springboot3+vue3项目实践-黑马
编辑时间：2024/12/30
来源：b站黑马
基础篇
导学课程
前置条件：
后端：javaSE JAVAWeb、SSM框架
前端：html、css、JavaScript
工具：JDK17+、IDEA2021+ 、maven3.5+、vscode
springboot概述
概述
springboot是spring提供的一个子项目，用于快速构建spring应用程序。
spring Framework核心功能:
spring Data 数据获取
spring AMQP 消息传递
spring security 认证连接
spring Cloud 服务治理
spring特性
起步依赖：本质就是一个Maven坐标、整合了完成一个功能需要的所有坐标
自动配置：遵循约定大约配置的原则，在boot程序启动后，一些bean对象会自动注入到ioc容器，不需要手动声明，简化开发
其他特性：内部的tomcat、Jetty（无需部署WAR文件）、外部化配置、不需要XML配置（properties/yml）
springboot入门
创建maven工程
导入spring-boot-stater-web起步依赖编写controller
java">@RestController
public class HelloController {@RequestMapping("/hello")public String hello(){System.out.println("Hello World~");return "Hello world~";}
}
提供启动类
java">//启动类
@SpringBootApplication
扫描itheima下的包(扫描的范围)
//@ComponentScan(basePackages = "com.itheima")
public class SpringbootQuickstartApplication {public static void main(String[] args) {SpringApplication.run(SpringbootQuickstartApplication.class, args);}}springboot工程建设
手动创建SpringBoot工程
创建maven工程
引入依赖
提供启动类
springboot配置文件
properties配置文件
yaml 配置文件
目的：
实现代码：
跳转路径改变：
开发中一般使用yml文件
yml配置信息书写和获取
1.配置信息书写
值钱边必须有空格，作为分隔符
使用空格作为缩进表示层级关系，相同层级左侧对齐
2.配置信息获取
@Value（“${键名}”）
@ConfigurationProperties（prefix=“前缀”）
springboot整合mybatis
1.创建表
create database if not exists mybatis;use mybatis;create table user(id int unsigned primary key auto_increment comment 'ID',name varchar(100) comment '姓名',age tinyint unsigned comment '年龄',gender tinyint unsigned comment '性别, 1:男, 2:女',phone varchar(11) comment '手机号'
) comment '用户表';insert into user(id, name, age, gender, phone) VALUES (null,'白眉鹰王',55,'1','18800000000');
insert into user(id, name, age, gender, phone) VALUES (null,'金毛狮王',45,'1','18800000001');
insert into user(id, name, age, gender, phone) VALUES (null,'青翼蝠王',38,'1','18800000002');
insert into user(id, name, age, gender, phone) VALUES (null,'紫衫龙王',42,'2','18800000003');
insert into user(id, name, age, gender, phone) VALUES (null,'光明左使',37,'1','18800000004');
insert into user(id, name, age, gender, phone) VALUES (null,'光明右使',48,'1','18800000005');2.创建工程 springbootquickstart
3.导入依赖
<dependency><groupId>com.mysql</groupId><artifactId>mysql-connector-j</artifactId></dependency>
<dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>3.0.3</version></dependency>
4.application.yml配置文件
#数据源
spring:datasource:driver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://localhost:3306/mybatisusername: rootpassword: 123456
mybatis:configuration:map-underscore-to-camel-case: true #开启驼峰命名和下划线命名的转换
5.创建pojo包，创建User.java
java">package com.itheima.springbootquickstart.pojo;public class User {private Integer id;private String name;private Short age;private Short gender;private String phone;public User() {}public User(Integer id, String name, Short age, Short gender, String phone) {this.id = id;this.name = name;this.age = age;this.gender = gender;this.phone = phone;}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 Short getAge() {return age;}public void setAge(Short age) {this.age = age;}public Short getGender() {return gender;}public void setGender(Short gender) {this.gender = gender;}public String getPhone() {return phone;}public void setPhone(String phone) {this.phone = phone;}@Overridepublic String toString() {return "User{" +"id=" + id +", name='" + name + '\'' +", age=" + age +", gender=" + gender +", phone='" + phone + '\'' +'}';}
}6.创建mapper包，创建Usermapper.java
java">package com.itheima.springbootquickstart.mapper;
import com.itheima.springbootquickstart.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;@Mapper
public interface UserMapper {@Select("select * from user where id= #{id}")public User findById(Integer id);}
7.创建Service包，创建UserService.java
java">package com.itheima.springbootquickstart.service;import com.itheima.springbootquickstart.pojo.User;public interface UserService {public User findById(Integer id);
}
8.创建impl包，创建接口的实现类UserServiceImpl.java
java">package com.itheima.springbootquickstart.service.impl;
import org.springframework.stereotype.Service;
import com.itheima.springbootquickstart.pojo.User;
import com.itheima.springbootquickstart.service.UserService;
import com.itheima.springbootquickstart.mapper.UserMapper;public class UserServiceImpl implements UserService {@Autowiredprivate UserMapper userMapper;@Overridepublic User findById(Integer id){return userMapper.findById(id);}}
9.创建Controller包，创建UserController.java
java">package com.itheima.springbootquickstart.controller;
import com.itheima.springbootquickstart.pojo.User;
import com.itheima.springbootquickstart.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;@RestController
@Validatedpublic class UserController {@Autowiredprivate UserService userService;@RequestMapping("/findById")public User findById(Integer id){return userService.findById(id);}}效果演示
