Spring Cloud 纯干货，从入门到实战

导读

　　之前写过一篇SpringCloud从入门到精通的点我直达，微服务基础知识点我直达，今天我们使用Spring Cloud模拟一个电商项目。分别有以下2个服务，商品、订单。下面我们开始叭

技术栈

SpringBoot整合SpringCloud
通信方式：http restful
注册中心：eruka
断路器：hystrix
网关：zuul

商品服务

功能点

商品列表
商品详情

订单服务

功能点

我的订单
下单接口

搭建Eureka Server

创建项目

项目结构

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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.18.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.ybchen</groupId>
    <artifactId>eureka_server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>eureka_server</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR6</spring-cloud.version>
    </properties>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

启动类上加注解

application.properties

# 服务端口号
server.port=8761
# eureka主机名
eureka.instance.hostname=localhost
# 指定当前主机是否需要向注册中心注册(不用，因为当前主机是Server，不是Client)
eureka.client.register-with-eureka=false
# 指定当前主机是否需要获取注册信息(不用，因为当前主机是Server，不是Client)
eureka.client.fetch-registry=false
# 注册中心地址
eureka.client.service-url.defaultZone=http://${eureka.instance.hostname}:${server.port}/eureka/

启动服务并查看监控台

搭建Eureka Client商品服务

创建项目

项目结构

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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.18.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.ybchen</groupId>
    <artifactId>product_service</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>product_service</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR6</spring-cloud.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-netflix-eureka-client</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

View Code

application.properties

# 服务端口号
server.port=8771
# 服务名称
spring.application.name=product_service
# 将服务注册到注册中心，eureka_service的地址
eureka.client.service-url.defaultZone:http://localhost:8761/eureka/

ProductController.java

package com.ybchen.product_service.controller;

import com.ybchen.product_service.service.ProductService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

/**
 * @ClassName：ProductController
 * @Description：商品
 * @Author：chenyb
 * @Date：2020/11/1 8:42 下午
 * @Versiion：1.0
 */
@RestController
@RequestMapping("/api/v1/product")
public class ProductController {
    @Autowired
    private ProductService productService;

    /**
     * 商品列表
     *
     * @return
     */
    @PostMapping("list")
    public Object list() {
        return productService.listProduct();
    }

    /**
     * 根据id查询商品
     *
     * @param id
     * @return
     */
    @GetMapping("findById")
    public Object findById(@RequestParam("id") int id) {
        return productService.findById(id);
    }
}

Product.java

package com.ybchen.product_service.domain;

import java.io.Serializable;

/**
 * @ClassName：Product
 * @Description：商品实体类
 * @Author：chenyb
 * @Date：2020/11/1 8:43 下午
 * @Versiion：1.0
 */
public class Product implements Serializable {
    /**
     * 内码
     */
    private String id;
    /**
     * 商品名称
     */
    private String name;
    /**
     * 价格，分为单位
     */
    private int price;
    /**
     * 库存
     */
    private int store;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }

    public int getStore() {
        return store;
    }

    public void setStore(int store) {
        this.store = store;
    }

    public Product() {

    }

    public Product(String id, String name, int price, int store) {
        this.id = id;
        this.name = name;
        this.price = price;
        this.store = store;
    }

    @Override
    public String toString() {
        return "product{" +
                "id='" + id + '\'' +
                ", name='" + name + '\'' +
                ", price=" + price +
                ", store=" + store +
                '}';
    }
}

View Code

ProductService.java

package com.ybchen.product_service.service;

import com.ybchen.product_service.domain.Product;

import java.util.List;

/**
 * @ClassName：ProductService
 * @Description：商品service
 * @Author：chenyb
 * @Date：2020/11/1 8:45 下午
 * @Versiion：1.0
 */
public interface ProductService {
    /**
     * 商品列表
     * @return
     */
    List<Product> listProduct();

    /**
     * 根据id查询商品
     * @param id
     * @return
     */
    Product findById(int id);
}

ProductServiceImpl.java

package com.ybchen.product_service.service.impl;

import com.ybchen.product_service.domain.Product;
import com.ybchen.product_service.service.ProductService;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import java.util.*;

/**
 * @ClassName：ProductServiceImpl
 * @Description：ProductService实现类
 * @Author：chenyb
 * @Date：2020/11/1 8:47 下午
 * @Versiion：1.0
 */
@Service
public class ProductServiceImpl implements ProductService {
    //初始化内存商品数据。模拟数据库中存储的商品
    private static final Map<Integer, Product> daoMap = new HashMap<>();

