Spring Cloud 纯干货,从入门到实战

陈彦斌 2020-11-10 00:28:18
spring 实战 入门 干货 Cloud


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

  1. SpringBoot整合SpringCloud
  2. 通信方式:http restful
  3. 注册中心:eruka
  4. 断路器:hystrix
  5. 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

微服务网关Zuul

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>2.2.11.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.ybchen</groupId>
<artifactId>api-gateway</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>api-gateway</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Hoxton.SR8</spring-cloud.version>
</properties>
<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.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</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

application.properties

server.port=8800
# 服务名称
spring.application.name=api-gateway
# 将服务注册到注册中心,eureka_service的地址
eureka.client.service-url.defaultZone:http://localhost:8761/eureka/

默认访问规则

http://gateway:port/service-id/**

比如,原先下单地址:127.0.0.1:8781/api/v1/order/save?user_id=1&product_id=1

现在下单地址:127.0.0.1:8800/order-service/api/v1/order/save?user_id=1&product_id=1

自定义路由规则

添加application.properties信息

 

# 自定义路由规则,语法:zuul.routes.服务名=自定义路由
zuul.routes.order-service=/apigate/**
# 不让默认的服务对外暴露接口,语法:zuul.ignored-patterns=服务名
zuul.ignored-patterns=/order-service/**
# 忽略所有服务
# zuul.ignored-patterns=*

处理http请求头为空的问题

  默认zuul过滤3个值("Cookie", "Set-Cookie", "Authorization"),解决版本,设置为不过滤

源码解读

添加属性

# 处理http请求头为空的问题
zuul.sensitive-headers=

自定义Zuul过滤器之登录鉴权

改造api-gateway项目

新建LoginFilter类

新建该类,并继承ZuulFilter,重写里面的方法

 

package com.ybchen.apigateway.filter;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;
import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.PRE_TYPE;
/**
* @ClassName:LoginFilter
* @Description:登录过滤器
* @Author:chenyb
* @Date:2020/11/8 11:16 下午
* @Versiion:1.0
*/
@Component //让Spring扫描到
public class LoginFilter extends ZuulFilter {
/**
* 过滤类型,有以下类型
* 1、pre
* 2、route
* 3、post
* 4、error
*
* @return
*/
@Override
public String filterType() {
return PRE_TYPE;
}
/**
* 过滤器顺序,越小越先执行
*
* @return
*/
@Override
public int filterOrder() {
return 4;
}
/**
* 过滤器是否生效
*
* @return
*/
@Override
public boolean shouldFilter() {
//1、获取上下文
RequestContext currentContext = RequestContext.getCurrentContext();
//2、获取HttpServletRequest
HttpServletRequest request = currentContext.getRequest();
//3、拿到请求路径,判断是否进行拦截
//System.out.println(request.getRequestURL()); //http://127.0.0.1:8800/apigate/order/api/v1/order/save
//System.out.println(request.getRequestURI()); ///apigate/order/api/v1/order/save
String url = request.getRequestURI();
System.out.println("请求路径url=========>" + url);
if ((url == null ? "" : url.toLowerCase()).startsWith("/apigate/order")) {
return true;
}
return false;
}
/**
* 过滤器逻辑,业务逻辑
*
* @return
* @throws ZuulException
*/
@Override
public Object run() throws ZuulException {
System.out.println("请求被拦截啦==============");
//JWT方式
//1、获取上下文
RequestContext currentContext = RequestContext.getCurrentContext();
//2、获取HttpServletRequest
HttpServletRequest request = currentContext.getRequest();
//3、拿到token
String token = request.getHeader("token"); //请求头拿token
if (token == null || "".equals(token)) {
token = request.getParameter("token"); //get方式拿token
 }
//登录校验逻辑,这里推荐JWT方式,做登录鉴权
if (token == null || "".equals(token)) {
//4、不让继续往下走
currentContext.setSendZuulResponse(false);
//5、设置状态码,401,Unauthorized
 currentContext.setResponseStatusCode(HttpStatus.UNAUTHORIZED.value());
sendJsonMessage(currentContext.getResponse(),"用户未登录");
}
return null;
}
/**
* 响应json数据给前端
*
* @param response
* @param obj
*/
private void sendJsonMessage(HttpServletResponse response, Object obj) {
try {
ObjectMapper objectMapper = new ObjectMapper();
response.setContentType("application/json;charset=utf-8");
PrintWriter writer = response.getWriter();
writer.print(objectMapper.writeValueAsString(obj));
writer.close();
writer.flush();
} catch (Exception e) {
e.printStackTrace();
}
}
}

