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SpringCloud学习笔记(三)(狂神视频笔记)

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SpringCloud(三)

4、Rest学习环境搭建:服务提供者

  1. 总体介绍

    • 我们会使用一个Dept部门模块做一个微服务通用案例Consumer消费者(Client)通过REST调用Provider提供者(Server)提供的服务。

    • 回忆Spring,SpringMVC,MyBatis等以往学习的知识。。。

    • Maven的分包分模块架构复习

      一个简单的Maven模块结构是这样的:

      – app-parent:一个父项目(app-parent)聚合很多子项目(app-util,app-dao,app-web…)

      |-- pom.xml

      |

      |-- app-core

      ||---- pom.xml

      |

      |-- app.web

      ||---- pom.xml

      一个父项目带着多个子Module子模块

      MircroServiceCloud父工程(Project)下初次带着3个子模块(Module)

      • microservicecloud-api【封装的整体entity/接口/公共配置等】
      • microservicecloud-provider-dept-8001【服务提供者】
      • microservicecloud-consumer-dept-80【服务消费者】
  2. SpringCloud版本选择

    大版本说明:

    Spring BootSpring Cloud关系
    1.2.xAngel版本(天使)兼容Spring Boot 1.2.x
    1.3.xBrixton版本(布里克斯顿)兼容Spring Boot 1.3.x,也兼容Spring Boot 1.4.x
    1.4.xCamden版本(卡姆登)兼容Spring Boot 1.4.x,也兼容Spring Boot 1.5.x
    1.5.xDalston版本(多尔斯顿)兼容Spring Boot 1.5.x,不兼容Spring Boot 2.0.x
    1.5.xEdgware版本(埃奇韦尔)兼容Spring Boot 1.5.x,不兼容Spring Boot 2.0.x
    2.0.xFinchley版本(芬奇利)兼容Spring Boot 2.0.x,不兼容Spring Boot 1.5.x
    2.1.xGreenwich版本(格林威治)

    实际开发版本关系:

    spring-boot-starter-parentspring-boot-starter-parentspring-cloud-dependenciesspring-cloud-dependencies
    版本号发布日期版本号发布日期
    1.5.2.RELEASE2017年3月Dalston.RC12017年未知月
    1.5.9.RELEASENov,2017Edgware.RELEASENov,2017
    1.5.16.RELEASESep,2018Edgware.SR5Oct.2018
    1.5.20.RELEASEApr,2019Edgware.SR5Oct.2018
    2.0.2.RELEASEMay,2018Finchley.BUILD-SNAPSHOT2018年未知月
    2.0.6.RELEASEOct,2018Finchley.SR2Oct.2018
    2.1.4.RELEASEApr,2019Greanwich.SR1Mar.2019

    使用后两个

  3. 创建工程

    1. 创建父工程

      • 新建父工程项目springcloud,切记Packaging是pom模式

      • 主要是定义POM文件,将后续各个子模块公用的jar包等统一提取出来,类似一个抽象父类

        在这里插入图片描述

      • 父工程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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
            <modelVersion>4.0.0</modelVersion>
        
            <groupId>com.kuang</groupId>
            <artifactId>springcloud</artifactId>
            <version>1.0-SNAPSHOT</version>
            <modules>
                <module>springcloud-api</module>
                <module>springcloud-provider-dept-8001</module>
            </modules>
        
            <!--打包方式 pom-->
            <packaging>pom</packaging>
        
            <properties>
                <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
                <maven.compiler.source>1.8</maven.compiler.source>
                <maven.compiler.target>1.8</maven.compiler.target>
                <junit.version>4.12</junit.version>
                <log4j.version>1.2.17</log4j.version>
                <lombok.version>1.16.10</lombok.version>
            </properties>
        
