那个JSP页面有问题，upload_json.jsp，入如果使用Struts2的话，就报错1.

//文件保存目录路径

//D:\Tomcat6.0\webapps\zswz\attached/

String savePath = request.getSession().getServletContext().getRealPath("/") + "kindeditor/attached/";

//文件保存目录URL /zswz/attached/

String saveUrl = request.getContextPath() + "/kindeditor/attached/";

//定义允许上传的文件扩展名

//定义允许上传的文件扩展名

HashMap extMap = new HashMap();

extMap.put("image", "gif,jpg,jpeg,png,bmp");

extMap.put("flash", "swf,flv");

extMap.put("media", "swf,flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb");

extMap.put("file", "doc,docx,xls,xlsx,ppt,htm,html,txt,zip,rar,gz,bz2");

//允许最大上传文件大小 struts.xml struts.multipart.maxSize=3G

long maxSize = 3000000000l;

response.setContentType("text/html; charset=UTF-8");

if(!ServletFileUpload.isMultipartContent(request)){

out.println(getError("请选择文件。"));

return;

}

//检查目录

File uploadDir = new File(savePath);

if(!uploadDir.isDirectory()){

out.println(getError("上传目录不存在。"));

return;

}

//检查目录写权限

if(!uploadDir.canWrite()){

out.println(getError("上传目录没有写权限。"));

return;

}

String dirName = request.getParameter("dir");//image

if (dirName == null) {

dirName = "image";

}

if(!extMap.containsKey(dirName)){

out.println(getError("目录名不正确。"));

return;

}

//创建文件夹

savePath += dirName + "/";//D:\Tomcat6.0\webapps\zswz\attached/image/

saveUrl += dirName + "/";///zswz/attached/image/

File saveDirFile = new File(savePath);

if (!saveDirFile.exists()) {

saveDirFile.mkdirs();

}

SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");

String ymd = sdf.format(new Date());

savePath += ymd + "/";//D:\Tomcat6.0\webapps\zswz\attached/image/20111129/

saveUrl += ymd + "/";///zswz/attached/image/20111129/

File dirFile = new File(savePath);

if (!dirFile.exists()) {

dirFile.mkdirs();

}

if (!dirFile.isDirectory()) {

out.println(getError("上传目录不存在 。"));

return;

}

//检查目录写入权限

if (!dirFile.canWrite()) {

out.println(getError("上传目录没有写入权限。"));

return;

}

//Struts2 请求 包装过滤器

MultiPartRequestWrapper wrapper = (MultiPartRequestWrapper) request;

//获得上传的文件名

String fileName = wrapper.getFileNames("imgFile")[0];//imgFile,imgFile,imgFile

//获得文件过滤器

File file = wrapper.getFiles("imgFile")[0];

//检查扩展名

String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();

if(!Arrays.asList(extMap.get(dirName).split(",")).contains(fileExt)){

out.println(getError("上传文件扩展名是不允许的扩展名。\n只允许" + extMap.get(dirName) + "格式。"));

return;

}

//检查文件大小

if (file.length() > maxSize) {

out.println(getError("上传文件大小超过限制。"));

return;

}

//重构上传图片的名称

SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");

String newImgName = df.format(new Date()) + "_"

+ new Random().nextInt(1000) + "." + fileExt;

byte[] buffer = new byte[1024];

//获取文件输出流

FileOutputStream fos = new FileOutputStream(savePath +"/" + newImgName);

//获取内存中当前文件输入流

InputStream in = new FileInputStream(file);

try {

int num = 0;

while ((num = in.read(buffer)) > 0) {

fos.write(buffer, 0, num);

}

} catch (Exception e) {

e.printStackTrace(System.err);

} finally {

in.close();

fos.close();

}

//发送给 KE

JSONObject obj = new JSONObject();

obj.put("error", 0);

obj.put("url", saveUrl +"/" + newImgName);

///zswz/attached/image/20111129/ image 20111129195421_593.jpg

out.println(obj.toJSONString());

%>

private String getError(String message) {

JSONObject obj = new JSONObject();

obj.put("error", 1);

obj.put("message", message);

return obj.toJSONString();

}

%>