idea创建springboot项目

idea创建springboot项目

• 打开idea，点击create new project

• 选择spring Initializr 选择defalt 点击 next

• 输入Group artifact 点击next

• 选择web springweb 点击next

• 点击next finish

• 点击file settings 搜索到maven 设置成自己的maven路径

• import changes

• 打开SpringbootdemoApplication 运行成功

• 

• 新建controller 包 ，在包下新建HelloController类，

• 

• 输入如下代码，运行SpringbootdemoApplication

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1package com.run.springbootdemo.controller;

2

3import org.springframework.web.bind.annotation.RequestMapping;

4import org.springframework.web.bind.annotation.RestController;

5

6/**

7 * @author: zhaohb

8 * @create: 2019-10-22 16:28

9 **/

10

11@RestController

12public class HelloController {

13    @RequestMapping("/hello")

14    public String hello() {

15        return "hello,this is a springboot demo";

16    }

17}

18

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• 打开浏览器输入localhost:8080/hello

整合mybatis

• 添加依赖

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1<dependency>

2            <groupId>org.mybatis.spring.boot</groupId>

3            <artifactId>mybatis-spring-boot-starter</artifactId>

4            <version>1.3.2</version>

5        </dependency>

6

7        <dependency>

8            <groupId>mysql</groupId>

9            <artifactId>mysql-connector-java</artifactId>

10            <scope>runtime</scope>

11</dependency>

12

13

• 把application.properties改为application.yml , 新建application-dev.yml

application.yml

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1spring:

2  profiles:

3    active: dev

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5

application-dev.yml

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1server:

2  port: 8080

3

4spring:

5  datasource:

6    username: root

7    password: 123456

8    url: jdbc:mysql://localhost:3306/springboot?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC

9    driver-class-name: com.mysql.jdbc.Driver

10

11mybatis:

12  mapper-locations: classpath:mapping/*Mapper.xml

13  type-aliases-package: com.run.springbootdemo.entity

14

15#showSql

16logging:

17  level:

18    com:

19      run:

20        springbootdemo:

21          mapper : debug

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23

• 创建springboot数据库，创建user表

• 创建如下service,mapper包

• 创建UserController、UserService、UserServiceImpl、UserMapper、UserMapper.xml

UserController

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1package com.run.springbootdemo.controller;

2

3import com.run.springbootdemo.service.UserService;

4import org.springframework.beans.factory.annotation.Autowired;

5import org.springframework.web.bind.annotation.RequestMapping;

6import org.springframework.web.bind.annotation.RestController;

7

8import java.util.List;

9import java.util.Map;

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11/**

12 * @author: zhaohb

13 * @create: 2019-10-22 16:28

14 **/

15

16@RestController

17public class UserController {

18

19    @Autowired

20    private UserService userService;

21

22    @RequestMapping("/listuser")

23    public List<Map<String,Object>> listUser() {

24        return userService.listUser();

25    }

26}

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UserService

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1package com.run.springbootdemo.service;

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3import org.springframework.stereotype.Service;

4

5import java.util.List;

6import java.util.Map;

7

8/**

9 * @author: zhaohb

10 * @create: 2019-10-24 11:35

11 **/

12

13public interface UserService {

14    List<Map<String, Object>> listUser();

15}

16

17

18

UserServiceImpl

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1package com.run.springbootdemo.service.impl;

2

3import com.run.springbootdemo.mapper.UserMapper;

4import com.run.springbootdemo.service.UserService;

5import org.springframework.beans.factory.annotation.Autowired;

6import org.springframework.stereotype.Service;

7

8import java.util.List;

9import java.util.Map;

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11/**

12 * @author: zhaohb

13 * @create: 2019-10-24 11:38

14 **/

15@Service

16public class UserServiceImpl implements UserService {

17

18    @Autowired

19    private UserMapper userMapper;

20

21    @Override

22    public List<Map<String, Object>> listUser() {

23        return userMapper.listUser();

24    }

25}

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UserMapper

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1package com.run.springbootdemo.mapper;

2

3import org.springframework.stereotype.Repository;

4

5import java.util.List;

6import java.util.Map;

7

8/**

9 * @author: zhaohb

10 * @create: 2019-10-24 11:39

11 **/

12

13@Repository

14public interface UserMapper {

15    List<Map<String, Object>> listUser();

16}

17

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UserMapper.xml

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1<?xml version="1.0" encoding="UTF-8"?>

2<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

3<mapper namespace="com.run.springbootdemo.mapper.UserMapper">

4

5    <select id="listUser" resultType="map">

6        select * from user

7    </select>

8

9</mapper>

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• 在启动类上加入mapperscan注解

• 运行