1.编码方式

1.1pom.xml配置

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>

1.2application.properties配置

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/test?characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=root

spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true
spring.jackson.serialization.indent_output=true

1.3项目目录

domain
  pojo的存放位置
dao
  dao的存放位置
web
  控制器层

1.4User.java

package com.shuai.spring_boot_1.domain;

import java.io.Serializable;

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

@Entity
@Table(name = "t_user")
public class User implements Serializable{
    private static final long serialVersionUID = -644511628313198178L;
    @Id
    @GeneratedValue
    private Integer id;
    private String name;
    private int age;
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
}

1.5UserRepository.java

package com.shuai.spring_boot_1.dao;

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

import com.shuai.spring_boot_1.domain.User;

public interface UserRepository extends JpaRepository<User, Integer>{

}

1.6OneController.java

package com.shuai.spring_boot_1.web;

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

import com.shuai.spring_boot_1.dao.UserRepository;
import com.shuai.spring_boot_1.domain.User;

@RestController
public class OneController {

    @Autowired
    private UserRepository userRepository;

    @RequestMapping("/add")
    public String add() {
        User user = new User();
        user.setId(1);
        user.setName("123");
        user.setAge(20);
        userRepository.save(user);
        System.out.println("保存成功");
        return "ok";
    }   
}

1.7App.java

package com.shuai.spring_boot_1;

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

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

1.8运行项目

运行App.java中的main方法

1.9访问项目

http://localhost:8080/add