依赖
<parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-build</artifactId>
<version>2.1.6.RELEASE</version>
<relativePath/>
</parent>
<properties>
<!-- Dependency Versions -->
<spring-cloud-commons.version>2.1.2.RELEASE</spring-cloud-commons.version>
<spring-cloud-netflix.version>2.1.2.RELEASE</spring-cloud-netflix.version>
<spring-cloud-openfeign.version>2.1.2.RELEASE</spring-cloud-openfeign.version>
<spring-cloud-bus.version>2.1.2.RELEASE</spring-cloud-bus.version>
<spring-cloud-gateway.version>2.1.2.RELEASE</spring-cloud-gateway.version>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-commons</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-context</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-client</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-server</artifactId>
<optional>true</optional>
</dependency>
在nacos命令行输入：startup.cmd -m standalone
启动nacos
服务提供者
配置：
server.port=18082
spring.application.name=service-provider
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
management.endpoints.web.exposure.include=*
代码：
@EnableDiscoveryClient
@SpringBootApplication
public class ProviderApplication {
public static void main(String[] args) {
SpringApplication.run(ProviderApplication.class, args);
}
@RestController
class EchoController {
@RequestMapping(value = "/", method = RequestMethod.GET)
public ResponseEntity index() {
return new ResponseEntity("index error", HttpStatus.INTERNAL_SERVER_ERROR);
}
@RequestMapping(value = "/test", method = RequestMethod.GET)
public ResponseEntity test() {
return new ResponseEntity("error", HttpStatus.INTERNAL_SERVER_ERROR);
}
@RequestMapping(value = "/sleep", method = RequestMethod.GET)
public String sleep() {
try {
Thread.sleep(1000L);
}
catch (InterruptedException e) {
e.printStackTrace();
}
return "ok";
}
@RequestMapping(value = "/echo/{string}", method = RequestMethod.GET)
public String echo(@PathVariable String string) {
return "hello Nacos Discovery " + string;
}
@RequestMapping(value = "/divide", method = RequestMethod.GET)
public String divide(@RequestParam Integer a, @RequestParam Integer b) {
return String.valueOf(a / b);
}
}
}
服务消费者
spring.application.name=service-consumer
server.port=18083
management.endpoints.web.exposure.include=*
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
feign.sentinel.enabled=true
spring.cloud.sentinel.transport.dashboard=localhost:8080
spring.cloud.sentinel.eager=true
spring.cloud.sentinel.datasource.ds1.file.file=classpath: flowrule.json
spring.cloud.sentinel.datasource.ds1.file.data-type=json
spring.cloud.sentinel.datasource.ds1.file.rule-type=flow
spring.cloud.sentinel.datasource.ds2.file.file=classpath: degraderule.json
spring.cloud.sentinel.datasource.ds2.file.data-type=json
spring.cloud.sentinel.datasource.ds2.file.rule-type=degrade
degraderule.json
[
{
"resource": "GET:http://service-provider/test",
"count": 0.5,
"grade": 1,
"timeWindow": 30
},
{
"resource": "GET:http://service-provider",
"count": 0.5,
"grade": 1,
"timeWindow": 10
},
{
"resource": "GET:http://service-provider/sleep",
"count": 20.0,
"grade": 0,
"timeWindow": 30
},
{
"resource": "GET:http://service-provider/divide",
"count": 0.5,
"grade": 1,
"timeWindow": 30
}
]
flowrule.json:
[
{
"resource": "GET:http://service-provider/echo/{str}",
"controlBehavior": 0,
"count": 1,
"grade": 1,
"limitApp": "default",
"strategy": 0
}
]
启动类：
@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class ConsumerApplication {
@LoadBalanced
@Bean
public RestTemplate restTemplate() {
return new RestTemplate();
}
@LoadBalanced
@Bean
@SentinelRestTemplate
public RestTemplate restTemplate1() {
return new RestTemplate();
}
public static void main(String[] args) {
SpringApplication.run(ConsumerApplication.class, args);
}
@FeignClient(name = "service-provider", fallback = EchoServiceFallback.class, configuration = FeignConfiguration.class)
public interface EchoService {
@RequestMapping(value = "/echo/{str}", method = RequestMethod.GET)
String echo(@PathVariable("str") String str);
@RequestMapping(value = "/divide", method = RequestMethod.GET)
String divide(@RequestParam("a") Integer a, @RequestParam("b") Integer b);
default String divide(Integer a) {
return divide(a, 0);
}
@RequestMapping(value = "/notFound", method = RequestMethod.GET)
String notFound();
}
}
class FeignConfiguration {
@Bean
public EchoServiceFallback echoServiceFallback() {
return new EchoServiceFallback();
}
}
class EchoServiceFallback implements EchoService {
@Override
public String echo(@PathVariable("str") String str) {
return "echo fallback";
}
@Override
public String divide(@RequestParam Integer a, @RequestParam Integer b) {
return "divide fallback";
}
@Override
public String notFound() {
return "notFound fallback";
}
}
controller:
@RestController
public class TestController {
@Autowired
private RestTemplate restTemplate;
@Autowired
private RestTemplate restTemplate1;
@Autowired
private EchoService echoService;
@Autowired
private DiscoveryClient discoveryClient;
// @PostConstruct
// public void init() {
// restTemplate1.setErrorHandler(new ResponseErrorHandler() {
// @Override
// public boolean hasError(ClientHttpResponse response) throws IOException {
// return false;
// }
//
// @Override
// public void handleError(ClientHttpResponse response) throws IOException {
// System.err.println("handle error");
// }
// });
// }
@RequestMapping(value = "/echo-rest/{str}", method = RequestMethod.GET)
public String rest(@PathVariable String str) {
return restTemplate.getForObject("http://service-provider/echo/" + str,
String.class);
}
@RequestMapping(value = "/index", method = RequestMethod.GET)
public String index() {
return restTemplate1.getForObject("http://service-provider", String.class);
}
@RequestMapping(value = "/test", method = RequestMethod.GET)
public String test() {
return restTemplate1.getForObject("http://service-provider/test", String.class);
}
@RequestMapping(value = "/sleep", method = RequestMethod.GET)
public String sleep() {
return restTemplate1.getForObject("http://service-provider/sleep", String.class);
}
@RequestMapping(value = "/notFound-feign", method = RequestMethod.GET)
public String notFound() {
return echoService.notFound();
}
@RequestMapping(value = "/divide-feign", method = RequestMethod.GET)
public String divide(@RequestParam Integer a, @RequestParam Integer b) {
return echoService.divide(a, b);
}
@RequestMapping(value = "/divide-feign2", method = RequestMethod.GET)
public String divide(@RequestParam Integer a) {
return echoService.divide(a);
}
@RequestMapping(value = "/echo-feign/{str}", method = RequestMethod.GET)
public String feign(@PathVariable String str) {
return echoService.echo(str);
}
@RequestMapping(value = "/services/{service}", method = RequestMethod.GET)
public Object client(@PathVariable String service) {
return discoveryClient.getInstances(service);
}
@RequestMapping(value = "/services", method = RequestMethod.GET)
public Object services() {
return discoveryClient.getServices();
}
}
验证
nacos控制台查看:
调用服务消费者接口执行服务提供者中的方法：
