form+iframe解决跨域上传文件的方法
编程学习 2021-07-04 19:19www.dzhlxh.cn编程入门
狼蚁网站SEO优化长沙网络推广就为大家带来一篇form+iframe解决跨域上传文件的方法。长沙网络推广觉得挺不错的，现在就分享给大家，也给大家做个参考。一起跟随长沙网络推广过来看看吧
(1) jsp代码：
<form id="form" name="form" enctype="multipart/form-data" method="post" target="hidden_frame"> <table style="border:0;width:100%;text-align:middle;"> <tr style="border:0;height:20px;width:100%;"> <td style="border:0;width:75px;height:20px;line-height:20px;">控件标识</td> <td> <input id="viewkey" name="viewkey" style="width:200px;" type="text" maxlength="300" placeholder="控件标识不能超过30个字。" class="easyui-validatebox" onkeyup="check()" required="true" missingMessage="参数名称不可为空."/> </td> </tr> <tr> <td>更新类型</td> <td><input id="type" name="type" class="easyui-combobox" valueField="id" textField="text" panelHeight="auto"/></td> </tr> <tr> <td>备注</td> <td colspan=3> <textarea id="remark" name="remark" onkeyup="check()" placeholder="备注不能超过300个字。" style="width:200px;height:80px;" ></textarea> </td> </tr> <tr> <td>资源文件：</td> <td > <input type="file" id="file" name="file" style="height:25px; width:200px;" onchange="fileChange(this);"> <input type="hidden" name="projectid" id="projectid" > <input type="hidden" name="downimageconfigid" id="downimageconfigid" > <input type="hidden" name="iskeychange" id="iskeychange" > <input type="hidden" name="isnopic" id="isnopic" > <iframe name="hidden_frame" id="hidden_frame" style="display:none"></iframe> </td> </tr> <tr> <td></td> <td><div style="color: red; margin-top: 10px;">图片大小必须小于500K。</div></td> </tr> </table> </form>
说明：form中的target指向iframe中的name。这点要注意。
(2) js代码：
//添加对话框
function initDialog(){
$('#imgconf-dialog').dialog({
modal:true,
closable:false,
top: 20,
buttons:[{
id:'ut_add',
text:'确定',
iconCls:'icon-ok',
handler:function(){
//表单注册事件
$('#form').form({
success:function(data){//提交成功后的回调函数
if(data === '00'){
jqueryAlert('操作成功');
}
if(data === '03'){
$.messager.alert(global.title,'主键为空!','warning');
$('#ut_add').linkbutton('enable');
return;
}
if(data === '02'){
$.messager.alert(global.title,'已存在的控件标识!','warning');
$('#ut_add').linkbutton('enable');
return;
}
if(data === '01'){
$.messager.alert(global.title,'操作失败','warning');
$('#ut_add').linkbutton('enable');
return;
}
$('#imgconf-dialog').dialog('close');
//重新加载列表
getDataGridData();;
}
});
$('#ut_add').linkbutton('disable');
//【添加】
if(global.operatype == 'add'){
if($('#viewkey').val() == null || $('#viewkey').val() == ''){
$.messager.alert(global.title,'您尚未输入控件标识!','warning');
$('#ut_add').linkbutton('enable');
return;
}
if($('#file').val() == ''){
$.messager.alert(global.title,'您尚未上传图片!!','warning');
$('#ut_add').linkbutton('enable');
return;
}
//表单上传操作
$('#projectid').val(global.projectid);
$('#form').attr("action", global.web_path + "/grid/imgconf/addimgconf.do");
$("#form").submit();
$('#ut_add').linkbutton('disable');
} else {//【编辑】
//控件标识是否改变
var iskeychange;
if(selected.viewkey == $('#viewkey').val()){//控件标识没有改变
iskeychange = 'no';
}else{
iskeychange = 'yes';
}
var isnopic;
if($('#file').val() == ''){//是否有上传图片
snopic = 'yes';
}else{
isnopic = 'no';
}
//表单上传操作
$('#projectid').val(global.projectid);
$('#downimageconfigid').val(selected.downimageconfigid);
$('#iskeychange').val(iskeychange);
$('#isnopic').val(isnopic);
$('#form').attr("action",global.web_path + "/grid/imgconf/modimgconf.do");
$("#form").submit(); ;
$('#ut_add').linkbutton('disable');
}
}
},{
id:'ut_close',
text:'退出',
handler:function(){
$('#ut_add').linkbutton('enable');
$('#imgconf-dialog').dialog('close');
$('#uploadify').uploadifyClearQueue();
}
}]
});
}
//重置
function reset(){
$('#ut_add').linkbutton('enable');
var target = $('#file');
if(global.operatype == 'mod'){
$('#imgconf-dialog').dialog('setTitle','修改');
$('#viewkey').val(selected.viewkey);
