英文:
Spring: Error 400 with @RequestBody and JSON
问题
以下是代码部分的翻译：
我有以下的代码部分。当我发送HTTP请求时，我收到一个与carCoordinates字段相关的400错误（如果我删除它，一切正常）。它应该是一个double类型的列表。
另外，当我将carCoordinates的名称更改为carcoordinates而不更改getter的名称时，请求被成功接收，但是我无法获取数据，因为getter与对象没有关联（为null）。如果我将getter的名称更改为getCarcoordinates以匹配该字段，它就不再起作用了。
有任何想法为什么它不起作用？
CarEvent.java：
public class CarEvent {
@JsonProperty("carCoordinates")
protected List<Double> carCoordinates;
...
public void setCarCoordinates(Coordinate c) {
...
}
public List<Double> getCarCoordinates() {
return carCoordinates;
}
}
发送的JSON数据如下：
{
"id": [6001556, 631016236, 125899724],
"speed": "0",
"carCoordinates": [56.477369, 26.64477, 56.466177, 26.651258, 80.545048, 50.614582],
"num": "5"
}
被请求的服务器类是：
@RequestMapping(method = RequestMethod.POST, value = "/car-action", produces = "application/json;charset=UTF-8")
@ResponseBody
public String CarAction(@RequestBody CarEvent requestBody, @RequestHeader HttpHeaders httpHeaders) {
...
}
英文:
I have the following parts of code. When I send the HTTP request, I get an error 400 related to carCoordinates field (if I remove it, everything is fine). It is supposed to be a list of double.
Also, when I change the name carCoordinates to carcoordinates without changing getter name, the request is well received but I can't get the data since getter is not linked with the object (null). If I change the getter name to getCarcoordinates to match the field, it doesn't work anymore.
Any ideas why it does not work?
CarEvent.java :
Public class CarEvent {
@JsonProperty("carCoordinates")
protected List carCoordinates;
...
public void setCarCoordinates(Coordinate c) {
...
}
public List getCarCoordinates() {
return CarCoordinates;
}
}
The JSON sent is :
{
"id": [006001556, 631016236, 125899724],
"speed": "0",
"carCoordinates": [56.477369, 26.64477, 56.466177, 26.651258, 80.545048, 50.614582],
"num": "5"
}
The server class that is requested is:
@RequestMapping(method = RequestMethod.POST, value = "/car-action", produces = "application/json;charset=UTF-8")
@ResponseBody
public String CarAction(@RequestBody CarEvent requestBody, @RequestHeader HttpHeaders httpHeaders) {
...
}
答案1
得分: 2
问题可能出在你的 setter 方法上。你的字段类型是 List，但是 setter 接受的参数类型是 Coordinate 的对象。根据你的 JSON 请求，我认为应该这样修改：
public void setCarCoordinates(List<Coordinate> c) {
this.carCoordinates = c;
}
英文:
The problem probably is your setter method. Your field is of type List but the setter takes in an Object of Coordinate. Based on your json request I think it should be:
public void setCarCoordinates(List c) {
this.carCoordinates = c;
}
答案2
得分: 2
你的CarEvent
具有错误参数的setter方法。
要么创建一个名为Coordinate的类并将其扩展为List，要么按以下方式更新：
public void setCarCoordinates(List cordinates) {
...
}
英文:
Your CarEvent <br>
has setter method with wrong argument.<br>
either create a class Coordinate and extend to List or
Update as below:
public void setCarCoordinates(List cordinates) {
...
}
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