搭建SpringCloud微服務


建立spring父模塊

  • 刪除不必要的src目錄
  • 父模塊中的pom.xml中添加相應的依賴以及插件、遠程倉庫地址
 1     <!-- 項目的打包類型, 即項目的發布形式, 默認為 jar. 對於聚合項目的父模塊來說, 必須指定為 pom -->
 2     <packaging>pom</packaging>
 3 
 4     <name>spring-cloud-home-page</name>
 5     <description>Project For VastHomepage SpringCloud</description>
 6 
 7     <parent>
 8         <groupId>org.springframework.boot</groupId>
 9         <artifactId>spring-boot-starter-parent</artifactId>
10         <version>2.1.4.RELEASE</version>
11     </parent>
12 
13     <properties>
14         <spring-cloud.version>Greenwich.RELEASE</spring-cloud.version>
15     </properties>
16 
17     <dependencies>
18         <!-- lombok 工具通過在代碼編譯時期動態的將注解替換為具體的代碼,
19         IDEA 需要添加 lombok 插件 -->
20         <dependency>
21             <groupId>org.projectlombok</groupId>
22             <artifactId>lombok</artifactId>
23             <version>1.16.18</version>
24         </dependency>
25         <dependency>
26             <groupId>org.springframework.boot</groupId>
27             <artifactId>spring-boot-starter-test</artifactId>
28             <scope>test</scope>
29         </dependency>
30     </dependencies>
31 
32     <!-- 標識 SpringCloud 的版本 -->
33     <dependencyManagement>
34         <dependencies>
35             <dependency>
36                 <groupId>org.springframework.cloud</groupId>
37                 <artifactId>spring-cloud-dependencies</artifactId>
38                 <version>${spring-cloud.version}</version>
39                 <type>pom</type>
40                 <scope>import</scope>
41             </dependency>
42         </dependencies>
43     </dependencyManagement>
44 
45     <!-- 配置遠程倉庫 -->
46     <repositories>
47         <repository>
48             <id>spring-milestones</id>
49             <name>Spring Milestones</name>
50             <url>https://repo.spring.io/milestone</url>
51             <snapshots>
52                 <enabled>false</enabled>
53             </snapshots>
54         </repository>
55     </repositories>

 

創建 Eureka注冊服務子模塊

  • pom.xml中引入必要的依賴以及插件
   <!-- 模塊名及描述信息 -->
    <name>spring-cloud-eureka</name>
    <description>Spring Cloud Eureka</description>

    <!-- eureka server: 提供服務發現與服務注冊 -->
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
    </dependencies>

    <!--
        SpringBoot的Maven插件, 能夠以Maven的方式為應用提供SpringBoot的支持,可以將
        SpringBoot應用打包為可執行的jar或war文件, 然后以通常的方式運行SpringBoot應用
     -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

 

  • 資源文件夾(resources)中創建application.yml
spring:
  application:
    name: spring-cloud-eureka

server:
  port: 8000

eureka:
  instance:
    hostname: localhost
  client:
    fetch-registry: false
    register-with-eureka: false
    service-url:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

 

  • 啟動類上,加上兩個注解@EnableEurekaServer@SpringBootApplication

 

啟動

方式一:Teriminal窗口

/** 進入項目目錄 */

cd 項目名

/** 將項目打包成jar */

mvn clean package -Dmaven.test.skip=true -U

/** 進入target目錄 */

cd target

/** 用jar命令啟動項目 */

java -jar 項目名.jar

方式二

直接運行application,啟動即可

 

上面是Eureka的單節點啟動方式,公司中一般為了防止Eureka單節點故障,下面介紹Eureka的多節點偽集群配置方式

  • 在原項目資源文件夾下創建bootstrap.yml,注釋掉application.yml中的配置,因為在springBoot項目中會先加載bootstrap.yml
  • 修改Windows中C:\Windows\System32\drivers\etc路徑下的hosts文件
127.0.0.1 server1
127.0.0.1 server2
127.0.0.1 server3

bootstrap.yml:

spring:
  application:
    name: spring-cloud-eureka
  profiles: server1
server:
  port: 8000
eureka:
  instance:
    hostname: server1
    prefer-ip-address: false
  client:
    service-url:
      defaultZone: http://server2:8001/eureka/,http://server3:8002/eureka/

---
spring:
  application:
    name: spring-cloud-eureka
  profiles: server2
server:
  port: 8001
eureka:
  instance:
    hostname: server2
    prefer-ip-address: false
  client:
    service-url:
      defaultZone: http://server1:8000/eureka/,http://server3:8002/eureka/

