【Java Web】实现发送和删除私信
- 数据访问层：
- 发送私信：在数据库中增加一条message；
- 删除私信：在数据库中删除一条message；
- 业务逻辑层：
- 发送私信：调用增加message的sql
- 删除私信：调用删除message的sql
- 表现层
- 实现controller
- 前端页面和js
一、数据访问层
1.1 Message类
见上几篇
1.2 message-mapper.xml
新增insert语句和delete语句：
<?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.nowcoder.community.dao.MessageMapper">
<sql id="selectFields">
id, from_id, to_id, conversation_id, content, status, create_time
</sql>
<sql id="insertFields">
from_id, to_id, conversation_id, content, status, create_time
</sql>
<select id="selectConversations" resultType="Message">
select <include refid="selectFields"></include>
from message
where id in (
select max(id) from message
where status != 2
and from_id != 1
and (from_id=#{userId} or to_id=#{userId})
group by conversation_id
)
order by id desc
limit #{offset}, #{limit}
</select>
<select id="selectConversationCount" resultType="int">
select count(id) from message where id in(
select max(id) from message
where status != 2
and from_id != 1
and (from_id=#{userId} or to_id=#{userId})
group by conversation_id
)
</select>
<select id="selectLetters" resultType="Message">
select <include refid="selectFields"></include>
from message
where conversation_id = #{conversationId}
and status != 2
and from_id != 1
order by id desc
limit #{offset}, #{limit}
</select>
<select id="selectLetterCount" resultType="int">
select count(id)
from message
where conversation_id = #{conversationId}
and status != 2
and from_id != 1
</select>
<select id="selectLetterUnreadCount" resultType="int">
select count(id) from message
where status = 0
and from_id != 1
and to_id = #{userId}
<if test="conversationId!=null">
and conversation_id = #{conversationId}
</if>
</select>
<insert id="insertMessage" parameterType="Message" keyProperty="id">
insert into message (<include refid="insertFields"></include>)
values (#{fromId},#{toId},#{conversationId},#{content},#{status},#{createTime})
</insert>
<update id="updateStatus">
update message set status = #{status}
where id in
<foreach collection="ids" item="id" open="(" separator="," close=")">
#{id}
</foreach>
</update>
<update id="deleteMessage">
delete from message
where id = #{id}
</update>
</mapper>
二、业务逻辑层
2.1 Message Service
package com.nowcoder.community.service;
import com.nowcoder.community.dao.MessageMapper;
import com.nowcoder.community.entity.Message;
import com.nowcoder.community.util.SensitiveFilter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.util.HtmlUtils;
import java.util.List;
@Service
public class MessageService {
@Autowired
private MessageMapper messageMapper;
@Autowired
private SensitiveFilter sensitiveFilter;
public List<Message> findConversations(int userId, int offset, int limit) {
return messageMapper.selectConversations(userId, offset, limit);
}
public int findConversationCount(int userId) {
return messageMapper.selectConversationCount(userId);
}
public List<Message> findLetters(String conversationId, int offset, int limit) {
return messageMapper.selectLetters(conversationId, offset, limit);
}
public int findLetterCount(String conversationId) {
return messageMapper.selectLetterCount(conversationId);
}
public int findLetterUnreadCount(int userId, String conversationId) {
return messageMapper.selectLetterUnreadCount(userId, conversationId);
}
public int addMessage(Message message) {
message.setContent(HtmlUtils.htmlEscape(message.getContent()));
message.setContent(sensitiveFilter.filter(message.getContent()));
return messageMapper.insertMessage(message);
}
public int readMessage(List<Integer> ids) {
return messageMapper.updateStatus(ids, 1);
}
public int deleteMessage(int id){
return messageMapper.deleteMessage(id);
}
}
三、表示层
3.1 Controller
关注addMessage和deleteMessage方法：
package com.nowcoder.community.controller;
import com.nowcoder.community.dao.MessageMapper;
import com.nowcoder.community.dao.UserMapper;
import com.nowcoder.community.entity.Message;
import com.nowcoder.community.entity.Page;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.MessageService;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.util.CommunityUtil;
import com.nowcoder.community.util.HostHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.stereotype.Service;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.*;
