SpringBoot+Mybatis整合实例

前言

大家都知道springboot有几大特点；能创建独立的Spring应用程序；能嵌入Tomcat，无需部署WAR文件；简化Maven配置；自动配置Spring等等。这里整合mybatis，创建一个简单的springboot实例。

创建一个springboot项目

• 按照以下步骤进行
  
  
  
  
  
  

• 注意：此处只选择web
  
  
  
  

• 这时，我们的项目就创建完成了，先测试一下
  
  

• 找到启动类，运行
  
  
  
  

• 地址栏查看
  
  

• 我们也可以通过window命令窗口启动
  
  

整合mybatis

看一下文件的目录结构以及作用

文件内容

maven依赖(pom.xml)

<?xml version="1.0" encoding="UTF-8"?>
<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>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.9.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.example</groupId>
	<artifactId>nikeo</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>BootWeb</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<version.spring>4.3.14.RELEASE</version.spring>
		<version.jackson>2.6.5</version.jackson>
		<java.version>1.8</java.version>
		<shiro.version>1.4.0</shiro.version>
		<skiptests>true</skiptests>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-thymeleaf</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-jdbc</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>

		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis-spring</artifactId>
			<version>1.2.2</version>
		</dependency>
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis</artifactId>
			<version>3.2.8</version>
		</dependency>

		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.3.1</version>
		</dependency>

		<dependency>
			<groupId>org.apache.tomcat</groupId>
			<artifactId>tomcat-jdbc</artifactId>
		</dependency>

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.14</version>
		</dependency>

	</dependencies>

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

	<repositories>
		<repository>
			<id>spring-milestone</id>
			<url>https://repo.spring.io/libs-release</url>
		</repository>
	</repositories>

	<pluginRepositories>
		<pluginRepository>
			<id>spring-milestone</id>
			<url>https://repo.spring.io/libs-release</url>
		</pluginRepository>
	</pluginRepositories>

</project>

核心配置文件（application.properties）也可以命名成yml格式（application.yml）

server.port=8088

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/sys?useUnicode=true&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

spring.datasource.minIdle=5
spring.datasource.maxActive=20
spring.datasource.maxWait=60000
spring.datasource.timeBetweenEvictionRunsMillis=60000
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
spring.datasource.useGlobalDataSourceStat=true

spring.mvc.view.prefix=classpath:/templates/
spring.mvc.view.suffix=.html

spring.thymeleaf.mode=HTML5
spring.thymeleaf.encoding=UTF-8
spring.thymeleaf.content-type=text/html
spring.thymeleaf.cache=false

spring.thymeleaf.prefix = classpath:/static/
spring.thymeleaf.suffix = .html

配置文件(mybatis-config.xml)

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!-- 全局参数 -->
    <settings>
        <!-- 使全局的映射器启用或禁用缓存-->
        <setting name="cacheEnabled" value="true"/>
        <!-- 是否可以使用列的别名 (取决于驱动的兼容性) default:true -->
        <setting name="useColumnLabel" value="true"/>
        <!-- 使用驼峰命名法转换字段-->
        <setting name="mapUnderscoreToCamelCase" value="true"/>

        <setting name="callSettersOnNulls" value="true"/>

        <setting name="defaultStatementTimeout" value="25000" />

    </settings>

</configuration>

Controller类

package com.example.nikeo.controller;

import com.example.nikeo.entity.Student;
import com.example.nikeo.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

/**
 * Created by nikeodong on 2018/8/24.
 */
@RestController
public class StudentController {

    @Autowired
    private StudentService studentService;

    @RequestMapping("/list")
    public ResponseEntity<?> list(){
        List<Student> student = studentService.list();
        return ResponseEntity.ok(student);
    }
}

Service类

package com.example.nikeo.service;

import com.example.nikeo.entity.Student;
import com.example.nikeo.mapper.StudentMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * Created by nikeodong on 2018/8/24
 */
@Service
public class StudentService {

    @Autowired
    StudentMapper studentMapper;

    public List<Student> list(){
        return studentMapper.list();
    }
}

映射类

package com.example.nikeo.mapper;

import com.example.nikeo.entity.Student;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
 * Created by nikeodong on 2018/8/24
 */
@Repository
public interface StudentMapper {
    List<Student> list();
}

映射文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.2//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >

<mapper namespace="com.example.nikeo.mapper.StudentMapper">
    <select id="list" resultType="Student">
        SELECT * FROM student;
    </select>
</mapper>

实体类

package com.example.nikeo.entity;

/**
 * Created by nikeodong on 2018/8/24
 */
public class Student {

    private Integer id;
    private String name;
    private String address;
    private Integer age;

    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 String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public Integer getAge() {
        return age;
    }

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

调整心跳类

package com.example.nikeo;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;

import javax.sql.DataSource;

@MapperScan(basePackages = {"com.example.nikeo.mapper"})
@SpringBootApplication
@EnableAutoConfiguration
@ComponentScan
public class BootWebApplication {

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

	@Bean
	@ConfigurationProperties(prefix="spring.datasource")
	public DataSource dataSource() {
		return new org.apache.tomcat.jdbc.pool.DataSource();
	}

	@Bean
	public SqlSessionFactory sqlSessionFactoryBean() throws Exception {
		SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
		sqlSessionFactoryBean.setConfigLocation(new ClassPathResource("config/mybatis-config.xml"));
		sqlSessionFactoryBean.setTypeAliasesPackage("com.example.nikeo.entity");
		sqlSessionFactoryBean.setDataSource(dataSource());
		PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
		sqlSessionFactoryBean.setMapperLocations(resolver.getResources("classpath:/mybatis/*.xml"));
		return sqlSessionFactoryBean.getObject();
	}

	@Bean
	public PlatformTransactionManager transactionManager() {
		return new DataSourceTransactionManager(dataSource());
	}

}

测试