---
spring:
  application:
    name: spring-cloud-eureka
  profiles: server3
server:
  port: 8002
eureka:
  instance:
    hostname: server3
    prefer-ip-address: false
  client:
    service-url:
      defaultZone: http://server1:8000/eureka/,http://server2:8001/eureka/

 

以上配置完成后,在以上啟動方式一的基礎上,在啟動時需加上一個命令,以表示啟動哪個Eureka節點

 

java -jar 項目名.jar --spring.profiles.active=server1 #標識啟動Eureka的server1的服務,以此類推

 

 

啟動完成后可在瀏覽器中訪問

http://127.0.0.1:8000/

 

父模塊中創建zuul網關服務

pom.xml中引入相關依賴、插件

    <!-- 模塊名及描述信息 -->
    <name>spring-cloud-zuul</name>
    <description>Spring Cloud Gateway</description>

    <dependencies>
        <!--
            Eureka 客戶端, 客戶端向 Eureka Server 注冊的時候會提供一系列的元數據信息, 例如: 主機, 端口, 健康檢查url等
            Eureka Server 接受每個客戶端發送的心跳信息, 如果在某個配置的超時時間內未接收到心跳信息, 實例會被從注冊列表中移除
        -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <!-- 服務網關 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
        </dependency>
        <!-- apache 工具類 -->
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>1.3.2</version>
        </dependency>
    </dependencies>

    <!--
        SpringBoot的Maven插件, 能夠以Maven的方式為應用提供SpringBoot的支持,可以將
        SpringBoot應用打包為可執行的jar或war文件, 然后以通常的方式運行SpringBoot應用
     -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

 

資源文件夾中創建application.yml

spring:
  application:
    name: spring-cloud-zuul

server:
  port: 9000

eureka:
  client:
    service-url:
      defaultZone: http://server1:8000/eureka

zuul:
  prefix: /vast
  routes:
    course:
      path: /course/**
      serviceId: spring-cloud-course-service
      strip-prefix: false
    user:
      path: /user/**
      serviceId: spring-cloud-user-service
      strip-prefix: false

 

啟動類添加兩個注解

@SpringCloudApplication
@EnableZuulProxy

注意:這兩個注解和Eureka中啟動類中聲明的注解是不一樣的

 

創建兩個過濾類,來計算不同URL請求到響應時所需要的時間

PreFilter.class
package com.vast.zuul.filters;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
import org.springframework.stereotype.Component;

@Component
public class PreFilter extends ZuulFilter {
    @Override
    public String filterType() {
        return FilterConstants.PRE_TYPE;
    }

    @Override
    public int filterOrder() {
        return 0;
    }

    @Override
    public boolean shouldFilter() {
        return true;
    }

    @Override
    public Object run() throws ZuulException {
        RequestContext currentContext = RequestContext.getCurrentContext();
        currentContext.set("startTime", System.currentTimeMillis());
        return null;
    }
}

 

 AccessLogFilter.class

package com.vast.zuul.filters;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

@Slf4j
@Component
public class AccessLogFilter extends ZuulFilter {
    @Override
    public String filterType() {
        return FilterConstants.POST_TYPE;
    }

    @Override
    public int filterOrder() {
        return FilterConstants.SEND_RESPONSE_FILTER_ORDER - 1;
    }

    @Override
    public boolean shouldFilter() {
        return true;
    }

    @Override
    public Object run() throws ZuulException {
        RequestContext currentContext = RequestContext.getCurrentContext();
        Long startTime = (Long) currentContext.get("startTime");
        HttpServletRequest request = currentContext.getRequest();
        String requestURI = request.getRequestURI();
        Long duration = System.currentTimeMillis() - startTime;
        log.info("uri:{},duration:{}ms", requestURI, duration / 100);
        return null;
    }
}

 

 在父模塊下再創建一個子模塊服務,作為另外幾個服務的父模塊(spring-cloud-service)

  • 刪掉不需要的src文件夾
  • 在pom.xml中添加
<packaging>pom</packaging>

 

  • 在該模塊下,建立公共服務spring-cloud-common

在服務於服務之間,會有一些公共使用的類或方法,避免重復創建以及維護困難,建立公共模塊

  • 在pom.xml引入一些依賴
    <dependencies>
        <!-- JSON 處理工具 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.31</version>
        </dependency>
        <!-- apache 提供的一些工具類 -->
        <dependency>
            <groupId>commons-codec</groupId>
            <artifactId>commons-codec</artifactId>
            <version>1.9</version>
        </dependency>
    </dependencies>
  • 在src目錄下創建需要用到的公共類

