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>${project.version}</version> </dependency> <!-- SpringBoot整合Web组件 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <!--日常通用jar包配置--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <scope>runtime</scope> <optional>true</optional> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies></project>yml文件
server: port: 9003spring: application: name: nacos-payment-provider cloud: nacos: discovery: server-addr: localhost:8848 #配置Nacos地址management: endpoints: web: exposure: include: '*'配置9004的时候记得批改端口
主启动类
@SpringBootApplication@EnableDiscoveryClientpublic class PaymentMain9003{ public static void main(String[] args) { SpringApplication.run(PaymentMain9003.class, args); }}业务类
@RestControllerpublic class PaymentController{ @Value("${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: 84spring: 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@SpringBootApplicationpublic class OrderNacosMain84{ public static void main(String[] args) { SpringApplication.run(OrderNacosMain84.class, args); }}配置类
@Configurationpublic class ApplicationContextConfig{ @Bean @LoadBalanced public RestTemplate getRestTemplate() { return new RestTemplate(); }}业务类1
@RestController@Slf4jpublic 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@Slf4jpublic 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@Slf4jpublic 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@Slf4jpublic 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@Slf4jpublic 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); }}