从零开始学spring cloud(四) -------- 基础项目搭建

1.创建一个spring cloud项目

1.1.使用工具创建--idea

点击creat new project,选择spring initializr

点击next，选择下一步

填入自己的GroupId和ArtifactId，

选择路径后，点击完成，

由于需要开发的模块比较多，这边将建立多模块的项目。

搭建完成后的项目结构如下图所示：

其中，一个用户模块，一个电影模块，电影模式是做为消费者的角色存在，用户模块提供用户信息

现在，直接使用硬编码，让movie模块，调用user模块接口，

先看一下user服务提供者代码：

父pom文件(所有子模块的父模块的pom)：

 <?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>
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
         <version>2.1.3.RELEASE</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
     <groupId>com.zwjk.cloud</groupId>
     <artifactId>microservice-spring-cloud</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <name>microservice-spring-cloud</name>
     <description>Demo project for Spring Boot</description>

     <modules>
         <module>microservice-provider-user</module>
         <module>microservice-doscovey-eureka</module>
         <module>microservice-consumer-movie</module>
     </modules>

     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <java.version>1.8</java.version>
         <spring.cloud.version>Greenwich.SR1</spring.cloud.version>
     </properties>

     <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>

user模块pom文件：

 <?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>
     <parent>
         <groupId>com.zwjk.cloud</groupId>
         <artifactId>microservice-spring-cloud</artifactId>
         <version>0.0.1-SNAPSHOT</version>
     </parent>

     <artifactId>microservice-provider-user</artifactId>
     <packaging>jar</packaging>

     <name>microservice-provider-user</name>
     <description>Demo project for Spring Boot</description>

     <properties>
         <java.version>1.8</java.version>
     </properties>

     <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-data-jpa</artifactId>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
         <dependency>
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
             <scope>runtime</scope>
         </dependency>
     </dependencies>

 </project>

user模块配置文件yml：

server:
  port: 7900
spring:
  jpa:
    generate-ddl: false
    show-sql: false
    hibernate:
      ddl-auto: none
  datasource:
    platform: h2
    schema: classpath:schema.sql
    data: classpath:data.sql
  application:
    name: microservice-provider-user
logging:
  level:
    root: info
    org.hibernate: INFO
    org.hibernate.type.descriptor.sql.BasicBinder: TRACE
    org.hibernate.type.descriptor.sql.BasicExtractor: TRACE
    com.zwjk: DEBUG

data.sql（放在yml同一级):

insert into user(id,username, name, age, balance) values(1,'user1', '张三', 20, 100.00);
insert into user(id,username, name, age, balance) values(2,'user2', '李四', 20, 100.00);
insert into user(id,username, name, age, balance) values(3,'user3', '王五', 20, 100.00);
insert into user(id,username, name, age, balance) values(4,'user4', '马六', 20, 100.00);

schema.sql（放在yml同一级):

drop table user if exists;
create table user(
    id bigint generated by default as identity,
    username varchar(40),
    name varchar(20),
    age int(3),
    balance decimal(10,2),
    primary key(id)
);

User：

 package com.zwjk.cloud.entity;

 import javax.persistence.*;
 import java.math.BigDecimal;

 /**
  * @author : Jixiaohu
  * @Date : 2019-04-11.
  * @Time : 9:07.
  * @Description :
  */
 @Entity
 public class User {

     public User(Long id, String username) {
         super();
         this.id = id;
         this.username = username;
     }

     public User() {
         super();
     }

     @Id
     @GeneratedValue(strategy = GenerationType.AUTO)
     private Long id;

     @Column
     private String username;

     @Column
     private String name;

     @Column
     private Short age;

     @Column
     private BigDecimal balance;

     public Long getId() {
         return this.id;
     }

     public void setId(Long id) {
         this.id = id;
     }

     public String getUsername() {
         return this.username;
     }

     public void setUsername(String username) {
         this.username = username;
     }

     public String getName() {
         return this.name;
     }

     public void setName(String name) {
         this.name = name;
     }

     public Short getAge() {
         return this.age;
     }

     public void setAge(Short age) {
         this.age = age;
     }

     public BigDecimal getBalance() {
         return this.balance;
     }

     public void setBalance(BigDecimal balance) {
         this.balance = balance;
     }
 }

UserRepository：

package com.zwjk.cloud.repository;

import com.zwjk.cloud.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface UserRepository extends JpaRepository<User, Long> {
    User getUserById(Long id);
}

Controller：

package com.zwjk.cloud.controller;

import com.zwjk.cloud.entity.User;
import com.zwjk.cloud.repository.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author : Jixiaohu
 * @Date : 2019-04-11.
 * @Time : 9:08.
 * @Description :
 */
@RestController
public class UserController {

    @Autowired
    private UserRepository userRepository;

    @GetMapping("/simple/{id}")
    public User findById(@PathVariable Long id) {
        return this.userRepository.getUserById(id);
    }
}

启动类：

package com.zwjk.cloud;

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

@SpringBootApplication
public class MicroserviceProviderUserApplication {

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

启动项目后，通过浏览器访问http://localhost:7900/simple/1可以得到相应的user

{"id":1,"username":"user1","name":"张三","age":20,"balance":100.00}

到这里，一个用户消息提供者已经开发完成。

下面搭建电影消费者模块：

movie模块pom文件：

 <?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>

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

     <artifactId>microservice-consumer-movie</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <name>microservice-consumer-movie</name>
     <description>Demo project for Spring Boot</description>

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

 </project>

yml配置文件：

 spring:
   application:
     name: microservice-consumer-movie
 server:
   port: 7901
 user:
   userServicePath: http://localhost:7900/simple/

User实体类：

 package com.zwjk.cloud.entity;

 import java.math.BigDecimal;

 /**
  * @author : Jixiaohu
  * @Date : 2019-04-11.
  * @Time : 9:39.
  * @Description :
  */
 public class User {
     private Long id;

     private String username;

     private String name;

     private Short age;

     private BigDecimal balance;

     public Long getId() {
         return id;
     }

     public void setId(Long id) {
         this.id = id;
     }

     public String getUsername() {
         return username;
     }

     public void setUsername(String username) {
         this.username = username;
     }

     public String getName() {
         return name;
     }

     public void setName(String name) {
         this.name = name;
     }

     public Short getAge() {
         return age;
     }

     public void setAge(Short age) {
         this.age = age;
     }

     public BigDecimal getBalance() {
         return balance;
     }

     public void setBalance(BigDecimal balance) {
         this.balance = balance;
     }
 }

MovieController：

package com.zwjk.cloud.controller;

import com.zwjk.cloud.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

/**
 * @author : Jixiaohu
 * @Date : 2019-04-11.
 * @Time : 9:38.
 * @Description :
 */
@RestController
public class MovieController {

    @Autowired
    private RestTemplate restTemplate;

    @Value("${user.userServicePath}")
    private String userServicePath;

    @GetMapping("/movie/{id}")
    public User findById(@PathVariable Long id) {
        return this.restTemplate.getForObject(this.userServicePath + id, User.class);
    }
}

MicroserviceConsumerMovieApplication：

 package com.zwjk.cloud;

 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.Bean;
 import org.springframework.web.client.RestTemplate;

 @SpringBootApplication
 public class MicroserviceConsumerMovieApplication {

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

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

 }

启动项目后，可以通过访问浏览器的

http://localhost:7901/movie/2

可以获得user消息提供用户信息

{"id":2,"username":"user2","name":"李四","age":20,"balance":100.00}

这里，实现了服务之间的调用