spring boot 集成mybatis实现分页功能的实例

1.导入依赖

在你pom.xml文件中添加如下集成

<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>com.ps</groupId>
	<artifactId>SPRING_BOOT_JSON</artifactId>
	<version>0.0.1-SNAPSHOT</version>

	<!-- 继承默认值为Spring Boot -->
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.17.RELEASE</version>
	</parent>
	<dependencies>
		<!-- 集成spring MVC -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<!-- 集成mysql -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>
		<!-- mysql驱动包 -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>
		<!-- 阿里巴巴druid数据库连接池 -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid-spring-boot-starter</artifactId>
			<version>1.1.10</version>
		</dependency>
		<!-- 开发工具：修改java代码无须重新运行 -->
		<dependency>	   
			<groupId>org.springframework.boot</groupId>    
			<artifactId>spring-boot-devtools</artifactId>    
			<optional>true</optional>
		</dependency>
		<!-- 分页插件 -->
		<dependency>
			<groupId>com.github.pagehelper</groupId>
			<artifactId>pagehelper</artifactId>
			<version>4.1.6</version>
		</dependency>
		<dependency>
			<groupId>commons-lang</groupId>
			<artifactId>commons-lang</artifactId>
			<version>2.2</version>
		</dependency>
		<!-- 集成mybatis -->
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.1.1</version>
		</dependency>

	</dependencies>
</project>

2.代码

2.1：在你的main方法里面加上如下配置：

import java.util.Properties;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;

import com.github.pagehelper.PageHelper;

@SpringBootApplication
public class Main {
	public static void main(String[] args) throws Exception {
        SpringApplication.run(Main.class, args);
    }
    
	//配置mybatis的分页插件pageHelper
	@Bean
	public PageHelper pageHelper() {
		PageHelper pageHelper = new PageHelper();
		Properties props = new Properties();
		props.setProperty("dialect", "mysql");
		// 表示支持从接口中读取pageNum和pageSize
		props.setProperty("supportMethodsArguments", "true");
		pageHelper.setProperties(props);
		return pageHelper;
	}
}

解释：@SpringBootApplication表示自动装配；
也可以将你的pageHelper配置写在带有@Configuration的类中，这种类可以理解为spring boot的配置类
注意：所有的类要写在main方法所在的类的包下，或者子包下，不然不能扫描；

2.2：创建一个数据库中表的实体类
          这个就不演示了，都是set，get方法

2.3：控制层

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import com.pk.entity.Result;
import com.pk.service.EmpService;


@RestController
public class EmpServlet{
    @Autowired
    private EmpService service;

    @GetMapping(value = "/emps")
    public List<?> emps(String checkName,String page, String limit ){
        Result result = null;
        try {
        	// 这里的checkName是指按名字查询，1是指：页数 ，2是指每页展示的数据
            result = service.queryEmps(checkName, "1", "2");
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return result.getData();
    }
}

2.4:Service层

import java.util.List;

import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.github.pagehelper.PageInfo;
import com.pk.entity.Result;
import com.pk.mapper.EmpMapper;
import com.pk.service.EmpService;
import com.pk.entity.Emp;

@Service
public class EmpServiceImpl implements EmpService {
	@Autowired
	private EmpMapper empMapper;

	public Result queryEmps(String checkName, String curPage, String pageNum) throws Exception {
		int curPageIn = Integer.parseInt(curPage);
		int pageNumIn = Integer.parseInt(pageNum);

		if(StringUtils.isEmpty(checkName)) {
			checkName = "";
		}else {
			curPageIn = 1;
		}
        List<Emp> queryEmps = empMapper.queryEmp("%"+checkName+"%", curPageIn, pageNumIn);
       
        PageInfo<Emp> pi = new PageInfo<Emp>(queryEmps );
       
        Result result = new Result();
		result.setCode(0);
		result.setCount((int) pi.getTotal());
		result.setData(queryEmps);
		return result;
	}

}

2.5:表映射类

import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import com.pk.entity.Emp;

@Mapper
public interface EmpMapper {
	@Select("select empno,ename,job,hiredate,sal from emp where ename like #{0}")
	public List<Emp> queryEmp(String checkName, @Param("pageNum")int startIndex, @Param("pageSize")int pageNumIn);
	
}

注意：
@Param(“pageNum”)和@Param(“pageSize”)是固定的，不能修改
通过@Mapper，直接在这里写sql语句

**2.6：**`application.properties`资源文件的内容

server.port=8081
spring.datasource.url=jdbc:mysql://localhost:3306/m1dn
spring.datasource.username=root
spring.datasource.password=ps123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.druid.stat-view-servlet.login-username=druid

3.访问