spring-boot如何基于Jax-RS响应Httpstatus在try块中引发多个自定义异常

Question

我有这样的东西：

@ResponseStatus(value = HttpStatus.UNAUTHORIZED)
public class MyCustomExceptionA extends RuntimeException {
    public MyCustomExceptionA(String message)  {
        super(message);
    }
}
@ResponseStatus(value = HttpStatus.NOT_FOUND)
public class MyCustomExceptionB extends RuntimeException {
    public MyCustomExceptionA(String message){
        super(message);
    }
}
@ResponseStatus(value = HttpStatus.BAD_REQUEST)
public class MyCustomExceptionC extends RuntimeException {
    public MyCustomExceptionA(String message)  {
        super(message);
    }
}
@ControllerAdvice
public class SomeClass  {
    @ExceptionHandler(MyCustomExceptionA.class)
    public ResponseEntity<ExceptionResponse> method1(MyCustomExceptionA  ex){
        ExceptionResponse response = new ExceptionResponse(401, ex.getMessage())
    return new ResponseEntity<>(response, HttpStatus.UNAUTHORIZED);
  }

  method2 for MyCustomExceptionB

  method3 for MyCustomExceptionC
}

我正在进行Jax-RS休息电话以获取响应

try{
    Response response = ClientBuilder.newCLient().target("someURL").path("somePath").get();

    if (response.getStatus() == 400){
        throw new MyCustomExceptionB("some Error message") <-- this don't get thrown
    }else if (response.getStatus() == 401){
        throw new MyCustomExceptionA("some Error message") <-- this don't get thrown
    }else if (response.getStatus() == 404){
        throw new MyCustomExceptionC("some Error message")  <-- this don't get thrown   
}catch(Exception ex){
    log.error("something happened ....")
    throw new Exception("message")                  <-- this overrides above exceptions
}

当我尝试抛出400、401或404的自定义异常时，它仍然从catch块中抛出异常。为什么？我调试了它，然后转到相应的状态码（400、401或404），但最后仍然会从catch块抛出Exception->我在做什么错了!!

Answer 1

catch块捕获try块中的代码引发的异常。这就是为什么在if else链中抛出异常之后运行catch块中的代码的原因。

我建议您在进行Spring Boot之前熟悉异常的基本知识。

try{
  //potentially dangerous code here.
}catch(Exception ex){
  //Catches all Exceptions thrown in try block.
  //Handle ex.
}