10.SpringCloud Alibaba Sentinel

傷城~ 2023-09-27 13:06 115阅读 0赞

## 10.SpringCloud Alibaba Sentinel ##

### Sentinel基础 ###

#### 官网 ####

Github：https://github.com/alibaba/Sentinel

快速开始：https://sentinelguard.io/zh-cn/docs/quick-start.html

中文文档：https://github.com/alibaba/Sentinel/wiki/%E4%BB%8B%E7%BB%8D

#### Sentinel是什么 ####

##### Sentinel概述 #####

![在这里插入图片描述][bdd066ac019449ae8589a7b5262db46d.png]

##### Sentinel的主要特性 #####

![在这里插入图片描述][21d8400b0fb24ae7a4ac97bc245b9064.png]

###### Sentinel可以完成的功能：绿色方框列出的部分 ######

##### 一句话：Sentinel:分布式系统的流量防卫兵，保护你的微服务 #####

#### Sentinel核心功能 ####

##### 流量控制 #####

例子

![在这里插入图片描述][374ecb4f281e4030b7ee5327384cfd97.png]

##### 熔断降级 #####

![在这里插入图片描述][2a25f614ce9044cea5b67636b4ffdae9.png]

![在这里插入图片描述][0866ec1cbce24436857c1c26c794afb2.png]

##### 系统负载保护 #####

![在这里插入图片描述][95a3d6093ae5474da86cd61e12c36da6.png]

##### 消息削峰填谷 #####

![在这里插入图片描述][39223037f4f64f5eb94e18617f3f1c92.png]

#### Sentinel两个组成部分 ####

![在这里插入图片描述][77e755a983d84f71b613e0008d01b415.png]

### Sentinel控制台 ###

#### 需求分析/图解 ####

![在这里插入图片描述][90f2b7da5169483dbac3525d5186b98a.png]

#### 下载 ####

http://github.com/alibaba/Sentinel/releases/tag/v1.8.0

#### 运行 ####

指令：java -jar sentinel-dashboard-1.8.0.jar

![在这里插入图片描述][ba3c5a0d237d42f4b20ee78dee76758c.png]

注意：Sentinel 控制台 默认端口是8080

#### 访问 ####

浏览器：http://localhost:8080/

账号密码都是：sentinel

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登录成功后控制台页面，目前都是空的，因为sentinel还没有进行流量监控

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#### 注意事项和细节 ####

##### 切换端口号启动 #####

java -jar sentinel-dashboard-1.8.0.jar --server.port=9999

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### Sentinel监控微服务 ###

#### 需求分析/图解 ####

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##### 示意图 #####

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#### 代码/配置实现 ####

##### 在member-service-nacos-provider-10004 添加pom.xml 依赖 #####

<dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
            </dependency>

##### 在member-service-nacos-provider-10004 配置application.yml #####

spring:
      application:
        name: member-service-nacos-provider #配置应用的名称
      datasource:
        type: com.alibaba.druid.pool.DruidDataSource
        url: jdbc:mysql://localhost:3306/e_commerce_center_db?useSSL=true&useUnicode=true&characterEncoding=UTF-8
        username: root
        password: 123456
      #配置nacos
      cloud:
        nacos:
          discovery:
            server-addr: localhost:8848 #配置 Nacos Server的地址
        sentinel:
          transport:
            dashboard: localhost:8080 #指定sentinel控制台的地址
            # 解读transport.port
            # 1.transport.port 端口配置会在被监控的微服务对应主机上启动 Http Server
            # 2.该Http Server 会与Sentinel 控制台进行交互
            # 3.比如sentinel 控制台添加了一个限流规则，会把规则数据push 给这个Http Server 接收
            # Http Server 再将中国规则注册到Sentinel 中
            # 4.简单的讲：transport.port 指定被监控的微服务应用于Sentinel 控制台交互的端口
            # 5.默认端口是 8719，假如被占用了,就会自动的从8719开始依次+1扫描，直到找到一个没有被占用的端口
            port: 8719 # 指定端口

