一微服务架构概述

1.1 微服务特性以及优点

• 每个服务可以独立运行在自己的进程里
• 一系列独立运行的微服务(goods,order,pay,user,search…)共同构建了整个系统
• 每个服务为独立的业务开发，一个微服务只关注某个特定的功能，例如用户管理，商品管理微服务
• 微服务之间通过一些轻量级的通信机制进行通讯，例如通过Restful API进行调用
• 技术栈不受限:可以使用不同的开发语言和数据存储技术
• 全自动的部署机制
• 按需伸缩:根据需求和应用场景，实现细粒度的水平扩展

1.2 微服务带来的挑战

• 运维要求较高
• 分布式的复杂性
• 接口调整成本较高

1.3 微服务设计原则

• 单一职责原则
• 服务自治原则
• 轻量级通讯机制
• 微服务粒度

1.4 微服务开发框架

• SpringCloud:众多组件构造完善的分布式系统
• Dubbo/Dubbox:关注服务治理
• Dropwizard:关注单个微服务开发

二 SpringCloud概述与开发环境

2.1 SpringCloud概述

SpringCloud是基于SpringBoot之上的用来快速构建微服务系统的工具集，拥有功能完善的轻量级微服务组件，例如服务治理(Eureka),声明式REST调用(Feign),客户端负载均衡(Ribbon),服务容错(Hystrix),服务网关(Zuul)以及服务配置(Spring Cloud Config),服务跟踪(Sleuth)等等。

官网链接:http://projects.spring.io/spring-cloud/
目前主流的版本为SpringBoot1.4.5.RELEAE和SpringCloudCamden.SR7,
Maven pom配置如下：

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.5.RELEASE</version>
</parent>
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Camden.SR7</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>
<dependencies>
    <dependency>
        <groupId></groupId>
        <artifactId>spring-cloud-starter-config</artifactId>
    </dependency>
    <dependency>
        <groupId></groupId>
        <artifactId>spring-cloud-starter-eureka</artifactId>
    </dependency>
</dependencies>

2.2 开发环境

MacOS10.12+JDK8u131+IntelliJ IDEA2017.1.4

Tomcat8.5+Maven3.3.9+Git2.12+Firefox54

Spring4.3.9.RELEASE+SpringBoot1.4.5.RELEASE+SpringCloud Camden.SR7

三 工程机器模块说明

3.1 工程说明

工程首先自定义了Maven父工程,其中定义如下的公共组件:

<?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>

    <!-- 自定义工程的maven坐标-->
    <groupId>com.ekeyfund.springcloud</groupId>
    <artifactId>springcloud-parent</artifactId>
   <version>2.0.0-SNAPSHOT</version>
    <packaging>pom</packaging>

    <!-- 基于SpringBoot 1.4.5.RELEASE-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.5.RELEASE</version>
        <relativePath/>
    </parent>


    <!-- 定义引用类库版本 -->
    <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>Camden.SR7</spring-cloud.version>
        <springcloud-parent.version>2.0.0-SNAPSHOT</springcloud-parent.version>

        <druid.version>1.0.31</druid.version>
        <jackson.version>2.8.8</jackson.version>
        <commons-lang3.version>3.5</commons-lang3.version>
        <ehcache.version>3.1.4</ehcache.version>
        <hibernate.version>5.0.12.Final</hibernate.version>
        <servlet-api.version>3.1.0</servlet-api.version>
        <commons-collection4.version>4.1</commons-collection4.version>

        <springframework.oxm.version>4.3.9.RELEASE</springframework.oxm.version>
    </properties>


    <!-- 引入SpringCloud微服务常用组件-->
    <modules>
        <module>springcloud-eureka-server</module>
        <module>springcloud-eureka-server-ha</module>
        <module>springcloud-provider-user-service</module>
        <module>springcloud-consumer-h5-ribbon-hystrix</module>
        <module>springcloud-consumer-h5-feign</module>
        <module>springcloud-api-gateway</module>
        <module>springcloud-consumer-h5</module>
        <module>springcloud-config-server</module>
    </modules>



    <dependencies>

        <!-- 服务发现组件-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
        </dependency>

        <!-- 应用监控-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <!-- 应用测试-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>


        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>${druid.version}</version>
        </dependency>


        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>${servlet-api.version}</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>${jackson.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>${commons-lang3.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-collections4</artifactId>
            <version>${commons-collection4.version}</version>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-ehcache</artifactId>
            <version>${hibernate.version}</version>
        </dependency>

        <dependency>
            <groupId>org.ehcache</groupId>
            <artifactId>ehcache</artifactId>
            <version>${ehcache.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-oxm</artifactId>
            <version>${springframework.oxm.version}</version>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
</project>

3.2 模块说明

模块则借助IntelliJ IDEA结合Spring Initializer自动生成工程结构,主要模块和说明如下:

