springcloud系列1——使用Springboot对外提供rest服务

曾经终败给现在 2022-05-14 06:22 178阅读 0赞

## 说明 ##

本系列视频基于周立的视频整理，他的博客地址：[http://www.itmuch.com/][http_www.itmuch.com]。

由于springclound基于Springboot，因此第一篇熟悉一下Springboot。  
这里为了后面的演示，创建一个project，名为`microservice-spring-cloud`。  
创建2个子模块：  
\* microservice-springcloud-user  
该模块提供用户查询功能  
\* microservice-springcloud-movie  
该模块是电影模块，从microservice-springcloud-user模块查询用户信息。

## microservice-spring-cloud ##

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.tommy.springcloud</groupId>
        <artifactId>microserver-spring-cloud</artifactId>
        <packaging>pom</packaging>
        <version>1.0-SNAPSHOT</version>
        <modules>
            <module>microservice-springcloud-user</module>
            <module>microservice-springcloud-movie</module>
        </modules>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>1.5.9.RELEASE</version>
        </parent>
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <java.version>1.8</java.version>
        </properties>
        <repositories>
            <repository>
                <id>spring-milestones</id>
                <name>Spring Milestones</name>
                <url>https://repo.spring.io/libs-milestone</url>
                <snapshots>
                    <enabled>false</enabled>
                </snapshots>
            </repository>
        </repositories>
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    </project>

## microservice-springcloud-user模块 ##

该模块使用Springboot，数据库使用h2内存数据库，数据库框架使用jpa。

application.yml:

server:
      port: 7902
    
    spring:
      application:
        name: microservice-springcloud-user
      jpa:
        generate-ddl: false
        # 显示SQL
        show-sql: true
        format_sql: true
        hibernate:
          ddl-auto: none
      datasource:
        platform: h2
        # 指定DDL脚本
        schema: classpath:schema.sql
        # 指定数据初始化脚本
        data: classpath:data.sql
    
    
    loggin:
      level:
        root: INFO
        org.hibernate: INFO
        org.hibernate.type.descriptor.sql.BasicBinder: TRACE
        org.hibernate.type.descriptor.sql.BasicExtractor: TRACE
        com.tommy: DEBUG

schema.sql:

DROP TABLE USER IF EXISTS ;
    create table USER(id bigint generated BY DEFAULT AS IDENTITY ,username VARCHAR(32),NAME VARCHAR (20),balance DECIMAL(10,2),PRIMARY KEY (id));

data.sql:

INSERT INTO USER(ID,username,NAME ,balance) VALUES (1,'user1','张三',100.00);
    INSERT INTO USER(ID,username,NAME ,balance) VALUES (2,'user2','李四',100.00);
    INSERT INTO USER(ID,username,NAME ,balance) VALUES (3,'user3','王五',100.00);
    INSERT INTO USER(ID,username,NAME ,balance) VALUES (4,'user4','马六',100.00);

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.tommy.cloud</groupId>
        <artifactId>microservice-sample-provider</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
        <name>microservice-sample-provider</name>
        <description>Demo project for Spring Boot</description>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>1.5.9.RELEASE</version>
            <relativePath/> 
        </parent>
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <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>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
        </dependencies>
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    </project>

用户实体类：

package com.tommy.springcloud.entity;
    
    import javax.persistence.*;
    import java.math.BigDecimal;
    
    /** * @author j.tommy * @version 1.0 * @date 2018/1/24 */
    @Entity
    public class User { 
        @Id
        @GeneratedValue(strategy = GenerationType.AUTO)
        private Long id;
        @Column
        private String username;
        @Column
        private String name;
        @Column
        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 BigDecimal getBalance() {
            return balance;
        }
        public void setBalance(BigDecimal balance) {
            this.balance = balance;
        }
    }

数据库操作类：

package com.tommy.springcloud.repository;
    
    import com.tommy.springcloud.entity.User;
    import org.springframework.data.jpa.repository.JpaRepository;
    import org.springframework.stereotype.Repository;
    
    /** * @author j.tommy * @version 1.0 * @date 2018/1/24 */
    @Repository
    public interface UserRepository extends JpaRepository<User,Long> { 
    }

对外提供服务的Controller：

package com.tommy.springcloud.controller;
    import com.tommy.springcloud.entity.User;
    import com.tommy.springcloud.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 j.tommy * @version 1.0 * @date 2018/1/24 */
    @RestController
    public class UserController { 
        @Autowired
        private UserRepository userRepository;
        @GetMapping("/sample/{id}")
        public User findById(@PathVariable Long id) {
            return this.userRepository.findOne(id);
        }
    }

应用启动类：

package com.tommy.springcloud;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
    /** * @author Administrator */
    @SpringBootApplication
    public class MicroserviceUserProviderApplication { 
        public static void main(String[] args) {
            SpringApplication.run(MicroserviceUserProviderApplication.class, args);
        }
    }

启动后，通过[http://localhost:7902/sample/1][http_localhost_7902_sample_1]，即可查询用户id为1的用户信息。

## microservice-springcloud-movie模块 ##

电影模块，从microservice-springcloud-user模块查询用户信息。

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.tommy.cloud</groupId>
        <artifactId>microservice-springcloud-movie</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
        <name>microservice-springcloud-movie</name>
        <description>Demo project for Spring Boot</description>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>1.5.9.RELEASE</version>
            <relativePath/> 
        </parent>
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <java.version>1.8</java.version>
        </properties>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
        </dependencies>
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    </project>

application.yml:

server:
      port: 7901

用户实体类：

package com.tommy.cloud.microservicemovie.entity;
    import java.math.BigDecimal;
    /** * @author j.tommy * @version 1.0 * @date 2018/1/24 */
    public class User { 
        private Long id;
        private String username;
        private String name;
        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 BigDecimal getBalance() {
            return balance;
        }
        public void setBalance(BigDecimal balance) {
            this.balance = balance;
        }
    }

MovieController

package com.tommy.cloud.microservicemovie.controller;
    import com.tommy.cloud.microservicemovie.entity.User;
    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;
    import org.springframework.web.client.RestTemplate;
    /** * @author j.tommy * @version 1.0 * @date 2018/1/24 */
    @RestController
    public class MovieController { 
        @Autowired
        private RestTemplate restTemplate;
        @GetMapping("/movie/{id}")
        public User findUserById(@PathVariable Long id) {
            return this.restTemplate.getForObject("http://localhost:7902/sample/" + id, User.class);
        }
    }

应用启动类：

package com.tommy.cloud.microservicemovie;
    import org.springframework.beans.factory.annotation.Autowired;
    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 MicroserviceSampleConsumerApplication { 
        @Bean
        public RestTemplate restTemplate() {
            return new RestTemplate();
        }
        public static void main(String[] args) {
            SpringApplication.run(MicroserviceSampleConsumerApplication.class, args);
        }
    }

启动后，通过[http://localhost:7901/movie/1][http_localhost_7901_movie_1]，即可查询用户id为1的用户信息。  
至此，使用Springboot搭建的一个服务提供者和服务消费者模块就完成了。

[http_www.itmuch.com]: http://www.itmuch.com/
[http_localhost_7902_sample_1]: http://localhost:7902/sample/1
[http_localhost_7901_movie_1]: http://localhost:7901/movie/1