1. 功能描述
- 开发私信列表功能，即在朋友私信页面，显示所有的会话。
- 查询当前用户的会话列表，每个会话只显示最新一条私信。
- 支持分页显示。
- 开发私信详情功能，即在私信列表上点击某一个会话时，显示该会话包含的所有私信。
- 查询某个会话所包含的私信。
- 支持分页显示。
2. 实体类与 XML 映射
2.1 实体类 Message
entity/Message.java
package com.nowcoder.community.entity;
import java.util.Date;
public class Message {
private int id;
private int fromId;
private int toId;
private String conversationId;
private String content;
private int status;
private Date createTime;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getFromId() {
return fromId;
}
public void setFromId(int fromId) {
this.fromId = fromId;
}
public int getToId() {
return toId;
}
public void setToId(int toId) {
this.toId = toId;
}
public String getConversationId() {
return conversationId;
}
public void setConversationId(String conversationId) {
this.conversationId = conversationId;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public int getStatus() {
return status;
}
public void setStatus(int status) {
this.status = status;
}
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
@Override
public String toString() {
return "Message{" +
"id=" + id +
", fromId=" + fromId +
", toId=" + toId +
", conversationId='" + conversationId + '\'' +
", content='" + content + '\'' +
", status=" + status +
", createTime=" + createTime +
'}';
}
}
2.2 XML 映射
mapper/message-mapper.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.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(m.maxid) from (
select max(id) as maxid from message
where status != 2
and from_id != 1
and (from_id = #{
userId} or to_id = #{
userId})
group by conversation_id
) as m
</select>
<select id="selectLetters" resultType="Message">
select <include refid="selectFields"></include>
from message
where status != 2
and from_id != 1
and conversation_id = #{
conversationId}
order by id desc
limit #{
offset}, #{
limit}
</select>
<select id="selectLetterCount" resultType="int">
select count(id)
from message
where status != 2
and from_id != 1
and conversation_id = #{
conversationId}
</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>
</mapper>
3. Dao
编写接口 MessageMapper.java
package com.nowcoder.community.dao;
import com.nowcoder.community.entity.Message;
import org.apache.ibatis.annotations.Mapper;
import java.util.List;
@Mapper
public interface MessageMapper {
// 查询当前用户的会话列表,针对每个会话只返回一条最新的私信.
List<Message> selectConversations(int userId, int offset, int limit);
// 查询当前用户的会话数量.
int selectConversationCount(int userId);
// 查询某个会话所包含的私信列表.
List<Message> selectLetters(String conversationId, int offset, int limit);
// 查询某个会话所包含的私信数量.
int selectLetterCount(String conversationId);
// 查询未读私信的数量
int selectLetterUnreadCount(int userId, String conversationId);
// 新增消息
int insertMessage(Message message);
// 修改消息的状态
int updateStatus(List<Integer> ids, int status);
}
4. Service
service/MessageService.java
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);
}
}
5. Controller
controller/MessageController.java
package com.nowcoder.community.controller;
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.ui.Model;
import org.springframework.web.bind.annotation.*;
import java.util.*;
@Controller
public class MessageController {
@Autowired
private MessageService messageService;
@Autowired
private HostHolder hostHolder;
@Autowired
private UserService userService;
// 私信列表
@GetMapping("/letter/list")
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()));
// 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("letterCount", messageService.findLetterCount(message.getConversationId()));
map.put("unreadCount", messageService.findLetterUnreadCount(user.getId(), message.getConversationId()));
int targetId = user.getId() == message.getFromId() ? message.getToId() : message.getFromId();
map.put("target", userService.findUserById(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", letterUnreadCount);
return "/site/letter";
}
@GetMapping("/letter/detail/{conversationId}")
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;
}
@PostMapping ("/letter/send")
@ResponseBody
public String sendLetter(String toName, String content) {
User target = userService.findUserByName(toName);
if (target == null) {
return CommunityUtil.getJSONString(1, "目标用户不存在!");
}
Message message = new Message();
message.setFromId(hostHolder.getUser().getId());
message.setToId(target.getId());
if (message.getFromId() < message.getToId()) {
message.setConversationId(message.getFromId() + "_" + message.getToId());
} else {
message.setConversationId(message.getToId() + "_" + message.getFromId());
}
message.setContent(content);
message.setCreateTime(new Date());
messageService.addMessage(message);
return CommunityUtil.getJSONString(0);
}
}
6. HTML
templates/site/letter-detail.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>牛客网-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">
发送完毕!
</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>
<button type="button" class="ml-2 mb-1 close" data-dismiss="toast" aria-label="Close">
<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>
</body>
</html>