四 使用SpringBoot实现服务提供者

所属maven模块:springcloud-provider-user-service
基于SpringBoot的Web和JPA模块实现Restful API的常用方法

4.1 entity

主要包含User,Role,Department三个实体

Role.java

package com.ekeyfund.springcloud.entity;

import javax.persistence.*;
import java.io.Serializable;

/**
 * Role Entity
 *
 * @author Liuguanglei liuguanglei@ekeyfund.com
 * @create 2017-06-下午2:36
 */
@Entity
@Table(name = "springboot_role")
public class Role  implements Serializable{


    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "role_id")
    private Long id;

    @Column(name = "role_name")
    private String name;


    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return new org.apache.commons.lang3.builder.ToStringBuilder(this)
                .append("id", id)
                .append("name", name)
                .toString();
    }
}

Department.java

package com.ekeyfund.springcloud.entity;

import org.apache.commons.lang3.builder.ToStringBuilder;
import org.hibernate.annotations.CacheConcurrencyStrategy;

import javax.persistence.*;
import java.io.Serializable;

/**
 * Department Entity
 *
 * @author Liuguanglei liuguanglei@ekeyfund.com
 * @create 2017-06-下午2:31
 */
@Entity
@Table(name = "springboot_department")
@org.hibernate.annotations.Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class Department implements Serializable {


    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "department_id")
    private Long id;


    @Column(name = "department_name")
    private String name;


    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return new ToStringBuilder(this)
                .append("id", id)
                .append("name", name)
                .toString();
    }
}

User.java

package com.ekeyfund.springcloud.entity;

import com.fasterxml.jackson.annotation.JsonBackReference;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.springframework.format.annotation.DateTimeFormat;

import javax.persistence.*;
import java.io.Serializable;
import java.util.Date;
import java.util.List;

/**
 * User Entity
 *
 * @author Liuguanglei liuguanglei@ekeyfund.com
 * @create 2017-06-下午2:32
 */
@Entity
@Table(name = "springboot_user")
public class User  implements Serializable{

    @Id
    @Column(name = "user_id")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(name = "user_name")
    private String name;


    @Column(name = "user_password")
    private String password;


    @Column(name = "user_create_date")
    @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    private Date createDate;


    @ManyToOne
    @JoinColumn(name = "department_id")
    @JsonBackReference
    private Department department;



    @ManyToMany(cascade = {},fetch = FetchType.EAGER)
    @JoinTable(name = "springboot_user_role",joinColumns = {@JoinColumn(name="user_id")},
                inverseJoinColumns = {@JoinColumn(name = "role_id")}
    )
    private List<Role> roleList;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Date getCreateDate() {
        return createDate;
    }

    public void setCreateDate(Date createDate) {
        this.createDate = createDate;
    }

    public Department getDepartment() {
        return department;
    }

    public void setDepartment(Department department) {
        this.department = department;
    }

    public List<Role> getRoleList() {
        return roleList;
    }

    public void setRoleList(List<Role> roleList) {
        this.roleList = roleList;
    }

    @Override
    public String toString() {
        return new ToStringBuilder(this)
                .append("id", id)
                .append("name", name)
                .append("password", password)
                .append("createDate", createDate)
                .append("department", department)
                .append("roleList", roleList)
                .toString();
    }
}

4.2 数据访问Repository

主要包含UserRepository和DepartmentRepository

DepartmentRepository.java

package com.ekeyfund.springcloud.repository;

import com.ekeyfund.springcloud.entity.Department;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

/**
 * Created by tony on 2017/6/19.
 */
@Repository
public interface DepartmentRepository extends JpaRepository<Department,Long> {
}

UserRepoistory.java

package com.ekeyfund.springcloud.repository;

import com.ekeyfund.springcloud.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

import java.util.Collection;
import java.util.Date;
import java.util.List;

/**
 * User Repository
 *
 * @author Liuguanglei liuguanglei@ekeyfund.com
 * @create 2017-06-下午2:54
 */
@Repository
public interface UserRepository  extends JpaRepository<User,Long>{


    /**
     *  and
     * @param id
     * @param name
     * @return
     */
    User findByIdAndName(Long id, String name);


    User findByNameAndPassword(String name, String password);

    /**
     *  or
     * @param id
     * @param name
     * @return
     */
    User findByIdOrName(Long id, String name);


    /**
     * between
     * @param start
     * @param end
     * @return
     */
    List<User> findByCreateDateBetween(Date start, Date end);


    /**
     * lessThan
     * @param start
     * @return
     */
    List<User> getByCreateDateLessThan(Date start);

    /**
     * Greater Than
     * @param start
     * @return
     */
    List<User> findByCreateDateGreaterThan(Date start);


    /**
     * is null
     * @return
     */
    List<User> findByNameIsNull();


