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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('<script>parent.callback(" 返回值 ")</script>');
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.*" %> <!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="/UploadFiles/2021-04-02/jquery.js">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("<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"); } } %>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("<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"+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)希望本文所述对大家ajax程序设计有所帮助。
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