SpringCloud第一弹(入门)

使用IDEA建立SpringBoot多模块工程不爽啊~算了凑合用吧。

第一步、建立一个POM工程

..Next

..一路next即可，中间啥也不选

第二步、建立Eureka服务器（这个玩意等同于玩Dubbo时候的Zookeeper）

在项目上右键--

..还是Springboot

..

..选择依赖

..一路next即可

修改application.properties

server.port=

# 不向注册中心注册自己
eureka.client.register-with-eureka=false
# 自己就是注册中心，职责是维护服务
eureka.client.fetch-registry=false
# 服务端实例名称
eureka.instance.hostname=localhost
#暴露的注册地址
eureka.client.service-url.defaultZone=http://localhost:8888/eureka

启动类添加注解

修改parent工程pom文件，也就是加一个module啦

    <modules>
        <module>eureka-server</module>
    </modules>

修改本工程pom文件，把parent换成你建立的cloud-parent，而cloud-parent已经依赖了 spring-boot-starter-parent

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

接下来启动，先看一下注册中心的管控台http://localhost:8888/

什么都没有。等服务提供者出来就有了。

第三步、建立Common模块

..

..

..人家目录啥都没有，所以你得自己建

book类

package com.cloud.common.entity;

import lombok.Getter;
import lombok.Setter;

import java.io.Serializable;
import java.util.Date;

@Getter
@Setter
public class Book implements Serializable {

    private Long id;
    private String bookName;    // 书名
    private String bookSize;    // 开本
    private String pack;         // 包装
    private String ISBN;         // isbn
    private String publisher;   // 出版社
    private Date publishTime;   // 出版时间

}

BaseResponse

package com.cloud.common.response;

import lombok.Getter;
import lombok.Setter;

import java.io.Serializable;

@Getter
@Setter
public class BaseResponse<T> implements Serializable {
    private int code;
    private String desc;
    private T data;

    public BaseResponse(int code, String desc) {
        this.code = code;
        this.desc = desc;
    }
}

加入依赖：

    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>

 第四步、建立服务提供者

..

..

..完成后打开pom文件，注意这个东西，这个东西在前面版本是不一样的

..

加入额外的依赖

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.46</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.10</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.6</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.9.6</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.9.6</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.47</version>
        </dependency>

在dependencies的最后加入common的依赖

   <dependency>
       <groupId>com.cloud</groupId>
       <artifactId>cloud-common</artifactId>
       <version>0.0.1-SNAPSHOT</version>
   </dependency>

把parent也改了

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

然后去父模块增加一个module

现在是代码部分：

配置文件：

server.port=8080
# 服务名
spring.application.name=BookServiceProvider

spring.jackson.date-format=yyyy-MM-dd
spring.jackson.time-zone=GMT+8

mybatis.config-location=classpath:mybatis/mybatis.xml
mybatis.mapper-locations=classpath:mybatis/mapper/**/*.xml
mybatis.type-aliases-package=com.cloud.common.entity

spring.datasource.url=jdbc:mysql://localhost:3306/cloud?useSSL=false
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.username=root
spring.datasource.password=1234

# 注册地址
eureka.client.service-url.defaultZone=http://localhost:8888/eureka
# 注册名
eureka.instance.instance-id=book-service-provider
eureka.instance.prefer-ip-address=true

info.name: book-service-provider
info.version: v1.0

启动类加上两个注解

@EnableEurekaClient
@EnableDiscoveryClient

DAO

package com.cloud.bookserviceprovider.dao;

import com.cloud.common.entity.Book;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;

import java.util.List;

@Mapper
@Repository
public interface BookDAO {

    int addBook(Book book);

    Book getBookById(@Param("id") Long id);

    List<Book> getBooks();
}

Service

package com.cloud.bookserviceprovider.service;

import com.cloud.common.entity.Book;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public interface BookService {

    int addBook(Book book);

    Book getBookById(@Param("id") Long id);

    List<Book> getBooks();
}

impl

package com.cloud.bookserviceprovider.service.impl;

import com.cloud.bookserviceprovider.dao.BookDAO;
import com.cloud.bookserviceprovider.service.BookService;
import com.cloud.common.entity.Book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class BookServiceImpl implements BookService {

    @Autowired
    private BookDAO bookDAO;

    @Override
    public int addBook(Book book) {
        return bookDAO.addBook(book);
    }

    @Override
    public Book getBookById(Long id) {
        return bookDAO.getBookById(id);
    }

