极简Springboot+Mybatis-Plus+Vue零基础萌新都看得懂的分页查询(富含前后端项目案例)

springboot配置相关

依赖配置

yaml配置

MySQL创建与使用

（可拿软件包+项目系统）

创建数据库

创建数据表

mybatis-plus相关

Mapper配置

编辑

启动类放MapperScan

启动类中配置

添加config配置文件

Springboot编码

实体类

mapperc(Dao)层

Service层

Sevice接口

Controller层

vue相关

界面展现

代码展现

解决跨域问题

config包中添加一个跨域请求允许

springboot配置相关

依赖配置

    <dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jdbc</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.5.7</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.33</version></dependency></dependencies>

yaml配置

spring:datasource:driver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://localhost:3306/你的数据库名字?useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=UTC&allowPublicKeyRetrieval=trueusername: 你的数据库账号password: 你的数据库密码mybatis-plus:configuration:#这个配置会将执行的sql打印出来，在开发或测试的时候可以用log-impl: org.apache.ibatis.logging.stdout.StdOutImplcall-setters-on-nulls: trueglobal-config:db-config:logic-delete-value: 1logic-not-delete-value: 0id-type: auto #ID自增

MySQL创建与使用

（可拿软件包+项目系统）

用 Navicat软件那些数据库软件(公棕号 wmcode 自取) 随便搞个数据表

我这里就以日记系统(需要可以点进去看看)为例吧、

创建数据库

创建数据表

这里插个题外话，就是数据库有数据删除部分之后索引还是递增的解决方法

MySQL | 恢复数据表内的索引为初始值1（有兴趣点击查看）

mybatis-plus相关

（可以去官网复制也行）

MyBatis-Plus 🚀 为简化开发而生

Mapper配置

继承Mybatis-Plus的接口

启动类放MapperScan

复制Mapper文件夹路径

启动类中配置

添加config配置文件

创建一个config包并创建类名任意，这里以官网给的为例

@Configuration//这里启动类有的话 就不用写了 完全可以删了
@MapperScan("scan.your.mapper.package") public class MybatisPlusConfig {@Beanpublic MybatisPlusInterceptor mybatisPlusInterceptor() {MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();// 这里一定要选好数据库类型interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));return interceptor;}
}

Springboot编码

实体类

package com.diarysytem.entity;import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;@Data
@NoArgsConstructor
@AllArgsConstructor
@ToString
@TableName("diary")
public class Diary {@TableField(value = "diary_pid")private Integer tasksPid;@TableField(value = "diary_title")private String diaryTitle;@TableField(value = "diary_content")private String diaryContent;@TableField(value = "diary_mood")private double diaryMood;@TableField(value = "diary_body")private double diaryBody;@TableField(value = "diary_time")private String diaryTime;@TableField(value = "diary_delete")private int diaryDelete;}

mapperc(Dao)层

package com.diarysytem.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.diarysytem.entity.Diary;
import org.apache.ibatis.annotations.Mapper;@Mapper
public interface DiaryMapper extends BaseMapper<Diary> {
}

Service层

package com.diarysytem.service;import com.diarysytem.entity.Diary;public interface DiaryService {public boolean userInsertDiary(Diary diary);
}

Sevice接口

package com.diarysytem.service.Impl;import com.diarysytem.entity.Diary;
import com.diarysytem.mapper.DiaryMapper;
import com.diarysytem.service.DiaryService;
import lombok.AllArgsConstructor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;@Service
public class DiaryServiceImpl implements DiaryService {private DiaryMapper diaryMapper;@Autowiredpublic DiaryServiceImpl(DiaryMapper diaryMapper) {this.diaryMapper = diaryMapper;}@Overridepublic boolean userInsertDiary(Diary diary) {return diaryMapper.insert(diary) > 0;}
}