    /**
     * in
     * @param nameList
     * @return
     */
    List<User> findByNameIn(Collection<String> nameList);

}

4.3 业务逻辑Service

主要包含UserService,DepartmentService及其实现

UserService.java

package com.ekeyfund.springcloud.service;


import com.ekeyfund.springcloud.entity.User;

import java.util.List;

/**
 * Created by tony on 2017/6/19.
 */
public interface UserService {


    /**
     * 登录
     * @param name
     * @param password
     * @return
     */
    public User login(String name, String password);


    /**
     * 注册
     * @param user
     * @return
     */
    public User register(User user);


    /**
     * 注销
     * @param user
     * @return
     */
    void writeOff(User user);

    /**
     * 当前用户是否已经存在
     * @param user
     * @return
     */
    boolean isExists(User user);

     List<User> getAllUser();

     User getUserById(Long id);

}

UserServiceImpl.java

package com.ekeyfund.springcloud.service.impl;


import com.ekeyfund.springcloud.entity.User;
import com.ekeyfund.springcloud.repository.UserRepository;
import com.ekeyfund.springcloud.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.transaction.Transactional;
import java.util.List;

/**
 * User Service Impl
 *
 * @author Liuguanglei liuguanglei@ekeyfund.com
 * @create 2017-06-下午3:34
 */
@Service
@Transactional
public class UserServiceImpl implements UserService {



    @Autowired
    private UserRepository userRepository;


    @Override
    public User login(String name, String password) {
        return userRepository.findByNameAndPassword(name,password);
    }

    @Override
    public User register(User user) {
        return userRepository.save(user);
    }

    @Override
    public void writeOff(User user) {
         userRepository.delete(user);
    }

    @Override
    public boolean isExists(User user) {
        return userRepository.findOne(user.getId())!=null?true:false;
    }

    @Override
    public List<User> getAllUser() {
        return userRepository.findAll();
    }

    @Override
    public User getUserById(Long id) {
        return userRepository.findOne(id);
    }
}

DepartmentService.java

package com.ekeyfund.springcloud.service;


import com.ekeyfund.springcloud.entity.Department;

/**
 * Created by tony on 2017/6/19.
 */
public interface DepartmentService {

     Department saveDepartment(Department department);

     Department getDepartmentById(Long id);
}

DepartmentServiceImpl.java

package com.ekeyfund.springcloud.service.impl;


import com.ekeyfund.springcloud.entity.Department;
import com.ekeyfund.springcloud.repository.DepartmentRepository;
import com.ekeyfund.springcloud.service.DepartmentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.transaction.Transactional;

/**
 * Department Impl
 *
 * @author Liuguanglei liuguanglei@ekeyfund.com
 * @create 2017-06-下午3:12
 */
@Transactional
@Service
public class DepartmentImpl implements DepartmentService {


    @Autowired
    private DepartmentRepository departmentRepository;


    @Override
    public Department saveDepartment(Department department) {
        return departmentRepository.save(department);
    }

    @Override
    public Department getDepartmentById(Long id) {
        return departmentRepository.findOne(id);
    }
}

4.4 Controller层

主要包含提供User完整的Restful API 的UserController

UserController.java

package com.ekeyfund.springcloud.controller;

import com.ekeyfund.springcloud.entity.User;
import com.ekeyfund.springcloud.service.UserService;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.*;

import java.util.Date;
import java.util.List;

/**
 * UserController
 * Restful API
 * @author Liuguanglei liuguanglei@ekeyfund.com
 * @create 2017-06-下午11:24
 */
@RestController
public class UserController {



    private static final org.slf4j.Logger LOGGER = LoggerFactory.getLogger(UserController.class);


    @Autowired
    private DiscoveryClient discoveryClient;


    @Autowired
    private UserService userService;


    @GetMapping(value = "/list")
   public List<User> list(){

        ServiceInstance instance=discoveryClient.getLocalServiceInstance();
        LOGGER.info("call user/list service  host is  "+instance.getHost()+"service_id is "+instance.getServiceId());
        return userService.getAllUser();
   }

   @GetMapping(value = "/login")
   public User login( @RequestParam String name,@RequestParam String password){

       User user=userService.login(name,password);
       return user;
   }

   @PostMapping("/register")
   public String register(@ModelAttribute User user){
       User result =userService.register(user);
       return result!=null?"success":"fail";
   }

   @GetMapping("/get/{id}")
   public User get(@PathVariable Long id){

       return userService.getUserById(id);
   }

   @PutMapping("/update/{id}")
   public String update(@PathVariable Long id,@ModelAttribute User user){

       User updatedUser =userService.getUserById(id);
       updatedUser.setName(user.getName());
       updatedUser.setPassword(user.getPassword());
       updatedUser.setCreateDate(new Date());
       User result= userService.register(updatedUser);
       return result!=null?"success":"fail";