@Controller
public class MessageController {
@Autowired
private MessageService messageService;
@Autowired
private HostHolder hostHolder;
@Autowired
private UserMapper userMapper;
@Autowired
private UserService userService;
// 私信列表
@RequestMapping(path = "/letter/list", method = RequestMethod.GET)
public String getLetterList(Model model, Page page){
User user = hostHolder.getUser();
// 分页信息
page.setLimit(5);
page.setPath("/letter/list");
page.setRows(messageService.findConversationCount(user.getId()));
// 查询会话列表
List<Message> conversationList = messageService.findConversations(
user.getId(),page.getOffset(),page.getLimit());
List<Map<String,Object>> conversations = new ArrayList<>();
if(conversationList != null){
for(Message message: conversationList){
Map<String,Object> map = new HashMap<>();
map.put("conversation",message);
map.put("unreadCount", messageService.findLetterUnreadCount(user.getId(),message.getConversationId()));
map.put("letterCount",messageService.findLetterCount(message.getConversationId()));
int targetId = user.getId() == message.getFromId() ? message.getToId() : message.getFromId();
map.put("target", userMapper.selectById(targetId));
conversations.add(map);
}
}
model.addAttribute("conversations", conversations);
// 查询未读消息数量
int letterUnreadCount = messageService.findLetterUnreadCount(user.getId(), null);
model.addAttribute(letterUnreadCount);
return "/site/letter";
}
@RequestMapping(path = "/letter/detail/{conversationId}", method = RequestMethod.GET)
public String getLetterDetail(@PathVariable("conversationId") String conversationId, Page page, Model model){
// 分页信息
page.setLimit(5);
page.setPath("/letter/detail/"+conversationId);
page.setRows(messageService.findLetterCount(conversationId));
// 私信列表
List<Message> letterList = messageService.findLetters(conversationId, page.getOffset(), page.getLimit());
List<Map<String,Object>> letters = new ArrayList<>();
if(letterList!=null){
for(Message message: letterList){
Map<String,Object> map = new HashMap<>();
map.put("letter", message);
map.put("fromUser", userService.findUserById(message.getFromId()));
letters.add(map);
}
}
model.addAttribute("letters",letters);
// 私信目标
model.addAttribute("target",getLetterTarget(conversationId));
// 设置已读
List<Integer> ids = getLetterIds(letterList);
if(!ids.isEmpty()){
messageService.readMessage(ids);
}
return "/site/letter-detail";
}
private User getLetterTarget(String conversationId){
String[] ids = conversationId.split("_");
int id0 = Integer.parseInt(ids[0]);
int id1 = Integer.parseInt(ids[1]);
if(hostHolder.getUser().getId() == id0){
return userService.findUserById(id1);
} else {
return userService.findUserById(id0);
}
}
private List<Integer> getLetterIds(List<Message> letterList){
List<Integer> ids = new ArrayList<>();
if(letterList != null){
for(Message message: letterList){
if(hostHolder.getUser().getId() == message.getToId() && message.getStatus() == 0){
ids.add(message.getId());
}
}
}
return ids;
}
@RequestMapping(path = "/letter/send", method = RequestMethod.POST)
@ResponseBody
public String sendLetter(String toName, String content){
System.out.println(toName);
User target = userService.findUserByName(toName);
if(target == null)
return CommunityUtil.getJSONString(1,"用户不存在！");
Message message = new Message();
message.setFromId(hostHolder.getUser().getId());
System.out.println(hostHolder.getUser().getId());
message.setToId(target.getId());
if(message.getToId() < message.getFromId()){
message.setConversationId(message.getToId() + "_" + message.getFromId());
} else {
message.setConversationId(message.getFromId() + "_" + message.getToId());
}
message.setContent(content);
message.setCreateTime(new Date());
int result = messageService.addMessage(message);
System.out.println(result);
return CommunityUtil.getJSONString(0);
}
@RequestMapping(path = "/letter/delete", method = RequestMethod.POST)
@ResponseBody
public String deleteMessage(int id){
System.out.println(id);
messageService.deleteMessage(id);
return CommunityUtil.getJSONString(0);
}
}
3.2 html
<!doctype html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="icon" href="https://static.nowcoder.com/images/logo_87_87.png"/>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" crossorigin="anonymous">
