SpringBoot实践 - SpringBoot+mysql

Posted 2020-08-31 路漫漫，其修远，吾将上下而求索

关于springBoot是个神马东西以及优缺点，请自行搜索了解。

LZ看到很多关于SpringBoot的Demo，单看一篇总是没法整合SpringBoot与mysql。没法子，还是自己操刀来一发为妙。

本文将叙述关于SpringBoot与mysql整合实践。

1.Eclipse 整合SpringBoot插件。(此步骤非常耗时，LZ本身尝试了多次。请在网络环境优情况下下进行操作)

　　a.Eclipse 安装STS插件：

　　 eclipse->help->Eclipse Marketplace

　　b.检测是否安装成功

　　　　安装成功后提示重启eclipse,重启后新建Project 出现如图

　　

 

2.新建SpringBoot Project

　　

-->next

-->next (选择您需要的依赖，Finish后会在pom.xml中出现对应jar依赖) 

-->Finish

项目结构如下：

package com.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/** 
* @ClassName: SpringBootDemoHelloApplication 
* @Description:
* SpringBootDemoHelloApplication.java 是SpringBoot应用程序入口，或者叫主程序。
* 注解@SpringBootApplication 标注他是一个SpringBoot应用，main方法使他成为一个主程序，将在应用启动时首先被执行。
* 注解@RestController 标注这也是一个控制器。
* @author mengfanzhu
* @date 2017年2月20日 下午6:36:42 
*/
@SpringBootApplication
@RestController
public class SpringBootDemoHelloApplication {

    @RequestMapping("/")
    public String hello(){
        return "hello boot";
    }
    
    public static void main(String[] args) {
        SpringApplication.run(SpringBootDemoHelloApplication.class, args);
    }
}

 

　　3.启动SpringBoot应用

　　　　方式1:选择项目->右键

　　

　　方式2: eclipse->Windows->Show View

　　

　　启动成功后：

　　

　　附加：

　　1.需要改动端口号：将resources下 application.properties 改为application.yml （个人爱好，可不改）

　　输入

server:
  port: 9090
  tomcat:
    uri-encoding: UTF-8  

　浏览器访问

　　

3.代码结构

　　 

4.代码示例

　　application.yml

server:
  port: 9090
  tomcat:
    uri-encoding: UTF-8  
  
spring:
  datasource:
    url: jdbc:mysql://localhost:3307/test?characterEncoding=UTF-8
    username: test1
    password: test1
    driver-class-name: com.mysql.jdbc.Driver
  jpa:
    database: MYSQL
    show-sql: true
    hibernate:
      ddl-auto: update
      naming-strategy: org.hibernate.cfg.ImprovedNamingStrategy
    properties:
      hibernate:
        dialect: org.hibernate.dialect.MySQL5Dialect

 

  pom.xml

<?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.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>spring_boot_demo_hello</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </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>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-cache</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>
                spring-boot-starter-data-elasticsearch
            </artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.sun.jna/jna -->
        <dependency>
            <groupId>com.sun.jna</groupId>
            <artifactId>jna</artifactId>
            <version>3.0.9</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-batch -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-batch</artifactId>
        </dependency>
        <!-- springboot 热部署 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <optional>true</optional><!-- optional=true,依赖不会传递，该项目依赖devtools；之后依赖myboot项目的项目如果想要使用devtools，需要重新引入 -->
    </dependency>  
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

 

User.java

package com.example.entity;

import java.io.Serializable;
import java.util.Date;
import java.util.List;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

import org.springframework.format.annotation.DateTimeFormat;

import com.fasterxml.jackson.annotation.JsonBackReference;


@Entity
@Table(name="boot_user")
public class User implements Serializable {
    
    /** 
    * @Fields serialVersionUID : TODO
    */ 
    private static final long serialVersionUID = -6550777752269466791L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    
    @Column(length=50,nullable=false)
    private String name;
    
    private String loginName;
    
    private String password;
    
    @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    private Date createdate;
    
    @ManyToOne
    @JoinColumn(name = "did")
    @JsonBackReference
    private Department department;
    
    @ManyToMany(cascade={},fetch = FetchType.EAGER)
    @JoinTable(name = "user_role",
        joinColumns={@JoinColumn(name="user_id")},
        inverseJoinColumns = {@JoinColumn(name="roles_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 Date getCreatedate() {
        return createdate;
    }

    public void setCreatedate(Date createdate) {
        this.createdate = createdate;
    }

    public String getLoginName() {
        return loginName;
    }

    public void setLoginName(String loginName) {
        this.loginName = loginName;
    }

    public String getPassword() {
        return password;
    }

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

    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;
    }

    public User() {
        super();
        // TODO Auto-generated constructor stub
    }

    public User(Long id, String name, String loginName, String password,
            Date createdate, Department department, List<Role> roleList) {
        super();
        this.id = id;
        this.name = name;
        this.loginName = loginName;
        this.password = password;
        this.createdate = createdate;
        this.department = department;
        this.roleList = roleList;
    }

    
}

 

Department.java,Role.java 代码参照User.java代码即可

UserDao.java

package com.example.dao;

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

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

import com.example.entity.User;
@Repository
public interface UserDao extends JpaRepository<User, Long> {
    
    User findByLoginNameLike(String name);

    User readByLoginName(String name);

    List<User> getByCreatedateLessThan(Date star);
}

 

DepartmentDao.java，RoleDao.java参考UserDao.java 即可，这样就实现了分页、增删改查等功能。很便捷有木有！那为什么呢？看下JpaRepository接口，方法命名规则及相关问题后续重点介绍.