用户登录鉴权测试

补充

登录鉴权,推荐使用JWT方式,下面我提供我之前的一个项目,JWT的工具类,和拦截器的部分关键代码

 <dependency>
<groupId>io.jsonwebtoken</groupId>
<artifactId>jjwt</artifactId>
<version>0.7.0</version>
</dependency>
pom.xml依赖
package net.ybclass.online_ybclass.utils;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import net.ybclass.online_ybclass.model.entity.User;
import java.util.Date;
/**
* JWT工具类
* 注意点:
* 1、生成的token,是可以通过base64进行解密出铭文信息
* 2、base64进行解密出明文信息,修改再进行编码,则会解密失败
* 3、无法作废已颁布的token,除非改密钥
*/
public class JWTUtils {
/**
* 过期时间,一周
*/
static final long EXPIRE = 60000 * 60 * 24 * 7;
/**
* 加密密钥
*/
private static final String SECRET = "ybclass.net168";
/**
* 令牌前缀
*/
private static final String TOKEN_PREFIX = "ybclass";
/**
* 主题
*/
private static final String SUBJECT = "ybclass";
/**
* 根据用户信息,生成令牌
*
* @param user
* @return
*/
public static String geneJsonWebToken(User user) {
String token = Jwts.builder().setSubject(SUBJECT)
.claim("head_img", user.getHeadImg())
.claim("id", user.getId())
.claim("name", user.getName())
.setIssuedAt(new Date()) //令牌颁布时间
.setExpiration(new Date(System.currentTimeMillis() + EXPIRE)) //过期时间
.signWith(SignatureAlgorithm.HS256, SECRET) //加密方式
 .compact();
token = TOKEN_PREFIX + token;
return token;
}
/**
* 校验token方法
*
* @param token
* @return
*/
public static Claims checkJWT(String token) {
try {
final Claims claims = Jwts.parser()
.setSigningKey(SECRET)
.parseClaimsJws(token.replace(TOKEN_PREFIX, ""))
.getBody();
return claims;
} catch (Exception e) {
return null;
}
}
}
JWTUtils.java
try {
String accesToken = request.getHeader("token");
if (accesToken == null) {
accesToken = request.getParameter("token");
}
if (StringUtils.isNoneBlank(accesToken)) {
Claims claims = JWTUtils.checkJWT(accesToken);
if (claims == null) {
sendJsonMessage(response, JsonData.buildError("登陆过期,请重新登陆"));
//告诉登陆过期,重新登陆
return false;
}
Integer id = (Integer) claims.get("id");
String name = (String) claims.get("name");
request.setAttribute("user_id", id);
request.setAttribute("name", name);
return true;
}
} catch (Exception e) {
}
//登陆失败
sendJsonMessage(response, JsonData.buildError("登陆过期,请重新登陆"));
return false;
=================
User user = userMapper.findByPhoneAndPwd(phone, CommonUtils.MD5(pwd));
return user == null ? null : JWTUtils.geneJsonWebToken(user);
拦截器部分代码

网关Zuul接口限流

采用谷歌guava框架,网关限流

改造api-gateway项目

创建OrderRatelimiterFilter

然后继承ZuulFilter,并使用springcloud继承的guava技术,只针对订单接口限流!!!

 

package com.ybchen.apigateway.filter;
import com.google.common.util.concurrent.RateLimiter;
import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.springframework.http.HttpStatus;
import javax.servlet.http.HttpServletRequest;
import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.PRE_TYPE;
/**
* @ClassName:OrderRateLimiterFilter
* @Description:订单接口限流
* @Author:chenyb
* @Date:2020/11/9 11:32 下午
* @Versiion:1.0
*/
public class OrderRateLimiterFilter extends ZuulFilter {
//限流令牌,每秒创建多少令牌,注意:springcloud 默认集成guava
private static final RateLimiter RATE_LIMITER = RateLimiter.create(1000);
@Override
public String filterType() {
return PRE_TYPE;
}
@Override
public int filterOrder() {
return -4;
}
@Override
public boolean shouldFilter() {
//1、获取上下文
RequestContext currentContext = RequestContext.getCurrentContext();
//2、获取HttpServletRequest
HttpServletRequest request = currentContext.getRequest();
String url = request.getRequestURI();
System.out.println("限流请求路径url=========>" + url);
//只对订单接口限流
if ((url == null ? "" : url.toLowerCase()).startsWith("/apigate/order")) {
return true;
}
return false;
}
@Override
public Object run() throws ZuulException {
RequestContext currentContext = RequestContext.getCurrentContext();
HttpServletRequest request = currentContext.getRequest();
if (!RATE_LIMITER.tryAcquire()) {
currentContext.setSendZuulResponse(false);
currentContext.setResponseStatusCode(HttpStatus.TOO_MANY_REQUESTS.value());
}
return null;
}
}

Zuul集群

技术栈:nginx+lvs+keepalive

案例源码下载

链接: https://pan.baidu.com/s/1bNIh-8nSCMcU7FjVVzlBnA 密码: 4wf9

 

版权声明
本文为[陈彦斌]所创,转载请带上原文链接,感谢
https://www.cnblogs.com/chenyanbin/p/13908389.html

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