#### 测试 ####

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#### 注意事项和细节 ####

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### Sentinel流量控制 ###

#### 规则 ####

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#### 流量控制实例-QPS ####

##### 需求分析/图解 #####

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##### 配置实现步骤 #####

###### 1.为/member/get/1 增加流控规则 ######

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###### 2.在流控规则菜单，可以看到新增的流控规则 ######

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##### 测试 #####

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###### Sentinel 控制台监控页面 ######

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##### 注意事项和细节 #####

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###### 方案2创建 CustomUrlCleaner.java 对请求路径进行清洗 ######

package com.hspedu.springcloud.controller;
    
    import com.alibaba.csp.sentinel.adapter.servlet.callback.UrlCleaner;
    import org.apache.commons.lang.StringUtils;
    import org.springframework.stereotype.Component;
    
    @Component
    public class CustomUrlCleaner implements UrlCleaner {
        
    
        @Override
        public String clean(String originUrl) {
         // 资源清理 /member/get/1
            /**
             * public static boolean isBlank(String str) {
             *         int strLen;
             *         if (str == null || (strLen = str.length()) == 0) {
             *             return true;
             *         }
             *         for (int i = 0; i < strLen; i++) {
             *             if ((Character.isWhitespace(str.charAt(i)) == false)) {
             *                 return false;
             *             }
             *         }
             *         return true;
             *     }
             */
            // isBlank就是判断 originUrl!=null && originUrl 有长度 && originUrl!=""
            if (StringUtils.isBlank(originUrl)){
        
                return originUrl;
            }
            // 如果originUrl是以/member/get开头,进行处理
            if (originUrl.startsWith("/member/get")){
        
                // 解读
                // 1.如果请求的接口是/member/get 开头的，比如 /member/get/1 或/member/get/10
                // 2.给sentinel 返回资源名为/member/get/*
                // 3.在sentinel 对 /member/get/* 添加流控规则即可
                return "/member/get/*";
            }
            return originUrl;
        }
    }

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#### 流量控制实例-线程数 ####

##### 需求分析/图解 #####

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##### 配置实现步骤 #####

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##### 测试 #####

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###### 结果页面 ######

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##### 注意事项和细节 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-fdnEDxhc-1670145631552)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124103750896.png)\]][img-fdnEDxhc-1670145631552_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124103750896.png]

#### 流量控制实例-关联 ####

##### 关联的含义 #####

当关联的资源达到阈值时，就限流自己

##### 需求分析/图解 #####

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##### 配置实现步骤 #####

###### 在MemberController 添加t1 和 t2 接口 ######

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###### 在Sentinel界面配置 ######

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##### 测试 #####

![在这里插入图片描述][7c68ca41e796421ab6354489c127b31c.png]

###### Postman 模拟高并发访问/t2 ######

1.创建新的collection  
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2.创建新的 request 放到到一个刚创建的collection中

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3.设置 run collection 参数，并运行

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##### 注意事项和细节 #####

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#### 流量控制实例-Warm up ####

##### Warm up 介绍 #####

Warm up 称为冷启动/预热

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2.一张图

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##### 需求分析/图解 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-NBSWMHS9-1670145631558)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124115217765.png)\]][img-NBSWMHS9-1670145631558_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124115217765.png]

##### 配置实现步骤 #####

###### 1.为/t2增加流控规则 ######

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##### 测试 #####

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##### 注意事项和细节 #####

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#### 流量控制实例-排队 ####

##### 排队介绍 #####

![在这里插入图片描述][573dcf7fe2984f089153181e4a35213a.png]

##### 需求分析/图解 #####

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##### 修改业务类 #####

修改 MemberController.java 的 t2()方法

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##### 配置实现步骤 #####

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##### 测试 #####

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### Sentinel熔断降级 ###

#### 线程堆积引出熔断降级 ####

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#### 基本介绍 ####

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#### 熔断策略 ####

##### 慢调用比例 #####

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##### 异常比例 #####

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![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-ABAmE1hw-1670145631566)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124144730555.png)\]][img-ABAmE1hw-1670145631566_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124144730555.png]

##### 异常数 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-bECgNjnV-1670145631566)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124144946948.png)\]][img-bECgNjnV-1670145631566_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124144946948.png]

