微信小程序仿知乎实现评论留言功能

最近沉迷学习无法自拔，太久没有码字，码一个小程序留言功能实现。先上一波最后效果图：

（删除按钮，是用户自己的留言时才会显示该按钮）

实现技术

后台：SSM框架

数据库：MySQL数据库

数据库设计

评论功能的实现主要涉及三个表

comment：存储留言评论信息，表结构如下：

表中，必须的字段：id，user_id，reply_comment_id，comment，insert_time，source_id

添加了冗余字段username，reply_user_name，userphoto

主要用于存储微信名、回复的微信名、微信头像（这三个字段完全不应该冗余，当小程序用户更换用户名时，该表要跟着更新，可维护性差，不建议存储这些冗余信息，我就是懒得写SQL了）

source：存储你在小程序需要回复的内容。

user：存储小程序使用的用户信息，主要包括用户名、用户头像等微信用户信息。

小程序端

wxml

<scroll-view scroll-top="{{scrollTop}}" scroll-y="true" style="height:{{scrollHeight}}px;" class="list" bindscrolltolower="bindDownLoad" bindscrolltoupper="refresh">
 <view class="pro-con">
 <block wx:for="{{list}}" wx:key="{{index}}">
  <view class="pro-box">
  <view class="head">
   <image class="img" src="{{item.userPhoto}}" mode="aspectFit"></image>
   <view class="box">
   <view class="shead clear">
    <view class="names fl">{{item.userName}}
     <view wx:if="{{!item.replyUserName == \" \"}}">
     -> {{item.replyUserName}}
    </view>
    </view>
   </view>
   </view>
  </view>
  <view class="addr-info">
   <view class="addr-text">
   {{item.comment}}
   </view>
  </view>
  <view class="info">
   <view class="text">
   <text decode="true">{{item.insertTime}}</text>
   </view>
   <view class="text">
   <button class="sharebtn" data-commentId="{{item.id}}" data-commentUserName="{{item.userName}}" bindtap="bindReply">回复</button>
   </view>
    <view wx:if="{{item.userId == userId}}" class="status text fr">
    <text class="delete" decode="true" bindtap='deleteComment' data-CommentId="{{item.id}}">删除</text>
    </view>
  </view>
  </view>
 </block>
 </view>
</scroll-view>
<form bindsubmit="submitForm" report-submit="true">
 <view class="release">
 <view wx:if="{{reply}}" class="replyinfo1">
  回复<text class="text">{{replyUserName}}</text>
  <button class="cancel" bindtap="cancleReply">取消回复</button>
 </view>
 <view class="replyinfo2">
  <textarea placeholder-class="input_null" fixed="true" maxlength="-1" show-confirm-bar="false" cursor-spacing="15" auto-height="true" placeholder="请输入回复" name="comment"></textarea>
  <button form-type="submit" class="submit">发送</button>
 </view>
 </view>
</form>

css

.names {
 display: flex;
 font-size: 30rpx;
 line-height: 40rpx;
}

.input_null {
 color: #c9c9c9;
}

.replyAll {
 position:absolute;
}

.release {
 align-items: flex-end; /*底部对齐*/
 box-sizing: border-box;
 position: fixed;
 left: 0;
 bottom: 0;
 width: 100%;
 padding: 18rpx 0 18rpx 30rpx;
 background-color: #f7f8f7;
 font-size: 28rpx;
 z-index: 999;
}

.replyinfo1{
 display: flex;
 justify-content: space-between; /*两端对齐*/
 font-size: 35rpx;
}
.replyinfo2{
 display: flex;
 justify-content: space-between; /*两端对齐*/
}

.release textarea {
 width: 550rpx;
 min-height: 34rpx;
 max-height: 102rpx; /*最多显示三行*/
 border-width: 15rpx 20rpx; /*使用padding与预期留白不一致，故使用border*/
 border-style: solid;
 border-color: #fff;
 line-height: 34rpx;
 font-size: 28rpx;
 background-color: #fff;
 border-radius: 4rpx;
}

.release .text {
 font-size: 40rpx;
 color: #c9c9c9;
}

.cancel {
 width: 240rpx;
 height: 64rpx;
 line-height: 64rpx;
 text-align: center;
 color: #6c0;
 margin: 0 3px;
 padding: 0;
}

