355 lines
10 KiB
Markdown
355 lines
10 KiB
Markdown
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# 私信列表
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---
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本节实现的功能：
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- 私信列表：
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- 查询当前用户的会话列表
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- 每个会话只显示一条最新的私信
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- 支持分页显示
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- 私信详情
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- 查询某个会话所包含的私信
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- 支持分页显示
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- 访问私信详情时，将显示的私信设为已读状态
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`message` 表中有个字段 `conservation_id` ，这个字段的设计方式是：比如用户 id 112 给 113 发消息，或者 113 给 112 发消息，这两个会话的 `conservation_id` 都是 `112_113`。当然，这个字段是冗余的，我们可以通过 from_id 和 to_id 推演出来，但是有了这个字段方便于后面的查询等操作
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注意：`from_id = 1` 代表这是一个系统通知，后续会开发此功能
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## DAO
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```java
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@Mapper
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public interface MessageMapper {
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/**
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* 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
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* @param userId 用户 id
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* @param offset 每页的起始索引
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* @param limit 每页显示多少条数据
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* @return
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*/
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List<Message> selectConversations(int userId, int offset, int limit);
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/**
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* 查询当前用户的会话数量
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* @param userId
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* @return
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*/
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int selectConversationCount(int userId);
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/**
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* 查询某个会话所包含的私信列表
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* @param conversationId
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* @param offset
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* @param limit
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* @return
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*/
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List<Message> selectLetters(String conversationId, int offset, int limit);
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/**
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* 查询某个会话所包含的私信数量
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* @param conversationId
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* @return
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*/
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int selectLetterCount(String conversationId);
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/**
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* 查询未读私信的数量
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* @param userId
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* @param conversationId conversationId = null, 则查询该用户所有会话的未读私信数量
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* conversationId != null, 则查询该用户某个会话的未读私信数量
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* @return
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*/
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int selectLetterUnreadCount(int userId, String conversationId);
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/**
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* 修改消息的状态
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* @param ids
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* @param status
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* @return
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*/
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int updateStatus(List<Integer> ids, int status);
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}
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```
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对应的 `mapper.xml`
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```xml
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<mapper namespace="com.greate.community.dao.MessageMapper">
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<sql id="selectFields">
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id, from_id, to_id, conversation_id, content, status, create_time
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</sql>
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<!--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）-->
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<select id="selectConversations" resultType="Message">
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select <include refid="selectFields"></include>
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from message
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where id in (
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select max(id)
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from message
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where status != 2
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and from_id != 1
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and (from_id = #{userId} or to_id = #{userId})
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group by conversation_id
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)
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order by id desc
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limit #{offset}, #{limit}
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</select>
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<!--查询当前用户的会话数量-->
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<select id="selectConversationCount" resultType="int">
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select count(m.maxid) from (
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select max(id) as maxid
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from message
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where status != 2
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and from_id != 1
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and (from_id = #{userId} or to_id = #{toId})
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group by conversation_id
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) as m
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</select>
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<!--查询某个会话所包含的私信列表-->
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<select id="selectLetters" resultType="Message">
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select <include refid="selectFields"></include>
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from message
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where status != 2
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and from_id != 1
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and conversation_id = #{conversationId}
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order by id desc
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limit #{offset}, #{limit}
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</select>
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<!--查询某个会话所包含的私信数量-->
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<select id="selectLetterCount" resultType="int">
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select count(id)
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from message
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where status != 2
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and from_id != 1
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and conversation_id = #{conversationId}
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</select>
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<!--查询未读私信的数量-->
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<select id="selectLetterUnreadCount" resultType="int">
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select count(id)
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from message
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where status = 0
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and from_id != 1
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and to_id = #{userId}
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<if test="conversationId != null">
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and conversation_id = #{conversationId}
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</if>
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</select>
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<!--修改消息的状态-->
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<update id="updateStatus">
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update message
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set status = #{status}
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where id in
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<foreach collection="ids" item="id" open="(" separator="," close=")">
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#{id}
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</foreach>
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</update>
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</mapper>
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```
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## Service
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```java
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@Service
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public class MessageService {
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@Autowired
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private MessageMapper messageMapper;
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// 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
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public List<Message> findConversations(int userId, int offset, int limit) {
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return messageMapper.selectConversations(userId, offset, limit);
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}
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// 查询当前用户的会话数量
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public int findConversationCout(int userId) {
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return messageMapper.selectConversationCount(userId);
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}
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// 查询某个会话所包含的私信列表
