struts也可以使用ajax异步调用页面局部刷新

var url = "checkonly.do?cid="+cid;

xmlHttp.open("GET", url, true);
//将状态触发器绑定到一个函数
xmlHttp.onreadystatechange = callbackfunction;
xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xmlHttp.send(null);

public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
ProcessBean processor = new ProcessBean(getDataSource(request));
String cid = request.getParameter("cid");
PrintWriter out = null;
int responseContext = 0;
try {
out = response.getWriter();
out.println(processor.Checkonly(cid));
out.flush();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}