核心内容摘要
5分钟教程：用Banana Vision Studio制作极简说明书风格图
作为一名后端开发你是否遇到过这样的场景运营同学说双11活动规则临时调整满300减60改成满200减50能马上上线吗产品经理说风控策略需要微调一下这个规则能不能今晚就生效老板说竞品降价了我们的VIP折扣也要调整最好现在就能改每次遇到这种情况我们都要修改代码 → 重新打包 → 发布部署 → 重启服务。
这个流程短则半小时长则几个小时错过最佳时机不说还要承担发布风险。
今天我们来聊聊如何用动态规则引擎解决这个痛点01业务痛点规则变更的老大难问题传统方式的困境// 硬编码修改需要重新发布 if (GOLD.equals(userLevel) amount
{ return amount *
8; }在传统的业务系统中业务规则通常硬编码在业务逻辑中// 传统的硬编码方式 public BigDecimal calculateVipDiscount(String userLevel, BigDecimal price) { if (GOLD.equals(userLevel)) { return price.multiply(new BigDecimal(
0.
); // 8折 } else if (SILVER.equals(userLevel)) { return price.multiply(new BigDecimal(
0.
); // 9折 } return price; // 无折扣 }这种方式存在诸多问题响应慢规则变更需要完整的开发流程风险高每次发布都可能影响整个系统成本大需要开发、测试、运维多方配合不灵活无法快速响应市场变化真实的业务场景电商行业• 每逢大促活动优惠规则频繁调整• A/B测试需要不同的定价策略• 竞品价格变动需要快速跟进金融行业• 风控模型需要根据市场情况实时调整• 利率政策变化需要快速响应• 审核规则需要根据业务发展动态优化内容平台• 推荐算法需要不断优化• 内容审核规则需要及时更新• 用户等级体系需要灵活调整02解决方案动态规则引擎核心思路动态规则引擎的本质是将业务规则与业务代码分离业务代码负责流程控制和数据处理业务规则以脚本形式独立存储运行时动态执行技术选型本演示DEMO我选择了以下技术栈规则引擎QLExpress - 阿里开源后端框架Spring Boot - 快速开发前端技术HTML5 TailwindCSS03核心实现手把手搭建动态规则引擎项目结构设计springboot-dynamic-rule/ ├── entity/ │ ├── RuleScript.java # 规则实体 │ ├── OrderProcessResult.java # 订单处理结果 │ └── RuleExecuteResponse.java # 规则执行响应 ├── service/ │ ├── DynamicRuleEngine.java # 规则引擎核心 │ └── OrderService.java # 业务服务 ├── controller/ │ ├── RuleController.java # 规则管理API │ └── OrderController.java # 业务API └── resources/ └── static/ ├── index.html # 规则管理页面 └── business.html # 业务演示页面规则引擎核心实现Slf4j Service public class DynamicRuleEngine { // 内存存储规则实际项目可使用数据库 private final MapString, RuleScript ruleCache new ConcurrentHashMap(); private final ExpressRunner expressRunner new ExpressRunner(); PostConstruct public void init() { initDefaultRules(); } private void initDefaultRules() { // VIP折扣规则 addRule(new RuleScript(vip_discount, if (userLevel \GOLD\) { return price *
8; } else if (userLevel \SILVER\) { return price *
9; } else { return price; }, VIP用户折扣规则)); // 满减活动规则 addRule(new RuleScript(full_reduction, if (totalAmount
{ return totalAmount - 50; } else if (totalAmount
{ return totalAmount - 20; } else { return totalAmount; }, 满减活动规则)); } public RuleExecuteResponse executeRule(String ruleName, MapString, Object params) { try { RuleScript rule ruleCache.get(ruleName); if (rule null || !rule.isEnabled()) { return RuleExecuteResponse.error(规则不存在或已禁用: ruleName); } DefaultContextString, Object context new DefaultContext(); if (params ! null) { params.forEach(context::put); } Object result expressRunner.execute(rule.getScript(), context, null, true, false); log.info(执行规则: {}, 结果: {}, ruleName, result); return RuleExecuteResponse.success(result); } catch (Exception e) { log.error(执行规则失败: {}, ruleName, e); return RuleExecuteResponse.error(执行失败: e.getMessage()); } } }业务服务集成Service RequiredArgsConstructor public class OrderService { private final DynamicRuleEngine ruleEngine; public OrderProcessResult processOrder(Order order) { ListOrderProcessResult.ProcessStep steps new ArrayList(); BigDecimal currentAmount order.getOriginalAmount(); //
应用VIP折扣规则 BigDecimal discountedAmount applyVipDiscount(order, currentAmount, steps); //
