action措辞：
public ActionForward fileIsExsit(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
String url = request.getParameter("loadFile");
File file = new File(request.getServletContext().getRealPath("/") + url);
response.setCharacterEncoding("utf-8");
PrintWriter out;
try {
out = response.getWriter();
if (!file.exists()) {
out.print("no");
}
out.flush();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
页面中js的写法：
//验证文件是否存在
function valFile(url){
$.post(url,{參数列表},function(result){
alert(result);
});
}
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