SpringBoot实现分页功能

本文实例为大家分享了springboot实现分页功能的具体代码，供大家参考，具体内容如下

新建demo\src\main\java\com\example\demo\mapper\usermapper.java

package com.example.demo.mapper;

import com.example.demo.entity.user;
import org.apache.ibatis.annotations.mapper;

import java.util.list;

mapper
public interface usermapper {

    public list<user> finduserbyname(string username);

    public list<user> listuser();
    public list<user> querypage(integer startrows);
    public int getrowcount();
    public int insertuser(user user);
    public int delete(int userid);
    public int update(user user);
}

新建demo\src\main\resources\mapper\usermapper.xml

<?xml version = "1.0" encoding = "utf-8"?>
<!doctype mapper public
        "-//mybatis.org//dtd com.example.mapper 3.0//en"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.demo.mapper.usermapper">

    <resultmap id="result" type="com.example.demo.entity.user">
        <result property="userid" column="userid" />
  <result property="userdate" column="userdate" />
        <result property="username" column="username" />
        <result property="useraddress" column="useraddress"/>
    </resultmap>

    <select id="listuser" resultmap="result">
  select * from user
 </select>

    <select id="finduserbyname" resultmap="result" parametertype="string">
  select * from user
   where username like concat(concat('%',#{username}),'%')
   order by userid desc
 </select>

 <select id="querypage" resultmap="result"  parametertype="integer">
  select * from user
   order by userid desc
   limit #{startrows},5
 </select>

 <select id="getrowcount" resulttype="integer">
  select count(*) from user
 </select>

    <insert id="insertuser" parametertype="com.example.demo.entity.user">
  insert into user
  (
  userid,userdate,username,useraddress
  )
  values (
  #{userid},
  #{userdate, jdbctype=varchar},
  #{username, jdbctype=varchar},
  #{useraddress, jdbctype=varchar}
  )
 </insert>

    <delete id="delete" parametertype="int">
  delete from user where userid=#{userid}
 </delete>

    <update id="update" parametertype="com.example.demo.entity.user">
  update user
   set user.userdate=#{userdate},user.username=#{username},user.useraddress=#{useraddress}
   where user.userid=#{userid}
 </update>
</mapper>

新建demo\src\main\java\com\example\demo\service\userservice.java

package com.example.demo.service;

import com.example.demo.entity.user;
import com.example.demo.mapper.usermapper;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.stereotype.service;

import java.util.list;


service
public class userservice {

    @autowired
    private usermapper usermapper;

    public list<user> findbyname(string username) {
        return usermapper.finduserbyname(username);
    }

    public list<user> querypage(integer startrows) {
        return usermapper.querypage(startrows);
    }

    public int getrowcount() {
        return usermapper.getrowcount();
    }

    public user insertuser(user user) {
        usermapper.insertuser(user);
        return user;
    }

    public list<user> listuser(){
        return usermapper.listuser();
    }

    public int update(user user){
        return usermapper.update(user);
    }

    public int delete(int userid){
        return usermapper.delete(userid);
    }

}

新建demo\src\main\java\com\example\demo\controller\userctrl.java

package com.example.demo.controller;

import com.example.demo.entity.user;
import com.example.demo.service.userservice;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.web.bind.annotation.*;

import java.util.list;

restcontroller
public class userctrl {

    @autowired
    private userservice userservice;

    @requestmapping(value = "/delete", method = requestmethod.post)
    public integer delete(integer userid) {
        system.out.println(userid);
        int result = userservice.delete(userid);
        return result;
    }

    @requestmapping(value = "/update", method = requestmethod.post)
    @responsebody
    public string update(user user) {
        int result = userservice.update(user);
        if (result >= 1) {
            return "修改成功";
        } else {
            return "修改失败";
        }

    }

    @requestmapping(value = "/insert", method = requestmethod.post)
    public user insert(user user) {
        return userservice.insertuser(user);
    }

    @requestmapping("/listuser")
    @responsebody
    public list<user> listuser() {
        return userservice.listuser();
    }

    @requestmapping("/listbyname")
    @responsebody
    public list<user> listuserbyname(string username) {
        return userservice.findbyname(username);
    }

    /**
     * 分页
     * @return
     */
    @requestmapping(value="/page")
    @responsebody
    public list<user> page(integer page){
        int pagenow = page == null ? 1 : page;
        int pagesize = 5;
        int startrows = pagesize*(pagenow-1);
        list<user> list = userservice.querypage(startrows);
        return list;
    }

    /**
     * rows
     * @return
     */
    @requestmapping(value="/rows")
    @responsebody
    public int rows(){
        return userservice.getrowcount();
    }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。