凡操作失敗都應該拋出某種異常，為了便于管理自定義的異常，應該先創建這些異常的基類，在創建異常要生成【無參構造】方法，如下一樣：
快捷鍵是：
代碼區域->右鍵->source->GenerateConstructors from Supperclass…無參數構造方法alt+shift+s+c

//ServiceException.凡操作失敗都應該拋出某種異常，為了便于管理自定義的異常，應該先創建這些異常的基類 public class ServiceException extends RuntimeException {private static final long serialVersionUID = -2879099986352308425L;public ServiceException() {super();}public ServiceException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {super(message, cause, enableSuppression, writableStackTrace);}public ServiceException(String message, Throwable cause) {super(message, cause);}public ServiceException(String message) {super(message);}public ServiceException(Throwable cause) {super(cause);} } //UsernameDuplicateException 本次“注冊”之前，需要先檢查用戶名是否已經被占用，如果已經被占用，則需要拋出“用戶名被占用”的異常 public class UsernameDuplicateException extends ServiceException {private static final long serialVersionUID = 3164055183124220212L;public UsernameDuplicateException() {super();}public UsernameDuplicateException(String message, Throwable cause, boolean enableSuppression,boolean writableStackTrace) {super(message, cause, enableSuppression, writableStackTrace);}public UsernameDuplicateException(String message, Throwable cause) {super(message, cause);}public UsernameDuplicateException(String message) {super(message);}public UsernameDuplicateException(Throwable cause) {super(cause);} } //本次“注冊”之前，需要先檢查用戶名是否已經被占用，如果已經被占用，則需要拋出“用戶名被占用”的異常 public class InsertException extends ServiceException{/*** */private static final long serialVersionUID = 878421569126542322L;public InsertException() {super();}public InsertException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {super(message, cause, enableSuppression, writableStackTrace);}public InsertException(String message, Throwable cause) {super(message, cause);}public InsertException(String message) {super(message);}public InsertException(Throwable cause) {super(cause);} } public class UserNotFoundException extends ServiceException{/*** 此次執行修改之前，需要檢查用戶數據是否存在，及是否被標記為“已刪除”，則可能拋出UserNotFoundException；*/private static final long serialVersionUID = 129945205934194859L;public UserNotFoundException() {super();}public UserNotFoundException(String message, Throwable cause, boolean enableSuppression,boolean writableStackTrace) {super(message, cause, enableSuppression, writableStackTrace);}public UserNotFoundException(String message, Throwable cause) {super(message, cause);}public UserNotFoundException(String message) {super(message);}public UserNotFoundException(Throwable cause) {super(cause);}} public class PasswordNotMatchException extends ServiceException{/*** 在執行修改之前，還會檢查原密碼是否正確，如果原密碼錯誤，則可能拋出PasswordNotMatchException；*/private static final long serialVersionUID = 7750209971477940813L;public PasswordNotMatchException() {super();}public PasswordNotMatchException(String message, Throwable cause, boolean enableSuppression,boolean writableStackTrace) {super(message, cause, enableSuppression, writableStackTrace);}public PasswordNotMatchException(String message, Throwable cause) {super(message, cause);}public PasswordNotMatchException(String message) {super(message);}public PasswordNotMatchException(Throwable cause) {super(cause);} } public class UpdateException extends ServiceException{/*** 在執行修改時，執行的是Update類型的操作，則可能拋出UpdateException*/private static final long serialVersionUID = 6612586132242913331L;public UpdateException() {super();}public UpdateException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {super(message, cause, enableSuppression, writableStackTrace);}public UpdateException(String message, Throwable cause) {super(message, cause);}public UpdateException(String message) {super(message);}public UpdateException(Throwable cause) {super(cause);} }

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