使用jqueryajax检索纯文本并转换为JSON

更新:

$.getJSON('myUrl/solr/select/?q=citystate%3ASea*&version=2.2&start=0&rows=3&indent=on&wt=json&fl=citystate', function(data) {
  alert(data.response.docs[0].citystate);
});

我有一个jetty服务器,它将json数据生成为纯文本-标题如下:

Last-Modified   Wed, 06 Oct 2010 23:22:27 GMT
Etag    "OTI5YWMzYzFkNDgwMDAwMFNvbHI="
Content-Type    text/plain; charset=utf-8
Content-Length  565
Server  Jetty(6.1.3)

{
 "responseHeader":{
  "status":0,
  "QTime":1,
  "params":{
    "fl":"citystate",
    "indent":"on",
    "start":"0",
    "q":"citystate:Sea*",
    "wt":"json",
    "version":"2.2",
    "rows":"10"}},
 "response":{"numFound":233,"start":0,"docs":[
    {
     "citystate":"Seaboard, AL"},
    {
     "citystate":"Seale, AL"},
    {
     "citystate":"Seacliff, AL"},
    {
     "citystate":"Sealy Springs, AL"},
    {
     "citystate":"Searcy, AL"},
    {
     "citystate":"Searight, AL"},
    {
     "citystate":"Searles, AL"},
    {
     "citystate":"Seasha, AL"},
    {
     "citystate":"Searcy, AR"},
    {
     "citystate":"Seaton, AR"}]
 }}

我想使用jquery ajax调用检索此数据,如下所示:

$.ajax({
  type: "GET",
  url: "myUrl/?q=citystate%3ASea*&version=2.2&start=0&rows=10&indent=on&wt=json&fl=citystate",
  dataType: "json",
  contentType: "text/plain; charset=utf-8",
  success: function(data, textStatus){
    alert("data: " + data);
  },
  error: function(data){
    alert("error");
  }
});

但是,我得到的结果总是空的。我做错什么了?