 

UserController.java

package com.example.controller;

import java.util.HashMap;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.Assert;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import com.example.entity.User;
import com.example.service.DataService;
import com.example.service.UserService;

/** 
* @ClassName: UserController 
* @Description: User控制器
* @author mengfanzhu
* @date 2017年2月20日 下午5:58:19 
*/
@RestController
@RequestMapping("/user")
public class UserController {
    
    protected static Logger logger=LoggerFactory.getLogger(UserController.class);  
    @Autowired
    private UserService userService;
    @Autowired
    private DataService dataService;
    
    @RequestMapping("/demo/{name}")
    @ResponseBody
    public String demoShowName(@PathVariable String name){
         logger.debug("访问getUserByName,Name={}",name);  
         return "name is " + name;
    }
    /** 
     * @Title: UserController
     * @Description: 数据初始化
     * @author mengfanzhu
     * @throws 
     */
    @RequestMapping("/initdata")
    @ResponseBody
    public String initData(){
        dataService.initData();
        return "success";
    }
    
    /** 
     * @Title: UserController
     * @Description: 由loginName获取user
     * @param loginName
     * @author mengfanzhu
     * @throws 
     */
    @RequestMapping("/getUserByLoginName/{loginName}")
    @ResponseBody
    public Map<String,Object> getUserByName(@PathVariable String loginName){
        Map<String,Object> result = new HashMap<String, Object>();
        User user = userService.readByLoginName(loginName);
        Assert.notNull(user);
        result.put("name", user.getName());
        result.put("loginName", user.getLoginName());
        result.put("departmentName",user.getDepartment().getName());
        result.put("roleName", user.getRoleList().get(0).getName());
        return result;
    }
}

 

  JpaConfiguration.java

package com.example;

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.transaction.annotation.EnableTransactionManagement;


/** 
* @ClassName: JpaConfiguration 
* @Description: Jpa的配置类。
* @EnableTransactionManagement 启用了JPA 的事务管理
* @EnableJpaRepositories 启用了JPA资源库并指定了上面定义的接口资源库的位置
* @EntityScan 指定了定义实体的位置
* @author mengfanzhu
* @date 2017年2月20日 下午7:21:39 
*/
@Order(Ordered.HIGHEST_PRECEDENCE)
@Configuration
@EnableTransactionManagement(proxyTargetClass = true)
@EnableJpaRepositories(basePackages = "com.example.dao")
@EntityScan(basePackages = "com.example.entity")
public class JpaConfiguration {

    @Bean
    PersistenceExceptionTranslationPostProcessor persistenceExceptionTranslationPostProcessor(){
        return new PersistenceExceptionTranslationPostProcessor();
    }
}

 DataServiceImpl.java

package com.example.service;

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

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.Assert;

import com.example.dao.DepartmentDao;
import com.example.dao.RoleDao;
import com.example.dao.UserDao;
import com.example.entity.Department;
import com.example.entity.Role;
import com.example.entity.User;

@Service
public class DataServiceImpl implements DataService{
    
    @Autowired
    private UserDao userDao;
    @Autowired
    private RoleDao roleDao;
    @Autowired
    private DepartmentDao departmentDao;
    
    public void initData(){
        userDao.deleteAll();
        departmentDao.deleteAll();
        roleDao.deleteAll();
        
        Department department = new Department();
        department.setName("财务部");
        department.setCreatedate(new Date());
        
        departmentDao.save(department);
        Assert.notNull(department.getId(),"部门ID不能为空！");
        
        Role role = new Role();
        role.setName("管理员");
        role.setCreatedate(new Date());
        
        roleDao.save(role);
        Assert.notNull(role.getId(),"角色ID不能为空");
        
        User user = new User();
        user.setName("管理员");
        user.setLoginName("admin");
        user.setDepartment(department);
        List<Role> roleList = roleDao.findAll();
        Assert.notNull(roleList,"角色列表不能为空！");
        user.setRoleList(roleList);
        user.setPassword("admin");
        
        userDao.save(user);
        Assert.notNull(user.getId(),"用户ID不能为空！");
    }
}

 

UserServiceImpl.java

package com.example.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.example.dao.UserDao;
import com.example.entity.User;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserDao userDao;
    @Override
    public User readByLoginName(String name) {
        return userDao.readByLoginName(name);
    }

}

 

5.运行＋SpringBoot热部署 

<!-- springboot 热部署 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <optional>true</optional><!-- optional=true,依赖不会传递，该项目依赖devtools；之后依赖myboot项目的项目如果想要使用devtools，需要重新引入 -->
    </dependency>  

至于如何访问就不用过多介绍了吧。参照SpringMVC 即可。

代码已上传至 Github ，https://github.com/fzmeng/spring_boot_demo_hello

后续将介绍 SpringBoot 实践系列，敬请期待～～～