    @Value("${server.port}")
    private String port;
    static {
        for (int i = 0; i < 5; i++) {
            daoMap.put(i, new Product(i + "", "iphone_" + i, 1000 * i, 10));
        }
    }

    @Override
    public List<Product> listProduct() {
        Collection<Product> values = daoMap.values();
        return new ArrayList<>(values);
    }

    @Override
    public Product findById(int id) {
        Product product = daoMap.get(id);
        product.setName(product.getName()+"_"+port);
        return product;
    }
}

ProductServiceApplication.java

package com.ybchen.product_service;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class ProductServiceApplication {

    public static void main(String[] args) {
        SpringApplication.run(ProductServiceApplication.class, args);
    }

}

启动并查看监控台

　　启动2个服务，并查看监控台

搭建Eureka Client订单服务

创建项目

项目结构

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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.18.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.ybchen</groupId>
    <artifactId>order_service</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>order_service</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR6</spring-cloud.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-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.properties

# 服务端口号
server.port=8781
# 服务名称
spring.application.name=order-service
# 将服务注册到注册中心，eureka_service的地址
eureka.client.service-url.defaultZone:http://localhost:8761/eureka/

OrderServiceApplication.java

　　启动类添加Ribbon注解

    @Bean
    @LoadBalanced
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

package com.ybchen.order_service;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
public class OrderServiceApplication {
    /**
     * 负载均衡Ribbon
     * @return
     */
    @Bean
    @LoadBalanced
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

    public static void main(String[] args) {
        SpringApplication.run(OrderServiceApplication.class, args);
    }

}

OrderController.java

package com.ybchen.order_service.controller;

import com.ybchen.order_service.service.ProductOrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("api/v1/order")
public class OrderController {
    @Autowired
    private ProductOrderService productOrderService;
    @RequestMapping("save")
    public Object save(@RequestParam("user_id")int userId,@RequestParam("product_id")int productId){
        return productOrderService.save(userId,productId);
    }
}

ProductOrder.java

package com.ybchen.order_service.domain;

import java.util.Date;

/**
 * 商品订单实体类
 */
public class ProductOrder {
    /**
     * 主键
     */
    private int id;
    /**
     * 商品名称
     */
    private String productName;
    /**
     * 订单流水号
     */
    private String tradeNo;
    /**
     * 价格，以分位单位
     */
    private int price;
    /**
     * 创建时间
     */
    private Date createTime;
    /**
     * 用户id
     */
    private String userId;
    /**
     * 用户名称
     */
    private String userName;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getProductName() {
        return productName;
    }

    public void setProductName(String productName) {
        this.productName = productName;
    }

    public String getTradeNo() {
        return tradeNo;
    }

    public void setTradeNo(String tradeNo) {
        this.tradeNo = tradeNo;
    }

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

    public String getUserId() {
        return userId;
    }

    public void setUserId(String userId) {
        this.userId = userId;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    @Override
    public String toString() {
        return "ProductOrder{" +
                "id=" + id +
                ", productName='" + productName + '\'' +
                ", tradeNo='" + tradeNo + '\'' +
                ", price=" + price +
                ", createTime=" + createTime +
                ", userId='" + userId + '\'' +
                ", userName='" + userName + '\'' +
                '}';
    }
}

View Code

ProductOrderService.java

package com.ybchen.order_service.service;

import com.ybchen.order_service.domain.ProductOrder;

public interface ProductOrderService {
    ProductOrder save(int userId, int productId);
}

ProductOrderServiceImpl.java

package com.ybchen.order_service.service.impl;

import com.ybchen.order_service.domain.ProductOrder;
import com.ybchen.order_service.service.ProductOrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

/**
 * @ClassName：ProductOrderServiceImpl
 * @Description：产品订单实现类
 * @Author：chenyb
 * @Date：2020/11/2 11:34 下午
 * @Versiion：1.0
 */
@Service
public class ProductOrderServiceImpl implements ProductOrderService {
    @Autowired
    private RestTemplate restTemplate;
    /**
     * 下单接口
     * @param userId 用户id
     * @param productId 产品id
     * @return
     */
    @Override
    public ProductOrder save(int userId, int productId) {
        Object obj=productId;
        //get方式
        Object forObject = restTemplate.getForObject("http://product-service/api/v1/product/findById?id=" + productId, Object.class);
        //post方式
//        Map<String,String> map=new HashMap<>();
//        map.put("id","1");
//        String s = restTemplate.postForObject("http://product-service/api/v1/product/test", map, String.class);
//        System.out.println(s);
        System.out.println(forObject);
        //获取商品详情
        ProductOrder productOrder=new ProductOrder();
        productOrder.setTradeNo(UUID.randomUUID().toString());
        productOrder.setCreateTime(new Date());
        productOrder.setUserId(userId+"");
        return productOrder;
    }
}