 

在當前父模塊(spring-cloud-service)中創建一個課程服務模塊(spring-cloud-course-service)

  • 在pom.xml中引入相關依賴以及插件
    <dependencies>
        <!-- 引入 Web 功能 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--
            Eureka 客戶端, 客戶端向 Eureka Server 注冊的時候會提供一系列的元數據信息, 例如: 主機, 端口, 健康檢查url等
            Eureka Server 接受每個客戶端發送的心跳信息, 如果在某個配置的超時時間內未接收到心跳信息, 實例會被從注冊列表中移除
        -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <!-- Java Persistence API, ORM 規范 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <!-- MySQL 驅動, 注意, 這個需要與 MySQL 版本對應 -->
        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>6.0.6</version>
        </dependency>
        <!-- 通用模塊 -->
        <dependency>
            <groupId>com.vast.spring-cloud</groupId>
            <artifactId>spring-cloud-common</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>

    <!--
        SpringBoot的Maven插件, 能夠以Maven的方式為應用提供SpringBoot的支持,可以將
        SpringBoot應用打包為可執行的jar或war文件, 然后以通常的方式運行SpringBoot應用
     -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

 

  • 創建application.yml
server:
  port: 7001
  servlet:
    context-path: /course

spring:
  application:
    name: spring-cloud-course-service
  jpa:
    show-sql: true
    hibernate:
      ddl-auto: none
    properties:
      hibernate.format_sql: true
    open-in-view: false
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/test?autoReconnect=true&useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=GMT%2B8
    username: root
    password: root
    driver-class-name: com.mysql.cj.jdbc.Driver
    tomcat:
      max-active: 4
      min-idle: 2
      initial-size: 2

eureka:
  client:
    service-url:
      defaultZone: http://server1:8000/eureka/

 

  • 在啟動類中添加三個注解

@SpringBootApplication

/** 向Eureka中注冊服務  */

@EnableEurekaClient

/** 用JPA來管理數據 */

@EnableJpaAuditing

 

  • 建立實體類
package com.vast.entry;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.data.annotation.CreatedDate;
import org.springframework.data.annotation.LastModifiedDate;
import org.springframework.data.jpa.domain.support.AuditingEntityListener;

import javax.persistence.*;
import java.util.Date;

@Data
/* 表明該實體類中的setter方法是private的,需要通過Builder進行build() **/ @Builder @Entity @NoArgsConstructor @AllArgsConstructor
/** 用來通過注解自動向數據庫中插入時間 */ @EntityListeners(AuditingEntityListener.
class) @Table(name = "t_course") public class CoursePo { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Column(name = "id") /** 自增 id */ private Long id; @Column(name = "course_name", nullable = false) /** 課程名稱 */ private String courseName; @Column(name = "course_type", nullable = false) /** 課程類型 */ private Integer courseType; @Column(name = "course_icon", nullable = false) /** 課程圖標 */ private String courseIcon; @Column(name = "course_intro", nullable = false) /** 課程介紹 */ private String courseIntro; @CreatedDate @Column(name = "create_time") /** 創建時間 */ private Date createTime;
/** Basic用來表明是列,默認的,不用寫也是可以的 */ @Basic @LastModifiedDate @Column(name
= "update_time") /** 更新時間 */ private Date updateTime; }

 

  • 創建Dao
package com.vast.dao;

import com.vast.entry.CoursePo;
import org.springframework.data.jpa.repository.JpaRepository;
/** Jpa中有許多已經配置好的方法,以及查詢規則,只要按照其指定的規則來即可快速操作數據庫中的數據 */
public interface CourseDao extends JpaRepository<CoursePo, Long> {
}

 

  • 課程實現類 CourseImpl
package com.vast.service.impl;

import com.vast.service.ICourseService;
import com.vast.common.entry.Course;
import com.vast.common.entry.RequestContent;
import com.vast.dao.CourseDao;
import com.vast.entry.CoursePo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;

import java.util.Collections;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;

@Service
public class CourseImpl implements ICourseService {
    @Autowired
    private CourseDao courseDao;

