SpringBoot整合mybatis-pagehelper实现分页

1. 引入分页插件依赖

        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.3</version>
        </dependency>

2. 配置yml

# 分页插件配置
pagehelper:
 helperDialect: mysql
 supportMethodsArguments: true

 

 

3.分页数据封装到PagedGridResult类

package com.qing.springbootmould.utils;

import com.github.pagehelper.PageInfo;

import java.util.List;

/**
 * 
 * @Title: PagedGridResult.java
 * @Package com.imooc.utils
 * @Description: 用来返回分页Grid的数据格式
 * Copyright: Copyright (c) 2019
 */
public class PagedGridResult {
    
    private int page;            // 当前页数
    private int total;            // 总页数    
    private long records;        // 总记录数
    private List<?> rows;        // 每行显示的内容

    public int getPage() {
        return page;
    }
    public void setPage(int page) {
        this.page = page;
    }
    public int getTotal() {
        return total;
    }
    public void setTotal(int total) {
        this.total = total;
    }
    public long getRecords() {
        return records;
    }
    public void setRecords(long records) {
        this.records = records;
    }
    public List<?> getRows() {
        return rows;
    }
    public void setRows(List<?> rows) {
        this.rows = rows;
    }

　　//分页数据进行封装到PagedGridResult类，传给前端
    public static PagedGridResult setterPagedGrid(List<?> list, Integer page) {
        PageInfo<?> pageList = new PageInfo<>(list);
        PagedGridResult grid = new PagedGridResult();
        grid.setPage(page);
        grid.setRows(list);
        grid.setTotal(pageList.getPages());
        grid.setRecords(pageList.getTotal());
        return grid;
    }

}

4. 分页的使用

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.qing.springbootmould.dao.UserMapper">

    <!--查询全部用户-->
    <select id="findAll" resultType="com.qing.springbootmould.pojo.User">
          select * from user
    </select>

</mapper>

dao层

package com.qing.springbootmould.dao;

import com.qing.springbootmould.pojo.User;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper
public interface UserMapper {

    User findUser(Integer id);

    List<User> findAll();
}

service层，在这进行分页

UserService 接口

public interface UserService {

    //分页接口
    PagedGridResult findAll(Integer page, Integer pageSize);
}

UserServiceImpl 实现类

package com.qing.springbootmould.service.impl;

import com.github.pagehelper.PageHelper;
import com.qing.springbootmould.dao.UserMapper;
import com.qing.springbootmould.pojo.User;
import com.qing.springbootmould.service.UserService;
import com.qing.springbootmould.utils.PagedGridResult;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;

    @Override
    public PagedGridResult findAll(Integer page, Integer pageSize) {
        /**
         * page: 第几页
         * pageSize: 每页显示条数
         */
        PageHelper.startPage(page, pageSize);
        // PageHelper.startPage(page, pageSize)方法必须放在业务查询的上方
        List<User> userList = userMapper.findAll();
        PagedGridResult pagedGridResult = PagedGridResult.setterPagedGrid(userList, page);
        return pagedGridResult;
    }
}

 TestController类

package com.qing.springbootmould.controller;

import com.qing.springbootmould.pojo.Result;
import com.qing.springbootmould.pojo.User;
import com.qing.springbootmould.service.UserService;
import com.qing.springbootmould.utils.PagedGridResult;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import springfox.documentation.annotations.ApiIgnore;
import sun.awt.SunHints;

import java.util.List;
import java.util.Map;

@RestController
public class TestController {

    @Autowired
    private UserService userService;

    // http://localhost:8080/query3?page=1&pageSize=2
    @GetMapping("/query3")
    public Result findUser3(@RequestParam(name="page") Integer page,
                            @RequestParam(name="pageSize") Integer pageSize){
        PagedGridResult gridResult = userService.findAll(page,pageSize);
        return Result.ok(gridResult);
    }
}

测试结果：