#### 熔断降级实例-慢调用比例 ####

##### 需求分析/图解 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-fZ625PWk-1670145631567)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124145152158.png)\]][img-fZ625PWk-1670145631567_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124145152158.png]

##### 修改业务类 #####

在MemberController.java 类添加 t3()方法

![在这里插入图片描述][04768ffa15ed4d20ab06f0621744c8e6.png]

##### 配置实现步骤 #####

###### 1.为/t3 增加降级规则 ######

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-YWHoEwVI-1670145631567)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124150030222.png)\]][img-YWHoEwVI-1670145631567_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124150030222.png]

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Qv8Q9n5W-1670145631568)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124150918764.png)\]][img-Qv8Q9n5W-1670145631568_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124150918764.png]

##### 测试 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-i6x1Pon6-1670145631568)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124150302816.png)\]][img-i6x1Pon6-1670145631568_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124150302816.png]

使用postman测试

##### 注意事项和细节 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-CRGw64jU-1670145631568)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124150819485.png)\]][img-CRGw64jU-1670145631568_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124150819485.png]

#### 熔断降级实例-异常比例 ####

##### 需求分析/图解 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-hnxqRIx3-1670145631569)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124151042317.png)\]][img-hnxqRIx3-1670145631569_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124151042317.png]

##### 修改业务类 #####

在MemberController.java添加

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-atYswBx9-1670145631569)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124151835040.png)\]][img-atYswBx9-1670145631569_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124151835040.png]

private static int num = 0; // 执行的计数器
    
    @GetMapping("t4")
    public Result t4(){
        
        // 设计异常比例达到50% > 20%
        if (++num %2 ==0){
        
            // 制造一个异常
            System.out.println(3/0);
        }
        log.info("熔断降级测试[异常比例] 执行t4 线程id={}",Thread.currentThread().getId());
        return Result.success("t4()执行...");
    }

##### 配置实现步骤 #####

1、为/t4 增加降级规则

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-6mufaA51-1670145631569)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124152127379.png)\]][img-6mufaA51-1670145631569_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124152127379.png]

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-nlLJ4eav-1670145631570)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124151954283.png)\]][img-nlLJ4eav-1670145631570_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124151954283.png]

##### 测试 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-054I2ukx-1670145631570)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124152057859.png)\]][img-054I2ukx-1670145631570_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124152057859.png]

浏览器：http://localhost:10004/t4

##### 注意事项和细节 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-eCLfJ42w-1670145631570)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124152443003.png)\]][img-eCLfJ42w-1670145631570_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124152443003.png]

#### 熔断降级实例-异常数 ####

##### 需求分析/图解 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-maQRYITY-1670145631573)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124152603687.png)\]][img-maQRYITY-1670145631573_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124152603687.png]

##### 修改业务类 #####

在MemberController.java添加 t5()方法

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-OJ7OTaV7-1670145631573)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124155805825.png)\]][img-OJ7OTaV7-1670145631573_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124155805825.png]

private static int num = 0; // 执行的计数器
    
    // 设计一个测试案例-满足异常数的阈值，触发限流机制
    @GetMapping("t5")
    public Result t5() {
        
        // 出现6次异常，这里需要设置大于6，需要留出几次做测试和加入簇点链路
        if (++num <= 10) {
        
            System.out.println(3 / 0);
        }
        log.info("熔断降级测试[异常数] 执行t5 线程id={}", Thread.currentThread().getId());
        return Result.success("t5()执行...");
    }

##### 配置实现步骤 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-ulo6ADxK-1670145631574)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124155930613.png)\]][img-ulo6ADxK-1670145631574_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124155930613.png]

##### 测试 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Ou41CkcL-1670145631574)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124160006593.png)\]][img-Ou41CkcL-1670145631574_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124160006593.png]

##### 注意事项和细节 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-nhUQYKlR-1670145631575)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124160427249.png)\]][img-nhUQYKlR-1670145631575_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124160427249.png]

### Sentinel热点规则 ###

#### 一个问题引出热点key限流 ####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-bhSxlRe4-1670145631575)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124165920451.png)\]][img-bhSxlRe4-1670145631575_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124165920451.png]

