基础知识

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Spring Boot是由Pivotal团队提供的全新框架，其设计目的是用来简化新Spring应用的初始搭建以及开发过程。该框架使用了特定的方式来进行配置，从而使开发人员不再需要定义样板化的配置。通过这种方式，Spring Boot致力于在蓬勃发展的快速应用开发领域(rapid application development)成为领导者。

我们通过Spring Boot搭建Web项目的后端服务

实战项目

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Main - 【GirlApplication】

Controller - 与前端连接【GirlController】

domain - 实体类(与数据库对应)【Girldb】

等等

按学习与配置顺序书写✍️

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pom.xml


   
       
    
     4.0.0
        
            
     
      org.springframework.boot
             
     
      spring-boot-starter-parent
             
     
      2.3.2.RELEASE
             
      
         
        
    
     com.imooc
        
    
     girl
        
    
     0.0.1-SNAPSHOT
        
    
     girl
        
    
     Demo project for Spring Boot
        
            
     
      1.8
         
        
            
                 
      
       org.springframework.boot
                  
      
       spring-boot-starter-web
              
             
                 
      
       org.springframework.boot
                  
      
       spring-boot-starter-test
                  
      
       test
                  
                      
                           
        
         org.junit.vintage
                            
        
         junit-vintage-engine
                        
                   
              
             
                 
      
       org.springframework.boot
                  
      
       spring-boot-configuration-processor
                  
      
       true
              
             
                 
      
       org.springframework.boot
                  
      
       spring-boot-starter-data-jpa
              
             
                 
      
       mysql
                  
      
       mysql-connector-java
              
         
        
            
                 
                      
       
        org.springframework.boot
                       
       
        spring-boot-maven-plugin

application-dev.yml (开发版本)

server:  port: 8080cupSize: Bage: 18content: "cuoSize: ${cupSize}, age: ${age}"girl:  cupSize: B  age: 18

application-prod.yml (正式版本)

server:  port: 8081cupSize: Bage: 18content: "cuoSize: ${cupSize}, age: ${age}"girl:  cupSize: F  age: 18

application.yml (正式抉择)

spring:  profiles:    active: dev  datasource:      driver-class-name: com.mysql.cj.jdbc.Driver      url: jdbc:mysql://localhost:3306/girl      username: root      password: root  jpa:    hibernate:      ddl-auto: update    show-sql: true

HelloController.java

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package com.imooc.girl;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Value;import org.springframework.web.bind.annotation.*;/** * @Author: TEAM-AG * @Description: 与前端连接 
   
     * @Date: Created in 21:55 2020-08-10 * @Modified By: */@RestController@RequestMapping("/hello")public class HelloController {
   //    @Value("${cupSize}")//    private String cupSize;//    @Value("${age}")//    private Integer age;//    @Value("${content}")//    private String content;    @Autowired    private GirlProperties girlProperties;    @GetMapping(value = {
   "/say{id}"})    public String say(@PathVariable("id") Integer id){
           return "TEAM-AG " + id + girlProperties.getCupSize() + girlProperties.getAge();    }//    @RequestMapping(value = {"/say"}, method = RequestMethod.GET)//    public String say(@RequestParam(value = "id", required = false, defaultValue = "0") Integer id){       // 默认值//        return "TEAM-AG " + id + girlProperties.getCupSize() + girlProperties.getAge();//    }}

GirlProperties

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package com.imooc.girl;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.boot.context.properties.EnableConfigurationProperties;import org.springframework.stereotype.Component;/** * @Author: TEAM-AG * @Description: 实体类 
   
     * @Date: Created in 22:25 2020-08-10 * @Modified By: */@Component@ConfigurationProperties(prefix = "girl")       // yml 对应的映射public class GirlProperties {
       private String cupSize;    private Integer age;    public String getCupSize() {
           return cupSize;    }    public void setCupSize(String cupSize) {
           this.cupSize = cupSize;    }    public Integer getAge() {
           return age;    }    public void setAge(Integer age) {
           this.age = age;    }}

Girldb

package com.imooc.girl;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;/** * @Author: TEAM-AG * @Description: 与数据库对应 
   
     * @Date: Created in 19:42 2020-08-13 * @Modified By: */@Entitypublic class Girldb {
       @Id    @GeneratedValue    private Integer id;    private String cupSize;    private Integer age;    public Girldb() {
              // 必须有一个无参 构造方法    }    public Integer getId() {
           return id;    }    public void setId(Integer id) {
           this.id = id;    }    public String getCupSize() {
           return cupSize;    }    public void setCupSize(String cupSize) {
           this.cupSize = cupSize;    }    public Integer getAge() {
           return age;    }    public void setAge(Integer age) {
           this.age = age;    }}

