本文实例讲述了jsp+ajax实现无刷新上传文件的方法。分享给大家供大家参考，具体如下：
列表页：selectaddress.jsp
js页：ajax_edit.js
jsp处理页：editaddress.jsp
上传工具类：UploadUtil.java
思想：由于安全问题，javascript操纵不了文件， 导致ajax不能动态上传文件，所以选择了iframe，
列表页把form表单提交到一个隐式的iframe里面，设置表单的属性复制代码 代码如下:enctype='multipart/form-data' target='hidden_frame'
然后，处理页处理后返回复制代码 代码如下:out.println('');
列表页执行回调函数！
selectaddress.jsp
<%@ 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.*" %>Insert title here @import "inc/jquery.datepick.css"; <% 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 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" %> <%@ include file="inc/pagination.jsp"%> <% } %>
条目列表 <% 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(); %> 站点名称 站点别名 归类 公司地址 文字链接 图片链接 描述 有效开始时间 有效结束时间 电话 位置排序 推荐序号 <% } %> /> <%=siteName %> <%=alias %> <%=categoryName%> <%=address %> <%=texturl%> ' class='logo' title='<%=imageurl%>'/> <%=description%> <%=validbegintime == null || "".equals(validbegintime)? "--:--" : TimeUtil.date2Str(validbegintime)%> <%=validendtime == null || "".equals(validendtime)? "--:--" : TimeUtil.date2Str(validendtime)%> <%=mobile%> <%=sequence%> <%=filter%> 提示：双击选框修改属性值
editaddress.jsp
<%@ 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("");
}else{
out.println(friendurl2.getClass().getMethod(methodName,new Class[]{}).invoke(friendurl2,new Object[]{}));
}
}else{
out.println("更新失败");
}
}
%>
ajax_edit.js
(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("");
$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 = $("");
$this.html($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)
希望本文所述对大家ajax程序设计有所帮助。
