js 利用iframe和location.hash跨域解决的方法，java图片上传回调JS函数跨域

奶奶的：折腾了我二天，最终攻克了！网上有非常多样例。

但跟我的都不太一样，费话不多说了，上图上代码： IE ,firefix,chrome 測试通过

js :这个主页面，部分代码，

function submitUpload(id){

	$("#imgSrc" + id +"").attr("alt", "图片上传中……");

	var imgID = id;

	if(id>0){

		imgID = 1;

	}

	var form=document.getElementById("formImg" + imgID +"");

	//form.action = getContextPath()+"/pc/sys/photoupload/singleup"; //必须先包括sys.js文件

	form.method = "post";

	form.idnum.value = id;

	var uriUp=domainStr+"/pc/sys/photoupload/singleup";

	form.action = uriUp;

	//用于返回

	var currentHref=window.location.href;

	var subHref=currentHref.substring(0, currentHref.lastIndexOf("/"));

	var input_domain = document.createElement("input");

	input_domain.setAttribute("name", "currentDomain");

	input_domain.setAttribute("value", subHref+"/callback-up.html");

	input_domain.setAttribute("type", "hidden");

	form.appendChild(input_domain);

	form.submit();

	//假设已经存在的图不是原图，则把server中的图片删除

	var currentPicPath =  $("#imgUrl" + id +"").val();

	if(!contains(origPics, currentPicPath) && currentPicPath!=""){

		delImg(currentPicPath, true);//true 删除图片

	}

};

// step2: 上传图片，后台回调

function callback(message) {

	var id=message.id;

	if(message.status.code=="0"){

		var filePath=message.filePath;

		var dbFilePath=message.dbFilePath;

		$("#imgUrl" + id +"").attr("value", dbFilePath);

		$("#imgSrc" + id +"").attr("src", filePath);

	}else{

		if(id!=0){

			$("#imgSrc" + id).parent().remove();

		}

		_message(message.status.message); //上传错误提示

	}

};

服务端处理主要代码：

	// -----------------------------------------------------------------------------------

	// 单张图片上传，返回路径

	// ----------------------------------------------------------------------------------

	@RequestMapping(value = "/singleup", method = RequestMethod.POST)

	public void SingleUp(HttpServletRequest request, HttpServletResponse response, @RequestParam(value = "suffixDir", required = true) String suffixDir,

			@RequestParam(required = false, value = "cutPhoto") boolean cutPhoto, @RequestParam(required = false, value = "merchantId") String merchantId) throws Exception

	{

		StringBuffer basePath=new StringBuffer(request.getScheme());

		basePath.append("://");

		basePath.append(request.getServerName());

		basePath.append(":");

		basePath.append(request.getServerPort());

		basePath.append(request.getContextPath());

		basePath.append("/");

		basePath.append(FileUpload.getRealFilePath()/*.substring(0,FileUpload.getRealFilePath().length()-1)*/);

		User user = super.getLoginUser(request).getUser();

		if (user != null)

		{

			String filePath = fileUploadService.singleUpload(request, user, suffixDir, Fs.FileUpLoadType.PHOTO, cutPhoto, merchantId);

			// 处理返回状态

			UpoladStatus result = getStatus(filePath);

			String PromptSize = "";

			if (UpoladStatus.类型无效或图片过大.toString().equals(result.toString()))

			{

				// 2^10=1024

				PromptSize = "(最大限制:" + (FileUpload.photoSize >> 20) + "MB)";

			}

			PrintWriter out = response.getWriter();

			response.setHeader("Cache-Control", "none-cache");

			String idnum = request.getParameter("idnum");

			String reutrnDate = "{'id':'" + idnum + "','filePath':'" + basePath.append(filePath).toString() + "','dbFilePath':'" + filePath + "','status':{'code':'" + result.ordinal() + "','message':'" + result.name()

					+ PromptSize + "'}}";

			String currentDomain = request.getParameter("currentDomain");

			//<script>parent.parent.callback(" + reutrnDate + ");</script>

			String ret="<iframe id=\"ifr\" src=\""+currentDomain+"#"+reutrnDate+"\"></iframe>";

			//log.info("ret===:"+ret);

			out.print(ret);

		}

	}

中间html 转换用，关健

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

    <title></title>

</head>

<body>

<script type="text/javascript">

//alert(document.domain);

var returndata=self.location.hash.substring(1);

var message = eval('(' + returndata + ')');

parent.parent.callback(message);

</script>

</body>

</html>

我不善长写讲程，真接看代码吧....

參考博文:http://www.cnblogs.com/rainman/archive/2011/02/20/1959325.html#m3