初始化项目

backend/src/main/com/bycrm/exception/BusinessException.java

@@ -0,0 +1,27 @@
+package com.bycrm.exception;
+
+import lombok.Getter;
+
+/**
+ * 业务异常
+ */
+@Getter
+public class BusinessException extends RuntimeException {
+
+    private final Integer code;
+
+    public BusinessException(String message) {
+        super(message);
+        this.code = 500;
+    }
+
+    public BusinessException(Integer code, String message) {
+        super(message);
+        this.code = code;
+    }
+
+    public BusinessException(String message, Throwable cause) {
+        super(message, cause);
+        this.code = 500;
+    }
+}