Controller层

package com.diarysytem.controller;import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.diarysytem.entity.Diary;
import com.diarysytem.entity.WebDiary;
import com.diarysytem.mapper.DiaryMapper;
import com.diarysytem.service.DiaryService;
import lombok.AllArgsConstructor;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;@RestController
@AllArgsConstructor
public class DirayController {private DiaryMapper diaryMapper;private DiaryService diaryService;// 写入日记@PostMapping("write")public Boolean userWriteDiary(@RequestBody WebDiary webDiary){Diary tempDiary = new Diary();tempDiary.setTasksPid(null);tempDiary.setDiaryTitle(webDiary.getDiaryTitle());tempDiary.setDiaryContent(webDiary.getDiaryContent());tempDiary.setDiaryMood(webDiary.getDiaryMood());tempDiary.setDiaryBody(webDiary.getDiaryBody());tempDiary.setDiaryTime(webDiary.getDiaryTime());tempDiary.setDiaryDelete(0);return diaryService.userInsertDiary(tempDiary);}//分页查询（这里方便演示就直接注入 service 了）@GetMapping("fpage")public Page<Diary> fenPages(int current,int size){Page<Diary> page = new Page<>(current,size);return diaryMapper.selectPage(page, null);}}

vue相关

以我项目为例有需要了解下面自取

Springboot+vue自制可爱英语日记系统

界面展现

代码展现

<script>
import dayjs from 'dayjs';
import axios from 'axios';export default {data() {return {userDiaryList: [],currentPage: 1, // 当前页面totalPages: 0, // 总页面pageSize: 3 // 每个页面的数量};},created() {axios.get('http://127.0.0.1:8887/fpage', {params: {current: this.currentPage, // 页数 = sum / sizesize: this.pageSize //每页显示多少条}}).then(res => {console.log(res.data);const { records, pages, current } = res.data;this.userDiaryList = records;this.totalPages = pages;this.currentPage = current;});},methods: {getUpPage(){this.currentPage--;axios.get('http://127.0.0.1:8887/fpage', {params: {current: this.currentPage, // 页数 = sum / sizesize: this.pageSize //每页显示多少条}}).then(res => {console.log(res.data);const { records, pages, current } = res.data;this.userDiaryList = records;this.totalPages = pages;this.currentPage = current;});},getNextPage(){this.currentPage++;axios.get('http://127.0.0.1:8887/fpage', {params: {current: this.currentPage, // 页数 = sum / sizesize: this.pageSize //每页显示多少条}}).then(res => {console.log(res.data);const { records, pages, current } = res.data;this.userDiaryList = records;this.totalPages = pages;this.currentPage = current;});},userDiaryListClick(index){console.log(index);this.currentPage = index;axios.get('http://127.0.0.1:8887/fpage', {params: {current: this.currentPage, // 页数 = sum / sizesize: this.pageSize //每页显示多少条}}).then(res => {console.log(res.data);const { records, pages, current } = res.data;this.userDiaryList = records;this.totalPages = pages;this.currentPage = current;});},TImeZhuanHuan(time){try {console.log(time)const date = dayjs(time);if (!date.isValid()) {throw new Error('Invalid timestamp');}return this.formattedDate = date.format('YYYY-MM-DD HH:mm:ss');} catch (error) {console.error('Error formatting timestamp:', error);return this.formattedDate = 'Invalid timestamp';}}}
}
