Initial commit

backend/src/main/java/com/maternalmall/common/ApiResponse.java

@@ -0,0 +1,26 @@
+package com.maternalmall.common;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class ApiResponse<T> {
+    private int code;
+    private String message;
+    private T data;
+
+    public static <T> ApiResponse<T> ok(T data) {
+        return new ApiResponse<>(0, "ok", data);
+    }
+
+    public static ApiResponse<Void> ok() {
+        return new ApiResponse<>(0, "ok", null);
+    }
+
+    public static ApiResponse<Void> fail(String message) {
+        return new ApiResponse<>(-1, message, null);
+    }
+}

backend/src/main/java/com/maternalmall/common/BizException.java

@@ -0,0 +1,7 @@
+package com.maternalmall.common;
+
+public class BizException extends RuntimeException {
+    public BizException(String message) {
+        super(message);
+    }
+}

backend/src/main/java/com/maternalmall/common/GlobalExceptionHandler.java

@@ -0,0 +1,32 @@
+package com.maternalmall.common;
+
+import jakarta.validation.ConstraintViolationException;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+
+    @ExceptionHandler(BizException.class)
+    public ApiResponse<Void> handleBiz(BizException ex) {
+        return ApiResponse.fail(ex.getMessage());
+    }
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public ApiResponse<Void> handleValid(MethodArgumentNotValidException ex) {
+        String msg = ex.getBindingResult().getFieldErrors().stream().findFirst()
+                .map(e -> e.getField() + ":" + e.getDefaultMessage()).orElse("参数错误");
+        return ApiResponse.fail(msg);
+    }
+
+    @ExceptionHandler(ConstraintViolationException.class)
+    public ApiResponse<Void> handleConstraint(ConstraintViolationException ex) {
+        return ApiResponse.fail(ex.getMessage());
+    }
+
+    @ExceptionHandler(Exception.class)
+    public ApiResponse<Void> handleUnknown(Exception ex) {
+        return ApiResponse.fail(ex.getMessage());
+    }
+}