分佈式-SpringBoot-SpringCloud-Eureka

時間 2019-11-11

標籤分佈式 springboot springcloud eureka 欄目系統架構简体版

原文原文鏈接

環境

Java version 1.8
SpringBoot version 2.1.7

搭建註冊中心 Eureka-server

pom.xml 依賴以下所示：java

<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>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>

    <dependency>
        <groupId>javax.xml.bind</groupId>
        <artifactId>jaxb-api</artifactId>
    </dependency>
    <dependency>
        <groupId>com.sun.xml.bind</groupId>
        <artifactId>jaxb-impl</artifactId>
        <version>2.3.0</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jaxb</groupId>
        <artifactId>jaxb-runtime</artifactId>
        <version>2.3.0</version>
    </dependency>
    <dependency>
        <groupId>javax.activation</groupId>
        <artifactId>activation</artifactId>
        <version>1.1.1</version>
    </dependency>

</dependencies>

配置 Eureka application.propertiesweb

# 應用啓動端口
server.port=8090

# 註冊中心管理中的 應用名稱
spring.application.name=eureka-server

# 登錄註冊管理中的的帳號密碼
spring.security.user.roles=SUPERUSER
spring.security.user.name=eureka
spring.security.user.password=123456

# 是否把本身註冊到註冊中心
eureka.client.register-with-eureka=true

# 是否從eureka上來獲取服務的註冊信息
eureka.client.fetch-registry=false

eureka.instance.hostname=localhost
eureka.client.serviceUrl.defaultZone=http://eureka:123456@localhost:8090/eureka

啓動註冊中心啓動後訪問(http://127.0.0.1:8090)spring
1. 登錄界面

2. 輸入設置的帳號密碼（user：eureka pwd：123456）

3. 進入註冊中心頁面

須要注意的是須要處理下CSRF否則服務提供者註冊不進來啓動入口文件以下

EurekaServiceApplication.javaapi

@EnableEurekaServer
@SpringBootApplication
public class EurekaServiceApplication {

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

    //忽略 uri /eureka/** 的CSRF檢測
    @EnableWebSecurity
    static class WebSecurityConfig extends WebSecurityConfigurerAdapter {
        @Override
        protected void configure(HttpSecurity http) throws Exception {
            http.csrf().ignoringAntMatchers("/eureka/**");
            super.configure(http);
        }
    }
}

簡單的註冊中心已經搭建完成

搭建服務提供者 Provider-service

首先仍是配置文件 application.propertiesapp

服務端口
server.port=8081

# 服務應用名稱
spring.application.name=provider-ticket

# 是否容許使用ip鏈接
eureka.instance.ip-address=true

# 注意 http://用戶名:密碼@主機:端口/eureka 須要與服務中內心配置的同樣
eureka.client.serviceUrl.defaultZone=http://eureka:123456@localhost:8090/eureka

啓動項目後會自動把服務註冊到配置的服務中心
如下是我作的測試代碼

TicketController.java負載均衡

package com.yourdream.providerticket.controller;

import com.yourdream.providerticket.service.TicketService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TicketController {

    @Autowired
    TicketService ticketService;

    @GetMapping("/ticket")
    public String getTicket(){
        System.out.println("server-8081");
        return ticketService.getTicket();
    }
}

TicketServiceide

package com.yourdream.providerticket.service;

import org.springframework.stereotype.Service;

@Service
public class TicketService {

    public String getTicket()
    {
        return "《哪吒之魔童降世》";
    }
}

ProviderTicketApplicationspring-boot

package com.yourdream.providerticket;

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

@SpringBootApplication
public class ProviderTicketApplication {

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

}

到此一個簡單的服務提供者搭建完成

搭建服務消費者 Consumer-user

首先仍是配置文件 application.properties

server.port=8100
spring.application.name=consumer-user
eureka.client.serviceUrl.defaultZone=http://eureka:123456@localhost:8090/eureka
eureka.instance.ip-address=true

首先須要明確消費者與服務提供者之間通信協議是HTTP
看下實例代碼

啓動入口 ConsumerUserApplication.java測試

package com.yourdream.consumeruser;

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

@EnableDiscoveryClient //開啓發現服務功能
@SpringBootApplication
public class ConsumerUserApplication {

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

    @LoadBalanced //開啓負載均衡器
    @Bean //註冊 RestTemplate 服務
    public RestTemplate restTemplate()
    {
        return new RestTemplate();
    }
}

UserController.javafetch

package com.yourdream.consumeruser.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;


@RestController
public class UserController {

    // 幫助咱們向 註冊的實例服務 發起http請求
    @Autowired
    RestTemplate restTemplate;

    @GetMapping("/buy")
    public String buyTicket(String name)
    {
        //PROVIDER-TICKET 服務提供者名稱
        String forObject = restTemplate.getForObject("http://PROVIDER-TICKET/ticket", String.class);
        return name + "購買了" + forObject;
    }
}