1.映入jpa依賴(lài)

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

2.編寫(xiě)數(shù)據(jù)庫(kù)對(duì)應(yīng)實(shí)體

@Entity
@Table(name = "user")
public class User implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue
    private Long id;
    @Column(nullable = false,unique = true)
    private String userName;
    @Column(nullable = false)
    private String passWord;
    @Column(nullable = false,unique = true)
    private String email;
    @Column(nullable = false,unique = true)
    private String nickName;
    @Column(nullable = false)
    private String regTime;

    public User(){

    }

    public User(String userName, String passWord, String email, String nickName, String regTime) {
        this.userName = userName;
        this.passWord = passWord;
        this.email = email;
        this.nickName = nickName;
        this.regTime = regTime;
    }

    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;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getNickName() {
        return nickName;
    }

    public void setNickName(String nickName) {
        this.nickName = nickName;
    }

    public String getRegTime() {
        return regTime;
    }

    public void setRegTime(String regTime) {
        this.regTime = regTime;
    }
}

3.編寫(xiě)UserRepository繼承于JpaRepository条获，JpaRepository中默認(rèn)實(shí)現(xiàn)了多個(gè)方法遮晚，包括增刪改查啄寡。其中Jpa提供多個(gè)數(shù)據(jù)接口颖低，如：
a.CrudRepository 增刪改查接口
b.PagingAndSortingRepository分頁(yè)或 查詢(xún)接口拷窜，繼承與CrudRepository接口俭茧。
c.可以再實(shí)際需求自定義查詢(xún)接口

public interface UserRepository extends JpaRepository<User,Long> {
}

4.在Controller中調(diào)用撬腾，使用 @Autowired引入U(xiǎn)serRepository

@Autowired
    private UserRepository userRepository;


    @RequestMapping("/home")
    @ResponseBody
    String getProductData(){
        Date date = new Date();
        DateFormat dateFormat = DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.LONG);
        String formattedDate = dateFormat.format(date);
        userRepository.save(new User("aa1", "aa@126.com", "aa@126.com", "aa123456",formattedDate));
        //List<User> mList = userRepository.findAll();
        return "success";//+mList.size()
    }