用IDEA搭建第一个SpringBoot+SpringData Jpa框架

本文纯属自己的一些摸索和实践，如有写的不好的地方欢迎大家一起讨论。

1. 首先我们来创建一个maven项目。

1. 创建java目录并将其变为Sources Root文件夹。
   
   

3.接下来配置pom.xml文件里的一些依赖

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0modelVersion>
  <groupId>cn.atbengroupId>
  <artifactId>sbootartifactId>
  <packaging>warpackaging>
  <version>1.0-SNAPSHOTversion>
  <name>sboot Maven Webappname>
  <url>http://maven.apache.orgurl>

  <parent>
    <groupId>org.springframework.bootgroupId>
    <artifactId>spring-boot-starter-parentartifactId>
    <version>1.5.1.RELEASEversion>
  parent>

  <dependencies>
    <dependency>
      <groupId>junitgroupId>
      <artifactId>junitartifactId>
      <version>3.8.1version>
      <scope>testscope>
    dependency>
    <dependency>
      <groupId>org.springframework.bootgroupId>
      <artifactId>spring-boot-starter-webartifactId>
    dependency>
    
    <dependency>
      <groupId>mysqlgroupId>
      <artifactId>mysql-connector-javaartifactId>
      <version>5.1.39version>
    dependency>
    
    <dependency>
      <groupId>org.springframework.bootgroupId>
      <artifactId>spring-boot-starter-thymeleafartifactId>
      <version>1.4.0.RELEASEversion>
    dependency>
    
    <dependency>
      <groupId>org.springframework.bootgroupId>
      <artifactId>spring-boot-starter-data-jpaartifactId>
      <version>1.5.1.RELEASEversion>
    dependency>
  dependencies>
  <build>
    <finalName>sbootfinalName>
  build>
project>

4.配置application.properties配置文件，放在resources目录下。

server.port=8080
server.tomcat.uri-encoding=utf-8

#MySQL
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/test?characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=123

#Spring Data JPA
spring.jpa.database=MYSQL
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

5.到此框架配置文件就结束了，没错，springboot最大的优点就是省去了繁琐的xml配置文件，接下来我们来写一个接口试试。

/**Sboot.java**/
package cn.atben.sboot.pojo;

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

/**
 * Created by atben
 * 2018-01-24 14:58
 */
@Entity
@Table(name = "sboot")
public class Sboot {
    @Id
    @GeneratedValue
    private Integer id;

    private String test1;

    private String test2;

    public Integer getId() {
        return id;
    }

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

    public String getTest1() {
        return test1;
    }

    public void setTest1(String test1) {
        this.test1 = test1;
    }

    public String getTest2() {
        return test2;
    }

    public void setTest2(String test2) {
        this.test2 = test2;
    }
}

/**SbootController**/
package cn.atben.sboot.controller;

import cn.atben.sboot.repository.SbootRepositoty;
import cn.atben.sboot.pojo.Sboot;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

/**
 * Created by atben
 * 2018-01-24 14:31
 */
@RestController
@EnableAutoConfiguration
public class SbootController {

    @Autowired
    private SbootRepositoty sbootRepositoty;

    @RequestMapping(value = "/hi")
    public String hi(){
        return "hi!";
    }

    @GetMapping(value = "/list")
    public List list(){
        return sbootRepositoty.findAll();
    }

    @GetMapping(value = "/delete")
    public int deletelist(int id){
        sbootRepositoty.delete(id);
        return 1;
    }
}

/**SbootRepositoty**/
package cn.atben.sboot.repository;

import cn.atben.sboot.pojo.Sboot;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

/**
 * Created by atben
 * 2018-01-24 15:11
 */
@Repository
public interface SbootRepositoty extends JpaRepository{
}

由于springboot集成了tomcat，不需要讲程序打包部署到tomcat服务器，我们只需要写一个入口。

/**Entry**/
package cn.atben.sboot.configuration;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

/**
 * Created by atben
 * 2018-01-24 15:36
 * *项目启动入口，配置包根路径
 */
@SpringBootApplication
@ComponentScan(basePackages = "cn.atben")
public class Entry {
    public static void main(String[] args) throws Exception {
        SpringApplication.run(Entry.class, args);
    }
}

/**JpaConfiguration**/
package cn.atben.sboot.configuration;

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;

/**
 * Created by atben
 * 2018-01-24 15:33
 */
@Order(Ordered.HIGHEST_PRECEDENCE)
@Configuration
@EnableTransactionManagement(proxyTargetClass = true)
@EnableJpaRepositories(basePackages = "cn.atben.sboot.repository")
@EntityScan(basePackages = "cn.atben.sboot.pojo")
public class JpaConfiguration {
    @Bean
    PersistenceExceptionTranslationPostProcessor persistenceExceptionTranslationPostProcessor(){
        return new PersistenceExceptionTranslationPostProcessor();
    }
}

到此框架搭建完成，找到Entry.java右键run，即可将程序跑起来了。