springcloud案例

一、父工程

　　1、项目结构

 　　2、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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.wuxi</groupId>
    <artifactId>scloud</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>pom</packaging>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.4.RELEASE</version>
    </parent>

    <modules>
        <module>EurekaServer</module>
        <module>EurekaClient</module>
        <module>EurekaClientA</module>
        <module>EurekaClientB</module>
        <module>EurekaConfig</module>
    </modules>

    <dependencyManagement>
        <dependencies>
            <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-dependencies -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Hoxton.RELEASE</version>
                <type>pom</type>
                <scope>runtime</scope>
            </dependency>
            <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-netflix-eureka-server -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
                <version>2.2.5.RELEASE</version>
            </dependency>
            <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-netflix-eureka-client -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
                <version>2.2.5.RELEASE</version>
            </dependency>
            <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-openfeign -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</artifactId>
                <version>2.2.5.RELEASE</version>
            </dependency>
            <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-netflix-zuul -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
                <version>2.2.5.RELEASE</version>
            </dependency>
            <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-config-server -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-config-server</artifactId>
                <version>2.2.5.RELEASE</version>
            </dependency>
            <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-config -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-config</artifactId>
                <version>2.2.5.RELEASE</version>
            </dependency>
            <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-bus -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-bus</artifactId>
                <version>2.2.3.RELEASE</version>
            </dependency>
            <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-stream-binder-rabbit -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-stream-binder-rabbit</artifactId>
                <version>3.0.8.RELEASE</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>com.wuxi</groupId>
            <artifactId>PublicClass</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.9</source>
                    <target>1.9</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

二、PublicClass

　　1、项目结构

　　2、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>com.wuxi</groupId>
    <artifactId>PublicClass</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.9</source>
                    <target>1.9</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

　　3、Msg.class

package com.wuxi.vo;

import java.util.HashMap;
import java.util.Map;

public class Msg {
    //状态吗 200-成功 400-失败
    private int code;
    //提示信息
    private String msg;
    //用户要返回给游览器的数据
    private Map<String, Object> extend = new HashMap<String, Object>();

    public static Msg success() {
        Msg result = new Msg();
        result.setCode(200);
        result.setMsg("处理成功!");
        return result;
    }

    public static Msg fail() {
        Msg result = new Msg();
        result.setCode(400);
        result.setMsg("处理失败!");
        return result;
    }

    //链式操作返回信息
    public Msg add(String key, Object value) {
        this.getExtend().put(key, value);
        return this;
    }


    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public Map<String, Object> getExtend() {
        return extend;
    }

    public void setExtend(Map<String, Object> extend) {
        this.extend = extend;
    }
}

三、EurekaServer

　　1、项目结构

　　2、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>
    <artifactId>EurekaServer</artifactId>

    <parent>
        <artifactId>scloud</artifactId>
        <groupId>com.wuxi</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
    </dependencies>
</project>

　　3、application.yml

server:
  port: 8081
spring:
  application:
    name: EurekaServer
eureka:
  client:
    register-with-eureka: false #Eureka服务本身无需注册
    fetch-registry: false #Eureka服务本身无需获取注册信息
    service-url:
      defaultZone: http://127.0.0.1:${server.port}/eureka/

　　4、启动类

package com.wuxi;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer
public class MyEurekaServer {
    public static void main(String[] args) {
        SpringApplication.run(MyEurekaServer.class);
    }
}

四、EurekaConfig

　　1、项目结构

　　2、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>
    <artifactId>EurekaConfig</artifactId>

    <parent>
        <artifactId>scloud</artifactId>
        <groupId>com.wuxi</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-bus</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-stream-binder-rabbit</artifactId>
        </dependency>
    </dependencies>
</project>

　　3、application.yml

server:
  port: 8085
spring:
  application:
    name: EurekaConfig
  cloud:
    config:
      server:
        git:
          uri: https://gitee.com/YiSiYiNian/cloudconfig.git #git仓库地址
  rabbitmq:
    host: 127.0.0.1
management: #暴露触发消息总线的地址
  endpoints:
    web:
      exposure:
        include: bus-refresh

　　4、启动类

package com.wuxi;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.config.server.EnableConfigServer;

@SpringBootApplication
@EnableConfigServer
public class MyApplication {
    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class);
    }
}

五、EurekaClient

　　1、项目结构

　　2、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>
    <artifactId>EurekaClient</artifactId>

    <parent>
        <artifactId>scloud</artifactId>
        <groupId>com.wuxi</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-bus</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-stream-binder-rabbit</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>
</project>