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public List<Message> findLetters(String conversationId, int offset, int limit) {
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return messageMapper.selectLetters(conversationId, offset, limit);
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}
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// 查询某个会话所包含的私信数量
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public int findLetterCount(String conversationId) {
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return messageMapper.selectLetterCount(conversationId);
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}
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// 查询未读私信的数量
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public int findLetterUnreadCount(int userId, String conversationId) {
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return messageMapper.selectLetterUnreadCount(userId, conversationId);
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}
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// 读取私信(将私信状态设置为已读)
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public int readMessage(List<Integer> ids) {
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return messageMapper.updateStatus(ids, 1);
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}
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}
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```
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## Controller
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```java
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@Controller
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public class MessageController {
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@Autowired
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private HostHolder hostHolder;
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@Autowired
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private MessageService messageService;
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@Autowired
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private UserService userService;
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/**
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* 私信列表
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* @param model
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* @param page
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* @return
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*/
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@GetMapping("/letter/list")
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public String getLetterList(Model model, Page page) {
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User user = hostHolder.getUser();
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// 分页信息
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page.setLimit(5);
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page.setPath("/letter/list");
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page.setRows(messageService.findConversationCout(user.getId()));
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// 会话列表
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List<Message> conversationList = messageService.findConversations(
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user.getId(), page.getOffset(), page.getLimit());
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List<Map<String, Object>> conversations = new ArrayList<>();
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if (conversationList != null) {
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for (Message message : conversationList) {
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Map<String, Object> map = new HashMap<>();
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map.put("conversation", message); // 私信
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map.put("letterCount", messageService.findLetterCount(
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message.getConversationId())); // 私信数量
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map.put("unreadCount", messageService.findLetterUnreadCount(
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user.getId(), message.getConversationId())); // 未读私信数量
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int targetId = user.getId() == message.getFromId() ? message.getToId() : message.getFromId();
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map.put("target", userService.findUserById(targetId)); // 私信对方
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conversations.add(map);
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}
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}
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model.addAttribute("conversations", conversations);
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// 查询当前用户的所有未读私信数量
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int letterUnreadCount = messageService.findLetterUnreadCount(user.getId(), null);
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model.addAttribute("letterUnreadCount", letterUnreadCount);
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return "/site/letter";
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}
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/**
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* 私信详情页
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* @param conversationId
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* @param page
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* @param model
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* @return
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*/
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@GetMapping("/letter/detail/{conversationId}")
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public String getLetterDetail(@PathVariable("conversationId") String conversationId, Page page, Model model) {
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// 分页信息
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page.setLimit(5);
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page.setPath("/letter/detail/" + conversationId);
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page.setRows(messageService.findLetterCount(conversationId));
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// 私信列表
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List<Message> letterList = messageService.findLetters(conversationId, page.getOffset(), page.getLimit());
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List<Map<String, Object>> letters = new ArrayList<>();
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if (letterList != null) {
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for (Message message : letterList) {
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Map<String, Object> map = new HashMap<>();
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map.put("letter", message);
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map.put("fromUser", userService.findUserById(message.getFromId()));
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letters.add(map);
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}
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}
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model.addAttribute("letters", letters);
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// 私信目标
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model.addAttribute("target", getLetterTarget(conversationId));
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// 将私信列表中的未读消息改为已读
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List<Integer> ids = getUnreadLetterIds(letterList);
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if (!ids.isEmpty()) {
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messageService.readMessage(ids);
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}
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return "/site/letter-detail";
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}
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/**
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* 获取私信对方对象
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* @param conversationId
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* @return
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*/
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private User getLetterTarget(String conversationId) {
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String[] ids = conversationId.split("_");
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int id0 = Integer.parseInt(ids[0]);
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int id1 = Integer.parseInt(ids[1]);
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if (hostHolder.getUser().getId() == id0) {
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return userService.findUserById(id1);
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}
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else {
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return userService.findUserById(id0);
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}
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}
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/**
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* 获取当前登录用户未读私信的 id
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* @param letterList
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* @return
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*/
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private List<Integer> getUnreadLetterIds(List<Message> letterList) {
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List<Integer> ids = new ArrayList<>();
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if (letterList != null) {
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for (Message message : letterList) {
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// 当前用户是私信的接收者且该私信处于未读状态
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if (hostHolder.getUser().getId() == message.getToId() && message.getStatus() == 0) {
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ids.add(message.getId());
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}
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}
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}
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return ids;
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}
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}
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```
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## 前端
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`letter-detail`
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```html
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li th:each="map:${letters}">
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<img th:src="${map.fromUser.headerUrl}" alt="用户头像" >
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<strong th:utext="${map.fromUser.username}"></strong>
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<div th:utext="${map.letter.content}"></div>
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</li>
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```
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