#### 基本介绍 ####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-u1TPdCCx-1670145631576)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124170250081.png)\]][img-u1TPdCCx-1670145631576_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124170250081.png]

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-07Fjd8J0-1670145631576)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124170437518.png)\]][img-07Fjd8J0-1670145631576_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124170437518.png]

#### 热点Key限流-实例 ####

##### 需求分析/图解 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-9JccshVO-1670145631576)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124170912862.png)\]][img-9JccshVO-1670145631576_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124170912862.png]

##### 修改业务类 #####

在MemberController 添加方法

// 完成对 热点key限流的测试
    
    /**
     * 1. @SentinelResource：指定sentinel限流资源
     * 2. value = "news" 表示sentinel限流资源 名称，由程序员指定
     * 3.blockHandler="newBlockHandler" :当出现限流时，由newBlockHandler方法进行处理
     */
    @GetMapping("news")
    @SentinelResource(value = "news",blockHandler = "newBlockHandler")
    public Result queryNews(@RequestParam(value = "id",required = false) String id,
                            @RequestParam(value = "type",required = false) String type){
        
        // 在实际开发汇总，新闻应该到DB或者缓存获取，这里就模拟一下
        log.info("到DB 查询新闻");
        return Result.success("返回新闻 id="+id+" " + "新闻 from DB");
    }
    
    // 热点key限制/限流异常处理方法
    public Result newBlockHandler(String id, String type, BlockException blockException){
        
        return Result.success("查询id="+id+" 新闻 触发热点key限流保护 sorry...");
    }

##### 配置实现步骤 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-wTuHHiq6-1670145631577)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124174719145.png)\]][img-wTuHHiq6-1670145631577_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124174719145.png]

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-R1fFfWaK-1670145631577)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124174807270.png)\]][img-R1fFfWaK-1670145631577_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124174807270.png]

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-GuPRGm3s-1670145631578)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124175419225.png)\]][img-GuPRGm3s-1670145631578_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124175419225.png]

##### 测试 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-dUbTttCF-1670145631578)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124173633559.png)\]][img-dUbTttCF-1670145631578_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124173633559.png]

#### 注意事项和细节 ####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-YtH4fFez-1670145631578)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124180218014.png)\]][img-YtH4fFez-1670145631578_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124180218014.png]

### 系统规则 ###

#### 一个问题引出系统规则 ####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-SjR6mAMP-1670145631579)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124180913680.png)\]][img-SjR6mAMP-1670145631579_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124180913680.png]

##### 一句话：系统规则作用，在系统稳定的前提下，保持系统的吞吐量 #####

#### 基本介绍 ####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-MYN1UZzj-1670145631579)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124181425170.png)\]][img-MYN1UZzj-1670145631579_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124181425170.png]

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-iy2muQzB-1670145631580)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124181606391.png)\]][img-iy2muQzB-1670145631580_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124181606391.png]

#### 实例 ####

##### 需求分析/图解 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-R6fgSxRE-1670145631580)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124182041194.png)\]][img-R6fgSxRE-1670145631580_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124182041194.png]

##### 配置实现步骤 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-CqmYOump-1670145631580)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124182128919.png)\]][img-CqmYOump-1670145631580_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124182128919.png]

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-UByrSdlP-1670145631581)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124182156416.png)\]][img-UByrSdlP-1670145631581_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124182156416.png]

##### 测试 #####

http://localhost:10004/t1

### @SentinelResource ###

#### 自定义全局限流处理类 ####

##### 需求分析/图解 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-rwBLskkx-1670145631581)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124183118733.png)\]][img-rwBLskkx-1670145631581_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124183118733.png]

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-MI2868va-1670145631581)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124183156532.png)\]][img-MI2868va-1670145631581_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124183156532.png]

##### 代码实现 #####

创建全局限流处理类 CustomGlobalBlockHandler.java

package com.hspedu.springcloud.handler;
    
    import com.alibaba.csp.sentinel.slots.block.BlockException;
    import com.hspedu.springcloud.entity.Result;
    
