修改预约业务失败应该抛异常，而不是正常返回

src/main/java/com/soecode/lyf/exception/AppointException.java

@@ -0,0 +1,16 @@
+package com.soecode.lyf.exception;
+
+/**
+ * 预约业务异常
+ */
+public class AppointException extends RuntimeException {
+
+ public AppointException(String message) {
+ super(message);
+ }
+
+ public AppointException(String message, Throwable cause) {
+ super(message, cause);
+ }
+
+}

src/main/java/com/soecode/lyf/exception/NoNumberException.java

@@ -0,0 +1,16 @@
+package com.soecode.lyf.exception;
+
+/**
+ * 库存不足异常
+ */
+public class NoNumberException extends RuntimeException {
+
+ public NoNumberException(String message) {
+ super(message);
+ }
+
+ public NoNumberException(String message, Throwable cause) {
+ super(message, cause);
+ }
+
+}

src/main/java/com/soecode/lyf/exception/RepeatAppointException.java

@@ -0,0 +1,16 @@
+package com.soecode.lyf.exception;
+
+/**
+ * 重复预约异常
+ */
+public class RepeatAppointException extends RuntimeException {
+
+ public RepeatAppointException(String message) {
+ super(message);
+ }
+
+ public RepeatAppointException(String message, Throwable cause) {
+ super(message, cause);
+ }
+
+}

src/main/java/com/soecode/lyf/service/impl/BookServiceImpl.java

@@ -14,6 +14,9 @@
 import com.soecode.lyf.entity.Appointment;
 import com.soecode.lyf.entity.Book;
 import com.soecode.lyf.enums.AppointStateEnum;
+import com.soecode.lyf.exception.AppointException;
+import com.soecode.lyf.exception.NoNumberException;
+import com.soecode.lyf.exception.RepeatAppointException;
 import com.soecode.lyf.service.BookService;
 
 @Service
@@ -51,21 +54,25 @@ public AppointExecution appoint(long bookId, long studentId) {
  // 减库存
  int update = bookDao.reduceNumber(bookId);
  if (update <= 0) {// 库存不足
- return new AppointExecution(bookId, AppointStateEnum.NO_NUMBER);
+ throw new NoNumberException("no number");
  } else {
  // 执行预约操作
  int insert = appointmentDao.insertAppointment(bookId, studentId);
  if (insert <= 0) {// 重复预约
- return new AppointExecution(bookId, AppointStateEnum.REPEAT_APPOINT);
+ throw new RepeatAppointException("repeat appoint");
  } else {// 预约成功
  Appointment appointment = appointmentDao.queryByKeyWithBook(bookId, studentId);
  return new AppointExecution(bookId, AppointStateEnum.SUCCESS, appointment);
  }
  }
+ } catch (NoNumberException e1) {
+ throw e1;
+ } catch (RepeatAppointException e2) {
+ throw e2;
  } catch (Exception e) {
  logger.error(e.getMessage(), e);
  // 所有编译期异常转换为运行期异常
- return new AppointExecution(bookId, AppointStateEnum.INNER_ERROR);
+ throw new AppointException("appoint inner error:" + e.getMessage());
  }
  }
 

src/main/java/com/soecode/lyf/web/BookController.java

@@ -16,6 +16,9 @@
 import com.soecode.lyf.dto.AppointExecution;
 import com.soecode.lyf.dto.Result;
 import com.soecode.lyf.entity.Book;
+import com.soecode.lyf.enums.AppointStateEnum;
+import com.soecode.lyf.exception.NoNumberException;
+import com.soecode.lyf.exception.RepeatAppointException;
 import com.soecode.lyf.service.BookService;
 
 @Controller
@@ -56,7 +59,16 @@ private Result<AppointExecution> appoint(@PathVariable("bookId") Long bookId, @P
  if (studentId == null || studentId.equals("")) {
  return new Result<>(false, "学号不能为空");
  }
- AppointExecution execution = bookService.appoint(bookId, studentId);
+ AppointExecution execution = null;
+ try {
+ execution = bookService.appoint(bookId, studentId);
+ } catch (NoNumberException e1) {
+ execution = new AppointExecution(bookId, AppointStateEnum.NO_NUMBER);
+ } catch (RepeatAppointException e2) {
+ execution = new AppointExecution(bookId, AppointStateEnum.REPEAT_APPOINT);
+ } catch (Exception e) {
+ execution = new AppointExecution(bookId, AppointStateEnum.INNER_ERROR);
+ }
  return new Result<AppointExecution>(true, execution);
  }