SpringBoot带mybatis小试牛刀

第一步首先配置pom.xml文件

<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/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>Ming</groupId>
  <artifactId>SpringBoot</artifactId>
  <version>0.0.1-SNAPSHOT</version>

   <!-- Spring Boot 启动父依赖 -->
  <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>1.5.4.RELEASE</version>
  </parent>

  <properties>
      <mybatis-spring-boot>1.2.0</mybatis-spring-boot>
      <mysql-connector>5.1.39</mysql-connector>
      <druid>1.0.18</druid>
      <java.version>1.8</java.version>
  </properties>

  <dependencies>

       <!-- Spring Boot Web 依赖 -->
       <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-web</artifactId>
       </dependency>

       <!-- Spring Boot Mybatis 依赖 -->
       <dependency>
           <groupId>org.mybatis.spring.boot</groupId>
           <artifactId>mybatis-spring-boot-starter</artifactId>
           <version>1.1.1</version>
       </dependency>

       <!-- MySQL 连接驱动依赖 -->
       <dependency>
           <groupId>mysql</groupId>
           <artifactId>mysql-connector-java</artifactId>
           <version>${mysql-connector}</version>
       </dependency>

       <!-- Druid 数据连接池依赖 -->
       <dependency>
           <groupId>com.alibaba</groupId>
           <artifactId>druid</artifactId>
           <version>${druid}</version>
       </dependency>

       <!-- 分页插件 -->  
       <dependency>  
           <groupId>com.github.pagehelper</groupId>  
           <artifactId>pagehelper</artifactId>  
           <version>4.1.6</version>  
       </dependency>  

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

</project>

第二步：在src/main/resources目录下新建一个application.yml文件

#配置端口号
server:
  port: 8080

logging:
  level: 
    learning: trace

spring:
  #数据源配置
  datasource:
    url: jdbc:mysql://localhost:3306/test
    username: root
    password: root
    driver-class-name: com.mysql.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource
    connectionProperties: druid.stat.mergeSql=true
  #模板引擎
  freemarker:
    #关闭缓存
    cache: false
    request-context-attribute: request
    #模板加载的位置
    template-loader-path: classpath:/templates
    #前缀
    suffix: .htm
    #后缀
    prefix: /htm/

mybatis:
  #实体类所做包
  type-aliases-package: learning.model
  #mapper.xml所在位置
  mapper-locations: classpath:mappers/*.xml

第三步：配置类的编写，在conf包下新建一个MybatisConfig类以配置使用PageHelper分页

@Configuration
public class MybatisConfig {
    @Bean
    public PageHelper pageHelper(){
        PageHelper pageHelper = new PageHelper();  
        //添加配置，也可指定文件路径
        Properties p = new Properties();
        p.setProperty("offsetAsPageNum", "true");
        p.setProperty("rowBoundsWithCount", "true");
        p.setProperty("reasonable", "true");
        pageHelper.setProperties(p);
        return pageHelper;
    }
}

第四步：实例类的编写

public class Player {
    private Integer id;
    private String name;
    private Double points;
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Double getPoints() {
        return points;
    }
    public void setPoints(Double points) {
        this.points = points;
    }
}

第五步：dao接口的编写

public interface PlayerDao {
    void save (Player player);

    Player findByKey(Integer id);

    List<Player> findAll();
}

第六步：service接口的编写

public interface PlayerService {
    void add(Player player);

    List<Player> getAll();
}

第七步：service接口的实现类进行实现类的编写

@Service
public class PlayerServiceImpl implements PlayerService{

    @Autowired
    private PlayerDao playerDao;

    @Override
    public void add(Player player) {
        playerDao.save(player);
    }

    @Override
    public List<Player> getAll() {
        PageHelper.startPage(1, 2);
        return playerDao.findAll();
    }

}

第八步：在src/main/resources 下新建一个包mapppers用来存放mybatis的xml文件

<?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="learning.mapper.PlayerDao">
    <insert id="save">
        INSERT INTO player (name,points) VALUES (#{name},#{points})
    </insert>   

    <select id="findByKey" resultType="learning.model.Player">
        SELECT * FROM player WHERE id = #{id}
    </select>

    <select id="findAll" resultType="learning.model.Player">
        SELECT * FROM player
    </select>   
</mapper>

第九步：在src/main/resources在新建一个目录templates用来存放freemarker加载的模板 

第十步：controller层代码的编写

@Controller
@RequestMapping("/Test")
public class TestController {
    @Autowired
    private PlayerService playerService;

    @RequestMapping("/getAll")
    @ResponseBody
    public Object getAll(){
        Player player = new Player();
        player.setName("张三丰");
        player.setPoints(15.6);
        player.setId(3);
        return player;              
    }

    @RequestMapping("/all")
    @ResponseBody
    public Object get(){
        return playerService.getAll();
    }

    @RequestMapping("/add")
    public String add(Player player){
        playerService.add(player);
        return "test/hello";
    }

    @RequestMapping("/hello")
    public String hello(Model model) {
        List<Player> list = playerService.getAll();
        model.addAttribute("list",list);
        return "test/hello";
    }