    /**
     * 1.CustomGlobalBlockHandler 全局限流处理类
     * 2.在CustomGlobalBlockHandler类中，可以编写限流处理方法，但是要求方法是static
     */
    public class CustomGlobalBlockHandler {
        
    
        public static Result handlerMethod1(BlockException blockException){
        
            return Result.error("400","客户自定义异常/限流处理方法handlerMethod1");
        }
    
        public static Result handlerMethod2(BlockException blockException){
        
            return Result.error("400","客户自定义异常/限流处理方法handlerMethod2");
        }
    }

在MemberController.java 使用全局限流处理类

/**
     *value = "t6" 表示 sentinel限流资源的名字
     * blockHandlerClass = CustomGlobalBlockHandler.class 全局限流处理类
     * blockHandler = "handlerMethod1" 指定使用全局限流处理类的哪个方法，处理信息
     */
    // 这里我们使用全局限流处理类，显示限流信息
    @GetMapping("t6")
    @SentinelResource(value = "t6",
            blockHandlerClass = CustomGlobalBlockHandler.class,
            blockHandler = "handlerMethod1")
    public Result t6(){
        
        log.info("执行t6() 线程id={}",Thread.currentThread().getId());
        return Result.success("200","t6() 执行OK~~");
    }

##### 配置实现步骤 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-uqcLLf31-1670145631582)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124184021203.png)\]][img-uqcLLf31-1670145631582_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124184021203.png]

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-GMPGyqSR-1670145631582)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124184028413.png)\]][img-GMPGyqSR-1670145631582_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124184028413.png]

##### 测试 #####

http://localhost:10004/t6

#### fallback ####

##### 看一段代码-引出fallback #####

// 这里我们使用全局限流处理类，显示限流信息
    @GetMapping("t6")
    @SentinelResource(value = "t6",
            blockHandlerClass = CustomGlobalBlockHandler.class,
            blockHandler = "handlerMethod1")
    public Result t6(){
        
    
        // 假定：当访问t6资源次数是5的倍数时，就出现java异常
        if (++num%5==0){
        
            throw new RuntimeException("num的值异常 num=" +num);
        }
    
        log.info("执行t6() 线程id={}",Thread.currentThread().getId());
        return Result.success("200","t6() 执行OK~~");
    }

##### 基本介绍 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-FDBEksSW-1670145631582)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124190914414.png)\]][img-FDBEksSW-1670145631582_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124190914414.png]

##### 需求分析/图解 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-TEUuRvRw-1670145631583)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124190953493.png)\]][img-TEUuRvRw-1670145631583_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124190953493.png]

##### 代码实现 #####

创建 GustomGlobalFallbackHandler 全局fallback处理类

package com.hspedu.springcloud.handler;
    
    import com.hspedu.springcloud.entity.Result;
    
    /**
     * GustomGlobalFallbackHandler 全局fallback处理类
     * 在GustomGlobalFallbackHandler 类中，可以编写处理java异常/业务异常方法 static
     */
    public class GustomGlobalFallbackHandler {
        
    
        public static Result fallbackHandlerMethod1(Throwable throwable){
        
            return Result.error("402","java异常 信息="+throwable.getMessage());
        }
    
        public static Result fallbackHandlerMethod2(Throwable throwable){
        
            return Result.error("403","java异常 信息="+throwable.getMessage());
        }
    }

在MemberController 类修改

/**
     *value = "t6" 表示 sentinel限流资源的名字
     * blockHandlerClass = CustomGlobalBlockHandler.class 全局限流处理类
     * blockHandler = "handlerMethod1" 指定使用全局限流处理类的哪个方法，处理信息
     * allbackClass = GustomGlobalFallbackHandler.class 全局fallback处理
     * fallback = "fallbackHandlerMethod1" 指定使用全局fallback处理类的哪个方法来处理
     */
    // 这里我们使用全局限流处理类，显示限流信息
    @GetMapping("t6")
    @SentinelResource(value = "t6",
            fallbackClass = GustomGlobalFallbackHandler.class,
            fallback = "fallbackHandlerMethod1",
            blockHandlerClass = CustomGlobalBlockHandler.class,
            blockHandler = "handlerMethod1")
    public Result t6(){
        