　　3、bootstrap.yml

spring:
  cloud:
    config:
      name: application #文件名-前部分
      profile: zuul #文件名-后部分
      label: master #分支
      uri: http://127.0.0.1:8085 #配置中心地址

　　4、启动类

package com.wuxi;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;

@SpringBootApplication
@EnableEurekaClient
@EnableZuulProxy
public class MyEurekaClient {
    public static void main(String[] args) {
        SpringApplication.run(MyEurekaClient.class);
    }
}

　　5、过滤器

package com.wuxi.filter;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

@Component
@RefreshScope
public class MyEurekaClientFilter extends ZuulFilter {
    /**
     * 在请求前pre或者后post执行
     *
     * @return
     */
    @Override
    public String filterType() {
        return "pre";
    }

    /**
     * 多个过滤器的执行顺序，数字越小，表示越先执行
     *
     * @return
     */
    @Override
    public int filterOrder() {
        return 0;
    }

    /**
     * 当前过滤器是否开启true表示开启
     *
     * @return
     */
    @Override
    public boolean shouldFilter() {
        return true;
    }

    @Value("${person.name}")
    private String personName;

    /**
     * 过滤器内执行的操作 return任何object的值都表示继续执行
     * RequestContext.getCurrentContext().setSendZuulResponse(false)表示不再继续执行
     *
     * @return
     * @throws ZuulException
     */
    @Override
    public Object run() throws ZuulException {
        System.out.println("********");
        System.out.println(personName);
        System.out.println("********");

        RequestContext requestContext = RequestContext.getCurrentContext();
        HttpServletRequest request = requestContext.getRequest();
        String header = request.getHeader("token");
        if (header != null && !"".equals(header)) {
            //Authorization、Cookie、Set-Cookie不会转发
            requestContext.addZuulRequestHeader("token", header);
        }
        return null;
    }
}

六、EurekaClientA

　　1、项目结构

　　2、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>
    <artifactId>EurekaClientA</artifactId>

    <parent>
        <artifactId>scloud</artifactId>
        <groupId>com.wuxi</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>
</project>

　　3、application.yml

server:
  port: 8083
spring:
  application:
    name: EurekaClientA
eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:8081/eureka/
  instance:
    prefer-ip-address: true #跨域

　　4、启动类

package com.wuxi;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
public class MyEurekaClientA {
    public static void main(String[] args) {
        SpringApplication.run(MyEurekaClientA.class);
    }
}

　　5、controller

package com.wuxi.controller;

import com.wuxi.vo.Msg;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;

@RestController
@RequestMapping("/a")
public class AController {
    @RequestMapping(value = "/amethod/{id}")
    public Msg ametohd(@PathVariable("id") Integer id, HttpServletRequest req) {
        System.out.println(req.getHeader("token"));
        return Msg.success().add("id", id);
    }
}

七、EurekaClientB

　　1、项目结构

　　2、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>
    <artifactId>EurekaClientB</artifactId>

    <parent>
        <artifactId>scloud</artifactId>
        <groupId>com.wuxi</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>
</project>

　　3、application.yml

server:
  port: 8084
spring:
  application:
    name: EurekaClientB
eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:8081/eureka/
  instance:
    prefer-ip-address: true #跨域
feign:
  hystrix:
    enabled: true

　　4、启动类

package com.wuxi;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient
@EnableFeignClients
public class MyEurekaClientB {
    public static void main(String[] args) {
        SpringApplication.run(MyEurekaClientB.class);
    }
}

　　5、feign接口

package com.wuxi.feign;

import com.wuxi.feign.impl.AFeignImpl;
import com.wuxi.vo.Msg;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

@FeignClient(value = "EurekaClientA", fallback = AFeignImpl.class)
public interface AFeign {
    @RequestMapping(value = "/a/amethod/{id}")
    Msg ametohd(@PathVariable("id") Integer id);
}

　　6、feign接口实现类

package com.wuxi.feign.impl;

import com.wuxi.feign.AFeign;
import com.wuxi.vo.Msg;
import org.springframework.stereotype.Component;

@Component
public class AFeignImpl implements AFeign {
    @Override
    public Msg ametohd(Integer id) {
        return Msg.fail().add("branch", "熔断器触发");
    }
}

　　7、controller

package com.wuxi.controller;

import com.wuxi.feign.AFeign;
import com.wuxi.vo.Msg;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/b")
public class BController {
    @Autowired
    private AFeign aFeign;

    @RequestMapping("/bmethod/{id}")
    public Msg bmethod(@PathVariable("id") Integer id) {
        return aFeign.ametohd(id);
    }
}
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原文地址：https://www.cnblogs.com/linding/p/13719485.html