测试负载均衡

feign实战

简介

　　改造订单服务，调用商品服务获取商品信息

官网例子

点我直达

改造订单服务

添加feign依赖

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.18.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.ybchen</groupId>
    <artifactId>order_service</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>order_service</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR6</spring-cloud.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-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--openfeign依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

启动类上添加注解

　　启动类上添加：@EnableFeignClients

添加一个接口

ProductClient.java

package com.ybchen.order_service.service;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

/**
 * 商品服务客户端
 */
// name=商品服务的服务名==========》spring.application.name=product-service
@FeignClient(name = "product-service")
@RequestMapping("/api/v1/product")
public interface ProductClient {

    @GetMapping("findById")
    String findById(@RequestParam("id") int id);
}

修改ProductOrderServiceImpl.java

原先

package com.ybchen.order_service.service.impl;

import com.ybchen.order_service.domain.ProductOrder;
import com.ybchen.order_service.service.ProductOrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

/**
 * @ClassName：ProductOrderServiceImpl
 * @Description：产品订单实现类
 * @Author：chenyb
 * @Date：2020/11/2 11:34 下午
 * @Versiion：1.0
 */
@Service
public class ProductOrderServiceImpl implements ProductOrderService {
    @Autowired
    private RestTemplate restTemplate;
    /**
     * 下单接口
     * @param userId 用户id
     * @param productId 产品id
     * @return
     */
    @Override
    public ProductOrder save(int userId, int productId) {
        Object obj=productId;
        //get方式
        Object forObject = restTemplate.getForObject("http://product-service/api/v1/product/findById?id=" + productId, Object.class);
        //post方式
//        Map<String,String> map=new HashMap<>();
//        map.put("id","1");
//        String s = restTemplate.postForObject("http://product-service/api/v1/product/test", map, String.class);
//        System.out.println(s);
        System.out.println(forObject);
        //获取商品详情
        ProductOrder productOrder=new ProductOrder();
        productOrder.setTradeNo(UUID.randomUUID().toString());
        productOrder.setCreateTime(new Date());
        productOrder.setUserId(userId+"");
        return productOrder;
    }
}

修改为

package com.ybchen.order_service.service.impl;

import com.ybchen.order_service.domain.ProductOrder;
import com.ybchen.order_service.service.ProductClient;
import com.ybchen.order_service.service.ProductOrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.Date;
import java.util.UUID;

/**
 * @ClassName：ProductOrderServiceImpl
 * @Description：产品订单实现类
 * @Author：chenyb
 * @Date：2020/11/2 11:34 下午
 * @Versiion：1.0
 */
@Service
public class ProductOrderServiceImpl implements ProductOrderService {
    @Autowired
    private ProductClient productClient;

    /**
     * 下单接口
     *
     * @param userId    用户id
     * @param productId 产品id
     * @return
     */
    @Override
    public ProductOrder save(int userId, int productId) {
        //-----------调用商品服务开始------------
        String byId = productClient.findById(productId);
        System.out.println(byId);
        //-----------调用商品服务结束------------
        //获取商品详情
        ProductOrder productOrder = new ProductOrder();
        productOrder.setTradeNo(UUID.randomUUID().toString());
        productOrder.setCreateTime(new Date());
        productOrder.setUserId(userId + "");
        return productOrder;
    }
}

测试商品服务

补充(设置服务调用超时时间)

　　默认连接10秒，读取60秒，但是由于hystrix默认是1秒超时

官网案例，点我直达

application.properties

# 设置连接和读取超时时间
feign.client.config.default.connect-timeout=5000
feign.client.config.default.read-timeout=1100

服务降级熔断(Hystrix)

为什么要用？

　　在一个分布式系统里，一个服务依赖多个服务，可能存在某个服务调用失败，比如超时、异常等，如何能保证在一个依赖出问题的情况下，不会导致整体服务故障，可以通过Hystrix来解决。

