp.getSitename();
String alias = friendurlTemp.getAlias();
String address = friendurlTemp.getAddress();
String texturl = friendurlTemp.getTexturl();
String imageurl = friendurlTemp.getImageurl();
String description = friendurlTemp.getDescription();
Date validbegintime = friendurlTemp.getValidbegintime();
Date validendtime = friendurlTemp.getValidendtime();
String mobile = friendurlTemp.getMobile();
int sequence = friendurlTemp.getSequence();
int filter = friendurlTemp.getFilter();
%>
<tr class="package_list">
<td height="20" align="center" class="urlid_td"><input type="checkbox" name="urlid" class="id_select urlid" value=<%= urlId%> /></td>
<td height="20" align="center" class="edit sitename"><%=siteName %></td>
<td height="20" align="center" class="edit alias"><%=alias %></td>
<td height="20" align="center" class="edit categoryName"><%=categoryName%></td>
<td height="20" align="center" class="edit address"><%=address %></td>
<td height="20" align="center" class="edit texturl"><%=texturl%></td>
<td height="20" align="center" class="edit_img imageurl"><img src='<%=imageurl%>' class='logo' title='<%=imageurl%>'/></td>
<td height="20" align="center" class="edit description"><%=description%></td>
<td height="20" align="center" class="edit validbegintime"><%=validbegintime == null || "".equals(validbegintime)? "--:--" : TimeUtil.date2Str(validbegintime)%></td>
<td height="20" align="center" class="edit validendtime"><%=validendtime == null || "".equals(validendtime)? "--:--" : TimeUtil.date2Str(validendtime)%></td>
<td height="20" align="center" class="edit mobile"><%=mobile%></td>
<td height="20" align="center" class="edit sequence"><%=sequence%></td>
<td height="20" align="center" class="edit filter"><%=filter%></td>
</tr>
<%
}
%>
<tr>
<td align="center"><input type="button" id="del" value="删除" /></td>
<td align="center" colspan = "12">提示：双击选框修改属性值</td>
</tr>
</table>
</div>
<%@ include file="inc/pagination.jsp"%>
</div>
<%
}
%>
<iframe name='hidden_frame' id="hidden_frame" style='display:none'></iframe>
</body>
</html>
后端处理页面editaddress.jsp的代码逻辑。
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="com.wap3.navigater.util.*" %>
<%@ page import="com.wap3.navigater.service.*" %>
<%@ page import="com.wap3.navigater.pojo.*" %>
<%@ page import="com.wap3.navigater.dao.*" %>
<%@ page import="java.util.*" %>
<%@ page import="java.text.*" %>
<%
String target = ParameterUtil.getStringParameter(request,"target","");
String action = ParameterUtil.getStringParameter(request,"action","");
if(!"".equals(target) && target != null && "edit".equals(action)){
int categoryId = 0;
CategoryDao categoryDao = null;
int urlid=0,status=0,sequence=0,filter=0;
String sitename=null,alias=null,texturl=null,imageurl=null,description=null,mobile=null;
Date validbegintime=null,validendtime=null;
if("imageurl".equals(target)){
System.out.println("图片上传");
UploadUtil.upload(request, response);
String imageurlpath = (String) request.getAttribute("imageurlpath");
urlid = Integer.parseInt((String)request.getAttribute("urlid"));
imageurl = (String)request.getAttribute("imageurlpath");
}else{
if("categoryName".equals(target)){
String categoryName = ParameterUtil.getStringParameter(request,"categoryName","");
Category category = new Category();
category.setCategoryName(categoryName);
categoryDao = new IbatisCategoryDao();
Category category2 = categoryDao.selectCategoryByE(category).get(0);
categoryId = category2.getCategoryId();
}else{
categoryId = ParameterUtil.getIntParameter(request,"categoryId",0);
}
urlid = ParameterUtil.getIntParameter(request,"urlid",0);
sitename = ParameterUtil.getStringParameter(request,"sitename","");
alias = ParameterUtil.getStringParameter(request,"alias","");
texturl = ParameterUtil.getStringParameter(request,"texturl","");
imageurl = ParameterUtil.getStringParameter(request,"imageurl","");
description = ParameterUtil.getStringParameter(request,"description","");
status = ParameterUtil.getIntParameter(request,"status",0);
sequence = ParameterUtil.getIntParameter(request,"sequence",0);
filter = ParameterUtil.getIntParameter(request,"filter",0);
mobile = ParameterUtil.getStringParameter(request,"mobile","");
