form+iframe解决跨域上传文件的方法

(1)  jsp代码：

 
	

		

			
控件标识
			

				
			
		
		

			
更新类型
			

		
		

			
备注
			

						
			
		
		

			
资源文件：
			

				
				
				
				
				
				 
			
		
		

			

			
图片大小必须小于500K。
		
	

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 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 "" + m + "";
}
//上传图片
  Map 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);
}

//加以解决IE下submit后没有执行回调success函数，这个是jquery easyui form的bug<br> return "<textarea>" + m + "";
}

说明："" + m + "";和produces = {"text/html;charset=UTF-8"}解决IE下不能执行回调函数success的问题

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