[英]Java class receives Ajax JSON post as null
我正在嘗試使用ajax post方法將json數據發送到Java類。 當我硬編碼一個json字符串時,我的Java對象就可以了,但是當我嘗試發送使用JSON.stringify()創建的json字符串時,我在控制器中得到了所有null。
這是流程,我在html中有下表:
<table class="table" id="internalUnsubmittedPartRequests">
<thead>
<tr>
<th id="partID">partID</th>
<th id="quantity">quantity</th>
<th id="applicableModel">applicableModel</th>
<th id="queueName">queueName</th>
<th id="issueType">issueType</th>
<th id="controlCode">controlCode</th>
<th id="position">position</th>
<th id="command">command</th>
<th id="activationDate">activationDate</th>
<th id="flushDate">flushDate</th>
</tr>
</thead>
<tbody>
<!-- Dynamically Generated via newRequest.js -->
</tbody>
</table>
以及以下從該表讀取的javascript,並使用ajax將其發送到我的控制器:
$('#submit_set_btn').click(function(event) {
var myRows = [];
var $headers = $("th");
var $rows = $("#internalUnsubmittedPartRequests tr").each(function(index) {
$cells = $(this).find("td");
myRows[index] = {};
$cells.each(function(cellIndex) {
myRows[index][$($headers[cellIndex]).html()] = $(this).html();
});
});
myRows.shift();
var myObj = {};
myObj.myrows = myRows;
console.log(JSON.stringify(myObj));
$.ajax({
type : "POST",
// contentType : "application/json; charset=utf-8",
url : window.location,
data : JSON.stringify(myObj),
dataType : 'json',
success : function(result) {
//alert("success");
console.log("success");
console.log(result);
},
error : function(e) {
//alert("fail");
console.log("fail");
console.log(e);
}
});
});
在console.log(JSON.stringify(myObj))調用期間,將以下內容打印到控制台:
{"myrows":[{"partID":"data","quantity":"data","applicableModel":"data","queueName":"data","issueType":"data","controlCode":"data","position":"data","command":"data","activationDate":"data","flushDate":"data"}]}
這是代表我要創建的對象的Java類:
public class NewPartRequest
{
private String partID;
private String quantity;
private String applicableModel;
private String queueName;
private String issueType;
private String controlCode;
private String position;
private String command;
private String activationDate;
private String flushDate;
@Override
public String toString() {
return getPartID() + " " + getQuantity() + " " + getApplicableModel() + " " +
getQueueName() + " " + getIssueType() + " " + getCommand() + " " +
getActivationDate() + " " + getFlushDate();
}
//Getters and Setters below this line
最后,控制器類接收JSON數據並使用toString方法顯示我們得到的結果:
@Controller
public class DistributionNewRequestController {
@RequestMapping(value = "/distribution/internal/unsubmitted/new-request", method = { RequestMethod.GET })
public String newRequest() {
return "new-request";
}
@RequestMapping(value = "/distribution/internal/unsubmitted/new-request", method = {
RequestMethod.POST }, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
public @ResponseBody String internalRequestPost(@RequestBody NewPartRequest newPartRequest) {
System.out.println("The new part request toString method: ");
System.out.println(newPartRequest.toString());
String response = jsonify(newPartRequest);
return response;
}
private String jsonify(NewPartRequest in) {
Gson gson = new Gson();
String out = gson.toJson(in);
return out;
}
}
在我們的NewPartRequest newPartRequest對象上調用toString()方法,並打印以下內容:
The new part request toString method:
null null null null null null null null
我已經在這個問題上困擾了很長時間,我無法弄清楚為什么我所有屬性的值都為null。
您需要更改ajax帖子,如下所示
data : JSON.stringify(myObj.myrows[0]),
或者您可以像這樣更改后端代碼
List<NewPartRequest>
然后從如下所示的ajax傳遞
data : JSON.stringify(myObj.myrows),
您實際上是在傳遞對象列表,並且期望在后端控制器方法中使用單個對象。
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