应用满减规则 BigDecimal finalAmount applyFullReduction(order, discountedAmount, steps); //
计算积分奖励 Integer points calculatePoints(finalAmount, order); return new OrderProcessResult(/* 构建返回结果 */); } private BigDecimal applyVipDiscount(Order order, BigDecimal currentAmount, ListOrderProcessResult.ProcessStep steps) { MapString, Object params new HashMap(); params.put(userLevel, order.getUserLevel()); params.put(price, currentAmount); RuleExecuteResponse response ruleEngine.executeRule(vip_discount, params); if (response.isSuccess()) { BigDecimal result new BigDecimal(response.getResult().toString()); BigDecimal reduction currentAmount.subtract(result); // 记录处理步骤 steps.add(new OrderProcessResult.ProcessStep( VIP折扣, 根据用户等级 order.getUserLevel() 应用折扣, currentAmount, result, reduction, vip_discount )); return result; } return currentAmount; } }REST API接口RestController RequestMapping(/api/rules) RequiredArgsConstructor public class RuleController { private final DynamicRuleEngine dynamicRuleEngine; GetMapping public ResponseEntityListRuleScript getAllRules() { return ResponseEntity.ok(dynamicRuleEngine.getAllRules()); } PostMapping public ResponseEntityString addRule(RequestBody RuleScript ruleScript) { try { dynamicRuleEngine.addRule(ruleScript); return ResponseEntity.ok(规则添加成功); } catch (Exception e) { return ResponseEntity.badRequest().body(添加失败: e.getMessage()); } } PutMapping(/{ruleName}) public ResponseEntityString updateRule(PathVariable String ruleName, RequestBody RuleScript ruleScript) { try { dynamicRuleEngine.updateRule(ruleName, ruleScript); return ResponseEntity.ok(规则更新成功); } catch (Exception e) { return ResponseEntity.badRequest().body(更新失败: e.getMessage()); } } PostMapping(/execute/{ruleName}) public ResponseEntityRuleExecuteResponse executeRule( PathVariable String ruleName, RequestBody MapString, Object params) { RuleExecuteResponse response dynamicRuleEngine.executeRule(ruleName, params); return ResponseEntity.ok(response); } }操作界面为了方便大家快速直观的体验规则引擎DEMO提供了一套简洁的操作界面包含规则配置与业务场景模拟。
规则管理页面主要功能规则列表展示所有规则及状态在线编辑支持规则脚本的在线修改实时测试规则修改后立即测试效果状态控制一键启用/禁用规则业务演示页面订单模拟器输入订单信息查看处理结果详细步骤清晰展示每个规则的执行过程处理历史记录历史处理结果关键前端代码// 动态执行规则 async function executeRule(ruleName, params) { try { const response await fetch(/api/rules/execute/${ruleName}, { method: POST, headers: { Content-Type: application/json }, body: JSON.stringify(params) }); const result await response.json(); if (result.success) { displayResult(执行成功结果: ${result.result}); } else { displayResult(执行失败: ${result.errorMessage}); } } catch (error) { displayResult(请求失败: ${error.message}); } } // 渲染处理步骤 function displayProcessSteps(processSteps) { const stepsHtml processSteps.map((step, index) { const beforeAmount parseFloat(step.beforeAmount); const afterAmount parseFloat(step.afterAmount); const reduction parseFloat(step.reduction); return div classprocess-step div classstep-number${index 1}/div div classstep-content h4${step.stepName}/h4 p${step.description}/p /div div classstep-result div classamount-change¥${beforeAmount} → ¥${afterAmount}/div div classreduction节省 ¥${reduction.toFixed(