.release .submit {
 width: 120rpx;
 height: 64rpx;
 line-height: 64rpx;
 text-align: center;
 color: #6c0;
 margin: 0 3px;
 padding: 0;
}

.pro-box .info .text .delete {
 color: #f68135;
 border-radius: 50rpx;
 border: 1px solid #f68135;
 font-size: 28 rpx;
 width: 150rpx;
 height: 48rpx;
 text-align: center;
}

js

// pages/comment/comment.js
const model = require('../cityChoose/cityChoose.js')
const config = require('../../utils/config.js')
const util = require('../../utils/util.js')
const app = getApp()
var mydata = {
 end: 0,
 replyUserName: ""
}
Page({

 /**
 * 页面的初始数据
 */
 data: {
 list: [],
 },

 /**
 * 生命周期函数--监听页面加载
 */
 onLoad: function(options) {
 var that = this;
 mydata.sourceId = options.sourceId
 mydata.commentId = "";
 mydata.replyUserName = "";
 //设置scroll的高度
 wx.getSystemInfo({
  success: function(res) {
  that.setData({
   scrollHeight: res.windowHeight,
   userId:app.globalData.haulUserInfo.id
  });
  }
 });
 mydata.page = 1;
 that.getPageInfo(mydata.page);
 },
 /**
 * 页面下拉刷新事件的处理函数
 */
 refresh: function() {
 console.log('refresh');
 mydata.page = 1
 this.getPageInfo(mydata.page, function() {
  this.setData({
  list: []
  })
 });
 mydata.end = 0;
 },
 /**
 * 页面上拉触底事件的处理函数
 */
 bindDownLoad: function() {
 console.log("onReachBottom");
 var that = this;
 if (mydata.end == 0) {
  mydata.page++;
  that.getPageInfo(mydata.page);
 }
 },
 bindReply: function(e) {
 console.log(e);
 mydata.commentId = e.target.dataset.commentid;
 mydata.replyUserName = e.target.dataset.commentusername;
 this.setData({
  replyUserName: mydata.replyUserName,
  reply: true
 })
 },
 // 合并数组
 addArr(arr1, arr2) {
 for (var i = 0; i < arr2.length; i++) {
  arr1.push(arr2[i]);
 }
 return arr1;
 },
 deleteComment:function(e){
 console.log(e);
 var that = this;
 var commentId = e.target.dataset.commentid;

 wx.showModal({
  title: '删除评论',
  content: '请确认是否删除该评论？',
  success: function (res) {
  if (res.confirm) {
   wx.request({
   url: config.deleteComment,
   method: "POST",
   data: {
    commentId: commentId
   },
   header: {
    "content-type": "application/x-www-form-urlencoded;charset=utf-8",
   },
   success: res => {
    that.refresh();
    wx.showToast({
    title: "删除成功"
    })
   }
   })
  } else if (res.cancel) {
   console.log('用户点击取消')
  }
  }
 })
 },
 cancleReply: function(e) {
 mydata.commentId = "";
 mydata.replyUserName = "";
 this.setData({
  replyUserName: mydata.replyUserName,
  reply: false
 })
 },
 // 更新页面信息
 // 此处的回调函数在 传入新值之前执行 主要用来清除页面信息
 getPageInfo(page, callback) {
 var that = this;
 util.showLoading();
 console.log("getPageInfo");
 console.log("page" + page);
 var limited = 6;
 var offset = (page - 1) * 6;
 wx.request({
  url: config.getComments,
  method: "POST",
  data: {
  sourceId: mydata.sourceId,
  limited: limited,
  offset: offset
  },
  header: {
  "content-type": "application/x-www-form-urlencoded;charset=utf-8",
  },
  success: res => {
  console.log(res);
  if (page == 1) {
   that.data.list = res.data;
   that.setData({
   list: that.data.list
   })
   mydata.end = 0;
  } else {
   // 当前页为其他页
   var list = that.data.list;
   if (res.data.length != 0) {
   list = that.addArr(list, res.data);
   that.setData({
    list: list
   })
   mydata.end = 0;
   } else {
   mydata.end = 1;
   }
  }
  wx.hideLoading();
  }
 })
 },
 submitForm(e) {
 var form = e.detail.value;
 var that = this;
 console.log(app.globalData.haulUserInfo);
 if(form.comment == ""){
  util.showLog('请输入评论');
  return;
 }
 // 提交评论
 wx.request({
  url: config.insertComment,
  method: "POST",
  data: {
  sourceId: mydata.sourceId,
  comment: form.comment,
  userId: app.globalData.haulUserInfo.id,
  userName: app.globalData.haulUserInfo.userName,
  replyCommentId: mydata.commentId,
  replyUserName: mydata.replyUserName,
  userPhoto: app.globalData.haulUserInfo.userPhoto
  },
  header: {
  "content-type": "application/x-www-form-urlencoded;charset=utf-8",
  //token: app.globalData.token
  },
  success: res => {
  console.log(res)
  if (res.data.success) {
   wx.showToast({
   title: "回复成功"
   })
   that.refresh();
   mydata.commentId = "";
   mydata.replyUserName = "";
   this.setData({
   replyUserName: mydata.replyUserName,
   reply: false
   })
  } else {
   wx.showToast({
   title: '回复失败，请检查您的网络',
   })
  }
  }
 })
 }
})

