前后端分离项目–二手交易平台小程序
SpringBoot----物品收藏功能实现
SpringBoot----评论回复功能实现（数据库设计）
SpringBoot----文件(图片)上传与显示(下载)
点赞
这个功能耗费了我挺多时间，简单实现很简单，就++ – .但是还是感觉这种点赞是一个高频率的请求，而且搜的时候我看都是使用redis做缓存。b站也搜到一个视频来着，也是一样的。
效果：
功能:
首先还是一个先发请求返回数据，但是先数据存到了redis中，然后使用springboot定时任务每隔一定时间将数据存到mysql中。这样可以防止redis挂掉之后数据丢失。
数据库设计：
MySQL使用了一张表和另外几张表的一个字段，一张存放点赞信息，就是谁点赞了谁在啥时候。字段存放点赞数量。就是物品信息表。评论表这些。
-
redis，使用的是hash数据结构，redis_liked存放点赞数据，redis_liked_count存放点赞数量数据。
解释 ：
对于 “1：：字符串：：1 ” 这个是一种存放方式，前面1为objid就是被点赞物品或者评论id，字符串为微信openid每个用户唯一id,后面1为类型区分点赞的是物品还是主评论，子评论。
对于 "\"0\"" 这个数据则是点赞的状态，1为点赞0为取消点赞对于"1::1"这个前面1是objid就是物品或者子、主评论id,后面则是区别是哪个类型。“0”就是点赞数量。
后台代码：
前端就发like或者取消unlike请求
package com.w.wx.controller;
import com.w.wx.domain.Msg;
import com.w.wx.service.impls.RedisServiceImpl;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@Slf4j
@RestController
@RequestMapping("/wx/liked")
public class LikedContro {
@Autowired
private RedisServiceImpl redisService;
@RequestMapping("like")
public Msg saveLikedToRedis(Integer objId,String openid , String type){
redisService.incrementLikedCount(objId, type, openid);
redisService.saveLikedToRedis(objId,openid,type);
int oneInfoCount = redisService.getOneInfoCount(objId, type);
return Msg.success().add("count",oneInfoCount);
}
@RequestMapping("unlike")
public Msg decrementLikedCount(Integer objId,String openid,String type){
redisService.decrementLikedCount(objId,type,openid);
redisService.unlikeFromRedis(objId,openid,type);
int oneInfoCount = redisService.getOneInfoCount(objId, type);
return Msg.success().add("count",oneInfoCount);
}
//恢复redis
@RequestMapping("restore")
public Msg restoreRedisCountInfo(){
redisService.savaInfoFromDb2Re(0);
redisService.savaInfoFromDb2Re(1);
redisService.savaInfoFromDb2Re(2);
return Msg.success();
}
}操作redis代码
package com.w.wx.service.impls;
import com.w.wx.mapper.LikedMapper;
import com.w.wx.domain.Liked;
import com.w.wx.service.ImagesService;
import com.w.wx.service.RedisService;
import com.w.wx.utils.RedisKeyUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.Cursor;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ScanOptions;
import org.springframework.stereotype.Service;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
@Service
@Slf4j
public class RedisServiceImpl implements RedisService {
@Autowired
private RedisTemplate redisTemplate;
@Autowired
private LikedServiceImpl likedService;
@Autowired
private ImagesService imagesService;
@Override
public void saveLikedToRedis(Integer objId, String openid,String type) {
imagesService.addLikedNotice(objId, openid,type);
String likedKey = RedisKeyUtils.getLikedKey("" + objId, openid,type);
redisTemplate.opsForHash().put(RedisKeyUtils.MAP_KEY_USER_LIKED,likedKey, "1");
}
@Override
public void unlikeFromRedis(Integer objId, String openid,String type) {
String likedKey = RedisKeyUtils.getLikedKey("" + objId, openid,type);
redisTemplate.opsForHash().put(RedisKeyUtils.MAP_KEY_USER_LIKED,likedKey, "0");
}
@Override
public void deleteFromRedis(Integer objId, String openid,String type) {
String key = RedisKeyUtils.getLikedKey("" + objId, openid,type);
redisTemplate.opsForHash().delete(RedisKeyUtils.MAP_KEY_USER_LIKED, key);
}
@Override
public Long incrementLikedCount(Integer objId,String type, String openid) {
String key = RedisKeyUtils.getLikedKey("" + objId,type);
String likedKey = RedisKeyUtils.getLikedKey("" + objId, openid,type);
//根据定时器时长有延迟
// if(likedMapper.selectByObjIdAndOpenid(objId,openid,Integer.valueOf(type)).getLikeStatus()==0){
// redisTemplate.opsForHash().increment(RedisKeyUtils.MAP_KEY_USER_LIKED_COUNT, key, 1);
// }
//防止重复点赞
if("0".equals(redisTemplate.opsForHash().get(RedisKeyUtils.MAP_KEY_USER_LIKED,likedKey))
