企业官网建设流程全解析

推荐坪山网站建设,新洲网站建设,嘉兴网站建设网站,制作网页多少钱一、最简版本#xff08;适合新手#xff09;import lombok.Getter;/*** 业务异常 - 最简单版本*/ Getter public class BusinessException extends RuntimeException {private final Integer code; // 错误码// 构造方法1#xff1a;指定错误码和消息public BusinessExcep…一、最简版本适合新手import lombok.Getter; /** * 业务异常 - 最简单版本 */ Getter public class BusinessException extends RuntimeException { private final Integer code; // 错误码 // 构造方法1指定错误码和消息 public BusinessException(Integer code, String message) { super(message); this.code code; } // 构造方法2只传消息默认500错误码 public BusinessException(String message) { this(500, message); } }二、稍微丰富版本推荐import lombok.Getter; /** * 业务异常 - 常用版本 */ Getter public class BusinessException extends RuntimeException { private final Integer code; // 常用状态码定义 public static final Integer BAD_REQUEST 400; // 请求参数错误 public static final Integer UNAUTHORIZED 401; // 未授权 public static final Integer FORBIDDEN 403; // 禁止访问 public static final Integer NOT_FOUND 404; // 资源不存在 // 常用构造方法 public BusinessException(Integer code, String message) { super(message); this.code code; } public BusinessException(String message) { this(500, message); } // 快速创建方法静态工厂方法 public static BusinessException badRequest(String message) { return new BusinessException(BAD_REQUEST, message); } public static BusinessException notFound(String resourceName) { return new BusinessException(NOT_FOUND, resourceName 不存在); } public static BusinessException forbidden() { return new BusinessException(FORBIDDEN, 无权限访问); } }三、配合枚举使用// 1. 先定义错误枚举 Getter public enum ErrorCode { SUCCESS(200, 成功), PARAM_ERROR(400, 参数错误), UNAUTHORIZED(401, 未登录), FORBIDDEN(403, 无权限), NOT_FOUND(404, 资源不存在), USER_NOT_FOUND(40401, 用户不存在), SYSTEM_ERROR(500, 系统错误); private final Integer code; private final String message; ErrorCode(Integer code, String message) { this.code code; this.message message; } } // 2. 修改异常类 Getter public class BusinessException extends RuntimeException { private final Integer code; // 使用枚举构造 public BusinessException(ErrorCode errorCode) { super(errorCode.getMessage()); this.code errorCode.getCode(); } // 自定义消息 public BusinessException(ErrorCode errorCode, String customMessage) { super(customMessage); this.code errorCode.getCode(); } }四、实际使用例子Service public class UserService { public User getUserById(Long id) { User user userRepository.findById(id); // 情况1直接抛异常 if (user null) { throw new BusinessException(404, 用户不存在); } // 情况2使用快速方法 if (user.getStatus() 0) { throw BusinessException.forbidden(); } // 情况3使用枚举 if (user.getBalance() 0) { throw new BusinessException(ErrorCode.PARAM_ERROR, 余额不能为负); } return user; } public void transfer(Long fromId, Long toId, BigDecimal amount) { // 使用连串校验 User fromUser userRepository.findById(fromId) .orElseThrow(() - new BusinessException(ErrorCode.USER_NOT_FOUND)); if (fromUser.getBalance().compareTo(amount) 0) { throw new BusinessException(400, 余额不足); } // 业务逻辑... } }五、全局异常处理RestControllerAdvice public class GlobalExceptionHandler { ExceptionHandler(BusinessException.class) public Result? handleBusinessException(BusinessException e) { // 统一返回格式 return Result.error(e.getCode(), e.getMessage()); } ExceptionHandler(Exception.class) public Result? handleOtherException(Exception e) { // 其他异常 log.error(系统异常, e); return Result.error(500, 系统异常); } } // 统一返回结果 Data class ResultT { private Integer code; private String message; private T data; public static T ResultT success(T data) { ResultT result new Result(); result.code 200; result.message 成功; result.data data; return result; } public static T ResultT error(Integer code, String message) { ResultT result new Result(); result.code code; result.message message; return result; } }六、总结要点最简写法记住这个就行public class BusinessException extends RuntimeException { private Integer code; public BusinessException(Integer code, String message) { super(message); this.code code; } }使用三部曲定义异常类上面代码在需要的地方抛出if (条件不满足) { throw new BusinessException(400, 错误信息); }全局处理返回统一格式记住几个常用错误码400参数错误401未登录403无权限404不存在500系统错误