<link rel="stylesheet" th:href="@{/css/global.css}" />
<link rel="stylesheet" th:href="@{/css/letter.css}" />
<title>果壳网-私信详情</title>
</head>
<body>
<div class="nk-container">
<!-- 头部 -->
<header class="bg-dark sticky-top" th:replace="index::header">
<div class="container">
<!-- 导航 -->
<nav class="navbar navbar-expand-lg navbar-dark">
<!-- logo -->
<a class="navbar-brand" href="#"></a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<!-- 功能 -->
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item ml-3 btn-group-vertical">
<a class="nav-link" href="../index.html">首页</a>
</li>
<li class="nav-item ml-3 btn-group-vertical">
<a class="nav-link position-relative" href="letter.html">消息<span class="badge badge-danger">12</span></a>
</li>
<li class="nav-item ml-3 btn-group-vertical">
<a class="nav-link" href="register.html">注册</a>
</li>
<li class="nav-item ml-3 btn-group-vertical">
<a class="nav-link" href="login.html">登录</a>
</li>
<li class="nav-item ml-3 btn-group-vertical dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
<img src="http://images.nowcoder.com/head/1t.png" class="rounded-circle" style="width:30px;"/>
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item text-center" href="profile.html">个人主页</a>
<a class="dropdown-item text-center" href="setting.html">账号设置</a>
<a class="dropdown-item text-center" href="login.html">退出登录</a>
<div class="dropdown-divider"></div>
<span class="dropdown-item text-center text-secondary">nowcoder</span>
</div>
</li>
</ul>
<!-- 搜索 -->
<form class="form-inline my-2 my-lg-0" action="search.html">
<input class="form-control mr-sm-2" type="search" aria-label="Search" />
<button class="btn btn-outline-light my-2 my-sm-0" type="submit">搜索</button>
</form>
</div>
</nav>
</div>
</header>
<!-- 内容 -->
<div class="main">
<div class="container">
<div class="row">
<div class="col-8">
<h6><b class="square"></b> 来自 <i class="text-success" th:utext="${target.username}">落基山脉下的闲人</i> 的私信</h6>
</div>
<div class="col-4 text-right">
<button type="button" class="btn btn-secondary btn-sm" onclick="back();">返回</button>
<button type="button" class="btn btn-primary btn-sm" data-toggle="modal" data-target="#sendModal">给TA私信</button>
</div>
</div>
<!-- 弹出框 -->
<div class="modal fade" id="sendModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog modal-lg" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLabel">发私信</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<form>
<div class="form-group">
<label for="recipient-name" class="col-form-label">发给：</label>
<input type="text" class="form-control" id="recipient-name" th:value="${target.username}">
</div>
<div class="form-group">
<label for="message-text" class="col-form-label">内容：</label>
<textarea class="form-control" id="message-text" rows="10"></textarea>
</div>
</form>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">取消</button>
<button type="button" class="btn btn-primary" id="sendBtn">发送</button>
</div>
</div>
</div>
</div>
<!-- 提示框 -->
<div class="modal fade" id="hintModal" tabindex="-1" role="dialog" aria-labelledby="hintModalLabel" aria-hidden="true">
<div class="modal-dialog modal-lg" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="hintModalLabel">提示</h5>
</div>
<div class="modal-body" id="hintBody">
发送成功!
</div>
</div>
</div>
</div>
<!-- 私信列表 -->
<ul class="list-unstyled mt-4">
<li class="media pb-3 pt-3 mb-2" th:each="map:${letters}">
<a href="profile.html">
<img th:src="${map.fromUser.headerUrl}" class="mr-4 rounded-circle user-header" alt="用户头像" >
</a>
<div class="toast show d-lg-block" role="alert" aria-live="assertive" aria-atomic="true">
<div class="toast-header">
<strong class="mr-auto" th:utext="${map.fromUser.username}">落基山脉下的闲人</strong>
<small th:text="${#dates.format(map.letter.createTime,'yyyy-MM-dd HH:mm:ss')}">2019-04-25 15:49:32</small>
<!--删除时依赖的条件-->
<input type="hidden" th:value="${map.letter.id}" id="delete">
<button type="button" class="ml-2 mb-1 close" data-dismiss="toast" aria-label="Close" onclick="deleteLetter();">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="toast-body" th:utext="${map.letter.content}">
君不见, 黄河之水天上来, 奔流到海不复回!
