springcloud micro service implementation CRUD

With the advent of micro-services, we have developed more efficient than before but also a lot faster than traditional development model, more convenient micro services provided, so that our developers speed has been greatly improved, and I compared before writing combined springcloud binding mybati implement CRUD. This time, write a comment pure way to achieve a simple CRUD.

Create a parent project, you can not create my major was written and there are other functions, it is not just a simple CRUD, so they need a parent to manage the project

pom.xml father works as follows:

<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.tensquare</groupId>
  <artifactId>tensquare_parent</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>pom</packaging>
   <name>springCloud</name>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.1.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>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.M9</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <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>

    <repositories>
        <repository>
            <id>spring-snapshots</id>
            <name>SpringSnapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>spring-milestones</id>
            <name>SpringMilestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>spring-snapshots</id>
            <name>SpringSnapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </pluginRepository>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>SpringMilestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>
    <modules>
    	<module>springCloud_base</module>
    </modules>
</project>

The parent works in the following to create a web project. pom.xml as follows:

<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.tensquare</groupId>
		<artifactId>springCloud</artifactId>
		<version>0.0.1-SNAPSHOT</version>
	</parent>
	<artifactId>springCloud_base</artifactId>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>
	</dependencies>
</project>

Built table script:

DROP DATABASE IF EXISTS "user" ;
CREATE TABLE `user` (
  `id` INT(11) DEFAULT NULL,
  `name` VARCHAR(255) DEFAULT NULL,
  `age` INT(11) DEFAULT NULL
) ENGINE=INNODB DEFAULT CHARSET=utf8;
INSERT INTO `user` VALUES ('1', '张三', '22'), ('2', '李四', '23')，('3', '王五', '22'), ('4', '赵六', '23');
 

User objects

package com.csq.study;
 

@Entity
@Table(name="user")
public class User {
 
	
	@Id
	int id;
	String name;
	int age;
	
	
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	@Override
	public String toString() {
		return "User [id=" + id + ", name=" + name + ", age=" + age + "]";
	}
	
 
}
 

Result returns the result object

public class Result {
	private boolean flag;//是否成功
	private Integer code;// 返回码
	private String message;//返回信息
	private Object data;// 返回数据
set/get ... 构造方法  略 
}

 

StatusCode Status Response

public class StatusCode {
	public static final int OK=20000;//成功
	public static final int ERROR =20001;//失败
	public static final int LOGINERROR =20002;//用户名或密码错误
	public static final int ACCESSERROR =20003;//权限不足
	public static final int REMOTEERROR =20004;//远程调用失败
	public static final int REPERROR =20005;//重复操作
}

utils id generator in tools:

 

package util;

import java.lang.management.ManagementFactory;
import java.net.InetAddress;
import java.net.NetworkInterface;

/**
 * <p>名称：IdWorker.java</p>
 * <p>描述：分布式自增长ID</p>
 * <pre>
 *     Twitter的 Snowflake　JAVA实现方案
 * </pre>
 * 核心代码为其IdWorker这个类实现，其原理结构如下，我分别用一个0表示一位，用—分割开部分的作用：
 * 1||0---0000000000 0000000000 0000000000 0000000000 0 --- 00000 ---00000 ---000000000000
 * 在上面的字符串中，第一位为未使用（实际上也可作为long的符号位），接下来的41位为毫秒级时间，
 * 然后5位datacenter标识位，5位机器ID（并不算标识符，实际是为线程标识），
 * 然后12位该毫秒内的当前毫秒内的计数，加起来刚好64位，为一个Long型。
 * 这样的好处是，整体上按照时间自增排序，并且整个分布式系统内不会产生ID碰撞（由datacenter和机器ID作区分），
 * 并且效率较高，经测试，snowflake每秒能够产生26万ID左右，完全满足需要。
 * <p>
 * 64位ID (42(毫秒)+5(机器ID)+5(业务编码)+12(重复累加))
 *
 * @author Polim
 */
public class IdWorker {
    // 时间起始标记点，作为基准，一般取系统的最近时间（一旦确定不能变动）
    private final static long twepoch = 1288834974657L;
    // 机器标识位数
    private final static long workerIdBits = 5L;
    // 数据中心标识位数
    private final static long datacenterIdBits = 5L;
    // 机器ID最大值
    private final static long maxWorkerId = -1L ^ (-1L << workerIdBits);
    // 数据中心ID最大值
    private final static long maxDatacenterId = -1L ^ (-1L << datacenterIdBits);
    // 毫秒内自增位
    private final static long sequenceBits = 12L;
    // 机器ID偏左移12位
    private final static long workerIdShift = sequenceBits;
    // 数据中心ID左移17位
    private final static long datacenterIdShift = sequenceBits + workerIdBits;
    // 时间毫秒左移22位
    private final static long timestampLeftShift = sequenceBits + workerIdBits + datacenterIdBits;

