SpringCloud工程入门

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>

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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>

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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);
    }
}

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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;
}

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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> {
}

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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);
    }
}

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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);
    }
}

SpringCloud工程入门

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