spring boot++jpa+ mysql +maven

项目结构图：

一、 添加mysql 配置

1 在pom.xml中添加 maven依赖

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

2 在appliation.properties 文件中添加 配置项

#DB Configuration:
spring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/dbtest?characterEncoding=utf8&useSSL=false
spring.datasource.username = root
spring.datasource.password = 123456

二 、添加 jpa maven依赖

<!--jpa-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

在  appliation.properties 文件中添加 配置项

#JPA Configuration
spring.jpa.database = MYSQL
# Show or not log for each sql query
spring.jpa.show-sql = true
spring.jpa.hibernate.ddl-auto=update
# Naming strategy
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy
# stripped before adding them to the entity manager)
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

三 、 新建实体类 Account

package com.example.demo.domain;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class Account {
    public long getId() {
        return id;
    }

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

    public String getLogin_name() {
        return login_name;
    }

    public void setLogin_name(String login_name) {
        this.login_name = login_name;
    }

    public String getLogin_pwd() {
        return login_pwd;
    }

    public void setLogin_pwd(String login_pwd) {
        this.login_pwd = login_pwd;
    }

    public String getReal_name() {
        return real_name;
    }

    public void setReal_name(String real_name) {
        this.real_name = real_name;
    }

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
     private  long id;
     private  String login_name;
     private  String login_pwd;
     private  String real_name;

}

@entity 实体标记注解

@Id   id主键标记注解

四、创建AccountRepository 接口 继承自JPARepository

package com.example.demo.dao;

import com.example.demo.domain.Account;
import org.springframework.data.jpa.repository.JpaRepository;

import java.util.List;

public interface AccountRepository extends JpaRepository<Account,Long> {
     List<Account> findAllByOrderByIdDesc();

}

JPA 会自动生成AccountRepository 的实现类

五、 创建IAccountService 服务接口及实现类

IAccountService.java 接口

package com.example.demo.service;

import com.example.demo.domain.Account;

import java.util.List;

public interface IAccountService {
     List<Account>  findAll();
     Account findAccountByName(String login_name);

     void Create(Account model);
}

AccountService 实现类 ，服务类，必须标记@Service 注解，通过@autowired 自动注入 accountRepository 接口

package com.example.demo.service.impl;

import com.example.demo.dao.AccountRepository;
import com.example.demo.domain.Account;
import com.example.demo.service.IAccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class AccountService implements IAccountService {
    @Autowired
    AccountRepository accountRepository ;

    @Override
    public List<Account> findAll() {
        return this.accountRepository.findAllByOrderByIdDesc();
    }

    @Override
    public Account findAccountByName(String login_name) {
        return null;
    }

    @Override
    public void Create(Account model) {
        this.accountRepository.save(model);
    }
}

六、 AccountController 类

package com.example.demo.controller;

import com.example.demo.dao.AccountRepository;
import com.example.demo.domain.Account;
import com.example.demo.service.IAccountService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiParam;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@Api(value = "Account api",description ="api of account")
@RestController
@RequestMapping("/account")
public class AccountController {

    @Autowired
     IAccountService  accountService ;

      @ApiOperation(value="account index list", notes = "账户列表信息")
      @RequestMapping(value = "/index",method = RequestMethod.GET)
      public List<Account> index(){
          return this.accountService.findAll();
      }

    @ApiOperation(value="create a account", notes = "a account name")

    @RequestMapping(value = "/create",method = RequestMethod.POST)
      public  void create(
            @ApiParam( name="model",value = "input a account entity") @RequestBody  Account model)
      {
            this.accountService.Create(model);
      }
}

http://localhost:8080/account/index   访问所有账号，返回结果：

[{"id":7,"login_name":"admin","login_pwd":"admin","real_name":"jack"}]

http://localhost:8080/account/create    接口post 创建账号，返回结果： （这里应该做一个统一的包装类进行返回）