    private final static long sequenceMask = -1L ^ (-1L << sequenceBits);
    /* 上次生产id时间戳 */
    private static long lastTimestamp = -1L;
    // 0，并发控制
    private long sequence = 0L;

    private final long workerId;
    // 数据标识id部分
    private final long datacenterId;

    public IdWorker(){
        this.datacenterId = getDatacenterId(maxDatacenterId);
        this.workerId = getMaxWorkerId(datacenterId, maxWorkerId);
    }
    /**
     * @param workerId
     *            工作机器ID
     * @param datacenterId
     *            序列号
     */
    public IdWorker(long workerId, long datacenterId) {
        if (workerId > maxWorkerId || workerId < 0) {
            throw new IllegalArgumentException(String.format("worker Id can't be greater than %d or less than 0", maxWorkerId));
        }
        if (datacenterId > maxDatacenterId || datacenterId < 0) {
            throw new IllegalArgumentException(String.format("datacenter Id can't be greater than %d or less than 0", maxDatacenterId));
        }
        this.workerId = workerId;
        this.datacenterId = datacenterId;
    }
    /**
     * 获取下一个ID
     *
     * @return
     */
    public synchronized long nextId() {
        long timestamp = timeGen();
        if (timestamp < lastTimestamp) {
            throw new RuntimeException(String.format("Clock moved backwards.  Refusing to generate id for %d milliseconds", lastTimestamp - timestamp));
        }

        if (lastTimestamp == timestamp) {
            // 当前毫秒内，则+1
            sequence = (sequence + 1) & sequenceMask;
            if (sequence == 0) {
                // 当前毫秒内计数满了，则等待下一秒
                timestamp = tilNextMillis(lastTimestamp);
            }
        } else {
            sequence = 0L;
        }
        lastTimestamp = timestamp;
        // ID偏移组合生成最终的ID，并返回ID
        long nextId = ((timestamp - twepoch) << timestampLeftShift)
                | (datacenterId << datacenterIdShift)
                | (workerId << workerIdShift) | sequence;

        return nextId;
    }

    private long tilNextMillis(final long lastTimestamp) {
        long timestamp = this.timeGen();
        while (timestamp <= lastTimestamp) {
            timestamp = this.timeGen();
        }
        return timestamp;
    }

    private long timeGen() {
        return System.currentTimeMillis();
    }

    /**
     * <p>
     * 获取 maxWorkerId
     * </p>
     */
    protected static long getMaxWorkerId(long datacenterId, long maxWorkerId) {
        StringBuffer mpid = new StringBuffer();
        mpid.append(datacenterId);
        String name = ManagementFactory.getRuntimeMXBean().getName();
        if (!name.isEmpty()) {
         /*
          * GET jvmPid
          */
            mpid.append(name.split("@")[0]);
        }
      /*
       * MAC + PID 的 hashcode 获取16个低位
       */
        return (mpid.toString().hashCode() & 0xffff) % (maxWorkerId + 1);
    }

