Spring Boot 项目搭建

开发环境：IntelliJ IEDA

1.新建项目

这里直接next

设置group和artifact

DevTools顾名思义是开发工具，热更新等，lombok都知道，validation是表单验证或者说参数检查工具

点击完成

2.配置项目

等待IDEA自动下载完成依赖后就可以开始配置项目了，项目目录结构：

这里我将另一个项目的截图贴出来

目录结构

将application.properties文件改名为application.yml，写入配置：

server:
  port: 8080
spring:
  http:
    encoding:
      enabled: true
      charset: UTF-8
      force: true
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/design?useUnicode=true&characterEncoding=UTF8&serverTimezone=GMT
    username: root
    password: root
    driver-class-name: com.mysql.cj.jdbc.Driver
mybatis:
  type-aliases-package: com.clown.design.entity
  mapper-locations: classpath:mapper/*.xml

项目名+Application SpringBoot主类：

package com.clown.design;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@MapperScan(basePackages = "com.clown.design.dao")
@SpringBootApplication
public class DesignApplication {

    public static void main(String[] args) {
        SpringApplication.run(DesignApplication.class, args);
    }

}

Role:

package com.clown.design.entity;
import lombok.Data;
@Data
public class Role {
    private Integer id;
    private String roleName;
    private String passWord;
    private Integer roleType;
}

IRoleDao：

package com.clown.design.dao;
import com.clown.design.entity.Role;
public interface IRoleDao {
    Role selectRoleById(Integer id);
}

RoleDaoMapper：

<?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.clown.design.dao.IRoleDao">
    <resultMap id="roleResult" type="com.clown.design.entity.Role">
        <id column="id" property="id"/>
        <result column="roleName" property="roleName"/>
        <result column="passWord" property="passWord"/>
        <result column="roleType" property="roleType"/>
    </resultMap>

    <select id="selectRoleById" parameterType="Integer" resultType="com.clown.design.entity.Role">
        SELECT * FROM role WHERE id = #{id}
    </select>

</mapper>

IRoleSerivce：

package com.clown.design.service;
import com.clown.design.entity.Role;
public interface IRoleSerivce {
    Role getRoleById(Integer id);
}

RoleServiceImpl：

package com.clown.design.service.impl;
import com.clown.design.dao.IRoleDao;
import com.clown.design.entity.Role;
import com.clown.design.service.IRoleSerivce;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class RoleServiceImpl implements IRoleSerivce {
    @Autowired
    private IRoleDao roleDao;
    @Override
    public Role getRoleById(Integer id) {
        return this.roleDao.selectRoleById(id);
    }
}

RoleController：

package com.clown.design.controller;
import com.clown.design.entity.Role;
import com.clown.design.service.IRoleSerivce;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
@CrossOrigin
@RestController
@RequestMapping("/role")
public class RoleController {
    @Autowired
    private IRoleSerivce roleSerivce;
    @RequestMapping(value = "/getRoleById", method = RequestMethod.GET)
    public Map<String, Object> getRoleById(HttpServletRequest request, HttpServletResponse response, Role role) throws IOException {
        Map<String, Object> map = new HashMap<>();
        map.put("data", this.roleSerivce.getRoleById(role.getId()));
        return map;
    }
}