            <dependencyManagement>
                <dependencies>
                    <!--springCloud的依赖-->
                    <dependency>
                        <groupId>org.springframework.cloud</groupId>
                        <artifactId>spring-cloud-dependencies</artifactId>
                        <version>Greenwich.SR1</version>
                        <type>pom</type>
                        <scope>import</scope>
                    </dependency>
                    <!--SpringBoot-->
                    <dependency>
                        <groupId>org.springframework.boot</groupId>
                        <artifactId>spring-boot-dependencies</artifactId>
                        <version>2.1.4.RELEASE</version>
                        <type>pom</type>
                        <scope>import</scope>
                    </dependency>
                    <!--数据库-->
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>5.1.47</version>
                    </dependency>
                    <dependency>
                        <groupId>com.alibaba</groupId>
                        <artifactId>druid</artifactId>
                        <version>1.1.10</version>
                    </dependency>
                    <!--SpringBoot 启动器-->
                    <dependency>
                        <groupId>org.mybatis.spring.boot</groupId>
                        <artifactId>mybatis-spring-boot-starter</artifactId>
                        <version>1.3.2</version>
                    </dependency>
                    <!--以下主要是用于日志和测试-->
                    <!--junit-->
                    <dependency>
                        <groupId>junit</groupId>
                        <artifactId>junit</artifactId>
                        <version>${junit.version}</version>
                    </dependency>
                    <!--lombok-->
                    <dependency>
                        <groupId>org.projectlombok</groupId>
                        <artifactId>lombok</artifactId>
                        <version>${lombok.version}</version>
                    </dependency>
                    <!--log4j-->
                    <dependency>
                        <groupId>log4j</groupId>
                        <artifactId>log4j</artifactId>
                        <version>${log4j.version}</version>
                    </dependency>
                    <!--logback-->
                    <dependency>
                        <groupId>ch.qos.logback</groupId>
                        <artifactId>logback-core</artifactId>
                        <version>1.2.3</version>
                    </dependency>
                </dependencies>
            </dependencyManagement>
        
        </project>
        
    2. 创建子模块 springcloud-api

      在这里插入图片描述

      • 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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
            <parent>
                <artifactId>springcloud</artifactId>
                <groupId>com.kuang</groupId>
                <version>1.0-SNAPSHOT</version>
            </parent>
            <modelVersion>4.0.0</modelVersion>
        
            <artifactId>springcloud-api</artifactId>
        
            <properties>
                <maven.compiler.source>8</maven.compiler.source>
                <maven.compiler.target>8</maven.compiler.target>
            </properties>
        
            <!--当前的Module自己需要的依赖,如果父依赖中已经设置了版本,这里就不用写了-->
            <dependencies>
                <dependency>
                    <groupId>org.projectlombok</groupId>
                    <artifactId>lombok</artifactId>
                </dependency>
            </dependencies>
        </project>
        
      • 数据库的创建

        在这里插入图片描述

      • 实体类的编写

        在这里插入图片描述

        package com.kuang.springcloud.pojo;
        
        import lombok.AllArgsConstructor;
        import lombok.Data;
        import lombok.NoArgsConstructor;
        import lombok.experimental.Accessors;
        
        import java.io.Serializable;
        
        /*
         * 所有的实体类必须要实现序列化
         */
        @Data
        @NoArgsConstructor
        @Accessors(chain = true) // 链式写法
        public class Dept implements Serializable { //Dept 实体类, orm   类表关系映射
        
            private Long deptno;//主键
            private String dname;
            // 这个数据是存在哪个数据库的字段~ 微服务架构:一个服务对应一个数据库,同一个信息可能存在不同的数据库
            private String db_source;
        
            public Dept(String dname) {
                this.dname = dname;
            }
        
            /*
             链式写法:
                Dept dept = new Dept();
        
                dept.setDeptNo(11).setDname('ssss').setDb_source('001');
             */
        }
        
    3. 子模块springcloud-provider-dept-8001服务的提供者的编写

      在这里插入图片描述

      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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
          <parent>
              <artifactId>springcloud</artifactId>
              <groupId>com.kuang</groupId>
              <version>1.0-SNAPSHOT</version>
          </parent>
          <modelVersion>4.0.0</modelVersion>
      
          <artifactId>springcloud-provider-dept-8001</artifactId>
      
          <dependencies>
              <!--我们需要拿到实体类,所以要配置api module-->
              <dependency>
                  <groupId>com.kuang</groupId>
                  <artifactId>springcloud-api</artifactId>
                  <version>1.0-SNAPSHOT</version>
              </dependency>
              <!--junit-->
              <dependency>
                  <groupId>junit</groupId>
                  <artifactId>junit</artifactId>
                  <scope>test</scope>
              </dependency>
              <dependency>
                  <groupId>mysql</groupId>
                  <artifactId>mysql-connector-java</artifactId>
              </dependency>
              <dependency>
                  <groupId>com.alibaba</groupId>
                  <artifactId>druid</artifactId>
              </dependency>
              <dependency>
                  <groupId>ch.qos.logback</groupId>
                  <artifactId>logback-core</artifactId>
              </dependency>
              <dependency>
                  <groupId>org.mybatis.spring.boot</groupId>
                  <artifactId>mybatis-spring-boot-starter</artifactId>
              </dependency>
              <!--test-->
              <dependency>
                  <groupId>org.springframework.boot</groupId>
                  <artifactId>spring-boot-test</artifactId>
              </dependency>
              <dependency>
                  <groupId>org.springframework.boot</groupId>
                  <artifactId>spring-boot-starter-web</artifactId>
              </dependency>
              <!--jetty-->
              <dependency>
                  <groupId>org.springframework.boot</groupId>
                  <artifactId>spring-boot-starter-jetty</artifactId>
              </dependency>
              <!--热部署工具-->
              <dependency>
                  <groupId>org.springframework.boot</groupId>
                  <artifactId>spring-boot-devtools</artifactId>
              </dependency>
          </dependencies>
      
