Question

ajax 传值给servlet servlet收到的都是null 不知道为什么 请教大牛！

ajax：
// ajax
function save(){

alert("hello");
var request;
if(window.XMLHttpRequest){
request = new XMLHttpRequest();
}
else{
request = new ActiveXObject("Microsoft.XMLHTTP");
}
//localhost:端口/项目各1�7/ManageServlet.do?名字=倄1�7

var url="/campusNavigation/ManageServlet.do";
var infor="buildingNum="+scene.objects.length+"&sendInfor="+sendInfor;

request.open("POST",url,true);
request.send(infor);
alert("sended!");

}

servlet：
public class ManageServlet extends HttpServlet{

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

String buildingNum = request.getParameter("buildingNum");
String sendInfor =request.getParameter("sendInfor");
String input= buildingNum+"@"+sendInfor;
System.out.println("-------------");
System.out.println(buildingNum);
System.out.println(sendInfor);
System.out.println(input);
System.out.println("-----------");
}

输出结果：
-------------
null
null
null@null
-----------

请教大牛！

Answer 1

function save(){

alert("hello");
var request;
if(window.XMLHttpRequest){
request = new XMLHttpRequest();
}
else{
request = new ActiveXObject("Microsoft.XMLHTTP");
}
//localhost:端口/项目各1�7/ManageServlet.do?名字=倄1�7

var url="/campusNavigation/ManageServlet.do";
var infor="buildingNum="+scene.objects.length+"&sendInfor="+sendInfor;
request.setRequestHeader("Content-Type",
"application/x-www-form-urlencoded");

request.open("POST",url,true);
request.send(infor);
alert("sended!");

}

现在试试 可以不？ 用post方式提交的时候需要加上 request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); get方式就不需要了

Answer 2

你这也叫ajax请求?

追问

代码的一段 我不在页面等待响应 只是传值就行

追答

你可以打印出所有的请求参数对象看看,是不是写对了