GirlRepository

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package com.imooc.girl;import org.springframework.data.jpa.repository.JpaRepository;import java.util.List;/** * @Author: TEAM-AG * @Description: 接口继承 Jpa * @Date: Created in 20:01 2020-08-13 * @Modified By: */public interface GirlRepository extends JpaRepository
   
     {
       // 接口本口 对数据库的操作都靠它！    // 查年龄    public List
    
      findByAge(Integer age);}

GirlController

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package com.imooc.girl;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.*;import java.util.List;import java.util.Optional;/** * @Author: TEAM-AG * @Description: 与前端连接 
   
     * @Date: Created in 19:54 2020-08-13 * @Modified By: */@RestControllerpublic class GirlController {
       @Autowired    private GirlRepository girlRepository;    @Autowired              // 事务    private GirlService girlService;/** * * @Description: * 查询 女生列表 * @auther: TEAM-AG * @date: 20:10 2020-08-13 * @param: [] * @return: java.util.List
    
      *【important】=> 用哪个，开哪个！ *///    @GetMapping(value = "/girls")                     // @查所有//    public List
     
       girldbList(){
   //        return girlRepository.findAll();////    }//    // 查询某个女生//    @GetMapping(value = "/girls")                       // @查某个id//    public Girldb Onegirldb(@RequestParam("id") Integer id){
   //        return girlRepository.findById(id).orElse(null);////    }//       // 查询某个女生//    @GetMapping(value = "/girls")                       // @查某个age  // 需要在 Girlrepository中加个接口//    public List
      
        Onegirldb(@RequestParam("age") Integer age){
   //        return girlRepository.findByAge(age);////    }/** * * @Description: * 插入 * @auther: TEAM-AG * @date: 21:15 2020-08-13 * @param: [cupSize, age] * @return: java.util.List
       
         *【important】=> 用哪个，开哪个！ *///    @PostMapping(value = "/girls")                                    // @插入后看所有//    public List
        
          addgirl(@RequestParam("cupSize") String cupSize,// @RequestParam("age") Integer age){ // 需要参数咯//// Girldb girl = new Girldb();// girl.setCupSize(cupSize);// girl.setAge(age);// girlRepository.save(girl);//// return girlRepository.findAll();//// }// @PostMapping(value = "/girls") // @插入后看那个// public Girldb addgirl(@RequestParam("cupSize") String cupSize,// @RequestParam("age") Integer age){ // 需要参数咯//// Girldb girl = new Girldb();// girl.setCupSize(cupSize);// girl.setAge(age);//// return girlRepository.save(girl);//// } @PostMapping(value = "/girls/cooinserttwo") public void girlTwo(){ girlService.insertTwo(); }/** * * @Description: * 更新 * @auther: TEAM-AG * @date: 21:30 2020-08-13 * @param: * @return: * *///@PostMapping(value = "/girls")//public Girldb updategirl(@RequestParam("id") Integer id,// @RequestParam("cupSize") String cupSize,// @RequestParam("age") Integer age){ // 需要参数咯//// Girldb girl = new Girldb();// girl.setId(id);// girl.setCupSize(cupSize);// girl.setAge(age);//// return girlRepository.save(girl);//////}/** * * @Description: * 删除 * @auther: TEAM-AG * @date: 21:30 2020-08-13 * @param: * @return: * *///@DeleteMapping(value = "/girls")// public void girlDelete(@RequestParam("id") Integer id){ // girlRepository.deleteById(id);////}}

GirlService

package com.imooc.girl;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import org.springframework.transaction.annotation.Transactional;/** * @Author: TEAM-AG * @Description: 事务管理 * 买商品与扣钱，两者都OK则OK，任何一个不通过交易都算失败 * @Date: Created in 10:29 2020-08-14 * @Modified By: */@Servicepublic class GirlService {
       @Autowired    private GirlRepository girlRepository;    @Transactional                              //事务    public void insertTwo(){
           Girldb girlA = new Girldb();        girlA.setCupSize("A");        girlA.setAge(18);        girlRepository.save(girlA);        Girldb girlB = new Girldb();        girlA.setCupSize("C");        girlA.setAge(18);        girlRepository.save(girlB);    }}

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