快速创建一个SpringBoot项目并整合Mybatis

2019-09-15

一、Maven环境搭建

　　1.导入jar坐标

 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

     <modelVersion>4.0.0</modelVersion>

     <groupId>com.panda</groupId>

     <artifactId>Panda_Maven_SpringBoot</artifactId>

     <packaging>war</packaging>

     <version>0.0.1-SNAPSHOT</version>

     <name>Panda_Maven_SpringBoot Maven Webapp</name>

     <url>http://maven.apache.org</url>

     <!-- 父起步依赖 -->

     <parent>

         <groupId>org.springframework.boot</groupId>

         <artifactId>spring-boot-starter-parent</artifactId>

         <version>2.0.1.RELEASE</version>

     </parent>

     <dependencies>

         <dependency>

         <groupId>junit</groupId>

         <artifactId>junit</artifactId>

         <version>3.8.1</version>

         <scope>test</scope>

         </dependency>

         <!-- web起步依赖 -->

         <dependency>

             <groupId>org.springframework.boot</groupId>

             <artifactId>spring-boot-starter-web</artifactId>

             <version>2.1.8.RELEASE</version>

         </dependency>

         <!-- 热部署依赖 -->

         <dependency>

             <groupId>org.springframework.boot</groupId>

             <artifactId>spring-boot-devtools</artifactId>

         </dependency>

         <!-- 自动根据属性内容提示配置文件的书写依赖 -->

         <dependency>

             <groupId>org.springframework.boot</groupId>

             <artifactId>spring-boot-configuration-processor</artifactId>

         </dependency>

         <!-- 导入关联mybatis坐标依赖 -->

         <dependency>

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

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

             <version>2.1.0</version>

         </dependency>

         <!-- 导入mysql坐标依赖 -->

         <dependency>

             <groupId>mysql</groupId>

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

         </dependency>

     </dependencies>

     <build>

         <finalName>Panda_Maven_SpringBoot</finalName>

     </build>

 </project>

　　2.创建入口类

 package com.panda.controller;

 import org.mybatis.spring.annotation.MapperScan;

 import org.springframework.boot.SpringApplication;

 import org.springframework.boot.autoconfigure.SpringBootApplication;

 /**

  * @author Jpanda

  */

 //springboot入口类

 @SpringBootApplication

 //扫描mappers包

 @MapperScan("com.panda.mappers")

 public class SpringBootApplicationConfig {

     // 程序入口

     public static void main(String[] args) {

         // run:运行入口类,参数即为入口类的字节码对象

         SpringApplication.run(SpringBootApplicationConfig.class);

     }

 }

　 3.创建bean类

 package com.panda.beans;

 /**

  * @author Jpanda

  */

 public class User {

     private Integer id;

     private String username;

     private String password;

     public Integer getId() {

         return id;

     }

     public void setId(Integer id) {

         this.id = id;

     }

     public String getUsername() {

         return username;

     }

     public void setUsername(String username) {

         this.username = username;

     }

     public String getPassword() {

         return password;

     }

     public void setPassword(String password) {

         this.password = password;

     }

     public User(Integer id, String username, String password) {

         super();

         this.id = id;

         this.username = username;

         this.password = password;

     }

     public User() {

         super();

     }

     @Override

     public String toString() {

         return "User [id=" + id + ", username=" + username + ", password=" + password + "]";

     }

 }

4.创建mapper接口

 package com.panda.mappers;

 import java.util.List;

 import org.apache.ibatis.annotations.Mapper;

 import com.panda.beans.User;

 /**

  * @author Jpanda

  */

 @Mapper

 public interface UserMapper {

     public List<User> getUsers();

 }

5.创建User对应数据库表(省略)

6.sql映射

 <?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.panda.mappers.UserMapper">

     <select id="getUsers" resultType="com.panda.beans.User">

         select * from user

     </select>

 </mapper>

　　7.配置数据库连接,关系springboot和mybatis

 #DB Configuration:

 spring.datasource.driverClassName=com.mysql.jdbc.Driver

 spring.datasource.url=jdbc:mysql://localhost:3307/user?useUnicode=true&characterEncoding=utf8

 spring.datasource.username=root

 spring.datasource.password=root

 #spring and mybatis

 #pojo alias package

 mybatis.type-aliases-package=com.panda.beans

 #upload mapperconfig files

 mybatis.mapper-locations=classpath:UserMapperConfig.xml

　　8.创建Controller

 package com.panda.controller;

 import java.util.List;

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

 import org.springframework.stereotype.Controller;

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

 import org.springframework.web.bind.annotation.ResponseBody;

 import com.panda.beans.User;

 import com.panda.mappers.UserMapper;

 /**

  * @author Jpanda

  */

 @Controller

 public class MybatisController {

     @Autowired

     private UserMapper userMapper;

     @RequestMapping("/mybatis")

     @ResponseBody

     public List<User> getUsers() {

         List<User> users = userMapper.getUsers();

         System.out.println(users);

         return users;

     }

 }

　　9.访问测试

巴特西

快速创建一个SpringBoot项目并整合Mybatis

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