增加 spring cloud alibaba sentinel 服务容错

labx-04/labx-04-sca-sentinel-feign-consumer/src/main/java/cn/iocoder/springcloudalibaba/labx04/sentineldemo/provider/fallback/DemoProviderFeignClientFallbackFactory.java

@@ -24,6 +24,7 @@ public class DemoProviderFeignClientFallbackFactory implements FallbackFactory<D
 
 	@Override
 	public DemoProviderFeignClientFallback create(Throwable throwable) {
+	    // 可以给 DemoProviderFeignClientFallback 提供具体的 throwable 异常
 		return new DemoProviderFeignClientFallback(throwable);
 	}
 

labx-04/labx-04-sca-sentinel-resttemplate-consumer/pom.xml

@@ -0,0 +1,66 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>labx-04</artifactId>
+        <groupId>cn.iocoder.springboot.labs</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>labx-04-sca-sentinel-resttemplate-consumer</artifactId>
+
+    <properties>
+        <maven.compiler.target>1.8</maven.compiler.target>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <spring.boot.version>2.2.4.RELEASE</spring.boot.version>
+        <spring.cloud.version>Hoxton.SR1</spring.cloud.version>
+        <spring.cloud.alibaba.version>2.2.0.RELEASE</spring.cloud.alibaba.version>
+    </properties>
+
+    <!--
+        引入 Spring Boot、Spring Cloud、Spring Cloud Alibaba 三者 BOM 文件，进行依赖版本的管理，防止不兼容。
+        在 https://dwz.cn/mcLIfNKt 文章中，Spring Cloud Alibaba 开发团队推荐了三者的依赖关系
+     -->
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-starter-parent</artifactId>
+                <version>${spring.boot.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+            <dependency>
+                <groupId>org.springframework.cloud</groupId>
+                <artifactId>spring-cloud-dependencies</artifactId>
+                <version>${spring.cloud.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+            <dependency>
+                <groupId>com.alibaba.cloud</groupId>
+                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
+                <version>${spring.cloud.alibaba.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <dependencies>
+        <!-- 引入 SpringMVC 相关依赖，并实现对其的自动配置 -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <!-- 引入 Spring Cloud Alibaba Sentinel 相关依赖，使用 Sentinel 提供服务保障，并实现对其的自动配置 -->
+        <dependency>
+            <groupId>com.alibaba.cloud</groupId>
+            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
+        </dependency>
+    </dependencies>
+
+</project>

labx-04/labx-04-sca-sentinel-resttemplate-consumer/src/main/java/cn/iocoder/springcloudalibaba/labx04/sentineldemo/provider/DemoConsumerApplication.java

@@ -0,0 +1,13 @@
+package cn.iocoder.springcloudalibaba.labx04.sentineldemo.provider;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class DemoConsumerApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(DemoConsumerApplication.class, args);
+    }
+
+}

labx-04/labx-04-sca-sentinel-resttemplate-consumer/src/main/java/cn/iocoder/springcloudalibaba/labx04/sentineldemo/provider/config/RestTemplateConfiguration.java

@@ -0,0 +1,17 @@
+package cn.iocoder.springcloudalibaba.labx04.sentineldemo.provider.config;
+
+import com.alibaba.cloud.sentinel.annotation.SentinelRestTemplate;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.client.RestTemplate;
+
+@Configuration
+public class RestTemplateConfiguration {
+
+    @Bean
+    @SentinelRestTemplate
+    public RestTemplate restTemplate() {
+        return new RestTemplate();
+    }
+
+}

labx-04/labx-04-sca-sentinel-resttemplate-consumer/src/main/java/cn/iocoder/springcloudalibaba/labx04/sentineldemo/provider/controller/ConsumerController.java

@@ -0,0 +1,21 @@
+package cn.iocoder.springcloudalibaba.labx04.sentineldemo.provider.controller;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.client.RestTemplate;
+
+@RestController
+@RequestMapping("/consumer")
+public class ConsumerController {
+
+    @Autowired
+    private RestTemplate restTemplate;
+
+    @GetMapping("/echo")
+    public String echo() {
+        return restTemplate.getForObject("http://127.0.0.1:8080/demo/echo", String.class);
+    }
+
+}

labx-04/labx-04-sca-sentinel-resttemplate-consumer/src/main/resources/application.yaml

@@ -0,0 +1,16 @@
+spring:
+  application:
+    name: demo-consumer
+
+  cloud:
+    # Sentinel 配置项，对应 SentinelProperties 配置属性类
+    sentinel:
+      enabled: true # 是否开启。默认为 true 开启
+      eager: true # 是否饥饿加载。默认为 false 关闭
+      transport:
+        dashboard: 127.0.0.1:7070 # Sentinel 控制台地址
+      filter:
+        url-patterns: /** # 拦截请求的地址。默认为 /*
+
+server:
+  port: 8081

labx-04/pom.xml

@@ -19,6 +19,7 @@
         <module>labx-04-sca-sentinel-file-provider</module>
 
         <module>labx-04-sca-sentinel-feign-consumer</module>
+        <module>labx-04-sca-sentinel-resttemplate-consumer</module>
     </modules>