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