原创文章，欢迎转载。转载请注明：转载自IT人故事会，谢谢！
原文链接地址：「小程序JAVA实战」小程序的视频点赞功能开发（62）

视频点赞关系有3张表，用户表（获得点赞数量），视频表（获得点赞数量），用户喜欢视频的关联表，需要同时操作三张表。源码：https://github.com/limingios/wxProgram.git 中No.15和springboot

后台开发

• mapper.xml开发

VideosUserMapper.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.idig8.mapper.VideosUsersMapper" >
  <resultMap id="BaseResultMap" type="com.idig8.pojo.vo.VideosVO" >
    <!--
      WARNING - @mbg.generated
    -->
    <id column="id" property="id" jdbcType="VARCHAR" />
    <result column="user_id" property="userId" jdbcType="VARCHAR" />
    <result column="audio_id" property="audioId" jdbcType="VARCHAR" />
    <result column="video_desc" property="videoDesc" jdbcType="VARCHAR" />
    <result column="video_path" property="videoPath" jdbcType="VARCHAR" />
    <result column="video_seconds" property="videoSeconds" jdbcType="REAL" />
    <result column="video_width" property="videoWidth" jdbcType="INTEGER" />
    <result column="video_height" property="videoHeight" jdbcType="INTEGER" />
    <result column="cover_path" property="coverPath" jdbcType="VARCHAR" />
    <result column="like_counts" property="likeCounts" jdbcType="BIGINT" />
    <result column="status" property="status" jdbcType="INTEGER" />
    <result column="create_time" property="createTime" jdbcType="TIMESTAMP" />
    <result column="username" property="username" jdbcType="VARCHAR" />
    <result column="face_image" property="faceImage" jdbcType="VARCHAR" />
    <result column="nickname" property="nickname" jdbcType="VARCHAR" />
  </resultMap>
  
  <select id="queryAllVideos" resultMap="BaseResultMap" parameterType="String">
    select v.*,u.face_image,u.username,u.nickname from videos v
    left join users u on v.user_id = u.id
    where 
        1 = 1
        <if test="videoDesc !=null  and videoDesc != '' ">
            and v.video_desc like '%${videoDesc}%'
        </if>
        and v.status = 1
    order by v.create_time
    
  </select>
  
  
  <update id="addVideoLikeCount" parameterType="String">
    update videos set like_counts=like_counts+1 where id=#{videoId}
  </update>
  
   <update id="reduceVideoLikeCount" parameterType="String">
    update videos set like_counts=like_counts-1 where id=#{videoId}
  </update>
</mapper>

UsersMapper.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.idig8.mapper.UsersMapper" >
  <resultMap id="BaseResultMap" type="com.idig8.pojo.Users" >
    <!--
      WARNING - @mbg.generated
    -->
    <id column="id" property="id" jdbcType="VARCHAR" />
    <result column="username" property="username" jdbcType="VARCHAR" />
    <result column="password" property="password" jdbcType="VARCHAR" />
    <result column="face_image" property="faceImage" jdbcType="VARCHAR" />
    <result column="nickname" property="nickname" jdbcType="VARCHAR" />
    <result column="fans_counts" property="fansCounts" jdbcType="INTEGER" />
    <result column="follow_counts" property="followCounts" jdbcType="INTEGER" />
    <result column="receive_like_counts" property="receiveLikeCounts" jdbcType="INTEGER" />
  </resultMap>
  
  <update id="addReceiveLikeCount" parameterType="String">
    update users set receive_like_counts = receive_like_counts+1 where id=#{userId}
  </update>
  
    <update id="reduceReceiveLikeCount" parameterType="String">
    update users set receive_like_counts = receive_like_counts-1 where id=#{userId}
  </update>
  
</mapper>

• service 和 serviceImpl

VideoService.java

package com.idig8.service;

import java.util.List;

import com.idig8.pojo.Videos;
import com.idig8.utils.PagedResult;

public interface VideoService {

    
    /**
     * 保存视频信息
     * @param Id
     * @return
     */
    public String saveVideo(Videos video);
    
    /**
     * 分析查询视频列表
     * @param video
     * @param isSaveRecord
     * @param page
     * @param pageSize
     * @return
     */
    public PagedResult getAllVideos(Videos video,Integer isSaveRecord,Integer page,Integer pageSize);
    
    /**
     * 获取热搜词列表
     * @return
     */
    public List<String> gethostList();
    
    public void userLikeVideo(String userId,String videoId,String videoCreaterId);
    
    public void userUnLikeVideo(String userId,String videoId,String videoCreaterId);
    