    
        // 假定：当访问t6资源次数是5的倍数时，就出现java异常
        if (++num%5==0){
        
            throw new RuntimeException("num的值异常 num=" +num);
        }
    
        log.info("执行t6() 线程id={}",Thread.currentThread().getId());
        return Result.success("200","t6() 执行OK~~");
    }

##### 测试 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-xtY0pw3u-1670145631583)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124200753804.png)\]][img-xtY0pw3u-1670145631583_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124200753804.png]

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-iu7NL4R9-1670145631584)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124200806731.png)\]][img-iu7NL4R9-1670145631584_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124200806731.png]

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-C0Hs3Miv-1670145631584)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124200847237.png)\]][img-C0Hs3Miv-1670145631584_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124200847237.png]

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-6ZVE7FHZ-1670145631584)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124200906729.png)\]][img-6ZVE7FHZ-1670145631584_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124200906729.png]

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Ypu3dSDF-1670145631585)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124200916103.png)\]][img-Ypu3dSDF-1670145631585_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124200916103.png]

#### exceptionsTolgnore ####

##### 基本介绍 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-e9h2YvSD-1670145631585)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124201139153.png)\]][img-e9h2YvSD-1670145631585_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124201139153.png]

##### 应用实例 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Nz2sHoaW-1670145631586)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221124201240794.png)\]][img-Nz2sHoaW-1670145631586_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221124201240794.png]

exceptionsToIgnore = \{RuntimeException.class\} :如果t6抛出RuntimeException，就使用系统默认方式处理

/**
     *value = "t6" 表示 sentinel限流资源的名字
     * blockHandlerClass = CustomGlobalBlockHandler.class 全局限流处理类
     * blockHandler = "handlerMethod1" 指定使用全局限流处理类的哪个方法，处理信息
     * allbackClass = GustomGlobalFallbackHandler.class 全局fallback处理
     * fallback = "fallbackHandlerMethod1" 指定使用全局fallback处理类的哪个方法来处理
     * exceptionsToIgnore = {RuntimeException.class} :如果t6抛出RuntimeException，就使用系统默认方式处理
     */
    // 这里我们使用全局限流处理类，显示限流信息
    @GetMapping("t6")
    @SentinelResource(value = "t6",
            fallbackClass = GustomGlobalFallbackHandler.class,
            fallback = "fallbackHandlerMethod1",
            blockHandlerClass = CustomGlobalBlockHandler.class,
            blockHandler = "handlerMethod1",
            exceptionsToIgnore = {
        RuntimeException.class})
    public Result t6(){
        
    
        // 假定：当访问t6资源次数是5的倍数时，就出现java异常
        if (++num%5==0){
        
            throw new RuntimeException("num的值异常 num=" +num);
        }
    
        log.info("执行t6() 线程id={}",Thread.currentThread().getId());
        return Result.success("200","t6() 执行OK~~");
    }

#### 接入 Sentinel的方式 ####

##### 代码方式(硬编码，侵入性强，不推荐) #####

##### 注解方式(低侵入性，前面用过，推荐) #####

###### @SentinelResource注解 ######

> 注意：注解方式埋点不支持 private 方法，处理指定异常的方法也不支持 private

### OpenFeign+sentinel对远程调用熔断降级 ###

#### 当前微服务基础环境 ####

##### 当前微服务环境架构图 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-phLyDjs9-1670145631586)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125091039650.png)\]][img-phLyDjs9-1670145631586_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125091039650.png]

##### 测试 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-QZOsxGYd-1670145631586)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125091519512.png)\]][img-QZOsxGYd-1670145631586_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125091519512.png]

浏览器：http://localhost:81/member/nacos/consumer/get/2 目前是Ribbon+RestTemplate

#### 服务消费者整合Openfeign ####

##### 需求分析/图解 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-kU43uiNU-1670145631587)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125092242185.png)\]][img-kU43uiNU-1670145631587_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125092242185.png]

##### 代码+配置实现步骤 #####

在 member-service-nacos-consumer-80 引入依赖

<dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</artifactId>
            </dependency>

添加OpenFeign调用接口 MemberOpenFeignService

@FeignClient(value = "member-service-nacos-provider")
    public interface MemberOpenFeignService {
        
    
        @GetMapping("member/get/{id}")
        public Result getMemberById(@PathVariable("id") Long id);
    
