JFinal 3ff0 +CKEditor文件上传后缀验证，大小验证。

public void index(){
String extName = "";// 扩展名
String fileName = "";// 文件名
String newFileName = "";// 新文件名

try {
String strPath = JFinal.me().getServletContext().getRealPath("/upload/news/");
UploadFile upload = getFile("bigPic", strPath, 2097152);
String uploadFileName = upload.getFileName();

String CKEditorFuncNum = getPara("CKEditorFuncNum");

// 获取扩展名
if (uploadFileName.lastIndexOf(".") > -1) {
extName = getExtention(upload.getFileName());
fileName = uploadFileName.substring(0,uploadFileName.lastIndexOf("."));
}
newFileName = fileName+"-"+Tools.getFileName() + extName;
if (!".jpg.gif.png,bmp.JPG.GIF.PNG.BMP".contains(extName)) {
FileKit.delete(upload.getFile());
renderHtml("<script type=\"text/javascript\">alert(\"请上传图片文件。\");</script>");
} else {
File f = upload.getFile();

InputStream is = new FileInputStream(f);
OutputStream os = new FileOutputStream(new File(strPath + File.separator + newFileName));
try {
byte[] buffer = new byte[1024 * 1024];
while (is.read(buffer) > 0) {
os.write(buffer);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (is != null) {
is.close();
}
if (os != null) {
os.close();
}
}
// 删除原文件
FileKit.delete(upload.getFile());
// 返回给ckeditor
renderHtml("<script type=\"text/javascript\">window.parent.CKEDITOR.tools.callFunction("
+ CKEditorFuncNum + ", '"+getBasePath(getRequest())+"upload/news/" + newFileName + "', '');</script>");
}
}catch (RuntimeException e) {
// TODO: handle exception
renderHtml("<script type=\"text/javascript\">alert(\"上传的文件有误，请重新上传。\");javascript:history.go(-1);</script>");
} catch (Exception e) {
e.printStackTrace();
renderHtml("<script type=\"text/javascript\">alert(\"上传文件失败，请联系管理员。\");</script>");
}
}