    @Override
    public Course getCourseById(Long id) {
 Optional<CoursePo> course = courseDao.findById(id);
/** java8特性,Lambda表達式,判斷實體類是否為空,防止拋出空指針異常 */
return builderCoursePo(course.orElseGet(() ->
CoursePo.invalid())); } @Override public List<Course> getCourseListByIds(RequestContent requestContent) { List<Long> ids = requestContent.getIds(); if (CollectionUtils.isEmpty(ids)) { return Collections.emptyList(); } List<CoursePo> courseList = courseDao.findAllById(ids);
/** java8 特性 */
return courseList.stream().map(this::builderCoursePo) .collect(Collectors.toList()); } /** * @param course * @return * @Description 構造課程信息
* Builder使用方法
*/ public Course builderCoursePo(CoursePo course) { return Course.builder() .courseIcon(course.getCourseIcon()) .courseIntro(course.getCourseIntro()) .courseName(course.getCourseName()) .courseType(course.getCourseType() == 0 ? "SpringCloud" : "SSM") .build(); } }

 

測試類

 

 

 

  •  啟動類中添加注解

@SpringBootApplication

 

  • 測試類中添加注解

@RunWith(SpringRunner.class)

@SpringBootTest(classes = {TestCourseApplication.class}, webEnvironment = SpringBootTest.WebEnvironment.NONE)

 

 

 在當前父模塊(spring-cloud-service)中創建一個課程服務模塊(spring-cloud-user-service)

  •  在pom.xml中引入相關依賴、插件
    <dependencies>
        <!-- 引入 Web 功能 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--
            Eureka 客戶端, 客戶端向 Eureka Server 注冊的時候會提供一系列的元數據信息, 例如: 主機, 端口, 健康檢查url等
            Eureka Server 接受每個客戶端發送的心跳信息, 如果在某個配置的超時時間內未接收到心跳信息, 實例會被從注冊列表中移除
        -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <!-- 引入 Feign, 可以以聲明的方式調用微服務 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <!-- 引入服務容錯 Hystrix 的依賴 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        </dependency>
        <!-- Java Persistence API, ORM 規范 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <!-- MySQL 驅動, 注意, 這個需要與 MySQL 版本對應 -->
        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>6.0.6</version>
        </dependency>
        <!-- 通用模塊 -->
        <dependency>
            <groupId>com.vast.spring-cloud</groupId>
            <artifactId>spring-cloud-common</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.jetbrains</groupId>
            <artifactId>annotations</artifactId>
            <version>RELEASE</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>

    <!--
        SpringBoot的Maven插件, 能夠以Maven的方式為應用提供SpringBoot的支持,可以將
        SpringBoot應用打包為可執行的jar或war文件, 然后以通常的方式運行SpringBoot應用
     -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

 

  • 在資源文件夾創建application.yml
server:
  port: 7000
  servlet:
    context-path: /user

spring:
  main:
    allow-bean-definition-overriding: true
  application:
    name: spring-cloud-user-service
  jpa:
    show-sql: true
    hibernate:
      ddl-auto: none
    properties:
      hibernate.format_sql: true
    open-in-view: false
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/test?autoReconnect=true&useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=GMT%2B8
    username: root
    password: root
    driver-class-name: com.mysql.cj.jdbc.Driver
    tomcat:
      max-active: 4
      min-idle: 2
      initial-size: 2

eureka:
  client:
    service-url:
      defaultZone: http://server1:8000/eureka/

feign:
  hystrix:
    enabled: true

 

  • 在啟動類添加注解

/** 支持Feign調用 */

@EnableFeignClients

/** 支持服務熔斷降級 */

@EnableCircuitBreaker

/** 支持JPA */

@EnableJpaAuditing

/** 支持想Eureka注冊服務 */

@EnableEurekaClient

@SpringBootApplication

 

  • 實現類UserInfoServiceImpl
package com.vast.service.impl;

import com.vast.client.ICourseFeignClient;
import com.vast.common.entry.Course;
import com.vast.common.entry.RequestContent;
import com.vast.common.entry.User;
import com.vast.dao.UserCourseDao;
import com.vast.dao.UserDao;
import com.vast.entity.UserCourseInfo;
import com.vast.entity.UserInfo;
import com.vast.service.IUserService;
import com.vast.vo.CreateUserRequestVo;
import com.vast.vo.UserCourseInfoVo;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;

import java.util.Collections;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;

@Slf4j
@Service
public class UserInfoServiceImpl implements IUserService {
    private final UserDao userDao;
    private final UserCourseDao userCourseDao;
    private final ICourseFeignClient iCourseFeignClient;