    }

在 MemberNacosConsumerController 添加OpenFeign 远程调用接口

// 装配 MemberOpenFeignService
    @Resource
    private MemberOpenFeignService memberOpenFeignService;
    
    // 编写方法通过OpenFeign实现远程调用
    @GetMapping("member/openfeign/consumer/get/{id}")
    public Result getMemberOpenFeignById(@PathVariable("id") Long id){
        
        // 这里使用OpenFeign接口方式调用
        return memberOpenFeignService.getMemberById(id);
    }

在 MemberNacosConsumerApplication80 启用openfeign

@SpringBootApplication
    @EnableDiscoveryClient // 引入的是启动nacos发现注解
    @EnableFeignClients // 启用openFeign
    public class MemberNacosConsumerApplication80 {
        
        public static void main(String[] args) {
        
            SpringApplication.run(MemberNacosConsumerApplication80.class,args);
        }
    }

##### 测试 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-pHweJMjq-1670145631587)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125093617552.png)\]][img-pHweJMjq-1670145631587_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125093617552.png]

浏览器：http://localhost:81/member/openfeign/consumer/get/2

#### 服务消费者整合Sentinel ####

##### 需求分析/图解 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-En4KyzQC-1670145631587)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125094226810.png)\]][img-En4KyzQC-1670145631587_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125094226810.png]

##### 代码+配置实现步骤 #####

在 member-service-nacos-consumer-80 引入依赖

<dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
    </dependency>

添加 member-service-nacos-consumer-80 的application.yml 依赖

server:
      port: 81
    
    spring:
      application:
        name: member-service-nacos-consumer-80
      #配置nacos
      cloud:
        nacos:
          discovery:
            server-addr: localhost:8848 #nacos server的地址
        sentinel:
          transport:
            dashboard: localhost:8080 # 指定sentinel控制台地址
            port: 8719
    
    #配置暴露所有的监控点
    management:
      endpoints:
        web:
          exposure:
            include: '*'

##### 测试 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-QIIu1JJh-1670145631588)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125095230681.png)\]][img-QIIu1JJh-1670145631588_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125095230681.png]

浏览器：http://localhost:81/member/openfeign/consumer/get/2

#### OpenFeign+sentinel对对远程调用熔断降级 ####

##### 需求分析/图解 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-XQKYZVpu-1670145631588)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125100600843.png)\]][img-XQKYZVpu-1670145631588_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125100600843.png]

##### 代码+配置实现步骤 #####

在 member-service-nacos-consumer-80 添加实现openfeign接口类，进行熔断降级

package com.hspedu.springcloud.service;
    
    import com.hspedu.springcloud.entity.Result;
    import org.springframework.stereotype.Component;
    
    @Component
    public class MembarFeignFallbackService implements MemberOpenFeignService{
        
    
        @Override
        public Result getMemberById(Long id) {
        
            return Result.error("500","被调用服务异常，熔断降级，快速返回结果，防止请求线程堆积");
        }
    }

在 MemberOpenFeignService 接口注解加上属性

// fallback 加上熔断降级返回的类
    @FeignClient(value = "member-service-nacos-provider",fallback = MembarFeignFallbackService.class)
    public interface MemberOpenFeignService {

添加application.yml 依赖

# openfeign和sentinel整合，必须配置
    feign:
      sentinel:
        enabled: true

##### 测试 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-ZDnVtUrZ-1670145631589)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125101813832.png)\]][img-ZDnVtUrZ-1670145631589_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125101813832.png]

浏览器 http://localhost:81/member/openfeign/consumer/get/2

##### 注意事项和细节 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-oP3Su199-1670145631589)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125105859857.png)\]][img-oP3Su199-1670145631589_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125105859857.png]

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-nNOq4wEN-1670145631590)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125110104084.png)\]][img-nNOq4wEN-1670145631590_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125110104084.png]

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-KiO2UrXl-1670145631590)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125110229626.png)\]][img-KiO2UrXl-1670145631590_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125110229626.png]

### 规则持久化 ###

#### 规则没有持久化的问题 ####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Zfr0HuPo-1670145631590)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125110559287.png)\]][img-Zfr0HuPo-1670145631590_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125110559287.png]

