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week9/src/main/java/com/learn/exception/GlobalExceptionHandler.java

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+package com.learn.exception;
+
+import com.learn.dto.ApiResponse;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+
+    private static final Logger log = LoggerFactory.getLogger(GlobalExceptionHandler.class);
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public ResponseEntity<ApiResponse<?>> handleValidation(MethodArgumentNotValidException ex) {
+        var errors = new StringBuilder();
+        for (var error : ex.getBindingResult().getFieldErrors()) {
+            if (!errors.isEmpty()) errors.append("; ");
+            errors.append(error.getField()).append(": ").append(error.getDefaultMessage());
+        }
+        return ResponseEntity.badRequest()
+                .body(ApiResponse.badRequest("参数校验失败: " + errors));
+    }
+
+    @ExceptionHandler(IllegalArgumentException.class)
+    public ResponseEntity<ApiResponse<?>> handleIllegalArgument(IllegalArgumentException ex) {
+        return ResponseEntity.badRequest()
+                .body(ApiResponse.badRequest(ex.getMessage()));
+    }
+
+    @ExceptionHandler(Exception.class)
+    public ResponseEntity<ApiResponse<?>> handleAll(Exception ex) {
+        log.error("Unexpected error", ex);
+        return ResponseEntity.status(500)
+                .body(ApiResponse.error(500, "服务器内部错误: " + ex.getMessage()));
+    }
+}