SpringBoot Mybatis PageHelper 集成

1. 创建maven项目 springbootdemo

2. 配置pom.xml,导入jar包

<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<java.version>1.8</java.version>
		<mybatis_spring_boot.version>1.3.2</mybatis_spring_boot.version>
	</properties>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.4.0.RELEASE</version>
	</parent>
	<dependencies>
	    <!-- 添加 web 应用的依赖 -->
		<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>${mybatis_spring_boot.version}</version>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>
		<!-- 分页插件 -->
		<dependency>
			<groupId>com.github.pagehelper</groupId>
			<artifactId>pagehelper-spring-boot-starter</artifactId>
			<version>1.1.2</version>
		</dependency>
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>fastjson</artifactId>
			<version>1.2.31</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<!-- alibaba的druid数据库连接池 -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid-spring-boot-starter</artifactId>
			<version>1.1.1</version>
		</dependency>
        <!-- 热部署 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
			<optional>true</optional>
		</dependency>
		<!-- 日志 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-thymeleaf</artifactId>
		</dependency>
	</dependencies>
	<build>
		<!-- 将应用打包成一个可以运行的 jar -->
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<configuration>
					<source>${java.version}</source>
					<target>${java.version}</target>
				</configuration>
			</plugin>
		</plugins>
	</build>

3. 配置application.properties 文件

logging.level.cn.mrdear.mapper=trace

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/my_db?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&failOverReadOnly=false
spring.datasource.username=root
spring.datasource.password=123456

spring.datasource.max-active=20      
spring.datasource.max-idle=8  
spring.datasource.min-idle=8  
spring.datasource.initial-size=10

mybatis.typeAliasesPackage=com.demo.model
mybatis.mapperLocations=classpath:com/demo/dao/mapper/*.xml

pagehelper.helperDialect=mysql
pagehelper.reasonable=true
pagehelper.supportMethodsArguments=true
pagehelper.params=count=countSql

server.port=11111

spring.devtools.restart.exclude=static/**,public/**

4. 创建 Appplication 启动类

@SpringBootApplication
@MapperScan(basePackages = { "com.demo.dao" })
public class Application {
	public static void main(String[] args) {
		SpringApplication.run(Application.class, args);
	}
}

5. 创建实体类 User.java

public class User {
	private Integer id;
	private String username;
	private String password;
//setter and getter 自行补全
}

6. 创建 dao 层

（1）创建UserDao 接口

public List<User> selectByPage();

（2）创建 UserMapper.xml

<?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.demo.dao.UserDao">
	<resultMap id="BaseResultMap" type="com.demo.model.User">
		<result column="id" jdbcType="INTEGER" property="id" />
		<result column="username" jdbcType="VARCHAR" property="username" />
		<result column="password" jdbcType="VARCHAR" property="password" />
	</resultMap>
	<select id="selectByPage"
		resultType="com.demo.model.User">
		select
		<include refid="Base_Column_List" />
		from user
	</select>

	<sql id="Base_Column_List">
		id, username, password
	</sql>
</mapper>

7. 创建 service层

（1）创建service 接口

public List<User> selectByPage(int pageNo, int pageSize);

（2）实现service接口

@Service("userService")
public class UserServiceImpl implements UserService {

	@Autowired
	private UserDao userDao;

	@Override
	public List<User> selectByPage(int pageNo, int pageSize) {
		PageHelper.startPage(pageNo, pageSize);
		return userDao.selectByPage();
	}
}

8. 创建 Controller 层

@RestController
@RequestMapping("user")
public class UserController {

	private static Logger logger = LoggerFactory.getLogger(UserController.class);
	@Autowired
	private UserService userService;

	@RequestMapping("selectByPage")
	public ModelMap selectByPage(Integer page, Integer rows) {
		logger.info("/user/selectByPage开始调用！");
		ModelMap model = new ModelMap();
		try {
			List<User> userList = userService.selectByPage(page, rows);
			// 获取分页查询后的数据
			PageInfo<User> pageInfo = new PageInfo<User>(userList);
			model.put("data", userList);
			// 总记录数
			model.put("total", pageInfo.getTotal());
			// 当前页
			model.put("page", pageInfo.getPageNum());
		} catch (Exception e) {
			logger.info("/user/selectByPage出现异常！！！");
		}
		return model;
	}
}

9. 在 resources 目录下 创建 static 目录，用于存放静态资源

10. 运行项目，测试