2016-12-14 120 views
0

我無法以JSON格式從我的jspservlet控制器發送數據。我想,我在調用servlet的ajax時出錯了。下面是我的代碼:無法將「JSON.stringify」數據發送到servlet

JSP

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" 
    pageEncoding="ISO-8859-1"%> 
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> 
<title>Insert title here</title> 
<script src="js/jquery.min.js" type="text/javascript"></script> 
<script> 
var SendInfo=[]; 
$(document).ready(function(){ 
    $("#but").click(function(){ 
     $(".tabclass tr td input[type='checkbox']:checked").each(function(){ 
      var sibs=$(this).parent().siblings("td"); 

      var v0= $(this).val(); 

      var v1=$(sibs[0]).text(); 

      var v2=$(sibs[1]).children("select[name='address']").val(); 

      var domain = { 
        id:v0, 
        name: v1, 
        address: v2 

      } 
      SendInfo.push(domain); 

      alert(v0+" & "+v1+" & "+v2); 

     }); 
     $.ajax({ 
       type: "POST", 
       url: "s1.do", 
       data: JSON.stringify({ students: SendInfo }), // might be wrong here or is it correct way to send data? 
       success: function(data, status){ 
        alert("Data: " + data + "\nStatus: " + status); 
       }, 
       error: function(XMLHttpRequest, textStatus, errorThrown) { 
       alert("some error"); 
       } 
      }); 
    }); 
}); 
</script> 
</head> 
<body> 
<table border="1" class="tabclass"> 
<th>select</th><th>Name</th><th>Address</th> 
<tr> 
<td><input type="checkbox" name="selectCheck" class="select" id="ch1" value="1"/> </td> 
<td><span class="name">Nitin</span></td> 
<td><select name="address"> 
<option>Gurgaon</option> 
<option>Noida</option> 
<option>Rohini</option> 
</select></td> 
</tr> 
<tr> 
<td><input type="checkbox" name="selectCheck" class="select" id="ch2" value="2"/> </td> 
<td><span class="name">Abc</span></td> 
<td><select name="address"> 
<option>Gurgaon</option> 
<option>Noida</option> 
<option>Rohini</option> 
</select></td> 
</tr> 
<tr> 
<td><input type="checkbox" name="selectCheck" class="select" id="ch3" value="3"/> </td> 
<td><span class="name">Xyz</span></td> 
<td><select name="address"> 
<option>Gurgaon</option> 
<option>Noida</option> 
<option>Rohini</option> 
</select></td> 
</tr> 
</table><br><br> 
<button id="but">Test</button> 
<br></br><button id="but2">Test2</button> 
</body> 
</html> 

的Servlet

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
     // TODO Auto-generated method stub 
     String abc = request.getParameter("students"); 
     System.out.println("JSON > "+abc); 
    } 

我收到輸出控制檯:

JSON > null 

回答

-1

的request.getParameter()從中讀取數據URL(查詢參數)或表單發佈參數(application/x-www-form-urlencoded,multipart/form-data content type)。

如果您發佈JSON,您必須從servlet的inputStream(request.getInputStream)中讀取它並解析字符串。

+0

我可以用request.getParameter如果我使用AJAX的'$ .post'方式接收數據()方法。我想問,爲什麼這種行爲不可能用於'$ .ajax' – JPG

0

我只是需要改變元素調用ajaxdata

data: {students : JSON.stringify(SendInfo)},