</div>
</div>
</li>
</ul>
<!-- 分页 -->
<nav class="mt-5" th:replace="index::pagination">
<ul class="pagination justify-content-center">
<li class="page-item"><a class="page-link" href="#">首页</a></li>
<li class="page-item disabled"><a class="page-link" href="#">上一页</a></li>
<li class="page-item active"><a class="page-link" href="#">1</a></li>
<li class="page-item"><a class="page-link" href="#">2</a></li>
<li class="page-item"><a class="page-link" href="#">3</a></li>
<li class="page-item"><a class="page-link" href="#">4</a></li>
<li class="page-item"><a class="page-link" href="#">5</a></li>
<li class="page-item"><a class="page-link" href="#">下一页</a></li>
<li class="page-item"><a class="page-link" href="#">末页</a></li>
</ul>
</nav>
</div>
</div>
<!-- 尾部 -->
<footer class="bg-dark">
<div class="container">
<div class="row">
<!-- 二维码 -->
<div class="col-4 qrcode">
<img src="https://uploadfiles.nowcoder.com/app/app_download.png" class="img-thumbnail" style="width:136px;" />
</div>
<!-- 公司信息 -->
<div class="col-8 detail-info">
<div class="row">
<div class="col">
<ul class="nav">
<li class="nav-item">
<a class="nav-link text-light" href="#">关于我们</a>
</li>
<li class="nav-item">
<a class="nav-link text-light" href="#">加入我们</a>
</li>
<li class="nav-item">
<a class="nav-link text-light" href="#">意见反馈</a>
</li>
<li class="nav-item">
<a class="nav-link text-light" href="#">企业服务</a>
</li>
<li class="nav-item">
<a class="nav-link text-light" href="#">联系我们</a>
</li>
<li class="nav-item">
<a class="nav-link text-light" href="#">免责声明</a>
</li>
<li class="nav-item">
<a class="nav-link text-light" href="#">友情链接</a>
</li>
</ul>
</div>
</div>
<div class="row">
<div class="col">
<ul class="nav btn-group-vertical company-info">
<li class="nav-item text-white-50">
公司地址：北京市朝阳区大屯路东金泉时代3-2708北京牛客科技有限公司
</li>
<li class="nav-item text-white-50">
联系方式：010-60728802(电话) admin@nowcoder.com
</li>
<li class="nav-item text-white-50">
牛客科技©2018 All rights reserved
</li>
<li class="nav-item text-white-50">
京ICP备14055008号-4
<img src="http://static.nowcoder.com/company/images/res/ghs.png" style="width:18px;" />
京公网安备 11010502036488号
</li>
</ul>
</div>
</div>
</div>
</div>
</div>
</footer>
</div>
<script src="https://code.jquery.com/jquery-3.3.1.min.js" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" crossorigin="anonymous"></script>
<script th:src="@{/js/global.js}"></script>
<script th:src="@{/js/letter.js}"></script>
<script>
function back() {
location.href = CONTEXT_PATH + "/letter/list";
}
</script>
<script>
function deleteLetter() {
// var id = $("delete").val();
var id = document.getElementById('delete').value;
console.log(id);
$.post(
CONTEXT_PATH + "/letter/delete",
{"id":id},
function (data) {
data = $.parseJSON(data);
if(data.code == 0){
alert("删除成功！");
}
}
)
}
</script>
</body>
</html>
3.3 letter.js
$(function(){
$("#sendBtn").click(send_letter);
$(".close").click(delete_msg);
});
function send_letter() {
$("#sendModal").modal("hide");
var toName = $("#recipient-name").val();
var content = $("#message-text").val();
console.log(toName);
console.log(content);
$.post(
CONTEXT_PATH + "/letter/send",
{"toName":toName, 'content':content},
function (data){
data = $.parseJSON(data);
console.log(data.code);
if(data.code == 0){
$("#hintBody").text("发送成功");
} else {
$("#hintBody").text(data.msg);
}
$("#hintModal").modal("show");
setTimeout(function(){
$("#hintModal").modal("hide");
location.reload();
}, 2000);
}
);
}
function delete_msg() {
// TODO 删除数据
$(this).parents(".media").remove();
}