kindeditor和struts2结合后富文本中上传图片不成功的问题

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page import="java.util.*,java.io.*" %>
<%@ page import="java.text.SimpleDateFormat" %>
<%@ page import="org.apache.commons.fileupload.*" %>
<%@ page import="org.apache.commons.fileupload.disk.*" %>
<%@ page import="org.apache.commons.fileupload.servlet.*" %>
<%@ page import="org.json.simple.*" %>
<%@ page import="org.apache.struts2.dispatcher.multipart.MultiPartRequestWrapper" %>

<%
//文件保存目录路径
//D:\Tomcat6.0\webapps\zswz\attached/
String savePath = request.getSession().getServletContext().getRealPath("/") + "attached/";
//文件保存目录URL /zswz/attached/
String saveUrl = request.getContextPath() + "/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<String, String> extMap = new HashMap<String, String>();
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.<String>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();
}
%>