官网例子

　　点我直达

修改订单服务

添加依赖

        <!--hystrix依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        </dependency>

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.18.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.ybchen</groupId>
    <artifactId>order_service</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>order_service</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR6</spring-cloud.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-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--openfeign依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <!--hystrix依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

View Code

启动类加注解

　　@EnableCircuitBreaker

修改控制层

　　添加注解，@HystrixCommand，并定义回调方法，返回值、入参必须一致！！！！

入参、返回值，不一致会报错

feign结合Hystrix

修改订单服务

开启hystrix

# 开启hystrix
feign.hystrix.enabled=true

ProductClient.java

package com.ybchen.order_service.service;

import com.ybchen.order_service.fallback.ProductClientFallBack;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.*;

/**
 * 商品服务客户端
 */
// name=商品服务的服务名==========》spring.application.name=product-service
@FeignClient(name = "product-service",fallback = ProductClientFallBack.class)
//@RequestMapping("/api/v1/product")
public interface ProductClient {

    @GetMapping("/api/v1/product/findById")
    String findById(@RequestParam("id") int id);
}

ProductClientFallBack.java

package com.ybchen.order_service.fallback;

import com.ybchen.order_service.service.ProductClient;
import org.springframework.stereotype.Component;

/**
 * 针对商品服务，做降级处理
 */
@Component
public class ProductClientFallBack implements ProductClient {
    @Override
    public String findById(int id) {
        System.out.println("商品服务被降级了~~~~~~~");
        return null;
    }
}

验证商品服务熔断

　　为什么对商品服务做了熔断，还返回这个结果呢，那是因为service实现类，内部发生了错误

熔断降级服务报警通知(重要)

　　下面写一些伪代码，比如：xxx微服务挂了，然后通过短信、邮件的方式，通知相应的开发人员，紧急处理事故等。

修改订单服务

修改hystrix超时时间

禁用超时时间(不推荐)

hystrix.command.default.execution.timeout.enabled=false

设置超时时间(推荐)

hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=4000

源码位置讲解

　　通过这种方法，还可以设置更多的hystrix默认值

断路器Dashboard监控仪表盘

修改订单服务

添加依赖

        <!--hystrix仪表盘-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.18.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.ybchen</groupId>
    <artifactId>order_service</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>order_service</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR6</spring-cloud.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-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--openfeign依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <!--hystrix依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        </dependency>
        <!--hystrix仪表盘-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

pom.xml

启动类上加注解

　　添加：@EnableHystrixDashboard

修改配置文件

# 暴露全部的监控信息
management.endpoints.web.exposure.include=*

访问仪表盘

http://127.0.0.1:8781/hystrix

http://127.0.0.1:8781/actuator/hystrix.stream

　　仪表盘实际工作中用处不大(仁者见仁智者见智)，纯属学习用，具体参数，请自行百度，只要把微服务熔断/降级报警通知处理好，比啥都好

本文链接：https://www.cnblogs.com/chenyanbin/p/13908389.html

Spring Cloud 纯干货，从入门到实战

导读

技术栈

商品服务

功能点

订单服务

功能点

搭建Eureka Server

创建项目

项目结构

pom.xml

启动类上加注解

application.properties

启动服务并查看监控台

搭建Eureka Client商品服务

创建项目

项目结构

pom.xml

application.properties

ProductController.java

Product.java

ProductService.java

ProductServiceImpl.java

ProductServiceApplication.java

启动并查看监控台

搭建Eureka Client订单服务

创建项目

项目结构

pom.xml

application.properties

OrderServiceApplication.java

OrderController.java

ProductOrder.java

ProductOrderService.java

ProductOrderServiceImpl.java

测试负载均衡

feign实战

简介

官网例子

改造订单服务

添加feign依赖

启动类上添加注解

添加一个接口

修改ProductOrderServiceImpl.java

测试商品服务

补充(设置服务调用超时时间)

服务降级熔断(Hystrix)

为什么要用？

官网例子

修改订单服务

添加依赖

启动类加注解

修改控制层

feign结合Hystrix

修改订单服务

开启hystrix

ProductClient.java

ProductClientFallBack.java

验证商品服务熔断

熔断降级服务报警通知(重要)

修改订单服务

修改hystrix超时时间

禁用超时时间(不推荐)

设置超时时间(推荐)

源码位置讲解

断路器Dashboard监控仪表盘

修改订单服务

添加依赖

启动类上加注解

修改配置文件

访问仪表盘

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