SpringBoot实践之---JPA连接数据库+idea全新创建该工程

录结构如下：



1.新建一个新的gradle项目









2.build.gradle配置文件

group 'com.great'
version '1.0-SNAPSHOT'

buildscript {
ext {
springBootVersion = '1.5.8.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
}
}

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'idea'
apply plugin: 'spring-boot'

jar {
baseName = 'ng-spring-boot'
version = '0.0.1-SNAPSHOT'
}
sourceCompatibility = 1.8
targetCompatibility = 1.8

repositories {
mavenCentral()
maven { url "https://repo.spring.io/libs-release" }
}

dependencies {
compile("org.springframework.boot:spring-boot-starter-data-jpa")
compile("org.springframework.boot:spring-boot-starter-web")
compile("org.springframework.boot:spring-boot-starter-actuator")
compile("mysql:mysql-connector-java")
compile("org.springframework.boot:spring-boot-starter-test")
}

task wrapper(type: Wrapper) {
gradleVersion = '2.3'
}

3.创建实体类

package com.great.dept.domain;

import org.hibernate.annotations.GenericGenerator;

import javax.persistence.*;

/**
* 部门表实体类
*/
@Entity
@Table(name = "dept")
public class Dept {

//部门编号 主键
@Id
@Column(name = "id")
@GeneratedValue(generator = "uuid2")
@GenericGenerator(name = "uuid2", strategy = "uuid2")
private String id;

//部门编码
@Column(name = "code")
private String code;

//部门名称
@Column(name = "name")
private String name;

public String getId() {
return id;
}

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

public String getCode() {
return code;
}

public void setCode(String code) {
this.code = code;
}

public String getName() {
return name;
}

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

4.创建JPA仓库类

package com.great.dept.repository;

import com.great.dept.domain.Dept;
import org.springframework.data.jpa.repository.JpaRepository;

/**
* 实现Jap仓库接口类
*/
public interface DeptRepository extends JpaRepository<Dept, String> {
}

5。创建controller类

package com.great.dept.web;

import com.great.dept.domain.Dept;
import com.great.dept.repository.DeptRepository;
import org.springframework.beans.factory.annotation.Autowired;
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;

/**
* 部门控制器
*/

@RestController
@RequestMapping("/test")
public class DeptController {

//部门Jap仓库接口
@Autowired
private DeptRepository deptRepository;

@RequestMapping(method = RequestMethod.GET)
public List<Dept> deptfind() {
List<Dept> deptList = deptRepository.findAll();
for (int i = 0; i < deptList.size(); i++) {
System.out.println(deptList.get(i));
}
return deptList;
}
}

6.新建属性文件application.properties，配置连接数据库的信息

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&useSSL=false
spring.datasource.username=root
spring.datasource.password=root

spring.jpa.database=mysql
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=update
#spring.jpa.hibernate.ddl-auto=create-drop
spring.jpa.hibernate.naming-strategy=org.hibernate.cfg.ImprovedNamingStrategy
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5Dialect

7.最后配置启动主函数*（spring Boot的被@SpringBootApplication注解的Application.Java必须放在所有的RestController的根路径的package下）

package com.great;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

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

访问路径： http://127.0.0.1:8080/test