SpringBoot 集成Spring-Data-JPA

一、使用的工具：

1、JDK1.8

2、Eclipse

3、Maven

二、创建项目

1、创建SpringBoot项目

2、Maven 依赖配置如下：

  4.0.0
  
    com.zzg
    SpringLearn
    0.0.1-SNAPSHOT
  
  JPADemo
  
        
        
            org.springframework.boot
            spring-boot-starter-web
        
        
        
            org.springframework.boot
            spring-boot-starter-data-jpa
        
        
        
            mysql
            mysql-connector-java
            8.0.11
        
        
        
            io.springfox
            springfox-swagger2
            2.2.2
        
        
            io.springfox
            springfox-swagger-ui
            2.2.2
        
        
        
            org.springframework.boot
            spring-boot-configuration-processor
            true
        
    
    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

SpringBoot 父类项目依赖配置文件如下：

  4.0.0
  com.zzg
  SpringLearn
  0.0.1-SNAPSHOT
  pom
  
		org.springframework.boot
		spring-boot-starter-parent
		1.5.6.RELEASE
  
  
  	HikariCPDemo
  	JPADemo
  

项目截图如下：

包说明：

com.zzg.springboot.controller:控制层代码

com.zzg.springboot.entity:实体对象与数据库表对于关系

com.zzg.springboot.repository:dao层接口定义

com.zzg.springboot.service:service 接口定义

cong.zzg.springboot.service.impl:service 接口实现类

com.zzg.springboot.swagger:swagger 配置属性

四、代码实现

要求：基于mysql +jpa 构建简单的查询实例

4.1 entity 与table 对应关系

package com.zzg.springboot.entity;

import javax.persistence.*;

@Entity
@Table(name = "sys_user")
public class SysUser {
	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY) // id自动增长
	private Long id;
	private String username;
	private String password;

	public Long getId() {
		return id;
	}

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

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public String getPassword() {
		return password;
	}

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

4.2 、dao 层接口定义：基于主键ID查询

package com.zzg.springboot.repository;

import org.springframework.data.jpa.repository.JpaRepository;
import com.zzg.springboot.entity.SysUser;

public interface SysUserRepository extends JpaRepository {
}

4.3、service层接口定义和service层接口实现：基于主键ID查询

package com.zzg.springboot.service;

import com.zzg.springboot.entity.SysUser;

public interface SysUserService {
	public SysUser findById(Long id);
}

package com.zzg.springboot.service.impl;

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

import com.zzg.springboot.entity.SysUser;
import com.zzg.springboot.repository.SysUserRepository;
import com.zzg.springboot.service.SysUserService;

@Service
public class SysUserServiceImpl implements SysUserService {
	@Autowired
    private SysUserRepository repository;
	
	public SysUser findById(Long id) {
		// TODO Auto-generated method stub
		return repository.findOne(id);
	}

}

4.4、controller 层实现

package com.zzg.springboot.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.zzg.springboot.entity.SysUser;
import com.zzg.springboot.service.SysUserService;

@RestController
@RequestMapping("/jpa")
public class JPAController {
	@Autowired
    private SysUserService service;
	
	@RequestMapping("/findById")
	public void findById() {
		SysUser bean = service.findById(1l);
		System.out.println("name is :" + bean.getUsername());
		System.out.println("password is :" + bean.getPassword());
	}

}

4.5、swagger 配置属性

package com.zzg.springboot.swagger;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

@Configuration
@EnableSwagger2
public class SwaggerConfigure {
	@Bean
    public Docket createRestApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo())
                .select()
                .apis(RequestHandlerSelectors.basePackage("com.zzg.springboot.controller"))
                .paths(PathSelectors.any())
                .build();
    }
	
	 private ApiInfo apiInfo() {
	        return new ApiInfoBuilder()
	                .title("Spring Boot中使用Swagger2构建RESTful APIs")
	                .description("Spring Boot Swagger2")
	                .termsOfServiceUrl("http://blog.csdn.net/zhouzhiwengang")
	                .contact("swagger")
	                .version("1.0")
	                .build();
	    }

}

4.6、程序入口

package com.zzg.springboot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@EnableAutoConfiguration
@ComponentScan
@Configuration
public class Application {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		SpringApplication.run(Application.class,args);
	}

}

五、建库脚本（sys_user）

CREATE TABLE `sys_user` (
	`id` BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
	`username` VARCHAR(200) NOT NULL COLLATE 'utf8mb4_general_ci',
	`password` VARCHAR(200) NOT NULL COLLATE 'utf8mb4_general_ci',
	PRIMARY KEY (`id`)
)
COLLATE='utf8mb4_general_ci'
ENGINE=InnoDB
AUTO_INCREMENT=3

今天就分享到这里。