javaweb各种框架组合案例(六)：springboot+spring data jpa（hibernate）+restful

一、介绍

1.springboot是spring项目的总结+整合

　　当我们搭smm,ssh,ssjdbc等组合框架时，各种配置不胜其烦，不仅是配置问题，在添加各种依赖时也是让人头疼，关键有些jar包之间还会出现冲突，让你的项目出现难以解决的问题。基于这种情况，springboot横空出世，在考虑到Struts控制层框架有漏洞，springboot放弃（大多数企业同样如此）了Struts，转而代之是springMVC，不过，springboot是自动集成springMVC的，不需要任何配置，不需要任何依赖，直接使用各种控制层注解。springboot是springcloud的基础，是开启微服务时代的钥匙。

二、新建springboot工程

1. 使用idea2019新建project，选择spring Initializr，next

2. 填写坐标信息，next

3. web选择Spring Web Starter，SQL选择Spring Data JPA、MySQL Driver，next

4. 填写项目名已经存放位置，finish

三、项目构建

1. pom.xml

　　springboot工程默认，包含spring-boot-starter-web、spring-boot-starter-test、spring-boot-starter-data-jpa以及mysql驱动

2. 业务实现

　　实现一个用户拥有多部手机的业务

3. 配置文件

　　application.properties

########################################################
###数据库连接信息
########################################################
#连接地址
spring.datasource.url=jdbc:mysql://localhost:3306/springboot_data_jpa?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
#useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC　　设置时区，不然可能会报错

#数据库账户 
spring.datasource.username=root 
#数据库密码 
spring.datasource.password=root 
#数据库驱动 
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver 
######################################################## 
### Java Persistence Api JPA相关配置 
######################################################## 
#指定数据库类型 
spring.jpa.database=mysql 
#控制台打印sql 
spring.jpa.show-sql=true 
#建表策略，这里用update，即根据实体更新表结构 
spring.jpa.hibernate.ddl-auto=update 
#表中字段命名策略,这里要引入hibernate的核心包，不然这个命名策略会报错 
spring.jpa.hibernate.naming.implicit-strategy=org.hibernate.boot.model.naming.ImplicitNamingStrategyLegacyJpaImpl 
spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl 
spring.jpa.hibernate.naming.strategy=org.hibernate.cfg.ImprovedNamingStrategy 
#方言 
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5Dialect

4. entity实体类

package club.xcreeper.springboot_spring_data_jpa.entity;

import javax.persistence.*;

@Entity
@Table(name = "phone")
public class Phone {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    private String brand;

    public Integer getId() {
        return id;
    }

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

    public String getBrand() {
        return brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }

}

Phone

package club.xcreeper.springboot_spring_data_jpa.entity;

import javax.persistence.*;
import java.util.List;

@Entity
@Table(name = "user")
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    private String username;

    private String password;

    @OneToMany(targetEntity = Phone.class)
    @JoinColumn(name = "user_id")
    private List<Phone> phones;

    public List<Phone> getPhones() {
        return phones;
    }

    public void setPhones(List<Phone> phones) {
        this.phones = phones;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer 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;
    }
}

User

5. dao层

package club.xcreeper.springboot_spring_data_jpa.dao;

import club.xcreeper.springboot_spring_data_jpa.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;

import java.io.Serializable;

public interface UserDao extends JpaRepository<User, Serializable> {
    User findByUsernameAndPassword(String username,String password);
}

6. service层

package club.xcreeper.springboot_spring_data_jpa.service;

import club.xcreeper.springboot_spring_data_jpa.entity.User;

public interface UserService {
    User findByUsernameAndPassword(String username,String password);
}

package club.xcreeper.springboot_spring_data_jpa.service.impl;

import club.xcreeper.springboot_spring_data_jpa.dao.UserDao;
import club.xcreeper.springboot_spring_data_jpa.entity.User;
import club.xcreeper.springboot_spring_data_jpa.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserDao userDao;

    @Override
    public User findByUsernameAndPassword(String username, String password) {
        return userDao.findByUsernameAndPassword(username,password);
    }
}

7. controller层

package club.xcreeper.springboot_spring_data_jpa.controller;

import club.xcreeper.springboot_spring_data_jpa.entity.User;
import club.xcreeper.springboot_spring_data_jpa.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserService userService;

    @GetMapping(value = "/getOne",params = {"username","password","username!=","password!="})//这里属性要用value而不能用name，name不起作用
    public User getUser(String username,String password) {
        return userService.findByUsernameAndPassword(username,password);
    }
}

8. 启动程序后，数据库表生成，需要添加数据

user表　　　　　　　　　　　　　　phone表

9. postman测试