关于前端:sentinel整合ribbonfallback5

后期筹备：

启动 nacos 和 sentinel

提供者 9003/9004（以 9003 为样本）

新建 cloudalibaba-provider-payment9003/9004

pom 文件

<?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>mscloud03</artifactId>
        <groupId>com.atguigu.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloudalibaba-provider-payment9003</artifactId>

    <dependencies>
        <!--SpringCloud ailibaba nacos -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency><!-- 引入本人定义的 api 通用包，能够应用 Payment 领取 Entity -->
            <groupId>com.atguigu.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <!-- SpringBoot 整合 Web 组件 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!-- 日常通用 jar 包配置 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

yml 文件

server:
  port: 9003

spring:
  application:
    name: nacos-payment-provider
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848 #配置 Nacos 地址

management:
  endpoints:
    web:
      exposure:
        include: '*'

配置 9004 的时候记得批改端口 

主启动类

@SpringBootApplication
@EnableDiscoveryClient
public class PaymentMain9003
{public static void main(String[] args) {SpringApplication.run(PaymentMain9003.class, args);
    }
}

业务类

@RestController
public class PaymentController
{@Value("${server.port}")
    private String serverPort;

    public static HashMap<Long,Payment> hashMap = new HashMap<>();
    static
    {hashMap.put(1L,new Payment(1L,"28a8c1e3bc2742d8848569891fb42181"));
        hashMap.put(2L,new Payment(2L,"bba8c1e3bc2742d8848569891ac32182"));
        hashMap.put(3L,new Payment(3L,"6ua8c1e3bc2742d8848569891xt92183"));
    }

    @GetMapping(value = "/paymentSQL/{id}")
    public CommonResult<Payment> paymentSQL(@PathVariable("id") Long id)
    {Payment payment = hashMap.get(id);
        CommonResult<Payment> result = new CommonResult(200,"from mysql,serverPort:"+serverPort,payment);
        return result;
    }

}

测试 1

启动 9003 拜访

消费者 84

新建 cloudalibaba-consumer-nacos-order84 

pom 文件

<?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>mscloud03</artifactId>
        <groupId>com.atguigu.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloudalibaba-consumer-nacos-order84</artifactId>

    <dependencies>
        <!--SpringCloud ailibaba nacos -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!--SpringCloud ailibaba sentinel -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>
        <!-- 引入本人定义的 api 通用包，能够应用 Payment 领取 Entity -->
        <dependency>
            <groupId>com.atguigu.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <!-- SpringBoot 整合 Web 组件 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!-- 日常通用 jar 包配置 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

yml 文件

server:
  port: 84

spring:
  application:
    name: nacos-order-consumer
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
    sentinel:
      transport:
        #配置 Sentinel dashboard 地址
        dashboard: localhost:8080
        #默认 8719 端口，如果被占用会主动从 8719 开始顺次 + 1 扫描, 直至找到未被占用的端口
        port: 8719

#消费者将要去拜访的微服务名称 (注册胜利进 nacos 的微服务提供者)
service-url:
  nacos-user-service: http://nacos-payment-provider

主启动

@EnableDiscoveryClient
@SpringBootApplication
public class OrderNacosMain84
{public static void main(String[] args) {SpringApplication.run(OrderNacosMain84.class, args);
    }
}

配置类

@Configuration
public class ApplicationContextConfig
{
    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate()
    {return new RestTemplate();
    }
}

业务类 1

@RestController
@Slf4j
public class CircleBreakerController
{
    public static final String SERVICE_URL = "http://nacos-payment-provider";

    @Resource
    private RestTemplate restTemplate;

    @RequestMapping("/consumer/fallback/{id}")
    @SentinelResource(value = "fallback") 
     public CommonResult<Payment> fallback(@PathVariable Long id)
    {CommonResult<Payment> result = restTemplate.getForObject(SERVICE_URL + "/paymentSQL/"+id,CommonResult.class,id);

        if (id == 4) {throw new IllegalArgumentException ("IllegalArgumentException, 非法参数异样....");
        }else if (result.getData() == null) {throw new NullPointerException ("NullPointerException, 该 ID 没有对应记录, 空指针异样");
        }

        return result;
    }
}

测试 2

启动 9003 9004 84

拜访

 再拜访

能够发现第一次是 9004 端口，第二次是 9003 端口，这外面的话，就能够就晓得意见实现了 ribbon 中的轮训

测试 3

给客户 error 页面，不敌对 

批改业务类（只配置 fallback）

@RestController
@Slf4j
public class CircleBreakerController
{
    public static final String SERVICE_URL = "http://nacos-payment-provider";

    @Resource
    private RestTemplate restTemplate;