      </project>
      

      application.yaml:

      server:
        port: 8001
      
      mybatis:
        type-aliases-package: com.kuang.springcloud.pojo
        config-location: classpath:mybatis/mybatis-config.xml
        mapper-locations: classpath:mybatis/mapper/*.xml
      
      spring:
        application:
          name: springcloud-provider-dept
        datasource:
          type: com.alibaba.druid.pool.DruidDataSource
          driver-class-name: com.mysql.jdbc.Driver
          url: jdbc:mysql://localhost:3306/db01?useUnicode=true&characterEncoding=utf-8
          username: root
          password: 15591177926
      

      mybatis-config.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>
              <!--开启二级缓存-->
              <setting name="cacheEnabled" value="true"/>
          </settings>
      </configuration>
      

      DeptMapper.xml:

      <?xml version="1.0" encoding="UTF-8" ?>
      <!DOCTYPE mapper
              PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
              "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
      <mapper namespace="com.kuang.springcloud.dao.DeptDao">
          
          <insert id="addDept" parameterType="dept">
              insert into dept (dname,db_source)
              values (#{dname},DATABASE());
          </insert>
          
          <select id="queryById" parameterType="long" resultType="dept">
              select *
              from depth where deptno = #{deptno};
          </select>
          
          <select id="queryAll" resultType="dept">
              select *
              from dept;
          </select>
      </mapper>
      

      接口DeptController的编写:

      // 提供Restful服务
      @RestController
      public class DeptController {
      
          @Autowired
          private DeptService deptService;
      
          @PostMapping("/dept/add")
          public boolean addDept(Dept dept) {
              return deptService.addDept(dept);
          }
      
          @GetMapping("/dept/get/{id}")
          public Dept get(@PathVariable("id") Long id) {
              return deptService.queryById(id);
          }
      
          @GetMapping("/dept/list")
          public List<Dept> queryAll() {
              return deptService.queryAll();
          }
      
      }
      

      整体的目录结构:

      在这里插入图片描述

    4. 子模块springcloud-consumer-dept-80的编写

      • pom依赖编写

        <?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
            <parent>
                <artifactId>springcloud</artifactId>
                <groupId>com.kuang</groupId>
                <version>1.0-SNAPSHOT</version>
            </parent>
            <modelVersion>4.0.0</modelVersion>
        
            <artifactId>springcloud-consumer-dept-80</artifactId>
        
            <dependencies>
                <dependency>
                    <groupId>com.kuang</groupId>
                    <artifactId>springcloud-api</artifactId>
                    <version>1.0-SNAPSHOT</version>
                </dependency>
        
                <dependency>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-web</artifactId>
                </dependency>
            </dependencies>
        
        </project>
        
      • application.yaml

        server:
          port: 80
        
      • **将RestTemplate注册到spring中:**ConfigBean.java

        @Configuration
        public class ConfigBean {   //Cofiguration -- spring applicationContext.xml
        
            @Bean
            public RestTemplate getRestTemplate() {
                return new RestTemplate();
            }
        
        }
        
      • DeptConsumerController.java

        @RestController
        public class DeptConsumerController {
            // 理解:消费者,不应该有service层
            // RestTemplate ... 供我们直接调用就可以了!注解到spring中
        
            // (url,实体:Map,Class<T> responseType)
            @Autowired
            private RestTemplate restTemplate;//提供多种便捷访问Http的方法
        
            private static final String REST_URL_PREFIX = "http://localhost:8001";
        
            @RequestMapping("/consumer/dept/add")
            public boolean add(Dept dept) {
                return restTemplate.postForObject(REST_URL_PREFIX+"/dept/add",dept,Boolean.class);
            }
        
            @RequestMapping("/consumer/dept/get/{id}")
            public Dept get(@PathVariable("id") Long id) {
                return restTemplate.getForObject(REST_URL_PREFIX+"/dept/get/"+id,Dept.class);
            }
        
            @RequestMapping("/consumer/dept/list")
            public List<Dept> list() {
                return restTemplate.getForObject(REST_URL_PREFIX+"/dept/list",List.class);
            }
        
        }
        
      • 启动服务:DeptConsumer_80

        @SpringBootApplication
        public class DeptConsumer_80 {
            public static void main(String[] args) {
                SpringApplication.run(DeptConsumer_80.class,args);
            }
        }
        
      • 整体目录结构

      在这里插入图片描述

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