SpringCloud学习之旅14--weather项目report-eureka-feign-gateway-hystrix（网关、熔断）

柔情只为你懂 2022-05-22 01:15 154阅读 0赞

## 目录结构： ##

![70][]

## build.gradle文件： ##

// buildscript 代码块中脚本优先执行
    buildscript {
    
    
    // ext 用于定义动态属性
    ext {
    springBootVersion = '2.0.0.M3'
    }
    
    
    // 使用了Maven的中央仓库及Spring自己的仓库（也可以指定其他仓库）
    repositories {
    // mavenCentral()
    maven { url "https://repo.spring.io/snapshot" }
    maven { url "https://repo.spring.io/milestone" }
    maven { url "http://maven.aliyun.com/nexus/content/groups/public/" }
    }
    
    
    // 依赖关系
    dependencies {
    
    
    // classpath 声明了在执行其余的脚本时，ClassLoader 可以使用这些依赖项
    classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
    }
    }
    
    
    // 使用插件
    apply plugin: 'java'
    apply plugin: 'eclipse'
    apply plugin: 'org.springframework.boot'
    apply plugin: 'io.spring.dependency-management'
    
    
    // 指定了生成的编译文件的版本，默认是打成了 jar 包
    group = 'com.waylau.spring.cloud'
    version = '1.0.0'
    
    
    // 指定编译 .java 文件的 JDK 版本
    sourceCompatibility = 1.8
    
    
    // 使用了Maven的中央仓库及Spring自己的仓库（也可以指定其他仓库）
    repositories {
    //mavenCentral()
    maven { url "https://repo.spring.io/snapshot" }
    maven { url "https://repo.spring.io/milestone" }
    maven { url "http://maven.aliyun.com/nexus/content/groups/public/" }
    }
    
    
    ext {
    springCloudVersion = 'Finchley.M2'
    }
    
    
    // 依赖关系
    dependencies {
    
    
    // 该依赖用于编译阶段
    compile('org.springframework.boot:spring-boot-starter-web')
    
    
    // 添加 Spring Boot Thymeleaf Starter 的依赖
    compile('org.springframework.boot:spring-boot-starter-thymeleaf')
    
    
    // Eureka Client
    compile('org.springframework.cloud:spring-cloud-starter-netflix-eureka-client')
    
    
    // Feign
    //compile('org.springframework.cloud:spring-cloud-starter-openfeign')
    
    // https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-openfeign
    compile group: 'org.springframework.cloud', name: 'spring-cloud-starter-openfeign', version: '1.4.4.RELEASE'
    
    
    // https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-feign
    compile group: 'org.springframework.cloud', name: 'spring-cloud-starter-feign', version: '1.0.3.RELEASE'
    
    
    // Hystrix
    compile('org.springframework.cloud:spring-cloud-starter-netflix-hystrix')
    
    
    // 该依赖用于测试阶段
    testCompile('org.springframework.boot:spring-boot-starter-test')
    }
    
    
    dependencyManagement {
    imports {
    mavenBom "org.springframework.cloud:spring-cloud-dependencies:${springCloudVersion}"
    }
    
    }

## application.properties文件： ##

# 热部署静态文件
    spring.thymeleaf.cache=false
    
    
    spring.application.name: msa-weather-report-eureka-feign-gateway-hystrix
    
    
    eureka.client.serviceUrl.defaultZone: http://localhost:8761/eureka/
    
    feign.client.config.feignName.connectTimeout: 5000
    feign.client.config.feignName.readTimeout: 5000
    
    
    feign.hystrix.enabled=true

### js和页面和vo痛前面一样。 ###

package com.waylau.spring.cloud.weather.service;
    
    
    import java.util.List;
    
    
    import org.springframework.cloud.netflix.feign.FeignClient;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.PathVariable;
    
    
    import com.waylau.spring.cloud.weather.vo.City;
    import com.waylau.spring.cloud.weather.vo.WeatherResponse;
    
    
    /**
     * Data Client.
     * 
     * @since 1.0.0 2017年11月28日
     * @author <a href="https://waylau.com">Way Lau</a> 
     */
    @FeignClient(name="msa-weather-eureka-client-zuul", fallback=DataClientFallback.class)
    public interface DataClient {
    /**
    * 获取城市列表
    * @return
    * @throws Exception
    */
    @GetMapping("/city/cities")
    List<City> listCity() throws Exception;
    
    /**
    * 根据城市ID查询天气数据
    */
    @GetMapping("/data/weather/cityId/{cityId}")
    WeatherResponse getDataByCityId(@PathVariable("cityId") String cityId);
    
