使用idea快速创建springbootWeb项目(springboot+springWeb+mybatis-Plus)

idea快速创建springbootWeb项目

详细步骤如下

1）创建项目

2）选择springboot版本

3）添加web依赖

4）添加Thymeleaf

5）添加lombok依赖

然后点击create进入下一步

双击pom.xml文件

6）添加mybatis-plus依赖

这里使用的springboot版本比较新，mybatis-plus-boot-starter 不兼容 ，需要一下导入一下依赖

<!--导入mybatis-plus-->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.5.7</version>
    <exclusions>
        <exclusion>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<!-- mybatis-spring -->
<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis-spring</artifactId>
    <version>3.0.3</version>
</dependency>

依赖导入成功

7）导入mysql驱动

<dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.33</version> </dependency>

8）配置application.yml文件

把applicaiton.propitious删除创建application.yml

spring:
  application:
    name: xiji
  datasource:
    url: jdbc:mysql://localhost:3306/users?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai
    username: root #数据库登录名
    password: root #数据库密码
    driver-class-name: com.mysql.cj.jdbc.Driver
mybatis-plus:
  mapper-locations: classpath:mapper/*.xml

9）在mysql中 ==》 创建数据库users==》创建表user

CREATE TABLE `user` (
  `userid` int NOT NULL AUTO_INCREMENT COMMENT '用户id',
  `username` varchar(255) DEFAULT NULL COMMENT '用户名字',
  `userPassword` varchar(255) DEFAULT NULL COMMENT '用户密码',
  PRIMARY KEY (`userid`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

创建完毕之后如下

10）创建包

1.创建controller包

依次创建如下包结构

2.controller包下的代码如下

package com.xiji.springbootweb.controller;
import com.xiji.springbootweb.entiy.User;
import com.xiji.springbootweb.service.UserService;
import jakarta.annotation.Resource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.Banner;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@Controller
public class UserController {
    @Resource
    UserService userService;
    @GetMapping("/")
    public String index(){
        return "index";
    }
    @GetMapping("/list")
    public  String list(Model model){
        List<User> list = userService.list();
        model.addAttribute("list", list);
        return "model";
    }
}

@Controller注解用来标注controller层

@Resource用来注入容器中的组件

@Autowired 这个也可以用来注入组件

3.entiy包下的代码如下

package com.xiji.springbootweb.entiy;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@NoArgsConstructor
@AllArgsConstructor
@TableName("user")
public class User {
    @TableField("userid")
    private int userid;
    @TableField("username")
    private String username;
    @TableField("userPassword")
    private String userPassword;
}

@Data用来生成get,set方法

@NoArgsConstructor用来生成无参构造方法

@AllArgsContructor用来生成全参构造

@TableName() 数据库表名

@TableField() 数据表列名

4.mapper包下的代码如下

package com.xiji.springbootweb.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.xiji.springbootweb.entiy.User;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface UserMapper extends BaseMapper<User> {
}

@mapper用来标注持久层

UserMapper 继承 BaseMapper<实体> 原因里面有很多已经实现的方法

5.service包下impl包的代码如下

package com.xiji.springbootweb.service.impl;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.xiji.springbootweb.entiy.User;
import com.xiji.springbootweb.mapper.UserMapper;
import com.xiji.springbootweb.service.UserService;
import org.springframework.stereotype.Service;
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {
}

@service用来表组service层的

UserServiceImpl 继承Service<Mapper,实体> 实现 UserService 原因里面有很多已经实现的方法

6.service包下的代码

package com.xiji.springbootweb.service;
import com.baomidou.mybatisplus.extension.service.IService;
import com.xiji.springbootweb.entiy.User;
public interface UserService extends IService<User> {
}

UserService继承 IService 接口

7.resource下mapper代码如下

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.xiji.springbootweb.mapper.UserMapper">
</mapper>

8.resource下templates代码如下

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body >
    <div class="bgStyle">
        <h1>这是主页</h1>
    </div>
</body>
</html>

9.resource下model页的代码

<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <div>
        <h1 > 这是list页面</h1>
        <h1 th:text="${list}"></h1>
    </div>
</body>
</html>

11）点击启动

12)访问localhost:8080

13)访问localhost:8080/list

需要自己往表中添加数据