java - 异常处理状态码

Question

在我的项目中，使用类似下面的方法创建了异常处理。我的意思是我们确实在某些服务层中throw new GeekAlreadyExistsException()，最后会返回一些错误响应(取决于错误代码)。

public interface ErrorCode {

    String code();

    HttpStatus httpStatus();

}

enum GeeksApiErrorCodes implements ErrorCode {
    GEEK_ALREADY_EXISTS("geeks-1", HttpStatus.BAD_REQUEST);

    private final String code;
    private final HttpStatus httpStatus;

    GeeksApiErrorCodes(String code, HttpStatus httpStatus) {
        this.code = code;
        this.httpStatus = httpStatus;
    }

    @Override
    public String code() {
        return code;
    }

    @Override
    public HttpStatus httpStatus() {
        return httpStatus;
    }
}

Answer 1

我建议让异常知道它自己的错误代码，例如像这样:

public abstract class ApplicationException extends RuntimeException {

    protected ApplicationException() {
        super();
    }
    protected ApplicationException(String message) {
        super(message);
    }
    protected ApplicationException(Throwable cause) {
        super(cause);
    }
    protected ApplicationException(String message, Throwable cause) {
        super(message, cause);
    }

    public abstract String getErrorCode();

    public abstract HttpStatus getHttpStatus();

}

public class GeekAlreadyExistsException extends ApplicationException {
    private static final long serialVersionUID = 1L;

    public GeekAlreadyExistsException() {
        super();
    }

    public GeekAlreadyExistsException(String message) {
        super(message);
    }

    public GeekAlreadyExistsException(String message, Throwable cause) {
        super(message, cause);
    }

    @Override
    public String getErrorCode() {
        return "geeks-1";
    }

    @Override
    public HttpStatus getHttpStatus() {
        return HttpStatus.BAD_REQUEST;
    }

}

---

如果您不想要每个异常一个错误代码的约束，您可以改为在构造函数调用上传递错误代码。

这仍然允许一些专门的子类异常对错误代码进行硬编码，因此调用者无法指定它。

public class ApplicationException extends RuntimeException {
    private static final long serialVersionUID = 1L;

    private final String errorCode;

    private final HttpStatus httpStatus;

    public ApplicationException(String errorCode, HttpStatus httpStatus) {
        super();
        this.errorCode = errorCode;
        this.httpStatus = httpStatus;
    }
    public ApplicationException(String errorCode, HttpStatus httpStatus, String message) {
        super(message);
        this.errorCode = errorCode;
        this.httpStatus = httpStatus;
    }
    public ApplicationException(String errorCode, HttpStatus httpStatus, Throwable cause) {
        super(cause);
        this.errorCode = errorCode;
        this.httpStatus = httpStatus;
    }
    public ApplicationException(String errorCode, HttpStatus httpStatus, String message, Throwable cause) {
        super(message, cause);
        this.errorCode = errorCode;
        this.httpStatus = httpStatus;
    }

    public final String getErrorCode() {
        return this.errorCode;
    }

    public final HttpStatus getHttpStatus() {
        return this.httpStatus;
    }

}

public class GeekAlreadyExistsException extends ApplicationException {
    private static final long serialVersionUID = 1L;

    public GeekAlreadyExistsException() {
        super("geeks-1", HttpStatus.BAD_REQUEST);
    }

    public GeekAlreadyExistsException(String message) {
        super("geeks-1", HttpStatus.BAD_REQUEST, message);
    }

    public GeekAlreadyExistsException(String message, Throwable cause) {
        super("geeks-1", HttpStatus.BAD_REQUEST, message, cause);
    }

}