企业官网建设流程全解析

目录

一、创建项目

二、配置 pom.xml 依赖文件

三、设置 maven，下载依赖

四、配置 application.yml

五、主启动类中，添加注解

1.@MapperScan("com.example.*.mapper")

2.@Configration

六、编写代码

1. entity

2. mapper

3. service

4. controller

七、选择application类， 点击运行

八、搭建项目遇到的坑

一、创建项目

(阿里云地址： https://start.aliyun.com/ )
注意：springboot3版本，需要Java17及以上；springboot2版本一般用Java1.8。

二、配置 pom.xml 依赖文件

<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.6.13</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.edward</groupId> <artifactId>demo-takeout</artifactId> <version>0.0.1-SNAPSHOT</version> <name>demo-takeout</name> <description>demo-takeout</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.5.3</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.32</version> </dependency> <dependency> <groupId>org.freemarker</groupId> <artifactId>freemarker</artifactId> <version>2.3.32</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-surefire-plugin</artifactId> <version>2.5</version> <configuration> <skip>true</skip> </configuration> </plugin> </plugins> <resources> <resource> <directory>src/main/resources</directory> <includes> <include>**/*.yml</include> <include>**/*.xml</include> </includes> <filtering>true</filtering> </resource> <resource> <directory>src/main/java</directory> <includes> <include>**/*.yml</include> <include>**/*.xml</include> </includes> <filtering>true</filtering> </resource> </resources> </build> </project>

三、设置 maven，下载依赖

配置好后点击 install 安装依赖

四、配置 application.yml

server: port: 8888 spring: datasource: username: root password: 8888888 url: jdbc:mysql://localhost:3306/sky_take_out?serverTimezone=GMT%2B8&characterEncoding=utf-8&useSSL=false driver-class-name: com.mysql.cj.jdbc.Driver mybatis-plus: type-aliases-package: com.example.demotakeout.entity mapper-locations: classpath:mybatis/*.xml

五、主启动类中，添加注解

1.@MapperScan("com.example.*.mapper")

2.@Configration

注意：启动类的层级！！！

六、编写代码

1. entity

2. mapper

如果启动类中没有添加@MapperScan注解，则Mapper中需要添加 @Repository

DishMapper.xml:

<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <!--namespace 绑定一个对应的Mapper接口--> <mapper namespace="com.example.demotakeout.mapper.DishMapper"> <select id="list" resultType="Dish"> select * from dish </select> <insert id="insertOne" parameterType="Dish"> insert into dish(name, category_id, price, image, description, status, create_time, create_user, update_time, update_user) values (#{name},#{categoryId},#{price},#{image},#{description},#{status},#{createTime},#{createUser},#{updateTime},#{updateUser}) </insert> </mapper>

3. service

注意：(@service注解写在实现类中，而不是interface中！！！)

4. controller

[代码]：

package com.edward.system.controller; import com.edward.system.entity.User; import com.edward.system.service.impl.UserServiceImpl; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RestController; import java.util.List; @RestController @RequestMapping("/system/user") public class UserController { @Autowired private UserServiceImpl userServiceImpl; @GetMapping("/hello") public String hello() { return "你好，世界"; } @GetMapping("/all") public List<User> getAllUser() { List<User> userList = userServiceImpl.list(); return userList; } }

七、选择application类， 点击运行

控制台上出现下方log时，表示在 localhost:9999 上启动成功：

访问页面：

八、搭建项目遇到的坑

1. springboot3以上，要求jdk17及以上；
2. 建好项目后，点开setting—>maven，手动更改maven为阿里云，并选择本地maven中相应的配置文件和仓库；
3. 点击install进行依赖项下载；
4. 下载完毕后显示build success，但是启动类和test类里都没有启动按钮，原因：注解未生效；
5. 注解不生效原因：idea调为了省电模式；
6. 关掉省电模式：Power Save Mode；
7. 彻底清除缓存并重启：file -> Invalidate Caches/Restart；
8. 点击启动按钮后服务未正常启动原因：约定大于配置，启动类里没有@configuration注解，要yml配置文件等目录要放在规定好的层级里；
9. 没有查出数据原因：@service注解在实现类，而不是interface里

10. 当idea右侧没有Database选项时，可以通过如下步骤添加：

然后就有了：