$('#type').combobox('setValue', selected.type);
$('#remark').val(selected.remark);
$('#imgconf-dialog').dialog('open');
//文件上传清空
deleteFile('file');
}else {
$('#imgconf-dialog').dialog('setTitle','添加');
$('#viewkey').val('');
$('#remark').val('');
//文件上传清空
deleteFile('file');
}
}
/**
* 文本区域限制长度
*/
function check(){
var content = $('#remark').val();
len = content.length;
var maxlen = 300;
if(len > maxlen){
alert("字数太长，已被截断为300字!");
$('#remark').val(content.substr(0,maxlen));
}
}
// input type='file'置位操作
function deleteFile(file){
var ie = (navigator.appVersion.indexOf("MSIE")!=-1);//IE
var ff = (navigator.userAgent.indexOf("Firefox")!=-1);//Firefox
if(ie){
refreshUploader($("input[name="+file+"]")[0]);
}
else{
$("input[name="+file+"]").attr("value","");
}
}
function refreshUploader(file){
var file2= file.cloneNode(false);
file2.onchange= file.onchange;
file.parentNode.replaceChild(file2,file);
}
//检测文件大小和类型
function fileChange(target){
//检测上传文件的类型
if(!(/(?:jpg|gif|png|jpeg)$/i.test(target.value))) {
alert("只允许上传jpg|gif|png|jpeg格式的图片");
if(window.ActiveXObject) {//for IE
target.select();//select the file ,and clear selection
document.selection.clear();
} else if(window.opera) {//for opera
target.type="text";target.type="file";
} else target.value="";//for FF,Chrome,Safari
return;
} else {
return; //alert("ok");//or you can do nothing here.
}
//检测上传文件的大小
var isIE = /msie/i.test(navigator.userAgent) && !window.opera;
var fileSize = 0;
if (isIE && !target.files){
var filePath = target.value;
var fileSystem = new ActiveXObject("Scripting.FileSystemObject");
var file = fileSystem.GetFile (filePath);
fileSize = file.Size;
} else {
fileSize = target.files[0].size;
}
var size = fileSize / 1024;
if(size>(500)){
alert("文件大小不能超过500KB");
if(window.ActiveXObject) {//for IE
target.select();//select the file ,and clear selection
document.selection.clear();
} else if(window.opera) {//for opera
target.type="text";target.type="file";
} else {
target.value="";//for FF,Chrome,Safari
}
return;
}else{
return;
}
}
(3) 后台java代码：
/**
* 添加下载图片配置
* @throws IOException
*/
@RequestMapping(value = "/grid/imgconf/addimgconf",method = {RequestMethod.POST, RequestMethod.GET},produces = {"text/html;charset=UTF-8"})
@ResponseBody
public String addImgConf(HttpServletRequest
request, HttpServletResponse response, BindException errors) throws IOException{
String m = "00";
MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
Map<String, MultipartFile> fileMap = multipartRequest.getFileMap();
response.setHeader("Access-Control-Allow-Origin", "*");
String projectid = Function.dealNull(multipartRequest.getParameter("projectid"));
String viewKey = Function.dealNull(multipartRequest.getParameter("viewkey"));
String type = Function.dealNull(multipartRequest.getParameter("type"));
String remark = Function.dealNull(multipartRequest.getParameter("remark"));
try {
//唯一性判断
int size = imgConfService.getImgConfsCount(Constants.DEF_STRING_NULL, projectid, viewKey, Constants.STATUS_ON);
if(size > 0){
m = "02";
logger.info("已存在的控件标识!");
return "<textarea>" + m + "</textarea>";
}
//上传图片
Map<String, String> picInfo = imgConfService.uploadImage(fileMap);
imgConfService.addImgConf(UUID.randomUUID().toString(), projectid, viewKey, type, remark, picInfo.get("URL"), Constants.STATUS_ON);
m = "00";
logger.info("添加下载图片配置成功！");
} catch (Exception e) {
m = "01";
logger.error("添加下载图片配置失败" ,e);
}
//加<textarea>以解决IE下submit后没有执行回调success函数，这个是jquery easyui form的bug
return "<textarea>" + m + "</textarea>";
}
说明："<textarea>" + m + "</textarea>";和produces = {"text/html;charset=UTF-8"}解决IE下不能执行回调函数success的问题
以上这篇form+iframe解决跨域上传文件的方法就是长沙网络推广分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持狼蚁SEO。