SpringBoot与Mybatis整合

项目完整图

首先pom

<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.pwl</groupId>
	<artifactId>SpringBoot-01</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>SpringBoot-01 Maven Webapp</name>
	<url>http://maven.apache.org</url>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.1.RELEASE</version>
	</parent>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.3.1</version>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid</artifactId>
			<version>1.0.5</version>
		</dependency>
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>fastjson</artifactId>
			<version>1.2.38</version>
		</dependency>
	</dependencies>
	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

创建application.properties

# mybatis
mybatis.type-aliases-package=com.pwl.springboot.dao
mybatis.configuration.map-underscore-to-camel-case=true
mybatis.configuration.default-fetch-size=100
mybatis.configuration.default-statement-timeout=3000
mybatis.mapperLocations = classpath:com/pwl/springboot/dao/*.xml
# druid
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/springboot?useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true&useSSL=false
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.filters=stat
spring.datasource.maxActive=2
spring.datasource.initialSize=1
spring.datasource.maxWait=60000
spring.datasource.minIdle=1
spring.datasource.timeBetweenEvictionRunsMillis=60000
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=select 'x'
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
spring.datasource.poolPreparedStatements=true
spring.datasource.maxOpenPreparedStatements=20

在com.pwl.springboot.entity包下创建User实体

package com.pwl.springboot.entity;

public class User {
	private int id;
	private String name;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	@Override
	public String toString() {
		return "User [id=" + id + ", name=" + name + "]";
	}
	
}

创建com.pwl.springboot.dao包并创建UserDao接口

UserDao.java

package com.pwl.springboot.dao;

import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

import com.pwl.springboot.entity.User;

@Mapper
public interface UserDao {
	
	@Select("select * from User where id=#{id}")
	public User select(@Param("id")int id);
}

依次创建service

创建com.pwl.springboot.service包并创建接口

UserService.java接口

package com.pwl.springboot.service;

import com.pwl.springboot.entity.User;

public interface UserService {
	
	public User selectUser(int id);
}

实现类

创建com.pwl.springboot.service.impl包并创建UserServiceImpl实现类

UserServiceImpl.java

package com.pwl.springboot.service.impl;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import com.pwl.springboot.dao.UserDao;
import com.pwl.springboot.entity.User;
import com.pwl.springboot.service.UserService;

@Service
public class UserServiceImpl implements UserService{
	@Resource
	private UserDao userDao;
	
	@Override
	public User selectUser(int id) {
		return userDao.select(id);
	}

}

然后创建UserController.java

package com.pwl.springboot.controller;

import javax.annotation.Resource;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.alibaba.fastjson.JSON;
import com.pwl.springboot.entity.User;
import com.pwl.springboot.service.UserService;

@Controller
@RequestMapping("/")
public class UserController {
	@Resource
	private UserService userService;
	@RequestMapping("getUser")
	@ResponseBody
	public String getUser(int id) {
		User user = userService.selectUser(id);
		return JSON.toJSONString(user);
	}
}

在创建com.pwl.springboot包并创建springboot启动类

package com.pwl.springboot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

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

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