详解intellij idea搭建SpringBoot

vSpring Boot概念

从最根本上来讲，Spring Boot就是一些库的集合，它能够被任意项目的构建系统所使用。简便起见，该框架也提供了命令行界面，它可以用来运行和测试Boot应用。框架的发布版本，包括集成的CLI（命令行界面），可以在Spring仓库中手动下载和安装。

• 创建独立的Spring应用程序
• 嵌入的Tomcat，无需部署WAR文件
• 简化Maven配置
• 自动配置Spring
• 提供生产就绪型功能，如指标，健康检查和外部配置
• 绝对没有代码生成并且对XML也没有配置要求

v搭建Spring Boot

1. 生成模板

可以在官网https://start.spring.io/生成spring boot的模板。如下图

然后用idea导入生成的模板,导入有疑问的可以看我另外一篇文章

2. 创建Controller

3. 运行项目

添加注解 @ComponentScan(注解详情点这里) 然后运行

在看到"Compilation completed successfully in 3s 676ms"消息之后，打开任意浏览器，输入 http://localhost:8080/index 即可查看效果，如下图

4. 接入mybatis

MyBatis 是一款优秀的持久层框架，它支持定制化 SQL、存储过程以及高级映射。

在项目对象模型pom.xml中插入mybatis的配置

<dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.1.1</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.30</version>
        </dependency>

创建数据库以及user表

use zuche;
CREATE TABLE `users` (
    `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
    `username` varchar(255) NOT NULL,
    `age` int(10) NOT NULL,
    `phone` bigint NOT NULL,
    `email` varchar(255) NOT NULL,
    PRIMARY KEY (`id`)
)ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
insert into users values(1,'赵',23,158,'[e-mail]');
insert into users values(2,'钱',27,136,'[e-mail]');
insert into users values(3,'孙',31,159,'[e-mail]');
insert into users values(4,'李',35,130,'[e-mail]'

分别创建三个包，分别是dao/pojo/service, 目录如下

添加User：

package com.athm.pojo;

/**
 * Created by toutou on 2018/9/15.
 */
public class User {
    private int id;
    private String username;
    private Integer age;
    private Integer phone;
    private String email;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Integer getPhone() {
        return phone;
    }

    public void setPhone(Integer phone) {
        this.phone = phone;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }
}

View Code

添加UserMapper：

package com.athm.dao;

import com.athm.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;

import java.util.List;

/**
 * Created by toutou on 2018/9/15.
 */
@Mapper
public interface UserMapper {
    @Select("SELECT id,username,age,phone,email FROM USERS WHERE AGE=#{age}")
    List<User> getUser(int age);
}

View Code

添加UserService：

package com.athm.service;

import com.athm.pojo.User;

import java.util.List;

/**
 * Created by toutou on 2018/9/15.
 */
public interface UserService {
    List<User> getUser(int age);
}

View Code

添加UserServiceImpl

package com.athm.service;

import com.athm.dao.UserMapper;
import com.athm.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * Created by toutou on 2018/9/15.
 */
@Service
public class UserServiceImpl implements UserService{
    @Autowired
    UserMapper userMapper;

    @Override
    public List<User> getUser(int age){
        return userMapper.getUser(age);
    }
}

View Code

controller添加API方法

package com.athm.controller;

import com.athm.pojo.User;
import com.athm.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Created by toutou on 2018/9/15.
 */
@RestController
public class IndexController {
    @Autowired
    UserService userService;
    @GetMapping("/show")
    public List<User> getUser(int age){
        return userService.getUser(age);
    }

    @RequestMapping("/index")
    public Map<String, String> Index(){
        Map map = new HashMap<String, String>();
        map.put("北京","北方城市");
        map.put("深圳","南方城市");
        return map;
    }
}

View Code

修改租车ZucheApplication

package com.athm.zuche;

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

@SpringBootApplication
@ComponentScan(basePackages = {"com.athm.controller","com.athm.service"})
@MapperScan(basePackages = {"com.athm.dao"})
public class ZucheApplication {

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

View Code

添加数据库连接相关配置，application.properties

spring.datasource.url=jdbc:mysql://localhost:3306/zuche
spring.datasource.username=toutou
spring.datasource.password=*******
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

按如下提示运行

浏览器输入得到效果：

vgithub地址

https://github.com/toutouge/javademo/tree/master/zuche_test/zuche

v博客总结

作　　者：请叫我头头哥
出　　处：http://www.cnblogs.com/toutou/
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