SpringCloud Hoxton版 + SpringCloud alibaba学习笔记（12）-- SpringCloud Alibaba Sentinel @SentinelResource

本是古典何须时尚 2023-01-03 15:29 144阅读 0赞

### 一、按资源名称限流+后续处理 ###

#### 1、启动Nacos成功 ####

#### 2、启动Sentinel成功 ####

#### 3、Module ####

##### ①、cloudalibaba-sentinel-service8401 #####

##### ②、POM #####

<dependency>
        <groupId>com.atguigu.springcloud</groupId>
        <artifactId>cloud-api-commons</artifactId>
        <version>${project.version}</version>
    </dependency>

##### ③、YML #####

server:
      port: 8401
    
    spring:
      application:
        name: cloudalibaba-sentinel-service
      cloud:
        nacos:
          discovery:
            server-addr: localhost:8848
        sentinel:
          transport:
            dashboard: localhost:8080
            port: 8719 #默认8719，假如被占用了会自动从8719开始依次+1扫描。直至找到未被占用的端口
    
    management:
      endpoints:
        web:
          exposure:
            include: '*'

##### ④、业务类RateLimitController #####

package com.atguigu.springcloud.alibaba.controller;
    
    import com.alibaba.csp.sentinel.annotation.SentinelResource;
    import com.alibaba.csp.sentinel.slots.block.BlockException;
    
    import com.atguigu.springcloud.entities.*;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    
    @RestController
    public class RateLimitController
    { 
        @GetMapping("/byResource")
        @SentinelResource(value = "byResource",blockHandler = "handleException")
        public CommonResult byResource()
        { 
            return new CommonResult(200,"按资源名称限流测试OK",new Payment(2020L,"serial001"));
        }
        public CommonResult handleException(BlockException exception)
        { 
            return new CommonResult(444,exception.getClass().getCanonicalName()+"\t 服务不可用");
        }

##### ⑤、主启动 #####

package com.atguigu.springcloud.alibaba;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    
    
    @EnableDiscoveryClient
    @SpringBootApplication
    public class MainApp8401
    { 
        public static void main(String[] args) { 
            SpringApplication.run(MainApp8401.class, args);
        }
    
    }

#### 4、配置流控规则 ####

##### ①、配置步骤 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70]

##### ②、图形配置和代码关系 #####

##### ③、表示1秒钟内查询次数大于1，就跑到我们自定义的处流，限流 #####

#### 5、测试 ####

1秒钟点击1下，OK  
超过上述问题，疯狂点击，返回了自己定义的限流处理信息，限流发送  
![在这里插入图片描述][20210109114521157.png]

#### 6、额外问题 ####

此时关闭微服务8401看看  
Sentinel控制台，流控规则消失了？？？？？  
临时/持久？

### 二、按照Url地址限流+后续处理 ###

#### 1、通过访问的URL来限流，会返回Sentinel自带默认的限流处理信息 ####

#### 2、业务类RateLimitController ####

@GetMapping("/rateLimit/byUrl")
    @SentinelResource(value = "byUrl")
    public CommonResult byUrl()
    { 
        return new CommonResult(200,"按url限流测试OK",new Payment(2020L,"serial002"));
    }

#### 3、访问一次 ####

#### 4、Sentinel控制台配置 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 1]

#### 5、测试 ####

疯狂点击http://localhost:8401/rateLimit/byUrl  
结果  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 2]

### 三、上面兜底方法面临的问题 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 3]

### 四、客户自定义限流处理逻辑 ###

#### 1、创建customerBlockHandler类用于自定义限流处理逻辑 ####

#### 2、自定义限流处理类 ####

CustomerBlockHandler  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 4]

package com.atguigu.springcloud.alibaba.myhandler;
    
    import com.alibaba.csp.sentinel.slots.block.BlockException;
    import com.atguigu.springcloud.entities.*;
    
    public class CustomerBlockHandler { 
    
        public static CommonResult handleException(BlockException exception) { 
            return new CommonResult(2020, "自定义限流处理信息....CustomerBlockHandler");
    
        }
    }

#### 3、RateLimitController ####

@GetMapping("/rateLimit/customerBlockHandler")
    @SentinelResource(value = "customerBlockHandler",
            blockHandlerClass = CustomerBlockHandler.class,
            blockHandler = "handlerException2")
    public CommonResult customerBlockHandler()
    { 
        return new CommonResult(200,"按客戶自定义",new Payment(2020L,"serial003"));
    }

#### 4、启动微服务后先调用一次 ####

http://localhost:8401/rateLimit/customerBlockHandler

#### 5、Sentinel控制台配置 ####

#### 6、测试后我们自定义的出来了 ####

#### 7、进一步说明 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 5]

### 五、更多注解属性说明 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 6]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 7]

#### 1、多说一句 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 8]

#### 2、Sentinel主要有三个核心API（了解一下） ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2V4b2R1czM_size_16_color_FFFFFF_t_70 9]

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[20210109114521157.png]: /images/20221119/550d8cf3c7bb46228758cdc35cb0a3d7.png
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