SpringBoot Demo入门与Mybatis整合

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主题词：使用Spring boot搭建JavaWeb项目

• SpringBoot依赖的JDK版本为1.8及以上

SpringBoot Demo入门

1、File->new,选择maven，创建一个空项目，直接next


2、pom文件中添加依赖

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.9.RELEASE</version>
</parent>

<!-- spring boot相关包 -->
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter</artifactId>
</dependency>

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-test</artifactId>
  <scope>test</scope>
</dependency>

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-web</artifactId>
</dependency>

build插件

<plugins>
  <plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
  </plugin>
</plugins>

3、在com.yitong报下创建SpringMain.java

package com.yitong;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * Author:
 * Desc: spring boot 入口
 * DateTime:2017-12-13 14:06
 */
@SpringBootApplication
public class SpringMain {
    public static void main(String[] args) {
        SpringApplication.run(SpringMain.class, args);
    }
}

4、在com.yitong.controller报下创建DemoController.java

package com.yitong.controller;

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

/**
 * Author:
 * DateTime:2017-12-13 14:08
 */
@RestController
public class DemoController {

    @RequestMapping("/helloWorld")
    public String helloWorld() {
        return "This is a helloWorld";
    }
}

5、在SpringMain.java中启动springboot-demo，Run SpringMain


6、在浏览器中访问：
http://localhost:8080/helloWorld

7、项目文件结构总览

SpringBoot整合Mybatis

1、pom.xml添加依赖

<!-- 添加mysql驱动依赖 -->
<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>5.1.29</version>
</dependency>
<dependency>
  <groupId>org.mybatis.spring.boot</groupId>
  <artifactId>mybatis-spring-boot-starter</artifactId>
  <version>1.3.1</version>
</dependency>

2、创建com.yitong.bean.User.java

package com.yitong.bean;

public class User {
    public Integer userId;
    public Integer age;
    public String name;

    public Integer getUserId() {
        return userId;
    }

    public void setUserId(Integer userId) {
        this.userId = userId;
    }

    public Integer getAge() {
        return age;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return "User{" +
                "userId=" + userId +
                ", age=" + age +
                ", name='" + name + '\'' +
                '}';
    }
}

3、创建com.yitong.mapper.UserMapper.java

package com.yitong.mapper;

import com.yitong.bean.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

/**
 * Author:
 * DateTime:2017-12-13 16:30
 */
@Mapper
public interface UserMapper {
    @Select("SELECT * FROM USER WHERE userId = #{userId}")
    User getByUserId(@Param("userId") int userId);
}

4、在resources报下创建application.properties,spring约定名称必须为application

spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/dbcp?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull
spring.datasource.username=root
spring.datasource.password=****

5、在创建com.yitong.SpringBootMybatisApplication.java，其中userMapper报错可以忽略

package com.yitong;

import com.yitong.bean.User;
import com.yitong.mapper.UserMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * Author:
 * DateTime:2017-12-13 16:34
 */
@SpringBootApplication
public class SpringBootMybatisApplication implements CommandLineRunner {

    @Autowired
    private UserMapper userMapper;

    private Logger logger = LoggerFactory.getLogger(SpringBootMybatisApplication.class);

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

    @Override
    public void run(String... args) throws Exception {
        User user = this.userMapper.getByUserId(6);
        logger.info("user" + user);
    }
}

6、运行SpringBootMybatisApplication

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