Spring cloud pure dry goods, from introduction to actual combat

Irving the procedural ape 2020-11-10 01:15:13
spring cloud pure dry goods


Reading guide

I wrote one before SpringCloud From beginners to proficient points, I go straight to , Basic knowledge of micro service , Today we use Spring Cloud Simulate an e-commerce project . They are as follows 2 A service , goods 、 Order . Now let's start

Technology stack

  1. SpringBoot Integrate SpringCloud
  2. communication mode :http restful
  3. Registry Center :eruka
  4. Circuit breaker :hystrix
  5. gateway :zuul

Goods and services

The function point

  • List of goods
  • Goods details

Order service

The function point

  • My order
  • Order interface

build Eureka Server

Create project

Project structure

pom.
<??><project ="http://maven.apache.org/POM/4.0.0" ="http://www.w3.org/2001/ 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>

Annotate the startup class

application.properties

# Service port number server.port=8761# eureka Host name eureka.instance.hostname=localhost# Specifies whether the current host needs to register with the registry ( no need , Because the current host is Server, No Client)eureka.client.register-with-eureka=false# Specifies whether the current host needs to obtain registration information ( no need , Because the current host is Server, No Client)eureka.client.fetch-registry=false# Address of Registration Center eureka.client.service-url.defaultZone=http://${eureka.instance.hostname}:${server.port}/eureka/

Start the service and check the monitor station

build Eureka Client Goods and services

Create project

Project structure

pom.
<??><project ="http://maven.apache.org/POM/4.0.0" ="http://www.w3.org/2001/ 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

# Service port number server.port=8771# The service name spring.application.name=product_service# Register the service with the registry ,eureka_service The address of eureka.client.service-url.defaultZone >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: goods * @Author:chenyb * @Date:2020/11/1 8:42 Afternoon * @Versiion:1.0 */@RestController@RequestMapping("/api/v1/product")public class ProductController { @Autowired private ProductService productService; /** * List of goods * * @return */ @PostMapping("list") public Object list() { return productService.listProduct(); } /** * according to id Query products * * @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: Commodity entity class * @Author:chenyb * @Date:2020/11/1 8:43 Afternoon * @Versiion:1.0 */public class Product implements Serializable { /** * Internal code */ private String id; /** * Name of commodity */ private String name; /** * Price , Divided into units */ private int price; /** * stock */ 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: goods service * @Author:chenyb * @Date:2020/11/1 8:45 Afternoon * @Versiion:1.0 */public interface ProductService { /** * List of goods * @return */ List<Product> listProduct(); /** * according to id Query products * @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 Implementation class * @Author:chenyb * @Date:2020/11/1 8:47 Afternoon * @Versiion:1.0 */@Servicepublic class ProductServiceImpl implements ProductService { // Initialize memory commodity data . Simulate the goods stored in the database 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;@SpringBootApplicationpublic class ProductServiceApplication { public static void main(String[] args) { SpringApplication.run(ProductServiceApplication.class, args); }}

Start up and check the monitor station

start-up 2 A service , And check the monitor station

build Eureka Client Order service

Create project

Project structure

 

pom.
<??><project ="http://maven.apache.org/POM/4.0.0" ="http://www.w3.org/2001/ 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

# Service port number server.port=8781# The service name spring.application.name=order-service# Register the service with the registry ,eureka_service The address of eureka.client.service-url.defaultZone Startup class add Ribbon annotation 

 @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;@SpringBootApplicationpublic class OrderServiceApplication { /** * Load balancing 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;/** * Commodity order entity class */public class ProductOrder { /** * Primary key */ private int id; /** * Name of commodity */ private String productName; /** * Order serial number */ private String tradeNo; /** * Price , In quantile units */ private int price; /** * Creation time */ private Date createTime; /** * user id */ private String userId; /** * User name */ 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: Product order implementation class * @Author:chenyb * @Date:2020/11/2 11:34 Afternoon * @Versiion:1.0 */@Servicepublic class ProductOrderServiceImpl implements ProductOrderService { @Autowired private RestTemplate restTemplate; /** * Order interface * @param userId user id * @param productId product id * @return */ @Override public ProductOrder save(int userId, int productId) { Object obj=productId; //get The way Object forObject = restTemplate.getForObject("http://product-service/api/v1/product/findById?id=" + productId, Object.class); //post The way // Map<String,String> map=new HashMap<>();// map.put("id","1");// String s = restTemplate.postForObject("", map, String.class);// System.out.println(s); System.out.println(forObject); // Get product details ProductOrder productOrder=new ProductOrder(); productOrder.setTradeNo(UUID.randomUUID().toString()); productOrder.setCreateTime(new Date()); productOrder.setUserId(userId+""); return productOrder; }}

Test load balancing

feign actual combat

brief introduction

Transform order service , Call commodity service to get product information

Website example

Point me direct.

Transform order service

add to feign rely on

 <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> </dependency>
<??><project ="http://maven.apache.org/POM/4.0.0" ="http://www.w3.org/2001/ 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 rely on --> <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>

Add comments to the startup class

Add on startup class :@EnableFeignClients

 

Add an interface

 

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;/** * Commodity Services client */// name= Service name of commodity service ==========》spring.application.name=product-service@FeignClient(name = "product-service")@RequestMapping("/api/v1/product")public interface ProductClient { @GetMapping("findById") String findById(@RequestParam("id") int id);}

modify ProductOrderServiceImpl.java

The original

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: Product order implementation class * @Author:chenyb * @Date:2020/11/2 11:34 Afternoon * @Versiion:1.0 */@Servicepublic class ProductOrderServiceImpl implements ProductOrderService { @Autowired private RestTemplate restTemplate; /** * Order interface * @param userId user id * @param productId product id * @return */ @Override public ProductOrder save(int userId, int productId) { Object obj=productId; //get The way Object forObject = restTemplate.getForObject("http://product-service/api/v1/product/findById?id=" + productId, Object.class); //post The way // Map<String,String> map=new HashMap<>();// map.put("id","1");// String s = restTemplate.postForObject("", map, String.class);// System.out.println(s); System.out.println(forObject); // Get product details ProductOrder productOrder=new ProductOrder(); productOrder.setTradeNo(UUID.randomUUID().toString()); productOrder.setCreateTime(new Date()); productOrder.setUserId(userId+""); return productOrder; }}

It is amended as follows

 

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: Product order implementation class * @Author:chenyb * @Date:2020/11/2 11:34 Afternoon * @Versiion:1.0 */@Servicepublic class ProductOrderServiceImpl implements ProductOrderService { @Autowired private ProductClient productClient; /** * Order interface * * @param userId user id * @param productId product id * @return */ @Override public ProductOrder save(int userId, int productId) { //----------- Call the commodity service to start ------------ String byId = productClient.findById(productId); System.out.println(byId); //----------- Call commodity service end ------------ // Get product details ProductOrder productOrder = new ProductOrder(); productOrder.setTradeNo(UUID.randomUUID().toString()); productOrder.setCreateTime(new Date()); productOrder.setUserId(userId + ""); return productOrder; }}

Testing goods and services

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