后台

后台功能：获取评论、删除评论、插入评论，都是简单的数据库操作，放在一个controller类中实现即可

package com.melon.haul.web;

import java.sql.Date;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import net.sf.json.JSONObject;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.test.context.web.WebAppConfiguration;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.melon.haul.dto.DataUtil;
import com.melon.haul.dto.GetLocation;
import com.melon.haul.dto.Result;
import com.melon.haul.entity.Comment;
import com.melon.haul.entity.District;
import com.melon.haul.entity.Source;
import com.melon.haul.service.CommentService;
import com.melon.haul.service.DistrictService;
import com.melon.haul.service.SourceService;

@Controller
@WebAppConfiguration
@RequestMapping("/Comment")
public class CommentController {
 private Logger logger = LoggerFactory.getLogger(this.getClass());

 @Autowired
 private CommentService commentService;

 @RequestMapping(value = "/getComments", method = RequestMethod.POST)
 private @ResponseBody List<Comment> getComments(@RequestParam("sourceId") int sourceId,
 @RequestParam("limited") int limited,@RequestParam("offset") int offset) {
 logger.info("getComments");
 List<Comment> list = new ArrayList<Comment>();
 try{
 list = commentService.getComment(sourceId, limited, offset);
 }catch(Exception e){

 }
 return list;
 }

 @RequestMapping(value = "/insertComment", method = RequestMethod.POST)
 private @ResponseBody
 Result<Map<String,String>>insertComment(@RequestParam("sourceId") String sourceId,
 @RequestParam("comment") String comment,@RequestParam("userId") int userId,
 @RequestParam("userName") String userName,@RequestParam("replyCommentId") String replyCommentId,
 @RequestParam("replyUserName") String replyUserName,@RequestParam("userPhoto")String userPhoto) {
 logger.info("insertComment");
 Map<String, String> resultMap = new HashMap<String, String>();
 try{
 Integer rCId = -1;
 if(!replyCommentId.equals(""))
 rCId = Integer.parseInt(replyCommentId);
 commentService.insertComment(Integer.parseInt(sourceId), comment, userId,userName,rCId,replyUserName,userPhoto);
 resultMap.put("msg", "insertComment success");
 }catch(Exception e){
 System.out.print(e);
 resultMap.put("msg", "insertComment error");
 }
 return new Result<Map<String, String>>(true, resultMap);
 }

 @RequestMapping(value = "/deleteComment", method = RequestMethod.POST)
 private @ResponseBody
 Result<Map<String,String>>deleteComment(@RequestParam("commentId") String commentId) {
 logger.info("deleteComment");
 Map<String, String> resultMap = new HashMap<String, String>();
 try{
 commentService.deleteComment(commentId);
 resultMap.put("msg", "deleteComment success");
 }catch(Exception e){
 System.out.print(e);
 resultMap.put("msg", "deleteComment error");
 }
 return new Result<Map<String, String>>(true, resultMap);
 }
}

