Spring MVC @RestController -> 无论我做什么,PUTting 都会导致“400 Bad Request”
Spring MVC @RestController -> PUTting results in "400 Bad Request" no matter what I do
我有一个 Spring RestController,当我 GET
来自它的数据时它工作得很好,但是当我尝试 PUT
非常相同的数据时 , 我得到一个 400 Bad Request
.
这是我的控制器的最简单版本,应该 仍然有效(我省略了 GET
方法):
@RestController
@RequestMapping("/configuration/ledstrips/{name}/display")
public class DisplayController {
@ResponseBody
@RequestMapping(method = RequestMethod.PUT, produces = { "application/hal+json" })
public DisplayResource setDisplay(@PathVariable String name, @RequestBody DisplayResource display) {
return display;
}
}
这是DisplayResource
:
public class DisplayResource extends ResourceSupport {
private List<Color> pixels;
public List<Color> getPixels() {
return pixels;
}
public void setPixels(List<Color> pixels) {
this.pixels = pixels;
}
}
我几乎是从另一个分支复制这段代码,并且它有效!
想不通!
编辑
这是 GET
-方法:
@ResponseBody
@RequestMapping(method = RequestMethod.GET, produces = { "application/hal+json" })
public DisplayResource getDisplay(@PathVariable String name) {
LEDStripDTO ledStripDTO;
try {
ledStripDTO = ledStripDTOService.getDTO(name);
} catch (IOException | NullPointerException exception) {
throw new LoadFailedException("Error loading LED strip:", exception);
}
Link self = linkTo(methodOn(DisplayController.class).getDisplay(name)).withSelfRel();
DisplayResource displayResource = new DisplayResource();
displayResource.add(self);
try {
displayResource.setPixels(ledStripService.getPixels(ledStripDTO));
} catch (IOException | TimeoutException | AlreadyConnectedException | NotConnectedException exception) {
throw new LoadFailedException("Error getting Information from LED strip:", exception);
}
return displayResource;
}
它产生的结果(对于长度为 1 的 LED 灯条):
{
"pixels": [
{
"red": 0,
"green": 16,
"blue": 0
}
],
"_links": {
"self": {
"href": "http://localhost:8080/configuration/ledstrips/devled/display"
}
}
}
当我发送此邮件时,无论有无 _links
段,我都会收到 400
错误。
因为它是 PUT
,所以您定义了 produces
而不是 consumes
。可能是端点不知道期望正文采用什么格式,这就是它拒绝它的原因。尝试:
查看了您提供的源代码后,我发现 Color
class 有一个需要参数的构造函数。由于此构造函数,Jackson 库提供的默认 ObjectMapper
将无法解组 JSON 字符串。尝试将默认构造函数添加到 Color
class 以及当前构造函数:
public Color(int red, int green, int blue) {
this.red = setColorLimits(red);
this.green = setColorLimits(green);
this.blue = setColorLimits(blue);
}
public Color() {}
我有一个 Spring RestController,当我 GET
来自它的数据时它工作得很好,但是当我尝试 PUT
非常相同的数据时 , 我得到一个 400 Bad Request
.
这是我的控制器的最简单版本,应该 仍然有效(我省略了 GET
方法):
@RestController
@RequestMapping("/configuration/ledstrips/{name}/display")
public class DisplayController {
@ResponseBody
@RequestMapping(method = RequestMethod.PUT, produces = { "application/hal+json" })
public DisplayResource setDisplay(@PathVariable String name, @RequestBody DisplayResource display) {
return display;
}
}
这是DisplayResource
:
public class DisplayResource extends ResourceSupport {
private List<Color> pixels;
public List<Color> getPixels() {
return pixels;
}
public void setPixels(List<Color> pixels) {
this.pixels = pixels;
}
}
我几乎是从另一个分支复制这段代码,并且它有效!
想不通!
编辑
这是 GET
-方法:
@ResponseBody
@RequestMapping(method = RequestMethod.GET, produces = { "application/hal+json" })
public DisplayResource getDisplay(@PathVariable String name) {
LEDStripDTO ledStripDTO;
try {
ledStripDTO = ledStripDTOService.getDTO(name);
} catch (IOException | NullPointerException exception) {
throw new LoadFailedException("Error loading LED strip:", exception);
}
Link self = linkTo(methodOn(DisplayController.class).getDisplay(name)).withSelfRel();
DisplayResource displayResource = new DisplayResource();
displayResource.add(self);
try {
displayResource.setPixels(ledStripService.getPixels(ledStripDTO));
} catch (IOException | TimeoutException | AlreadyConnectedException | NotConnectedException exception) {
throw new LoadFailedException("Error getting Information from LED strip:", exception);
}
return displayResource;
}
它产生的结果(对于长度为 1 的 LED 灯条):
{
"pixels": [
{
"red": 0,
"green": 16,
"blue": 0
}
],
"_links": {
"self": {
"href": "http://localhost:8080/configuration/ledstrips/devled/display"
}
}
}
当我发送此邮件时,无论有无 _links
段,我都会收到 400
错误。
因为它是 PUT
,所以您定义了 produces
而不是 consumes
。可能是端点不知道期望正文采用什么格式,这就是它拒绝它的原因。尝试:
查看了您提供的源代码后,我发现 Color
class 有一个需要参数的构造函数。由于此构造函数,Jackson 库提供的默认 ObjectMapper
将无法解组 JSON 字符串。尝试将默认构造函数添加到 Color
class 以及当前构造函数:
public Color(int red, int green, int blue) {
this.red = setColorLimits(red);
this.green = setColorLimits(green);
this.blue = setColorLimits(blue);
}
public Color() {}