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