英文:
How to catch Bad Request in Spring Boot
问题
以下是您提供的内容的中文翻译：
我正在创建一个简单的REST服务，可以在用户上执行CRUD操作。
要创建用户，我编写了以下函数：
@PostMapping(path = "/new")public @ResponseBody ResponseEntity<User> createUser(@RequestParam String name, @RequestParam String email, @RequestParam String password, @RequestParam String platform, @RequestParam String platformID, @RequestParam String wishlist) {if(name != "" && email != "" && password != "" && platform != "" && platformID != "" && wishlist != "") {User user = new User(name, email, password, platform, platformID, wishlist);User result = userRepository.save(user);return new ResponseEntity<User>(result, HttpStatus.CREATED);}return new ResponseEntity("无法添加用户，因为信息不完整", HttpStatus.CONFLICT);}
如您所见，我在请求参数中提供了用户信息。我希望在请求的URL中有参数缺失时执行函数的底部代码。然而，当参数缺失时，我会自动收到“Bad Request”HTTP错误。是否有人知道如何捕获这样的错误或更改其中的文本？
英文:
I'm creating a simple REST Service where I can do crud operations over users.
For creating users, I wrote the following function:
public @ResponseBody ResponseEntity<User> createUser(@RequestParam String name, @RequestParam String email, @RequestParam String password, @RequestParam String platform, @RequestParam String platformID, @RequestParam String wishlist) {if(name != "" && email != "" && password != "" && platform != "" && platformID != "" && wishlist != "") {User user = new User(name, email, password, platform, platformID, wishlist);User result = userRepository.save(user);return new ResponseEntity<User>(result, HttpStatus.CREATED);}return new ResponseEntity("The user can not be added because it is not complete", HttpStatus.CONFLICT);}
As you see, I provide the user info in the request parameters. I want to have it so that if there is a parameter missing in the requested URL, the bottom line of the function is executed. However, when parameters are missing I automatically get back a Bad Request http error. Does anybody know how to catch such an error or change the text in it?
答案1
得分: 0
默认情况下，@RequestParam 是必需的（属性 required = true）。您可以这样做：@RequestParam(required = false)。
更新1：我还注意到您在使用 != 来比较字符串。您应该使用类似这样的方式：user != null && !user.equals("")。
英文:
by default @RequestParam is required (property required = true). You can do something like this @RequestParam(required = false)
UPDATE 1: I also notice that you use != to compare string. you have to use something like user != null && !user.eqauls("")
答案2
得分: 0
我更喜欢使用 @ControllerAdvice/@RestControllerAdvice
它允许您在整个应用程序范围内处理异常，并且您可以从此处理程序自定义向客户端发送的响应。将其视为一种拦截器。
请检查以下代码示例
@RestControllerAdvicepublic class ErrorHandler {@ExceptionHandler(value = IllegalArgumentException.class)public ResponseEntity<ErrorResponse> illegalArgumentExceptionHandler(IllegalArgumentException e) {// ErrorResponse是自定义响应模型return new ResponseEntity<>(new ErrorResponse(ErrorCode.NOT_FOUND, e.getMessage()), HttpStatus.NOT_ACCEPTABLE);}}
英文:
I prefer use @ControllerAdvice/@RestControllerAdvice
It allows you to handle exceptions across the whole application and you can customize the response to your client from this handler. Think this as a kind of interceptor.
Please check the following sample code snippet
@RestControllerAdvicepublic class ErrorHandler {@ExceptionHandler(value = IllegalArgumentException.class)public ResponseEntity<ErrorResponse> illegalArgumentExceptionHandler(IllegalArgumentException e) {//ErrorResponse is the custom response modelreturn new ResponseEntity<>(new ErrorResponse(ErrorCode.NOT_FOUND, e.getMessage()), HttpStatus.NOT_ACCEPTABLE);}}
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