   }


   @DeleteMapping("/delete/{id}")
   public String delete(@PathVariable Long id){

       User user =new User();
       user.setId(id);
       userService.writeOff(user);

       return "success";
   }


}

4.5 Configuration

主要包含数据源Druid和JPA的配置

DruidConfiguation.java

package com.ekeyfund.springcloud.configuration;

import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;

/**
 * Druid Configuration
 *
 * @author Liuguanglei liuguanglei@ekeyfund.com
 * @create 2017-06-下午5:48
 */
public class DruidConfiguration {
    @Bean
    public ServletRegistrationBean statViewServle(){
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(),"/druid/*");
        //白名单：
        servletRegistrationBean.addInitParameter("allow","192.168.1.218,127.0.0.1");
        //IP黑名单 (存在共同时，deny优先于allow) : 如果满足deny的即提示:Sorry, you are not permitted to view this page.
        servletRegistrationBean.addInitParameter("deny","192.168.1.100");
        //登录查看信息的账号密码.
        servletRegistrationBean.addInitParameter("loginUsername","druid");
        servletRegistrationBean.addInitParameter("loginPassword","12345678");
        //是否能够重置数据.
        servletRegistrationBean.addInitParameter("resetEnable","false");
        return servletRegistrationBean;
    }

    @Bean
    public FilterRegistrationBean statFilter(){
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
        //添加过滤规则.
        filterRegistrationBean.addUrlPatterns("/*");
        //添加不需要忽略的格式信息.
        filterRegistrationBean.addInitParameter("exclusions","*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
        return filterRegistrationBean;
    }
}

JPAPersistenceConfiguration

package com.ekeyfund.springcloud.configuration;

import com.alibaba.druid.pool.DruidDataSource;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.vendor.HibernateJpaDialect;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;

import javax.persistence.EntityManagerFactory;
import javax.sql.DataSource;
import java.sql.SQLException;
import java.util.Properties;

/**
 * JPA Persistence Configuration
 *
 * @author Liuguanglei liuguanglei@ekeyfund.com
 * @create 2017-06-上午11:26
 */
@Order(Ordered.HIGHEST_PRECEDENCE)
@Configuration
@EnableTransactionManagement(proxyTargetClass = true) //启用JPA的事务管理
@EnableJpaRepositories(basePackages = "com.ekeyfund.springcloud.repository" )//启用JPA资源库并指定资源库接口位置
@EntityScan(basePackages = "com.ekeyfund.springcloud.entity")//指定实体的位置
public class JPAPersistenceConfiguration {



    private static final org.slf4j.Logger LOGGER = LoggerFactory.getLogger(JPAPersistenceConfiguration.class);


    /*******************数据库和连接池配置信息,读取application.properties文件的属性值****************************/
    @Value("${spring.datasource.driver-class-name}")
    private String driverClass;

    @Value("${spring.datasource.username}")
    private String userName;

    @Value("${spring.datasource.password}")
    private String password;

    @Value("${spring.datasource.url}")
    private String url;

    @Value("${spring.datasource.initialSize}")
    private int initialSize;

    @Value("${spring.datasource.minIdle}")
    private int minIdle;

    @Value("${spring.datasource.maxActive}")
    private int maxActive;

    @Value("${spring.datasource.maxWait}")
    private long maxWait;

    @Value("${spring.datasource.timeBetweenEvictionRunsMillis}")
    private long timeBetweenEvictionRunsMillis;

    @Value("${spring.datasource.minEvictableIdleTimeMillis}")
    private long minEvictableIdleTimeMillis;


    @Value("${spring.datasource.filters}")
    private String filters;


    @Value("${spring.datasource.connectionProperties}")
    private String connectionProperties;


    @Bean(name = "druidDataSource",initMethod = "init",destroyMethod = "close")
    public DataSource dataSource(){
        DruidDataSource druidDataSource =new DruidDataSource();
        druidDataSource.setDriverClassName(driverClass);
        druidDataSource.setUsername(userName);
        druidDataSource.setPassword(password);
        druidDataSource.setUrl(url);

        druidDataSource.setInitialSize(initialSize);
        druidDataSource.setMinIdle(minIdle);
        druidDataSource.setMaxActive(maxActive);
        druidDataSource.setMaxWait(maxWait);
        druidDataSource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
        druidDataSource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
        druidDataSource.setConnectionProperties(connectionProperties);
        try {
            druidDataSource.setFilters(filters);
        } catch (SQLException e) {
            LOGGER.error("build datasoure exception ",e.getMessage());
        }

        return druidDataSource;
    }



    @Bean(name = "entityManagerFactory")
    
                            
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                            原文链接：https://blog.csdn.net/ITTechnologyHome/article/details/73824784

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