#### 规则持久化方案 ####

阿里云Ahas\[最方便/付费\]

在Nacos Server 配置规则，完成持久化-官方推荐

datasource 支持 nacos,redis,apollo,zk,file

#### Nacos Server 配置中心-规则持久化实例 ####

##### 工作原理示意图 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-CaWt2n5y-1670145631590)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125111714436.png)\]][img-CaWt2n5y-1670145631590_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125111714436.png]

##### 需求分析/图解 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-0F2Syvfb-1670145631591)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125111822186.png)\]][img-0F2Syvfb-1670145631591_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125111822186.png]

##### 代码+配置实现步骤 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-iDMwNe9m-1670145631591)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125112414988.png)\]][img-iDMwNe9m-1670145631591_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125112414988.png]

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-ne9UA7KY-1670145631592)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125113758229.png)\]][img-ne9UA7KY-1670145631592_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125113758229.png]

[
        {
        
            "resource": "/member/openfeign/consumer/get/1",
            "limitApp": "default",
            "grade": 1,
            "count": 1,
            "strategy": 0,
            "controlBehavior": 0,
            "clusterMode": false
        }
    ]

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-e1eOcexb-1670145631592)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125112615954.png)\]][img-e1eOcexb-1670145631592_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125112615954.png]

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-8xYmNwNQ-1670145631593)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125112636088.png)\]][img-8xYmNwNQ-1670145631593_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125112636088.png]

###### 修改 member-service-nacos-consumer-80 ######

<dependency>
                <groupId>com.alibaba.csp</groupId>
                <artifactId>sentinel-datasource-nacos</artifactId>
            </dependency>

###### 修改 member-service-nacos-consumer-80 的yam文件 ######

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-hXh9FUIb-1670145631593)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125113026933.png)\]][img-hXh9FUIb-1670145631593_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125113026933.png]

spring:
      application:
        name: member-service-nacos-consumer-80
      #配置nacos
      cloud:
        nacos:
          discovery:
            server-addr: localhost:8848 #nacos server的地址
        sentinel:
          transport:
            dashboard: localhost:8080 # 指定sentinel控制台地址
            port: 8719
          datasource:
            ds1:
              # 流控规则配置是从nacos server配置中心获取
              nacos:
                server-addr: localhost:8848 # 指定nacos server配置中心地址
                dataId: member-service-nacos-consumer-80 # 指定nacos server配置中心dataId
                groupId: DEFAULT_GROUP # 指定nacos server配置中心 哪个Group
                data-type: json # 指定nacos server配置中心 流控规则的数据类型
                rule-type: flow # 规则类型：流控规则 可以是【flow -流控规则】【degrade -降级规则】【param-flow -热点规则】【system -系统规则】

##### 测试 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-sxduiVeZ-1670145631593)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125115219711.png)\]][img-sxduiVeZ-1670145631593_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125115219711.png]

浏览器：http://localhost:81/member/openfeign/consumer/get/1

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-gUMkJDuf-1670145631594)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125115236065.png)\]][img-gUMkJDuf-1670145631594_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125115236065.png]

##### 注意事项和细节 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-DSlxMRgd-1670145631594)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125115343753-16693484694561.png)\]][img-DSlxMRgd-1670145631594_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125115343753-16693484694561.png]

##### 其他类型规则 #####

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-psyX5akr-1670145631595)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125115506122.png)\]][img-psyX5akr-1670145631595_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125115506122.png]

![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-JWhzcr0O-1670145631595)(E:\\Java资料\\韩顺平Java\\资料\\SpringCloud\\笔记\\10.SpringCloud Alibaba Sentinel.assets\\image-20221125115535723.png)\]][img-JWhzcr0O-1670145631595_E_Java_Java_SpringCloud_10.SpringCloud Alibaba Sentinel.assets_image-20221125115535723.png]

##### rult-type 配置 #####

可以是【flow -流控规则】【degrade -降级规则】【param-flow -热点规则】【system -系统规则】

##### 3.其他规则-配置文档 #####

https://sentinelguard.io/zh-cn/docs/basic-api-resource-rule.html

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