完成学习事务

javamemories-gateway/pom.xml

@@ -43,5 +43,16 @@
             <groupId>redis.clients</groupId>
             <artifactId>jedis</artifactId>
         </dependency>
+
+        <dependency>
+            <groupId>com.alibaba.cloud</groupId>
+            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
+        </dependency>
+
+        <!-- Sentinel 网关适配依赖（关键） -->
+        <dependency>
+            <groupId>com.alibaba.cloud</groupId>
+            <artifactId>spring-cloud-alibaba-sentinel-gateway</artifactId>
+        </dependency>
     </dependencies>
 </project>

javamemories-gateway/src/main/java/cn/mayiming/Config/SentinelDegradeConfig.java

@@ -0,0 +1,40 @@
+package cn.mayiming.Config;
+
+import com.alibaba.csp.sentinel.slots.block.RuleConstant;
+import com.alibaba.csp.sentinel.slots.block.degrade.DegradeRule;
+import com.alibaba.csp.sentinel.slots.block.degrade.DegradeRuleManager;
+import com.alibaba.csp.sentinel.slots.block.degrade.circuitbreaker.CircuitBreakerStrategy;
+import jakarta.annotation.PostConstruct;
+import org.springframework.context.annotation.Configuration;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Sentinel 熔断规则配置
+ * 为下游服务配置熔断策略
+ */
+@Configuration
+public class SentinelDegradeConfig {
+
+    /**
+     * 初始化熔断规则
+     * @PostConstruct：Spring 容器启动后执行
+     */
+    @PostConstruct
+    public void initDegradeRules() {
+        List<DegradeRule> rules = new ArrayList<>();
+
+        DegradeRule orderServiceRule = new DegradeRule();
+        orderServiceRule.setResource("order-service"); // 网关路由ID/服务名
+        // 关键：改为慢请求比例触发熔断
+
+        orderServiceRule.setCount(3000); // 慢请求阈值：3000毫秒（3秒），超过3秒即为慢请求
+        orderServiceRule.setSlowRatioThreshold(0.5); // 慢请求比例阈值：50%（超过50%的请求是慢请求则触发熔断）
+        orderServiceRule.setTimeWindow(10); // 熔断后保持打开状态10秒
+        orderServiceRule.setMinRequestAmount(5); // 最小请求数：累计5次请求后才计算慢请求比例
+
+        rules.add(orderServiceRule);
+        DegradeRuleManager.loadRules(rules);
+    }
+}

javamemories-gateway/src/main/resources/application.yml

@@ -1,5 +1,5 @@
 server:
-  port: 8080
+  port: 8081
 
 spring:
   application:
@@ -44,6 +44,21 @@ spring:
                 # 按 IP 限流（默认）
                 key-resolver: "#{@ipKeyResolver}"
 
+    sentinel:
+      # Sentinel 控制台地址（如果启动了控制台，用于可视化配置）
+      transport:
+        dashboard: localhost:8080  # Sentinel 控制台端口，默认8080
+        port: 8719                 # 客户端和控制台通信的端口
+      # 网关熔断配置
+      gateway:
+        enabled: true              # 开启 Sentinel 网关适配
+        # 熔断后默认的降级响应
+        fallback:
+          mode: response           # 降级方式：返回自定义响应
+          response-status: 503     # 降级响应状态码
+          response-body: "{\"code\":503,\"msg\":\"服务暂时不可用，请稍后重试\",\"data\":null}"  # 降级响应体
+          response-content-type: application/json
+
     # Nacos 注册
     nacos:
       discovery: