项目结构:
首先创建一个Maven父工程:springcloud-example,相关的pom.xml如下:
<?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.cn</groupId> <artifactId>springcloud-example</artifactId> <version>1.0-SNAPSHOT</version> <packaging>pom</packaging> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.3.RELEASE</version> <relativePath/> </parent> <modules> <module>user-service</module> <module>consumer-demo</module> <module>eureka-server</module> <module>zuul-demo</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>Finchley.SR2</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> <dependency> <groupId>tk.mybatis</groupId> <artifactId>mapper-spring-boot-starter</artifactId> <version>2.0.4</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.32</version> </dependency> </dependencies> </dependencyManagement> <dependencies> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
接着创建服务提供方:user-service,pom.xml如下:
<?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-example</artifactId> <groupId>com.cn</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>user-service</artifactId> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <dependency> <groupId>tk.mybatis</groupId> <artifactId>mapper-spring-boot-starter</artifactId> </dependency> <!-- 除了eureka服务方,其他引入的都是客户端client--> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> </dependencies> </project>
对应的启动方法UserApplication
package com.cn; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.client.discovery.EnableDiscoveryClient; /** * Created by 13632 on 2018-12-11. */ @SpringBootApplication @tk.mybatis.spring.annotation.MapperScan("com.cn.mapper") //启动Eureka注册中心 @EnableDiscoveryClient public class UserApplication { public static void main(String[] args) { SpringApplication.run(UserApplication.class, args); } }
pojo类
package com.cn.pojo; import lombok.Data; import tk.mybatis.mapper.annotation.KeySql; import javax.persistence.Id; import javax.persistence.Table; import java.util.Date; /** * Created by 13632 on 2018-12-11. */ //因为引入了lombok插件,所有只要使用@Data注解就能自动实现get、set、toString等方法 @Data //连接数据库的user表 @Table(name = "user") public class User { //主键自增 @Id @KeySql(useGeneratedKeys = true) private Integer id; private String username; private String password; private Date birth; private String gender; private String email; private Integer status; private Date regtime; }
mapper类
package com.cn.mapper; import com.cn.pojo.User; import tk.mybatis.mapper.common.Mapper; /** * Created by 13632 on 2018-12-11. */ //继承tk.mybatis的Mapper类就可以不用在写相关的mapper方法 public interface UserMapper extends Mapper<User> { }
service
package com.cn.service; import com.cn.mapper.UserMapper; import com.cn.pojo.User; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; /** * Created by 13632 on 2018-12-11. */ @Service public class UserService { @Autowired private UserMapper userMapper; public User queryById(Integer id) { return userMapper.selectByPrimaryKey(id); } }
web
package com.cn.web; import com.cn.pojo.User; import com.cn.service.UserService; 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.RequestMapping; import org.springframework.web.bind.annotation.RestController; /** * Created by 13632 on 2018-12-11. */ @RestController @RequestMapping("/user") public class UserController { @Autowired private UserService userService; @GetMapping("/{id}") public User queryById(@PathVariable("id") Integer id) { //这个代码测试用,让它休眠2秒,实现服务熔断,可以删掉 // try { // Thread.sleep(2000L); // } catch (InterruptedException e) { // e.printStackTrace(); // } return userService.queryById(id); } }