Java 在spring框架中，如何通过ajax调用将id值传递给控制器，从控制器获取对jsp页面的响应

在我的程序中，我需要通过传递id来执行一个操作。id是从下拉框中选择的（即动态更改）。因此，为了传递id，我正在使用ajax。但我不知道在spring中从controller接收响应的代码

<div class="form-group">
   <label  class="col-sm-4 control-label">Employee</label>
   <div class="col-sm-6">
     <select id="empId" name="empId" class="form-control" >
        <option value="" >--Select--</option>
        <c:forEach var="row" items="${employeeList}" >
          <option value="${employeeList.Id}">${employeeList.name</option>
        </c:forEach> 
     </select>
   </div>
   <div class="col-sm-6">
     <input type="text" name="empname" id="empname" class="form-control"/>
   </div>
 </div>


//i need to pass the employee id from the dropdown box to controller and get     //the name of the employee as response .and set the response value in the text     //box.how can be it done in spring using ajax.

---

这里是ajax端代码：

$('#empId').change(function() {  
    $.ajax({
            type: 'POST',
            dataType: 'json',
            url: 'your_url', // in your controller side (RequestMapping value)
            data: 'empId='+$('#empId').val(),
            success: function(responseData, textStatus) {
                // your stuff here. you found the response in responseData var.
            },
            complete: function(textStatus) {

            },
            error: function(responseData)
            {

            }
    });
});

控制器端代码如下所示

@RequestMapping(value = "your_url", method = RequestMethod.POST)
    public ResponseEntity<String> postMethod(HttpServletRequest req) {
        String jsonString = "";
        String empId = req.getParameter("empId");
        // your operation done here and 
        //convert it to json format before sending response.
        jsonString = gson.toJson("your response convert here to json format"); // here i used google Gson library to convert your response in json format.

        HttpHeaders responseHeaders = new HttpHeaders();
        responseHeaders.add("Content-Type", "text/html; charset=utf-8");
        return new ResponseEntity<String>(jsonString, responseHeaders, HttpStatus.CREATED);
    }

@RequestMapping（value=“your_url”，method=RequestMethod.POST）
公共响应postMethod（HttpServletRequest请求）{
字符串jsonString=“”；
字符串empId=req.getParameter（“empId”）；
//你的手术在这里完成了
//在发送响应之前将其转换为json格式。
jsonString=gson.toJson（“您的响应在此处转换为json格式”）；//这里我使用google gson库将您的响应转换为json格式。
HttpHeaders responseHeaders=新的HttpHeaders（）；
add（“内容类型”，“text/html；charset=utf-8”）；
返回新的ResponseEntity（jsonString、responseHeaders、HttpStatus.CREATED）；
}

您想知道如何通过ajax调用控制器，以及控制器的方法是什么吗？我的意思是ajax调用和控制器端代码？@Ataur Rahman Munna:yesI粘贴一些示例代码。如果有帮助，请接受答案。谢谢。@Ataur Rahman Munna粘贴的代码是有用的。谢谢，然后您可以单击“接受”按钮接受我的答案。：）

@RequestMapping(value = "your_url", method = RequestMethod.POST)
    public ResponseEntity<String> postMethod(HttpServletRequest req) {
        String jsonString = "";
        String empId = req.getParameter("empId");
        // your operation done here and 
        //convert it to json format before sending response.
        jsonString = gson.toJson("your response convert here to json format"); // here i used google Gson library to convert your response in json format.

        HttpHeaders responseHeaders = new HttpHeaders();
        responseHeaders.add("Content-Type", "text/html; charset=utf-8");
        return new ResponseEntity<String>(jsonString, responseHeaders, HttpStatus.CREATED);
    }