}

VideoServiceImpl.java

package com.idig8.service.Impl;

import java.util.List;

import org.n3r.idworker.Sid;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.idig8.mapper.SearchRecordsMapper;
import com.idig8.mapper.UsersLikeVideosMapper;
import com.idig8.mapper.UsersMapper;
import com.idig8.mapper.VideosMapper;
import com.idig8.mapper.VideosUsersMapper;
import com.idig8.pojo.SearchRecords;
import com.idig8.pojo.UsersLikeVideos;
import com.idig8.pojo.Videos;
import com.idig8.pojo.vo.VideosVO;
import com.idig8.service.VideoService;
import com.idig8.utils.PagedResult;

import tk.mybatis.mapper.entity.Example;
import tk.mybatis.mapper.entity.Example.Criteria;

@Service
public class VideoServiceImpl implements VideoService {

    @Autowired
    private VideosMapper videosMapper;

    @Autowired
    private UsersMapper usersMapper;

    @Autowired
    private VideosUsersMapper videosUsersMapper;

    @Autowired
    private SearchRecordsMapper searchRecordsMapper;

    @Autowired
    private UsersLikeVideosMapper usersLikeVideosMapper;

    @Autowired
    private Sid sid;

    @Transactional(propagation = Propagation.REQUIRED)
    public String saveVideo(Videos video) {
        String id = sid.nextShort();
        video.setId(id);

        videosMapper.insertSelective(video);
        return id;

    }

    @Override
    @Transactional(propagation = Propagation.REQUIRED)
    public PagedResult getAllVideos(Videos video, Integer isSaveRecord, Integer page, Integer pageSize) {

        String desc = video.getVideoDesc();
        if (isSaveRecord != null && isSaveRecord == 1) {
            SearchRecords record = new SearchRecords();
            String recordId = sid.nextShort();
            record.setId(recordId);
            record.setContent(desc);
            searchRecordsMapper.insert(record);
        }

        PageHelper.startPage(page, pageSize);
        List<VideosVO> list = videosUsersMapper.queryAllVideos(desc);
        PageInfo<VideosVO> pageList = new PageInfo<>(list);

        PagedResult result = new PagedResult();
        result.setPage(page);
        result.setTotal(pageList.getPages());
        result.setRows(list);
        result.setRecords(pageList.getTotal());

        return result;
    }

    @Transactional(propagation = Propagation.SUPPORTS)
    @Override
    public List<String> gethostList() {

        return searchRecordsMapper.gethotList();
    }

    @Override
    public void userLikeVideo(String userId, String videoId, String videoCreaterId) {

        // 1.保存用戶和视频的关联关系
        String likeId = sid.nextShort();
        UsersLikeVideos usersLikeVideos = new UsersLikeVideos();
        usersLikeVideos.setId(likeId);
        usersLikeVideos.setUserId(userId);
        usersLikeVideos.setVideoId(videoId);
        usersLikeVideosMapper.insert(usersLikeVideos);

        // 2.视频喜欢的累加
        videosUsersMapper.addVideoLikeCount(videoId);

        // 3. 用户喜欢的累加
        usersMapper.addReceiveLikeCount(userId);

    }

    @Override
    public void userUnLikeVideo(String userId, String videoId, String videoCreaterId) {
        Example example = new Example(UsersLikeVideos.class);
        Criteria criteria = example.createCriteria();
        criteria.andEqualTo("userId", userId);
        criteria.andEqualTo("videoId", videoId);
        usersLikeVideosMapper.deleteByExample(example);
        // 2.视频喜欢的累减
        videosUsersMapper.reduceVideoLikeCount(videoId);

        // 3. 用户喜欢的累减
        usersMapper.reduceReceiveLikeCount(userId);
    }
}

• mapper.java文件

UsersMapper.java

package com.idig8.mapper;

import com.idig8.pojo.Users;
import com.idig8.utils.MyMapper;

public interface UsersMapper extends MyMapper<Users> {

    public void addReceiveLikeCount(String userId);
    
    public void reduceReceiveLikeCount(String userId);

}

VideosUsersMapper.java

package com.idig8.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Param;

import com.idig8.pojo.Videos;
import com.idig8.pojo.vo.VideosVO;
import com.idig8.utils.MyMapper;

public interface VideosUsersMapper extends MyMapper<VideosVO> {
    
    public List<VideosVO> queryAllVideos(@Param("videoDesc") String videoDesc);
    
    public void addVideoLikeCount(String videoId);
    
    public void reduceVideoLikeCount(String videoId);
    