    @Autowired
    public UserInfoServiceImpl(UserDao userDao, UserCourseDao userCourseDao, ICourseFeignClient iCourseFeignClient) {
        this.userDao = userDao;
        this.userCourseDao = userCourseDao;
        this.iCourseFeignClient = iCourseFeignClient;
    }

    @Override
    public User getUserInfoById(Long id) {
        Optional<UserInfo> userInfoById = userDao.findById(id);
/** 判斷對象是否為空 */
if (!userInfoById.isPresent()) { return new User().invalidate(); } return builderUserInfo(userInfoById.get()); } @Override public User createUserInfo(CreateUserRequestVo createUserRequestVo) { /** 判斷傳的參數是否為空 */ if (!createUserRequestVo.validate()) { return User.invalidate(); } /** 判斷該用戶在用戶表中已存在 */ UserInfo userInfoByUsername = userDao.findByUsername(createUserRequestVo.getUsername()); if (null != userInfoByUsername) { return User.invalidate(); } UserInfo saveUserInfo = userDao.save(new UserInfo(createUserRequestVo.getUsername(), createUserRequestVo.getEmail())); return new User(saveUserInfo.getId(), saveUserInfo.getUsername(), saveUserInfo.getEmail()); } @Override public UserCourseInfoVo getUserCourseInfoById(Long id) { /** 根據用戶id判斷是否有該用戶 */ Optional<UserInfo> userInfoById = userDao.findById(id); if (!userInfoById.isPresent()) { return UserCourseInfoVo.invalidate(); } /** 獲取對象 */ UserInfo userInfo = userInfoById.get(); User user = new User(userInfo.getId(), userInfo.getUsername(), userInfo.getEmail()); /** 根據用戶id判斷用戶課程表中是否有該對應的信息 */ List<UserCourseInfo> allUserCourseInfoByUserId = userCourseDao.findAllByUserId(id); if (CollectionUtils.isEmpty(allUserCourseInfoByUserId)) { return new UserCourseInfoVo(Collections.emptyList(), user); } /** 如果用戶id在用戶表、用戶課程表中都存在,則用feign客戶端調用課程服務,獲取對應 * 的課程信息,並將用戶、課程信息進行返回 * */ List<Course> coursesByIds = iCourseFeignClient.getCoursesByIds(new RequestContent(allUserCourseInfoByUserId.stream() .map(UserCourseInfo::getCourseId).collect(Collectors.toList()))); return new UserCourseInfoVo(coursesByIds, user); } private User builderUserInfo(UserInfo userInfo) { return User.builder() .id(userInfo.getId()) .email(userInfo.getEmail()) .username(userInfo.getUsername()) .build(); } }

 

  • Feign調用客戶端
package com.vast.client;

import com.vast.common.entry.Course;
import com.vast.common.entry.RequestContent;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.*;

import java.util.List;
/** 1.FeignClient表明是Feign調用;
* 2.value表明是調用哪個服務實例;
* 3.fallback是表明熔斷時調用哪個類;
* 4.@RequestMapping中的請求方式以及URL和所調用的服務的控制層中的保持一致
*/ @FeignClient(value
= "spring-cloud-course-service", fallback = CourseHystrixClient.class) public interface ICourseFeignClient { @RequestMapping(value = "/get/course/", method = RequestMethod.GET) public Course getCourseInfoById(Long id); @RequestMapping(value = "/get/courses", method = RequestMethod.POST) public List<Course> getCoursesByIds(@RequestBody RequestContent requestContent); }

 

  • Hystrix
package com.vast.client;

import com.vast.common.entry.Course;
import com.vast.common.entry.RequestContent;
import org.springframework.stereotype.Component;

import java.util.Collections;
import java.util.List;
/** 1.@Component聲明該類是spring的bean實例;
* 2.實現Feign客戶端接口方法;
* 3.進行熔斷處理;
*/
@Component
public class CourseHystrixClient implements ICourseFeignClient { @Override public Course getCourseInfoById(Long id) { return Course.inValidEntry(); } @Override public List<Course> getCoursesByIds(RequestContent requestContent) { return Collections.emptyList(); } }

 

測試類

 

  •  啟動類中添加注解

@EnableFeignClients(basePackages = {"com.vast"})

@SpringBootApplication

 

  • 測試類中添加注解

@RunWith(SpringRunner.class)

@SpringBootTest(classes = CourseApplication.class)

 

效果圖

 


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