springCloud入門(三)遠端呼叫方法
阿新 • • 發佈:2019-01-26
新建一個客戶端呼叫已經註冊的遠端伺服器方法:
pom.xml
<?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">
<modelVersion >4.0.0</modelVersion>
<groupId>demo</groupId>
<artifactId>cloud-simple-ui</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId >spring-boot-starter-parent</artifactId>
<version>1.3.5.RELEASE</version>
</parent>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId >spring-cloud-dependencies</artifactId>
<version>Brixton.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.7</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!-- 使用eureka -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-feign</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>
<!-- 使用hystrix -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-hystrix</artifactId>
</dependency>
<dependency>
<groupId>org.jolokia</groupId>
<artifactId>jolokia-core</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
<defaultGoal>compile</defaultGoal>
</build>
</project>
user實體類
public class User {
private String username;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
}
userService 服務類
@Service
public class UserService {
@Autowired
RestTemplate restTemplate;
final String SERVICE_NAME="遠端呼叫的服務名稱";
@HystrixCommand(fallbackMethod = "fallbackSearchAll")
//這裡使用了斷路器,就是@HystrixCommand註解。斷路器的基本作用就是@HystrixCommand註解的方法失敗後,系統將自動切換到fallbackMethod方法執行。斷路器Hystrix具備回退機制、請求快取和請求打包以及監控和配置等功能
public List<User> readUserInfo() {
return restTemplate.getForObject("http://"+SERVICE_NAME+"/user", List.class);
}
private List<User> fallbackSearchAll() {
//這裡是被@HystrixCommand方法註解過的方法失敗後執行的方法
}
}
UserController 控制器
@RestController
public class UserController {
@Autowired
UserService userService;
@RequestMapping(value="/users")
public ResponseEntity<List<User>> readUserInfo(){
List<User> users=userService.readUserInfo();
return new ResponseEntity<List<User>>(users,HttpStatus.OK);
}
}
bootstrap.properties 配置檔案
spring.cloud.config.uri=http://127.0.0.1:${config.port:8888}
spring.cloud.config.name=cloud-config
spring.cloud.config.profile=${config.profile:dev}
eureka.client.serviceUrl.defaultZone=http\://localhost\:8761/eureka/
#service name
spring.application.name=當前專案註冊eureka的名字
#ribbon config
cloud-simple-service.ribbon.ConnectTimeout=5000
cloud-simple-service.ribbon.ReadTimeout=10000
server.port=8080
啟動類
public class WebApplication {
public static void main(String[] args) throws Exception {
SpringApplication.run(WebApplication.class, args);
}
}
啟動程式後就可以在eureka中發現服務,訪問URL即可遠端呼叫方法。