}

• controller.java

VideoController.java

package com.idig8.controller;

import java.io.File;
import java.util.Date;
import java.util.UUID;

import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import com.idig8.pojo.Bgm;
import com.idig8.pojo.Videos;
import com.idig8.service.BgmService;
import com.idig8.service.VideoService;
import com.idig8.utils.FetchVideoCover;
import com.idig8.utils.JSONResult;
import com.idig8.utils.MergeVideoMp3;
import com.idig8.utils.PagedResult;
import com.idig8.utils.enums.VideoStatusEnum;
import com.idig8.utils.file.FileUtil;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiImplicitParams;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiParam;


@RestController
@Api(value="视频相关业务的接口", tags= {"视频相关业务的controller"})
@RequestMapping("/video")
public class VideoController extends BasicController {
    
    @Autowired
    private BgmService bgmService;
    
    @Autowired
    private VideoService videosService;
    
    @Value("${server.file.path}")
    private String fileSpace;
    
    @Value("${server.ffmpeg.path}")
    private String ffmpegexe;
    
    
    @ApiOperation(value="上传视频", notes="上传视频的接口")
    @ApiImplicitParams({
        @ApiImplicitParam(name="userId", value="用户id", required=true, 
                dataType="String", paramType="form"),
        @ApiImplicitParam(name="bgmId", value="背景音乐id", required=false, 
                dataType="String", paramType="form"),
        @ApiImplicitParam(name="videoSeconds", value="背景音乐播放长度", required=true, 
                dataType="String", paramType="form"),
        @ApiImplicitParam(name="videoWidth", value="视频宽度", required=true, 
                dataType="String", paramType="form"),
        @ApiImplicitParam(name="videoHeight", value="视频高度", required=true, 
                dataType="String", paramType="form"),
        @ApiImplicitParam(name="desc", value="视频描述", required=false, 
                dataType="String", paramType="form")
    })
    @PostMapping(value="/upload", headers="content-type=multipart/form-data")
    public JSONResult upload(String userId, 
                String bgmId, double videoSeconds, 
                int videoWidth, int videoHeight,
                String desc,
                @ApiParam(value="短视频", required=true)
                MultipartFile file) throws Exception {
        
        if (StringUtils.isBlank(userId)) {
            return JSONResult.errorMsg("用户id不能为空...");
        }
        // 文件保存的命名空间
        String fileName = file.getOriginalFilename();
        // 保存到数据库中的相对路径
        String path = "";
        String videOutPath = "";
        String ImagePath = "";
        try {
             path = FileUtil.uploadFile(file.getBytes(), fileSpace, fileName);
            } catch (Exception e) {
                e.getStackTrace();
                   return JSONResult.errorMsg(e.getMessage());
            }                
         
    
        if(StringUtils.isNotBlank(bgmId)){
            Bgm bgm = bgmService.queryBgmById(bgmId);
            String mp3BgmPath = fileSpace + bgm.getPath();
            MergeVideoMp3 mergeVideoMp3 = new MergeVideoMp3(ffmpegexe);
            String videOutPathName = UUID.randomUUID().toString()+".mp4";
            File targetFile = new File(fileSpace + userId);
            if (!targetFile.exists()) {
                targetFile.mkdirs();
            }
            videOutPath = "/"+userId+"/"+videOutPathName;
            String videoInput = fileSpace +path;
            mergeVideoMp3.convertor(videoInput, mp3BgmPath, videoSeconds, fileSpace +videOutPath);
            
        }else{
            videOutPath = path;
            
        }
        
        ImagePath =  "/"+userId+"/"+UUID.randomUUID().toString()+".jpg";;
        FetchVideoCover fetchVideoCover = new FetchVideoCover(ffmpegexe);
        fetchVideoCover.getCover(fileSpace +videOutPath, fileSpace +ImagePath);
        
        
        Videos videos = new Videos();
        videos.setAudioId(bgmId);
        videos.setCreateTime(new Date());
        videos.setVideoDesc(desc);
        videos.setId(UUID.randomUUID().toString());
        videos.setUserId(userId);
        videos.setVideoHeight(videoHeight);
        videos.setVideoWidth(videoWidth);
        videos.setVideoPath(videOutPath);
        videos.setCoverPath(ImagePath);
        videos.setStatus(VideoStatusEnum.SUCCESS.value);
        videosService.saveVideo(videos);
                 
        return JSONResult.ok(path);
        