    }
    
    
    
    
    
    
    
    
    
    /**
     * 
     */
    package com.waylau.spring.cloud.weather.service;
    
    
    import java.util.ArrayList;
    import java.util.List;
    
    
    import org.springframework.stereotype.Component;
    
    
    import com.waylau.spring.cloud.weather.vo.City;
    import com.waylau.spring.cloud.weather.vo.WeatherResponse;
    
    
    /**
     * DataClient Fallback.
     * 
     * @since 1.0.0 2017年12月2日
     * @author <a href="https://waylau.com">Way Lau</a> 
     */
    @Component
    public class DataClientFallback implements DataClient {
    
    
    @Override
    public List<City> listCity() throws Exception {
    List<City> cityList = null;
    cityList = new ArrayList<>();
    
    City city = new City();
    city.setCityId("101280601");
    city.setCityName("深圳");
    cityList.add(city);
    
    city = new City();
    city.setCityId("101280301");
    city.setCityName("惠州");
    cityList.add(city);
    
    return cityList;
    }
    
    
    @Override
    public WeatherResponse getDataByCityId(String cityId) {
    return null;
    }
    
    
    
    }

package com.waylau.spring.cloud.weather.service;
    
    
    import com.waylau.spring.cloud.weather.vo.Weather;
    
    
    /**
     * Weather Report Service.
     * 
     * @since 1.0.0 2017年11月24日
     * @author <a href="https://waylau.com">Way Lau</a> 
     */
    public interface WeatherReportService {
    
    
    /**
    * 根据城市ID查询天气信息
    * @param cityId
    * @return
    */
    Weather getDataByCityId(String cityId);
    
    }
    
    
    
    
    
    
    
    
    
    package com.waylau.spring.cloud.weather.service;
    
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    
    
    import com.waylau.spring.cloud.weather.vo.Weather;
    import com.waylau.spring.cloud.weather.vo.WeatherResponse;
    
    
    /**
     * Weather Report Service.
     * 
     * @since 1.0.0 2017年11月26日
     * @author <a href="https://waylau.com">Way Lau</a> 
     */
    @Service
    public class WeatherReportServiceImpl implements WeatherReportService {
    @Autowired
    private DataClient dataClient;
    @Override
    public Weather getDataByCityId(String cityId) {
    
    // 由天气数据API微服务来提供
    WeatherResponse resp = dataClient.getDataByCityId(cityId);
    Weather data = null;
    if (resp != null ) {
    return resp.getData();
    }
    return data;
    }
    
    
    
    }

package com.waylau.spring.cloud.weather.controller;
    
    
    import java.util.List;
    
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.servlet.ModelAndView;
    
    
    import com.waylau.spring.cloud.weather.service.DataClient;
    import com.waylau.spring.cloud.weather.service.WeatherReportService;
    import com.waylau.spring.cloud.weather.vo.City;
    /**
     * Weather Report Controller.
     * 
     * @since 1.0.0 2017年11月24日
     * @author <a href="https://waylau.com">Way Lau</a> 
     */
    @RestController
    @RequestMapping("/report")
    public class WeatherReportController {
    private final static Logger logger = LoggerFactory.getLogger(WeatherReportController.class);  
    
    
    @Autowired
    private WeatherReportService weatherReportService;
    
    @Autowired
    private DataClient dataClient;
    
    @GetMapping("/cityId/{cityId}")
    public ModelAndView getReportByCityId(@PathVariable("cityId") String cityId, Model model) throws Exception {
    // 获取城市ID列表
    List<City> cityList = null;
    
    try {
    
    // 由城市数据API微服务提供数据
    cityList = dataClient.listCity();
    
    } catch (Exception e) {
    logger.error("Exception!", e);
    }
    
    model.addAttribute("title", "老卫的天气预报");
    model.addAttribute("cityId", cityId);
    model.addAttribute("cityList", cityList);
    model.addAttribute("report", weatherReportService.getDataByCityId(cityId));
    return new ModelAndView("weather/report", "reportModel", model);
    }
    
    
    
    }

启动顺序03、08、09、10、13、14博文。

![70 1][]

### 访问链接：http://localhost:8080/report/cityId/101280301 ###

![70 2][]

## ##

### 熔断就是一个服务出问题了，不会影响后边的服务，不会影响整个系统，会及时给出相应的提示信息。 ###

[70]: /images/20220522/c6edc9e0864545bb88b73d03ede92d1a.png
[70 1]: /images/20220522/20d52d8be9174691a5e545229eaa8b3c.png
[70 2]: /images/20220522/911eb0109abd439091e7db6b9ff60070.png