    @Override
    public List<Book> getBooks() {
        return bookDAO.getBooks();
    }
}

..BookDAOMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.cloud.bookserviceprovider.dao.BookDAO">

    <insert id="addBook" parameterType="Book">
        INSERT INTO book(bookName,bookSize,pack,isbn,publisher,publishTime)
        VALUES(#{bookName},#{bookSize},#{pack},#{ISBN},#{publisher},#{publishTime})
    </insert>

    <select id="getBooks" resultType="Book">
        select * from book
    </select>

    <select id="getBookById" resultType="Book">
        select * from book where id=#{id}
    </select>

</mapper>
 

mybatis.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <settings>
        <!-- 打印查询语句 -->
        <setting name="logImpl" value="STDOUT_LOGGING" />
    </settings>
</configuration>

BookController

package com.cloud.bookserviceprovider.controller;

import com.alibaba.fastjson.JSONObject;
import com.cloud.bookserviceprovider.service.BookService;
import com.cloud.common.entity.Book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
@RequestMapping("/book")
public class BookController {

    @Autowired
    private BookService bookService;

    @Autowired
    private DiscoveryClient discoveryClient;

    @RequestMapping("/discovery")
    public Object discovery(){
        List<String> services = discoveryClient.getServices();
        services.forEach(e -> System.err.println(e));
        List<ServiceInstance> list = discoveryClient.getInstances("BOOKSERVICEPROVIDER");
        list.forEach(e -> {
            System.out.println(e.getServiceId() + "," + e.getHost() + "," + e.getPort() + "," + e.getUri());
        });
        return this.discoveryClient;
    }

    @RequestMapping("/add")
    public int addBook(@RequestBody Book book){
        return bookService.addBook(book);
    }

    @RequestMapping("/get/{id}")
    public Book getBookById(@PathVariable("id") Long id){
        return bookService.getBookById(id);
    }

    @RequestMapping("/getAll")
    public String getBooks(){
        return JSONObject.toJSONString(bookService.getBooks());
    }
}

数据库脚本

CREATE TABLE `book` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `bookName` varchar(55) NOT NULL,
  `bookSize` varchar(10) NOT NULL,
  `pack` varchar(10) NOT NULL,
  `isbn` varchar(55) NOT NULL,
  `publisher` varchar(55) NOT NULL,
  `publishTime` date NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

整体目录：

现在呢，先启动注册中心，再启动服务提供者，打开管理界面，出现了一个服务

你点击，会出现

这就是application.properties配置的info信息。

第五步、建立服务消费者

..

..

修改pom文件（其实跟提供者类似）

把parent改成

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

加入common依赖

        <dependency>
            <groupId>com.cloud</groupId>
            <artifactId>cloud-common</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>

父工程pom，添加module

application.properties

server.port=8081

# 注册中心地址
eureka.client.service-url.defaultZone=http://localhost:8888/eureka
# 不向注册中心注册自己
eureka.client.register-with-eureka=false

配置类

package com.cloud.bookserviceconsumer.conf;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

@Configuration
public class ConsumerConfig {

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

controller

package com.cloud.bookserviceconsumer.controller;

import com.cloud.common.entity.Book;
import com.cloud.common.response.BaseResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
@RequestMapping("/consume/book")
public class BookController {

    private static final String URL = "http://localhost:8080";

    @Autowired
    private RestTemplate restTemplate;

    @RequestMapping("/add")
    public BaseResponse<Integer> addBook(@RequestBody Book book){
        Integer integer = restTemplate.postForObject(URL + "/book/add", book, Integer.class);
        BaseResponse<Integer> response = new BaseResponse<>(0,"Success");
        response.setData(integer);
        return response;
    }

    @RequestMapping("/get/{id}")
    public ResponseEntity<Book> getBookById(@PathVariable("id") Long id){
        return restTemplate.getForEntity(URL + "/book/get/" + id,Book.class);
    }

    @RequestMapping("/getAll")
    public String getBooks(){
        String s = restTemplate.getForObject(URL + "/book/getAll", String.class);
        return s;
    }
}

最后访问

给你个示例json

{
  "bookName": "Apache Kafka实战",
  "bookSize": "16开",
  "pack": "平装",
  "isbn": "9787121337765",
  "publisher": "电子工业出版社",
  "publishTime": "2018-05-01"
}

添加操作

查询操作

最后展示一下服务发现（感觉很鸡肋），就是读取现有的服务名称

GitHub