    }
    
    @PostMapping(value="/showAll")
    @ApiOperation(value="视频列表", notes="分页的视频列表")
    public JSONResult upload(@RequestBody Videos video,Integer isSaveRecord,
            Integer page) throws Exception {
        if(page == null){
            page = 1;
        }
        PagedResult result = videosService.getAllVideos(video,isSaveRecord,page, PAGE_SIZE);     
        return JSONResult.ok(result);
        
    }
    
    @PostMapping(value="/userLike")
    @ApiOperation(value="热搜词列表", notes="热搜词列表")
    public JSONResult userLike(String userId,String videoId,String videoCreaterId) throws Exception {
        
        videosService.userLikeVideo(userId, videoId, videoCreaterId);
        return JSONResult.ok();
        
    }
    
    @PostMapping(value="/userUnLike")
    public JSONResult userUnLike(String userId,String videoId,String videoCreaterId) throws Exception {
        videosService.userUnLikeVideo(userId, videoId, videoCreaterId);
        return JSONResult.ok();
        
    }
    
    @PostMapping(value="/hot")
    public JSONResult upload() throws Exception {
 
        return JSONResult.ok(videosService.gethostList());
        
    }
}

小程序前端修改

var videoUtils = require('../../utils/videoUtils.js')
const app = getApp()
Page({

  data: {
    cover:'cover',
    videoContext:"",
    videoInfo:{},
    videId:'',
    src:'',
    userLikeVideo:false
  },
  

  showSearch:function(){
    wx.navigateTo({
      url: '../videoSearch/videoSearch',
    })
  },
  onLoad:function(params){
    var me = this;
    me.videoContext = wx.createVideoContext('myVideo', me);
    var videoInfo = JSON.parse(params.videoInfo);
    var videoWidth = videoInfo.videoWidth;
    var videoHeight = videoInfo.videoHeight;
    var cover = 'cover';
    if (videoWidth > videoHeight){
      cover = '';
    }
    me.setData({
      videId: videoInfo.id,
      src: app.serverUrl + videoInfo.videoPath,
      videoInfo: videoInfo,
      cover: cover
    })


  },
  showIndex:function(){
    wx.redirectTo({
      url: '../index/index',
    })
  },

  onShow:function(){
    var me = this;
    me.videoContext.play();
  },
  onHide:function(){
    var me = this;
    me.videoContext.pause();
  },
  upload:function(){
 
    var me = this;
    var userInfo = app.getGlobalUserInfo();

    var videoInfo = JSON.stringify(me.data.videoInfo);
    var realUrl = '../videoInfo/videoInfo#videoInfo@' + videoInfo;

    if (userInfo.id == '' || userInfo.id == undefined) {
      wx.navigateTo({
        url: '../userLogin/userLogin?realUrl=' + realUrl,
      })
    } else {
      videoUtils.uploadVideo();
    }


  },
  showMine: function () {
    var me = this;
    var userInfo = app.getGlobalUserInfo();

    var videoInfo = JSON.parse

    if (userInfo.id == '' || userInfo.id == undefined){
      wx.navigateTo({
        url: '../userLogin/userLogin',
      })
    }else{
      wx.navigateTo({
        url: '../mine/mine',
      })
    }
    
   
  },

  likeVideoOrNot: function () {
    var me = this;
    var userInfo = app.getGlobalUserInfo();


    var videoInfoStr = JSON.stringify(me.data.videoInfo);
    var realUrl = '../videoInfo/videoInfo#videoInfo@' + videoInfoStr;
    if (userInfo.id == '' || userInfo.id == undefined) {
      wx.navigateTo({
        url: '../userLogin/userLogin?realUrl=' + realUrl,
      })
    } else {
      var videoInfo = me.data.videoInfo;
      var userLikeVideo = me.data.userLikeVideo;
      var url = "/video/userLike?userId=" + userInfo.id + "&videoId=" + videoInfo.id + "&videoCreaterId=" + userLikeVideo.userId;

      if (userLikeVideo){
        var url = "/video/userUnLike?userId=" + userInfo.id + "&videoId=" + videoInfo.id + "&videoCreaterId=" + userLikeVideo.userId;
      }
      wx.showLoading({
        title: '....',
      })
      wx.request({
        url: app.serverUrl + url,
        method: "POST",
        header: {
          'content-type': 'application/json', // 默认值
          'headerUserId': userInfo.id,
          'headerUserToken': userInfo.userToken
        },
        success: function (res) {
          wx.hideLoading();
          me.setData({
            userLikeVideo: !userLikeVideo,
          })
        }
      })

    }


  }
})

PS：许多的功能如果分解，逻辑清晰的话，剩下的都是搬砖活。