异常处理状态码

Question

在我的项目中，使用下面的方法创建了异常处理。我的意思是，我们在某些服务层中抛出新的()，最后将返回一些错误响应(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

我建议让异常知道自己的错误代码，例如：

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;
    }

}

如果您不需要一个错误代码-每个异常约束，则可以将错误代码传递给构造函数调用。

这仍然允许一些特殊的子类异常硬编码错误代码，因此调用方无法指定它。

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);
    }

}

Answer 2

用新的异常类映射每个错误代码不是一个好的解决方案。如果将来需要更多的错误代码，则必须创建更多的类。因此，更好的解决方案是只在创建/抛出异常时填充错误代码。详情如下：

package test.file;

public class MyException extends RuntimeException {

  /**
   *
   */
  private static final long serialVersionUID = 1L;

  //The error code
  private final String errorCode;

  //The error message corresponding to the error code. Resolved on the basis of the Locale
  private final HttpStatus httpStatus;

  public MyException(final String errorCode, final HttpStatus httpStatus) {
    this.errorCode = errorCode;
    this.httpStatus = httpStatus;
  }

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

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

  /**
   * Method will return error code.
   *
   * @return
   */
  public String getErrorCode() {
    return errorCode;
  }

  /**
   * @return the httpStatus
   */
  public HttpStatus getHttpStatus() {
    return httpStatus;
  }

}

在这里，您可以直接检索errorCode并执行适当的操作。这将满足你的要求，你刚才提到的问题。这将是您的问题的最简单的解决方案。