在Springmvc中从控制器返回Hashmap到JSP

Question

$("select#country").change(function() {
var val=$("#country").val();
alert(val);
$.ajax({
url : 'getstates',
method : 'get',
contentType: 'application/json',
 data :{
          country : val
        },

  success: function (data) {
  alert("Success Response"+ data);

  },

   error :function()
   {
           alert("error");
    }          

   });

 @RequestMapping(value = "/getstates", method = RequestMethod.GET)
 public ModelAndView  showstates(@RequestParam(required = false, value = "") 
     String country,@Valid    @ModelAttribute("employee")Login employee, 
     BindingResult result, Model model) {  
    HashMap<String,String>  stateMap = new HashMap<String,String>();
     //put your logic to add state on basis of country

     if (country.equals("UnitedStates")) {
         stateMap.put("Al","Alaska");
         stateMap.put("Tl","Texas");

     } else if (country.equals("UnitedKingdom")) {
         stateMap.put("Be","Bedfordshire");
         stateMap.put("Ber","Berkshire");

     } else if (country.equals("India")) {
         stateMap.put("Mh","Maharashtra");
         stateMap.put("WB","West Bengal");
         stateMap.put("KR","Karnataka");
         stateMap.put("AP","Andhra Pradesh");
         stateMap.put("TN","Tamil Nadu");
     } 


     return new ModelAndView("LoginForm","state" ,stateMap);
 }

我正在使用Spring形式。我只需要得到Staemap作为响应，但我得到的是整个jsp页面作为响应。

Answer 1

我只需要得到Staemap作为响应，但我得到的是整个jsp页面作为响应。

因为您返回的是modelandview对象和此处的视图,

return new ModelAndView("LoginForm","state" ,stateMap);

如果您需要单独从controller方法返回respone，但是您不能在JSP上的Ajax响应中直接打印hashmap。IMHO您可以将其转换为JSONARRAY

JSONArray jarray = JSONArray.fromObject(statemap);

读,

>

在MVC中使用JSON将数组从控制器发送到视图

从spring控制器发送JSON响应