|| redisTemplate.opsForHash().get(RedisKeyUtils.MAP_KEY_USER_LIKED,likedKey) == null){
return redisTemplate.opsForHash().increment(RedisKeyUtils.MAP_KEY_USER_LIKED_COUNT, key, 1);
}
return null;
}
@Override
public void decrementLikedCount(Integer objId,String type, String openid) {
String key = RedisKeyUtils.getLikedKey("" + objId,type);
String likedKey = RedisKeyUtils.getLikedKey("" + objId, openid,type);
// if(likedMapper.selectByObjIdAndOpenid(objId,openid,Integer.valueOf(type)).getLikeStatus()==1){
// redisTemplate.opsForHash().increment(RedisKeyUtils.MAP_KEY_USER_LIKED_COUNT, key, -1);
// }
if("1".equals(redisTemplate.opsForHash().get(RedisKeyUtils.MAP_KEY_USER_LIKED,likedKey))){
redisTemplate.opsForHash().increment(RedisKeyUtils.MAP_KEY_USER_LIKED_COUNT, key, -1);
}
}
@Override
public List<Liked> getLikedDataFromRedis() {
Cursor<Map.Entry<Object, Object>> cursor = redisTemplate.opsForHash().scan(RedisKeyUtils.MAP_KEY_USER_LIKED, ScanOptions.NONE);
List<Liked> list = new ArrayList<>();
while (cursor.hasNext()){
Map.Entry<Object, Object> entry = cursor.next();
String key = (String) entry.getKey();
String[] split = key.split("::");
int status = Integer.parseInt((String) entry.getValue());
Liked like = new Liked();
like.setObjId(Integer.valueOf(split[0]));
like.setUserOpenid(split[1]);
like.setType(Integer.valueOf(split[2]));
like.setLikeStatus(status);
list.add(like);
//存到 list 后从 Redis 中删除
// redisTemplate.opsForHash().delete(RedisKeyUtils.MAP_KEY_USER_LIKED, key);
}
return list;
}
//获取redis中点赞数量
@Override
public Cursor<Map.Entry<Object, Object>> getLikedCountFromRedis() {
Cursor<Map.Entry<Object, Object>> cursor = redisTemplate.opsForHash().scan(RedisKeyUtils.MAP_KEY_USER_LIKED_COUNT, ScanOptions.NONE);
//redisTemplate.opsForHash().delete(RedisKeyUtils.MAP_KEY_USER_LIKED_COUNT);
return cursor;
}
@Override
public int getOneInfoCount(Integer objId, String type) {
String key = RedisKeyUtils.getLikedKey("" + objId,type);
return (int)redisTemplate.opsForHash().get(RedisKeyUtils.MAP_KEY_USER_LIKED_COUNT,key);
}
public void saveCountInfo(Integer objId,Integer type,Integer count){
String key = RedisKeyUtils.getLikedKey("" + objId,""+type);
redisTemplate.opsForHash().put(RedisKeyUtils.MAP_KEY_USER_LIKED_COUNT,key,count);
}
//redis挂掉后通过mysql中数据恢复redis
@Override
public void savaInfoFromDb2Re(Integer type) {
List<Map<String,Object>> likeds = likedService.selectLikedInfoByType(type);
if (likeds.isEmpty()||likeds.equals("")){
return;
}
Iterator<Map<String,Object>> it = likeds.listIterator();
while(it.hasNext()){
Map<String,Object> map = it.next();
Integer objId = (Integer) map.get("objId");
Integer count = Integer.parseInt(map.get("num_liked").toString());
log.info("objId:"+objId+"count:"+count+"type:"+type);
saveCountInfo(objId,type,count);
}
}
}操作mysql代码
package com.w.wx.service.impls;
import com.w.wx.mapper.CommentsInfoMapper;
import com.w.wx.mapper.CommentsReplyMapper;
import com.w.wx.mapper.GoodsMapper;
import com.w.wx.mapper.LikedMapper;
import com.w.wx.domain.CommentsInfo;
import com.w.wx.domain.Liked;
import com.w.wx.service.LikedService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.Cursor;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import java.sql.Timestamp;
import java.util.*;
@Service
@Slf4j
public class LikedServiceImpl implements LikedService {
@Autowired
private RedisServiceImpl redisService;
@Autowired
private LikedMapper likedMapper;
@Autowired
private CommentsInfoMapper commentsInfoMapper;
@Autowired
private CommentsReplyMapper commentsReplyMapper;
@Autowired
private GoodsMapper goodsMapper;
@Override
@Transactional
public void transLikedFromRedisToDB() {