</script><template><div><main class="read"><h1 class="am_r_top_1 h1s">Search for diary<span class="pagsNumber">({{this.currentPage}}/{{ this.totalPages }})</span></h1><div class="search am_r_1"><span>Search</span><input type="text" placeholder="Search for diary" class="search_input"></div><div class="userDiaryItems"><div class="userDiaryList am_r_5" v-for="(item, index) in userDiaryList" :key="index"><div class="userDiaryList_left"><span class="userDiaryList_left_number">No.{{ item.tasksPid }}</span><h2>{{ item.diaryTitle }}</h2><span class="userDiaryList_left_time"><span>{{ TImeZhuanHuan(item.diaryTime) }}</span>   <span class="userStatusImg"><img  src="/public/xiai.png" alt=""> {{ item.diaryMood}}</span><span class="userStatusImg"><img  src="/public/tizhizhishu.png" alt="">  {{ item.diaryBody }}</span></span></div><div class="userDiaryList_right"><span>browse</span><span>------</span><span>delete</span></div></div></div></main><!-- 分页导航 --><div class="pages am_r_3"><button @click="getUpPage" class="buts">上一页</button><el-scrollbar style="width: 80%;padding: 10px 0;"><ul class="scrollbar-flex-content"><li v-for="index in totalPages" :key="index" class="scrollbar-demo-item" @click="userDiaryListClick(index)">{{index}}</li></ul></el-scrollbar><button @click="getNextPage" class="buts">下一页</button></div></div></template><style scoped>
.userStatusImg{padding: 0 10px;
}
.userStatusImg img{margin: 0 0 -2px 0;width: 20px;
}
.pagsNumber{padding: 0 10px;font-size: 22px;
}
.pages{display: flex;justify-content: space-evenly;align-items: center;}
.buts{border-radius: 10px;padding: 10px 5px;border: 0;background-color: rgb(248, 189, 144);color: #fff;}
.buts:hover{cursor: pointer;background-color: rgb(254, 133, 40);}.scrollbar-flex-content {padding: 15px 0;display: flex;
}
.scrollbar-demo-item {padding: 5px 15px;display: flex;align-items: center;justify-content: center;margin: 0 5px;text-align: center;border-radius: 4px;font-size: 18px;color: rgb(159, 100, 32);background-color: rgb(255, 233, 209);}
.scrollbar-demo-item:hover{cursor: pointer;background-color: rgb(255, 220, 183);}.userDiaryItems{height: 50vh;
}.pagination a{text-decoration: none;font-weight: bold;font-size: 18px;color: rgb(212, 147, 77);}
.userDiaryList{display: flex;justify-content: space-between;padding: 10px 10px 10px 10px;border-radius: 10px;margin: 10px 0;align-items: center;background-color: rgb(255, 233, 209);
}.userDiaryList_left_number{font-size: 18px;font-weight: bold;color: rgb(204, 175, 141);
}
.userDiaryList_left h2{overflow: hidden;padding: 10px 0 0px 10px;font-size: 25px;font-weight: bold;color: rgb(159, 100, 32);
}.userDiaryList_left_time{display: flex;padding: 5px 0 10px 10px;font-size: 18px;color: rgb(204, 175, 141);
}
.userDiaryList_right{display: flex;flex-direction: column;justify-content: center;align-items: center;
}
.userDiaryList_right span{font-size: 18px;font-weight: bold;color: rgb(204, 175, 141);
}
.search{display: flex;padding: 10px 10px 10px 10px;border-radius: 10px;margin: 10px 0;align-items: center;background-color: rgb(255, 233, 209);
}
.search span{display: flex;justify-content: center;align-items: center;width: 15%;padding: 10px 0;margin: 0 5px 0 0;border-radius: 10px;font-weight: bold;font-size: 25px;color: rgb(255, 255, 255);background-color: rgb(254, 133, 40);box-shadow: 0 3px 10px rgba(201, 102, 27, 0.525);}
.search input{width: 85%;border-radius: 10px;border: 0;padding: 15px;outline: none;font-size: 18px;font-weight: bold;color: rgb(121, 91, 33);}
</style>

解决跨域问题

我前端是localhost:8888,后端是127.0.0.1:8887

我直接在后端进行跨域操作了

config包中添加一个跨域请求允许

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;@Configuration
public class WebConfig implements WebMvcConfigurer {@Overridepublic void addCorsMappings(CorsRegistry registry) {registry.addMapping("/**").allowedOrigins("http://localhost:8888").allowedMethods("GET", "POST", "PUT", "DELETE").allowedHeaders("*").allowCredentials(true);}
}

(到底啦)