servlet ajax 返回
<script type="text/JavaScript">
var xmlhttprequest;
function CreateRequest()
{
if(window.ActiveXObject){
return new ActiveXObject("Microsoft.XMLHTTP");
}else if(window.XMLHttpRequest){
return new XMLHttpRequest();
}
}
function CheckUser(){
var vuid=document.getElementById("textfield").value;
var vpass=document.getElementById("textfield2").value;
var vauthorn=document.getElementById("choicefield").options[window.document.getElementById("choicefield").selectedIndex].value;
if((vuid=='')||(vpass=='')){
if(vuid==''){
alert("用户名不能为空！");
}else if(vpass==''){
alert("密码不能为空！");
}else {
alert("请输入有效的用户名和秘密！");
}
}else{
var url="/Obj_BMS/servlet/logincall?vuid="+vuid+"&vpass="+vpass+"&vauthorn="+vauthorn;
xmlhttprequest=CreateRequest();
xmlhttprequest.onreadystatechange=HaoLeJiaoWo;
xmlhttprequest.open("POST",url,true);
xmlhttprequest.send(null);
}
}
function HaoLeJiaoWo()
{
if(xmlhttprequest.readyState==4)
{
if(xmlhttprequest.status==200)
{
var vreturn=xmlhttprequest.responseText;
switch(parseInt(vreturn)){
case 1:
window.location.href="/Obj_BMS/servlet/bookclass";
break;
case 2:
window.location.href="/Obj_BMS/pagelibr/librinfo.jsp";
break;
case 3:
window.location.href="/Obj_BMS/pagebbms/addbook.jsp";
break;
default:
alert(" 用户名或密码有误\n请输入正确的用户名和密码！");
MM_clickempty();
break;
}
}
}
}
</script>
=============servlet ajax 返回out.println(objreturn);==============
objreturn=dbid+"~"+dbname+"!"+dbauthor+"@"+dbpublish+"#"+dbcount+"$"+dbphoto+"^"+dbmark+"|";
}
}catch(Exception e){
e.printStackTrace();
}finally{
ConnectionManager.closeConnection(con);
}
//out.println(objary);
out.println(objreturn);
out.flush();
out.close();
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}