SpringBoot+Mybatis-plus+mysql做一个简单的分页查询

SpringBoot+Mybatis-plus+mysql做一个简单的分页查询

pom.xml添加的代码

 
            mysql
            mysql-connector-java
            runtime
        
        
            org.projectlombok
            lombok
            true
        
        
        
            com.baomidou
            mybatis-plus-boot-starter
            3.1.0
        
        
        
            com.alibaba
            druid
            1.1.6
        
        
            org.apache.velocity
            velocity-engine-core
            2.0
        

application.properties文件代码

server.port=8080

server.context-path=/

server.tomcat.uri-encoding=UTF-8

spring.mvc.view.prefix=/WEB-INF/views/

spring.mvc.view.suffix=.jsp

spring.datasource.url=jdbc:mysql://localhost:3306/example?characterEncoding=UTF-8&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=zl19990510
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

config文件夹下添加的所需要的分页类

import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@EnableTransactionManagement
@Configuration
@MapperScan("com.example.demo.mapper")
public class MybatisPlusConfig {

    @Bean
    public PaginationInterceptor paginationInterceptor() {
        return new PaginationInterceptor();
    }
}

实体类book

package com.example.demo.pojo;

import lombok.Data;

@Data
public class book {

    private Integer id;
    private String name;
    private String author;
    private Double price;

    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 getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public Double getPrice() {
        return price;
    }

    public void setPrice(Double price) {
        this.price = price;
    }

    @Override
    public String toString() {
        return "book{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", author='" + author + '\'' +
                ", price=" + price +
                '}';
    }
}

mapper

package com.example.demo.mapper;


import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.example.demo.pojo.book;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;

import java.io.Serializable;
import java.util.Collection;

@Repository
@Mapper
public interface bookMybaticPlus extends BaseMapper {

}

service文件下

package com.example.demo.service;

import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.IService;
import com.example.demo.pojo.book;


public interface MybaticService extends IService {
    public IPage selectPage(long page, long size);
}

package com.example.demo.service;

import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.demo.mapper.bookMybaticPlus;
import com.example.demo.pojo.book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;


@Service
@Transactional
public class MybaticServiceImpl extends ServiceImpl implements MybaticService {
    @Autowired
    bookMybaticPlus bookMybaticPlus;

    @Override
    public IPage selectPage(long page, long size) {
        IPage iPage = bookMybaticPlus.selectPage(new Page<>(page, size), null);
        return iPage;
    }
}

controller文件下：

package com.example.demo.controller;


import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.example.demo.pojo.book;
import com.example.demo.service.MybaticService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.List;

@Controller
public class MybaticPlusController {

    @Autowired
    MybaticService MybaticService;

    @ResponseBody
    @RequestMapping(value="/findAll/{page}/{size}", produces = "application/json;charset=utf-8")   /*格式：/findAll/1/5;1为页数，5为每页条数*/
    public List getAll(@PathVariable("page") Integer page, @PathVariable("size") Integer size){
        //需要在Config配置类中配置分页插件
        IPage Page = new Page<>();

        //每页条数
        Page = MybaticService.selectPage(page,size);
        System.out.println("------page------");
        System.out.println(Page.getRecords());
        System.out.println("------page------");
        return Page.getRecords();
    }

}

如控制台出现乱码：pom.xml文件需要加入：
 

                org.springframework.boot
                spring-boot-maven-plugin
                
                    true
                    
                    -Dfile.encoding=UTF-8