快速創建一個SpringBoot項目並整合Mybatis

2019-09-15

一、Maven環境搭建

　　1.導入jar坐標

<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>
    <!-- 父起步依賴 -->
    <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起步依賴 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.1.8.RELEASE</version>
        </dependency>
        <!-- 熱部署依賴 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
        <!-- 自動根據屬性內容提示配置文件的書寫依賴 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
        </dependency>
        <!-- 導入關聯mybatis坐標依賴 -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.0</version>
        </dependency>
        <!-- 導入mysql坐標依賴 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
    </dependencies>
    <build>
        <finalName>Panda_Maven_SpringBoot</finalName>
    </build>
</project>

　　2.創建入口類

package com.panda.controller;

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

/**
 * @author Jpanda
 */
//springboot入口類
@SpringBootApplication
//掃描mappers包
@MapperScan("com.panda.mappers")
public class SpringBootApplicationConfig {
    // 程序入口
    public static void main(String[] args) {
        // run:運行入口類,參數即為入口類的字節碼對象
        SpringApplication.run(SpringBootApplicationConfig.class);
    }
}

　   3.創建bean類

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.創建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.創建User對應數據庫表(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.配置數據庫連接,關系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.創建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.訪問測試