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项目的配置:

pom.xml

               
    
     org.springframework.cloud
                
    
     spring-cloud-starter-alibaba-sentinel
                
    
     0.2.2.RELEASE
            
           
               
    
     com.alibaba.csp
                
    
     sentinel-core
                
    
     1.7.0
            
           
               
    
     com.alibaba.csp
                
    
     sentinel-transport-simple-http
                
    
     1.7.0
            
           
               
    
     com.alibaba.csp
                
    
     sentinel-datasource-nacos
                
    
     1.7.0
            
           
               
    
     com.alibaba.csp
                
    
     sentinel-annotation-aspectj
                
    
     1.7.0
            
           
               
    
     com.alibaba.csp
                
    
     sentinel-web-servlet
                
    
     1.7.0
            
   

application.yml

application:    name: xxxProjectName  cloud:    sentinel:      transport:        dashboard: localhost:8080  #sentinel DashBoard 的端口号和地址      eager: true

配置sentinel需要的bean 设置降级规则为快速失败等等

package com.lty.fsb.cabintech.config;import com.alibaba.csp.sentinel.annotation.aspectj.SentinelResourceAspect;import com.alibaba.csp.sentinel.slots.block.RuleConstant;import com.alibaba.csp.sentinel.slots.block.flow.FlowRule;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import javax.annotation.PostConstruct;import java.util.ArrayList;import java.util.List;@Configurationpublic class SentinelAspectConfiguration {
       @Bean    public SentinelResourceAspect sentinelResourceAspect() {
           return new SentinelResourceAspect();    }    @PostConstruct    private void initRules() throws Exception {
           FlowRule rule1 = new FlowRule();        rule1.setResource("getAllParkList");//@sentinelResource的value的名字        rule1.setGrade(RuleConstant.FLOW_GRADE_QPS);  // 规则类型        rule1.setCount(1);   // 每秒调用最大次数为 1 次        FlowRule rule2 = new FlowRule();        rule2.setResource("checkHealthInfo");        rule2.setGrade(RuleConstant.FLOW_GRADE_QPS);        rule2.setCount(1);   // 每秒调用最大次数为 1 次        List
   
     rules = new ArrayList<>();        rules.add(rule1);        rules.add(rule2);        // 将控制规则载入到 Sentinel        com.alibaba.csp.sentinel.slots.block.flow.FlowRuleManager.loadRules(rules);    }}
   

public class AmountOptionalController {
   @AutowiredAmountOptionalService amountOptionalService;      @RequestMapping("healthInfo")    public Result health() {
           return  amountOptionalService.checkHealthInfo();    }}

@Override    @SentinelResource(value = "checkHealthInfo" ,fallback = "healthFallback")    public Result checkHealthInfo() {
           return ResultUtil.requestSuccess("service health");    }    public Result healthFallback(){
           return ResultUtil.requestFaild("进入限流");    }

@GetMapping("getAllParkList")@SentinelResource(value = "getAllParkList",fallback = "getFailedParkList")public Result getAllParkList() throws Exception {
      return ResultUtil.requestSuccess("");}

public Result getFailedParkList(){
           return ResultUtil.requestFaild("请求太快,请求已拦截");    }

启动后请求接口 ,连续请求两次 结果:

配置dashboard:

文档   https://github.com/alibaba/Sentinel/wikidashboard release 下载地址:https://github.com/alibaba/Sentinel/releases

启动Sentinel服务端后台管理

执行命令：java -Dserver.port=8080 -jar sentinel-dashboard-1.6.0.jar   默认8080端口

可用参数:

访问 localhost:8080

默认登录用户:sentinel       pwd:sentinel

在编辑规则处可以修改配置的参数

目前本人就学习到这里 还有个问题:

2020-04-02 15:04:53.985 ERROR 80796 --- [pool-2-thread-1] c.a.c.s.dashboard.metric.MetricFetcher   : Failed to fetch metric from 
   
     (ConnectionException: Connection refused)
   

不知道如何处理 有大神的话 请私信 !!!

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