//ajax 跨域请求数据

function ajaxType (){

$.ajax({

url: "http://127.0.0.1:9090/spring_mvc/HttpClient/ajaxType.do?jsonpCallback=?",

type: "GET",

data: { pwd: encodeURI('周'), username: 'tl' },

dataType: "jsonp",

success: function(data) {

//返回 为 map 一个 key 对应 多个 list

var list = data.ok ;

//获取长度list.length

alert(list[0]);//List第一个数据

}

});

}

 

控制器

 

//调用ajax 跨域调用接口

@RequestMapping(value = "ajaxType", method = RequestMethod.GET)

public void ajaxType(HttpServletRequest request, HttpServletResponse response){

try {

Map<String, List<Object>> map = new HashMap<String, List<Object>>();

List<Object> list = new ArrayList<Object>();

list.add("测试1");

list.add("测试2");

list.add("测试3");

list.add("测试4");

list.add("测试5");

map.put("ok", list);

String pwd = URLDecoder.decode(request.getParameter("pwd"),"UTF-8");//解码

PrintWriter out = response.getWriter();

JSONObject resultJSON = JSONObject.fromObject(map); // 根据需要拼装json

String jsonpCallback = request.getParameter("jsonpCallback");// 客户端请求参数

out.println(jsonpCallback + "(" + resultJSON.toString(1, 1) + ")");// 返回jsonp格式数据

System.out.println(jsonpCallback + "(" + resultJSON.toString(1, 1) + ")");

out.flush();

out.close();

} catch (Exception e) {

}

}