我通过ajax调用发送一个json对象 当我尝试打印json的值时,我得到了空值。
我做错了什么?
的Servlet
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
response.setContentType("application/json");
response.setCharacterEncoding("UTF-8");
response.getWriter().write("[{\"PARENT\":\"2\",\"VAL\":\"X7280\"},{\"PARENT\":\"2\",\"VAL\":\"X8338\"}]");
}
的javascript:
function handleIt() {
var url = "myservlet";
var parameters = "method=method";
http.open("POST", url, true);
http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
http.setRequestHeader("Content-length", parameters.length);
http.setRequestHeader("Connection", "close");
http.onreadystatechange = function() {
if(http.readyState == 4) {
var ddl3 = http.responseText;
for(var key in ddl3){
var id = ddl3[key].PARENT;
var lbl = ddl3[key].VAL;
alert (lbl);
}
}
}
http.send(parameters);
}