（1）SpringCloud怎么用

SpringCloud怎么用

0、建一个总的项目springcloud

需要导入的依赖：SpringCloud

<!--SpringCloud的依赖-->
<!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-dependencies -->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-dependencies</artifactId>
    <version>Greenwich.SR1</version>
    <type>pom</type>
    <scope>import</scope>
</dependency>
<!--SpringBoot-->
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-dependencies -->
<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

<!--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>

日志和测试

<!--日志和测试：junit-->
<!-- https://mvnrepository.com/artifact/junit/junit -->
<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>${junit.version}</version>
</dependency>
<!--lombok-->
<!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>${lombok.version}</version>
</dependency>
<!--log4j-->
<!-- https://mvnrepository.com/artifact/log4j/log4j -->
<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>${log4j.version}</version>
</dependency>
<!--logback-core-->
<!-- https://mvnrepository.com/artifact/ch.qos.logback/logback-core -->
<dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-core</artifactId>
    <version>${logback-core.version}</version>
</dependency>

1、第一个模块springcloud-api

需要的依赖

<!--父依赖有版本号-->
<dependencies>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
    </dependency>
</dependencies>

写一个和数据库中表对应的实体类Dept

2、第二个模块服务提供者springcloud-provider-dept-8001

需要的依赖

<!--服务提供者，需要连接数据库-->
<artifactId>springcloud-provider-dept-8001</artifactId>
​
<dependencies>
    <!--需要实体类，配置api module-->
    <dependency>
        <groupId>org.lele</groupId>
        <artifactId>springcloud-api</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
    </dependency>
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
    </dependency>
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-core</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 类似于Tomcat的功能-->
    <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>

添加配置文件application.yml

server:
  port: 8001
​
#mybatis配置
mybatis:
  type-aliases-package: org.lele.springcloud.pojo #别名
  config-location: classpath:mybatis/mybatis-config.xml
  mapper-locations: classpath:mybatis/mapper/*.xml
​
#spring配置
spring:
  application:
    name: springcloud-provider-dept-8001
  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: 123456

添加配置文件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>

写Dao层，Service层，Controller层，最后写一个启动类。

略

3、第四个模块服务消费者springcloud-consumer-80

需要的依赖

<!--    实体类和web-->
    <dependencies>
        <dependency>
            <groupId>org.lele</groupId>
            <artifactId>springcloud-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--热部署工具-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
    </dependencies>

添加配置文件application.yml

server:
  port: 80

编写消费者远程调用提供者

/**
 * 理解：消费者，不应该有service层
 * RestTemplate......供我们直接调用其他模块的！需要注册到spring中
 * 方法参数比较重要的（URL,实体参数 map，返回的类型 responseType）
 */
@RestController
public class DeptConsumerController {
   
    @Autowired
    private RestTemplate restTemplate;//提供多种便捷访问远程http服务的方法，简单的Restful服务模板
    
    private static final String REST_URL_PREFIX = "http://localhost:8001";
    @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/add")
    public boolean add(Dept dept){
        return restTemplate.postForObject(REST_URL_PREFIX+"/dept/add",dept,Boolean.class);
    }
    @RequestMapping("/consumer/dept/list")
    public List<Dept> list(){
        return restTemplate.getForObject(REST_URL_PREFIX+"/dept/list", List.class);
    }
}

RestTempalte没有bean，需要编写一个bean

@Configuration //springBoot的注解 ，相当于spring中 applicationContext.xml
public class ConfigBean {
    @Bean
    public RestTemplate getRestTemplate(){
        return new RestTemplate();
    }
}

编写启动类，启动测试

略