validbegintime = ParameterUtil.getDateParameter(request,"validbegintime");
validendtime = ParameterUtil.getDateParameter(request,"validendtime");
}
Calendar beginDay=Calendar.getInstance();
Friendurl friendurl = new Friendurl();
friendurl.setUrlid(urlid);
friendurl.setSitename(sitename);
friendurl.setDescription(description);
friendurl.setTexturl(texturl);
friendurl.setImageurl(imageurl);
friendurl.setAlias(alias);
friendurl.setSequence(sequence);
friendurl.setMobile(mobile);
friendurl.setCategoryId(categoryId);
friendurl.setStatus(status);
friendurl.setValidbegintime(validbegintime);
friendurl.setValidendtime(validendtime);
friendurl.setFilter(filter);
FriendurlDao friendurlDao = new IbatisFriendurlDao();
friendurlDao.updateFriendurlByP(friendurl);
Friendurl friendurl2 = friendurlDao.selectFriendurlByE(friendurl).get(0);
if(friendurl2 != null){
String methodName = "get" + target.substring(0,1).toUpperCase()+target.substring(1);
if(target.endsWith("time")){
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
out.println(TimeUtil.date2Str(((Date)(friendurl2.getClass().getMethod(methodName,new Class[]{}).invoke(friendurl2,new Object[]{})))));
}else if("categoryName".equals(target)){
out.println(categoryDao.selectCategoryByP(friendurl2.getCategoryId()).getCategoryName());
}else if("imageurl".equals(target)){
// 无刷新关键的步骤，让iframe的父辈body执行callback这个函数
out.println("<script>parent.callback('"+friendurl2.getClass().getMethod(methodName,new Class[]{}).invoke(friendurl2,new Object[]{})+"')</script>");
}else{
out.println(friendurl2.getClass().getMethod(methodName,new Class[]{}).invoke(friendurl2,new Object[]{}));
}
}else{
out.println("更新失败");
}
}
%>
前端JavaScript脚本ajax_edit.js的具体实现。
(function(){
$.fn.extend({
ajax_edit:function(str,oldValue){
return this.each(function(){
$this = $(this);
var id;
var nameId = $this.attr("class").split(" ")[1];
var idName = $this.parents("tr.package_list").find("td:first-child :input[type=checkbox]").attr("class").split(" ")[1];
id = $this.siblings("."+idName+"_td").find("input").val();
if(nameId == "categoryName" && str == "editaddress.jsp"){
$this.load("categorylist.jsp",{'oldValue':oldValue,'urlid':id});
}else{
$this.html("<form id='selectaddressForm'><input type='hidden' name='"+idName+"' value='"+id+"' /><input type='hidden' name='target' value='"+nameId+"' /><input type='text' name='"+nameId+"' value='"+oldValue+"'/></form>");
$this.find(":input:last").focus();
}
})
},
ajax_edit_img:function(str,oldValue){ //处理图片上传AJAX 关键的一步form表格里的 target='hidden_frame'提交到ID为hidden_frame的iframe里面
return this.each(function(){
var $this = $(this);
var nameId = $this.attr("class").split(" ")[1];
var idName = $this.parents("tr.package_list").find("td:first-child :input[type=checkbox]").attr("class").split(" ")[1];
var id = $this.siblings("."+idName+"_td").find("input").val();
var $imgForm = $("<form id='selectaddressForm_img' action='editaddress.jsp?action=edit&target=imageurl' method='post' enctype='multipart/form-data' target='hidden_frame'><input type='hidden' name='"+idName+"' value='"+id+"' /><input type='file' name='"+nameId+"' /><input type='button' class='cancel' value='取消' /><input type='button' class='ok' value='上传' /></form>");
$this.html($imgForm);
$this.find(":input:last").focus();
$imgForm.find(":input[type=file]").bind("change",function(){
$(this).fileTypeJudge("photo");
})
$imgForm.find(":input.ok").bind("click",function(){
var $button = $(this);
if($imgForm.find(":input[type=file]").val()==''){
alert("请上传图片！");
return false;
}
$button.attr("disabled",true);
$("#selectaddressForm_img").submit();
})
$imgForm.find(":input.cancel").bind("click",function(){
$(this).parents(".edit_img").html(oldValue);
});
})
},
ajax_handle:function(str,oldValue){
return this.each(function(){
var $this = $(this);
setTimeout(function(){
if(!$("div").hasClass("datepick-control") || !$("div .datepick-control").is(":visible")){
if(oldValue != $this.val() && $this.val() !="" ){
$.post(
str,$("#selectaddressForm").serialize(),
function(data){
$this.parents(".edit").text(data.trim()).css("color","red");
}
)
}else{
$this.parents(".edit").text(oldValue);
}
}
},1000);
})
}
})
})(jQuery)
希望本文提供的技术方案能对读者的Ajax程序设计工作提供有益帮助。
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