    @RequestMapping("/consumer/fallback/{id}")
    @SentinelResource(value = "fallback",fallback = "handlerFallback") //fallback 负责业务异样
    public CommonResult<Payment> fallback(@PathVariable Long id)
    {CommonResult<Payment> result = restTemplate.getForObject(SERVICE_URL + "/paymentSQL/"+id,CommonResult.class,id);

        if (id == 4) {throw new IllegalArgumentException ("IllegalArgumentException, 非法参数异样....");
        }else if (result.getData() == null) {throw new NullPointerException ("NullPointerException, 该 ID 没有对应记录, 空指针异样");
        }

        return result;
    }
    public CommonResult handlerFallback(@PathVariable  Long id,Throwable e) {Payment payment = new Payment(id,"null");
        return new CommonResult<>(444,"兜底异样 handlerFallback,exception 内容"+e.getMessage(),payment);
    }
}

本例 sentinel 无配置

测试 4

这里能够发现没有呈现 error 界面，而是咱们本人配置的兜底的解决计划 

批改业务类（只配置 blockHandler）

@RestController
@Slf4j
public class CircleBreakerController
{
    public static final String SERVICE_URL = "http://nacos-payment-provider";

    @Resource
    private RestTemplate restTemplate;

    @RequestMapping("/consumer/fallback/{id}")
     @SentinelResource(value = "fallback",blockHandler = "blockHandler") //blockHandler 负责在 sentinel 外面配置的降级限流
    public CommonResult<Payment> fallback(@PathVariable Long id)
    {CommonResult<Payment> result = restTemplate.getForObject(SERVICE_URL + "/paymentSQL/"+id,CommonResult.class,id);
        if (id == 4) {throw new IllegalArgumentException ("非法参数异样....");
        }else if (result.getData() == null) {throw new NullPointerException ("NullPointerException, 该 ID 没有对应记录");
        }
        return result;
    }
    public CommonResult handlerFallback(@PathVariable  Long id,Throwable e) {Payment payment = new Payment(id,"null");
        return new CommonResult<>(444,"fallback, 无此流水,exception"+e.getMessage(),payment);
    }
    public CommonResult blockHandler(@PathVariable  Long id,BlockException blockException) {Payment payment = new Payment(id,"null");
        return new CommonResult<>(445,"blockHandler-sentinel 限流, 无此流水: blockException"+blockException.getMessage(),payment);
    }

}

配置 sentinel

测试 5

批改业务类（fallback 和 blockHandler 都配置）

@RestController
@Slf4j
public class CircleBreakerController
{
    public static final String SERVICE_URL = "http://nacos-payment-provider";

    @Resource
    private RestTemplate restTemplate;

    @RequestMapping("/consumer/fallback/{id}")
     @SentinelResource(value = "fallback",fallback = "handlerFallback",blockHandler = "blockHandler")
    public CommonResult<Payment> fallback(@PathVariable Long id)
    {CommonResult<Payment> result = restTemplate.getForObject(SERVICE_URL + "/paymentSQL/"+id,CommonResult.class,id);
        if (id == 4) {throw new IllegalArgumentException ("非法参数异样....");
        }else if (result.getData() == null) {throw new NullPointerException ("NullPointerException, 该 ID 没有对应记录");
        }
        return result;
    }
    public CommonResult handlerFallback(@PathVariable  Long id,Throwable e) {Payment payment = new Payment(id,"null");
        return new CommonResult<>(444,"fallback, 无此流水,exception"+e.getMessage(),payment);
    }
    public CommonResult blockHandler(@PathVariable  Long id,BlockException blockException) {Payment payment = new Payment(id,"null");
        return new CommonResult<>(445,"blockHandler-sentinel 限流, 无此流水: blockException"+blockException.getMessage(),payment);
    }

}

测试 6

再拜访的时候，那就意味着这个时候会被限流解决 

若 blockHandler 和 fallback 都进行了配置，则被限流降级而抛出 BlockException 时只会进入 blockHandler 解决逻辑。

批改业务类（疏忽属性 …….）

@RestController
@Slf4j
public class CircleBreakerController
{
    public static final String SERVICE_URL = "http://nacos-payment-provider";

    @Resource
    private RestTemplate restTemplate;

    @RequestMapping("/consumer/fallback/{id}")
    @SentinelResource(value = "fallback", fallback = "handlerFallback", blockHandler = "blockHandler",
            exceptionsToIgnore = {IllegalArgumentException.class})
    public CommonResult<Payment> fallback(@PathVariable Long id)
    {CommonResult<Payment> result = restTemplate.getForObject(SERVICE_URL + "/paymentSQL/"+id,CommonResult.class,id);
        if (id == 4) {throw new IllegalArgumentException ("非法参数异样....");
        }else if (result.getData() == null) {throw new NullPointerException ("NullPointerException, 该 ID 没有对应记录");
        }
        return result;
    }
    public CommonResult handlerFallback(@PathVariable  Long id,Throwable e) {Payment payment = new Payment(id,"null");
        return new CommonResult<>(444,"fallback, 无此流水,exception"+e.getMessage(),payment);
    }
    public CommonResult blockHandler(@PathVariable  Long id,BlockException blockException) {Payment payment = new Payment(id,"null");
        return new CommonResult<>(445,"blockHandler-sentinel 限流, 无此流水: blockException"+blockException.getMessage(),payment);
    }
}

测试 7