公共CSS（app.wxss）

 /**app.wxss**/
.container {
 height: 100%;
 display: flex;
 flex-direction: column;
 align-items: center;
 justify-content: space-between;
 padding: 200rpx 0;
 box-sizing: border-box;
}
/* large button style */
.large-btn{
 background: #f68135;
 border-radius: 50rpx;
 border: 1px solid #f68135;
 color: #fff;
 height: 100rpx;
 line-height: 100rpx;
 margin: 0 auto;
 width: 96%;
 text-align: center;
}
.large-btn.empty{
 background: transparent;
 color: #f68135;
 margin-top: 50rpx;
}
.large-btn.disabled{
 border-color: #ccc;
 background: #ccc;
 color: #fff;
}
/* public style to clear default styles */
.fl{
 float: left;
}
.fr{
 float: right;
}
.fc{
 float:none;
}
.col-gray{
 color: #999!important;
}

/* the message of auction about goods & cars */
.pro-con{
 padding: 20rpx;
 background: #f1f1f1;
}
.pro-box{
 background: #fff;
 padding: 20rpx;
 box-sizing: border-box;
 border-radius: 10rpx;
 margin-bottom: 20rpx;
}
.pro-box .img{
 display: inline-block;
 vertical-align: top;
 width: 80rpx;
 height: 80rpx;
 border-radius: 50%;
 overflow: hidden;
 margin-right: 10rpx;
}
.pro-box .box{
 display: inline-block;
 vertical-align: top;
 width: calc(98% - 80rpx);
}
.pro-box .shead{
 padding-bottom: 20rpx;
}
.pro-box .shead .name{
 font-size: 30rpx;
 line-height: 40rpx;
}
.pro-box .shead .stxt{
 font-size: 26rpx;
 color: #999;
}
.pro-box .shead .fr{
 padding-top: 10rpx;
}
.pro-box .shead .fr navigator{
 font-size: 0;
}
.pro-box .shead .fr image{
 width: 48rpx;
 height: 48rpx;
}
 .pro-box .sharebtn{
 height:48rpx;
 background: #f68135;
 border-radius: 50rpx;
 border: 1px solid #f68135;
 color: #fff;
 text-align: center;
 line-height: 50rpx;
 font-size:30rpx;
} 

.pro-box .addr-info{
 align-items: center;
 justify-content: space-between;
 border-bottom: 1px dashed #ccc;
 margin: 0 -20rpx;
 margin-bottom: 20rpx;
 padding-bottom: 20rpx;
 padding-left: 20rpx;
 padding-right: 20rpx;
 display: inline-block;
}

.pro-box .addr-info .addr-text{
 font-size: 35rpx;
 line-height: 40rpx;
 width:100%;
}
 .pro-box .addr-info .addr-text .color1{
 color:lightskyblue;
 border-color: #ccc;
 border: 1px solid lightskyblue;
 border-radius:15px;
 margin-right: 5px;
 padding: 0rpx,2rpx,0rpx,2rpx;
}
.pro-box .addr-info .addr-text .color2{
 color: #f68135;
 border-color: #ccc;
 border: 1px solid #f68135;
 border-radius:10px;
 margin-right: 5px;
 margin-left: 5px;
 padding: 0rpx,2rpx,0rpx,2rpx;
} 

.pro-box .position{
 width: 48rpx;
 height: 48rpx;
} 

.pro-box .comment{
 width: 55rpx;
 height: 48rpx;
} 

.pro-box .addr{
 align-items: center;
 justify-content: space-between;
 border-bottom: 1px dashed #ccc;
 margin: 0 -20rpx;
 margin-bottom: 20rpx;
 padding-bottom: 20rpx;
 padding-left: 20rpx;
 padding-right: 20rpx;
 display: flex;
}

.pro-box .addr .addr-text{
 font-size: 34rpx;
 line-height: 40rpx;
 max-width: 240rpx;
 min-width:200rpx;
 overflow: hidden;
 text-overflow: ellipsis;
 white-space: nowrap;
}
.pro-box .addr .addr-text .color-text{
 color: #f68135;
}
.pro-box .addr .time{
 font-size: 26rpx;
 line-height: 36rpx;
 text-align: center;
}
.pro-box .addr .line{
 background: #ccc;
 height: 1px;
 margin: 6rpx -20rpx;
 position: relative;
}
.pro-box .info{
 display: flex;
 align-items: center;
 justify-content: space-between;
}
.pro-box .info .text{
 vertical-align:text-top;
 font-size: 26rpx;
}
.pro-box .info .text .delete{
 color: #f68135;
 border-radius: 50rpx;
 border: 1px solid #f68135;
 width: 100rpx;
 height: 48rpx;
 text-align: center;
}

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我们。