    /**
     * <p>
     * 数据标识id部分
     * </p>
     */
    protected static long getDatacenterId(long maxDatacenterId) {
        long id = 0L;
        try {
            InetAddress ip = InetAddress.getLocalHost();
            NetworkInterface network = NetworkInterface.getByInetAddress(ip);
            if (network == null) {
                id = 1L;
            } else {
                byte[] mac = network.getHardwareAddress();
                id = ((0x000000FF & (long) mac[mac.length - 1])
                        | (0x0000FF00 & (((long) mac[mac.length - 2]) << 8))) >> 6;
                id = id % (maxDatacenterId + 1);
            }
        } catch (Exception e) {
            System.out.println(" getDatacenterId: " + e.getMessage());
        }
        return id;
    }


}

 Dao

dao
/**
 * JpaRepository提供了基本的增删改查
   JpaSpecificationExecutor用于做复杂的条件查询
 * @author HUNI
 */
public interface UserDao extends JpaRepository<User, String>,
    JpaSpecificationExecutor<User>{
}

service layer

@Service
public class UserService {
	@Autowired
	 UserDao userDao;
	@Autowired
	IdWorker idWorker;
	/**
	* 查询全部
	* @return
	*/
	public List<User> findAll(){	
	  return userDao.findAll();
	}
  /**
    * 根据Id查询
    * @param id
    * @return
    */
	public User findById(String id){	
		return userDao.findById(id).get();
	}
	/**
	 * 增加标签
	 * @param user
	 */
	public void add(User user){
		user.setId(idWorker.nextId()+"");
		userDao.save(user);
	}
	/**
	 * 更新标签
	 * @param user
	 */
	public void update(User user){
		
		userDao.save(user);
	}
	/**
	 * 删除标签
	 * @param id
	 */
	public void deteleById(String id){	
		userDao.deleteById(id);		
	}
}

controller

@RestController
@RequestMapping("/user")
public class UserController {
	@Autowired
	private UserService userService;
	@RequestMapping(method=RequestMethod.GET)
	public Result findAll(){
		Result result = new Result(true,StatusCode.OK,"查询成功",userService.findAll());
		return result;
	}
	@RequestMapping(value="/{id}", method=RequestMethod.GET)
	public Result findById(@PathVariable String id){
		Result result = new Result(true,StatusCode.OK,"查询成功",userService.findById(id));
		return result;
	}
	@RequestMapping(method=RequestMethod.POST)
	public Result add(@RequestBody User user){
		userService.add(user);
		 Result result = new Result(true,StatusCode.OK,"添加成功");
		 return result;
	}
	@RequestMapping(value="/{id}",method=RequestMethod.PUT)
	public Result update(@RequestBody  User user,@PathVariable String id){
		user.setId(id);
		userService.update(user);
		 Result result = new Result(true,StatusCode.OK,"修改成功");
		 return result;
	}
	@RequestMapping(value="/{id}", method=RequestMethod.DELETE)
	public Result deleteById(@PathVariable String id){
		userService.deteleById(id);
		Result result = new Result(true,StatusCode.OK,"删除成功");
		 return result;
	}
}

Quick Start class

 

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

	@Bean
	public IdWorker idworker(){
	  return new IdWorker(1,1);
	
	}
}

Profile application.yml

 

server:
 port: 9001  #服务端口
spring:
 application:
   name: springCloud-base   #服务名称
 datasource:
   driverClassName: com.mysql.jdbc.Driver
   url: jdbc:mysql://localhost:3306/user  #连接额数据库 
   username: root   #数据库用户
   password: root  #数据库密码
 jpa:
   database: mysql 
   show‐sql: true
   generate‐ddl: true

Use postman test results to see whether the correct 

Not posted here for the test results, we own test to see whether you write can run through.