List<Liked> likeds = redisService.getLikedDataFromRedis();
for (Liked like : likeds) {
Date date = new Date();
Timestamp timestamp = new Timestamp(date.getTime());
//首先判断之前是否有
Liked liked = likedMapper.selectByObjIdAndOpenid(like.getObjId(),like.getUserOpenid(),like.getType());
if(liked==null ){
//没有则新增
like.setCreateTime(timestamp);
likedMapper.insert(like);
}else{
//有则更新
likedMapper.updateByPrimaryKey(liked.getLikeId(),like.getLikeStatus(),timestamp);
}
}
}
@Override
@Transactional
public void transLikedCountFromRedisToDB() {
Cursor<Map.Entry<Object, Object>> cursor = redisService.getLikedCountFromRedis();
while (cursor.hasNext()){
Map.Entry<Object, Object> map = cursor.next();
String key = (String)map.getKey();
//分离出objId和type
String[] split = key.split("::");
int type =Integer.parseInt(split[1]);
int objId = Integer.parseInt(split[0]);
int likeNum = (Integer) map.getValue();
if ( type == 1){
//为主评论
commentsInfoMapper.updateByPrimaryKey(objId,likeNum);
}else if(type == 2){
//为子评论
commentsReplyMapper.updateByPrimaryKey(objId,likeNum);
}else{
//为物品
goodsMapper.updateGoodsLikeSum(objId,likeNum);
}
}
}
@Override
public List<Map<String,Object>> selectLikedInfoByType(Integer type) {
return likedMapper.selectLikedInfoByType(type);
}
}工具类
package com.w.wx.utils;
public class RedisKeyUtils {
//保存用户点赞数据的key
public static final String MAP_KEY_USER_LIKED = "redis_liked";
//保存用户被点赞数量的key
public static final String MAP_KEY_USER_LIKED_COUNT = "redis_liked_count";
public static String getLikedKey(String likedUserId, String likedPostId,String type){
StringBuilder builder = new StringBuilder();
builder.append(likedUserId);
builder.append("::");
builder.append(likedPostId);
builder.append("::");
builder.append(type);
return builder.toString();
}
public static String getLikedKey(String likedUserId,String type){
StringBuilder builder = new StringBuilder();
builder.append(likedUserId);
builder.append("::");
builder.append(type);
return builder.toString();
}
}定时任务配置类
package com.w.wx.config;
import com.w.wx.utils.LikeTask;
import org.quartz.*;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class QuartzConfig {
private static final String LIKE_TASK_IDENTITY = "LikeTaskQuartz";
@Bean
public JobDetail quartzDetail(){
return JobBuilder.newJob(LikeTask.class).withIdentity(LIKE_TASK_IDENTITY).storeDurably().build();
}
@Bean
public Trigger quartzTrigger(){
SimpleScheduleBuilder scheduleBuilder = SimpleScheduleBuilder.simpleSchedule()
// .withIntervalInSeconds(5) //设置时间周期单位秒
.withIntervalInHours(2) //两个小时执行一次
.repeatForever();
return TriggerBuilder.newTrigger().forJob(quartzDetail())
.withIdentity(LIKE_TASK_IDENTITY)
.withSchedule(scheduleBuilder)
.build();
}
}定时任务工具类
package com.w.wx.utils;
import com.w.wx.service.LikedService;
import com.w.wx.service.impls.LikedServiceImpl;
import lombok.extern.slf4j.Slf4j;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.quartz.QuartzJobBean;
import java.text.SimpleDateFormat;
import java.util.Date;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
@Slf4j
@Component
public class LikeTask extends QuartzJobBean {
@Autowired
LikedServiceImpl likedService;
private SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
@Override
protected void executeInternal(JobExecutionContext jobExecutionContext) throws JobExecutionException {
log.info("LikeTask-------- {}", sdf.format(new Date()));
//将 Redis 里的点赞信息同步到数据库里
likedService.transLikedFromRedisToDB();
likedService.transLikedCountFromRedisToDB();
}
}
参考：
springboot如何实现点赞功能
点赞功能的实现及Springboot定时器的应用
还有好多，第一页搜出来的基本都看过，第一次搞真心不会。。。
f12去看看csdn点赞，会发现点文章的赞会有点赞量的返回。点评论的赞就没
哔哩哔哩就看不懂了！！！
到此这篇关于SpringBoot物品点赞功能实现的文章就介绍到这了,更多相关SpringBoot点赞内容请搜索编程网以前的文章或继续浏览下面的相关文章希望大家以后多多支持编程网！
