feat: add channel support

feat: add person search dropdown

backend/src/main/java/com/openisle/config/ChannelInitializer.java

@@ -0,0 +1,32 @@
+package com.openisle.config;
+
+import com.openisle.model.MessageConversation;
+import com.openisle.repository.MessageConversationRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.stereotype.Component;
+
+@Component
+@RequiredArgsConstructor
+public class ChannelInitializer implements CommandLineRunner {
+    private final MessageConversationRepository conversationRepository;
+
+    @Override
+    public void run(String... args) {
+        if (conversationRepository.countByChannelTrue() == 0) {
+            MessageConversation chat = new MessageConversation();
+            chat.setChannel(true);
+            chat.setName("吹水群");
+            chat.setDescription("吹水聊天");
+            chat.setAvatar("/default-avatar.svg");
+            conversationRepository.save(chat);
+
+            MessageConversation tech = new MessageConversation();
+            tech.setChannel(true);
+            tech.setName("技术讨论群");
+            tech.setDescription("讨论技术相关话题");
+            tech.setAvatar("/default-avatar.svg");
+            conversationRepository.save(tech);
+        }
+    }
+}

backend/src/main/java/com/openisle/controller/ChannelController.java

@@ -0,0 +1,35 @@
+package com.openisle.controller;
+
+import com.openisle.dto.ChannelDto;
+import com.openisle.model.User;
+import com.openisle.repository.UserRepository;
+import com.openisle.service.ChannelService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.security.core.Authentication;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/channels")
+@RequiredArgsConstructor
+public class ChannelController {
+    private final ChannelService channelService;
+    private final UserRepository userRepository;
+
+    private Long getCurrentUserId(Authentication auth) {
+        User user = userRepository.findByUsername(auth.getName())
+                .orElseThrow(() -> new IllegalArgumentException("User not found"));
+        return user.getId();
+    }
+
+    @GetMapping
+    public List<ChannelDto> listChannels(Authentication auth) {
+        return channelService.listChannels(getCurrentUserId(auth));
+    }
+
+    @PostMapping("/{channelId}/join")
+    public ChannelDto joinChannel(@PathVariable Long channelId, Authentication auth) {
+        return channelService.joinChannel(channelId, getCurrentUserId(auth));
+    }
+}

backend/src/main/java/com/openisle/controller/MessageController.java

@@ -59,6 +59,14 @@ public class MessageController {
         return ResponseEntity.ok(toDto(message));
     }
 
+    @PostMapping("/conversations/{conversationId}/messages")
+    public ResponseEntity<MessageDto> sendMessageToConversation(@PathVariable Long conversationId,
+                                                                @RequestBody ChannelMessageRequest req,
+                                                                Authentication auth) {
+        Message message = messageService.sendMessageToConversation(getCurrentUserId(auth), conversationId, req.getContent());
+        return ResponseEntity.ok(toDto(message));
+    }
+
     @PostMapping("/conversations/{conversationId}/read")
     public ResponseEntity<Void> markAsRead(@PathVariable Long conversationId, Authentication auth) {
         messageService.markConversationAsRead(conversationId, getCurrentUserId(auth));
@@ -114,4 +122,16 @@ public class MessageController {
             this.content = content;
         }
     }
+
+    static class ChannelMessageRequest {
+        private String content;
+
+        public String getContent() {
+            return content;
+        }
+
+        public void setContent(String content) {
+            this.content = content;
+        }
+    }
 }

backend/src/main/java/com/openisle/dto/ChannelDto.java

@@ -0,0 +1,16 @@
+package com.openisle.dto;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class ChannelDto {
+    private Long id;
+    private String name;
+    private String description;
+    private String avatar;
+    private long memberCount;
+    private boolean joined;
+    private long unreadCount;
+}

backend/src/main/java/com/openisle/dto/ConversationDetailDto.java

@@ -8,6 +8,9 @@ import java.util.List;
 @Data
 public class ConversationDetailDto {
     private Long id;
+    private String name;
+    private boolean channel;
+    private String avatar;
     private List<UserSummaryDto> participants;
     private Page<MessageDto> messages;
 }

backend/src/main/java/com/openisle/dto/ConversationDto.java

@@ -10,6 +10,9 @@ import java.util.List;
 @Setter
 public class ConversationDto {
     private Long id;
+    private String name;
+    private boolean channel;
+    private String avatar;
     private MessageDto lastMessage;
     private List<UserSummaryDto> participants;
     private LocalDateTime createdAt;

backend/src/main/java/com/openisle/model/MessageConversation.java

@@ -20,6 +20,18 @@ public class MessageConversation {
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
 
+    // Indicates whether this conversation represents a public channel
+    @Column(nullable = false)
+    private boolean channel = false;
+
+    // Channel metadata
+    private String name;
+
+    @Column(columnDefinition = "TEXT")
+    private String description;
+
+    private String avatar;
+
     @CreationTimestamp
     @Column(nullable = false, updatable = false)
     private LocalDateTime createdAt;

backend/src/main/java/com/openisle/repository/MessageConversationRepository.java

@@ -28,4 +28,8 @@ public interface MessageConversationRepository extends JpaRepository<MessageConv
            "WHERE p.user.id = :userId " +
            "ORDER BY COALESCE(lm.createdAt, c.createdAt) DESC")
     List<MessageConversation> findConversationsByUserIdOrderByLastMessageDesc(@Param("userId") Long userId);
+
+    List<MessageConversation> findByChannelTrue();
+
+    long countByChannelTrue();
 }

backend/src/main/java/com/openisle/service/ChannelService.java

@@ -0,0 +1,76 @@
+package com.openisle.service;
+
+import com.openisle.dto.ChannelDto;
+import com.openisle.model.MessageConversation;
+import com.openisle.model.MessageParticipant;
+import com.openisle.model.User;
+import com.openisle.repository.MessageConversationRepository;
+import com.openisle.repository.MessageParticipantRepository;
+import com.openisle.repository.MessageRepository;
+import com.openisle.repository.UserRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.time.LocalDateTime;
+import java.util.List;
+import java.util.stream.Collectors;
+
+@Service
+@RequiredArgsConstructor
+public class ChannelService {
+    private final MessageConversationRepository conversationRepository;
+    private final MessageParticipantRepository participantRepository;
+    private final MessageRepository messageRepository;
+    private final UserRepository userRepository;
+
+    @Transactional(readOnly = true)
+    public List<ChannelDto> listChannels(Long userId) {
+        List<MessageConversation> channels = conversationRepository.findByChannelTrue();
+        return channels.stream().map(c -> toDto(c, userId)).collect(Collectors.toList());
+    }
+
+    @Transactional
+    public ChannelDto joinChannel(Long channelId, Long userId) {
+        MessageConversation channel = conversationRepository.findById(channelId)
+                .orElseThrow(() -> new IllegalArgumentException("Channel not found"));
+        User user = userRepository.findById(userId)
+                .orElseThrow(() -> new IllegalArgumentException("User not found"));
+        participantRepository.findByConversationIdAndUserId(channelId, userId)
+                .orElseGet(() -> {
+                    MessageParticipant p = new MessageParticipant();
+                    p.setConversation(channel);
+                    p.setUser(user);
+                    MessageParticipant saved = participantRepository.save(p);
+                    channel.getParticipants().add(saved);
+                    return saved;
+                });
+        return toDto(channel, userId);
+    }
+
+    private ChannelDto toDto(MessageConversation channel, Long userId) {
+        ChannelDto dto = new ChannelDto();
+        dto.setId(channel.getId());
+        dto.setName(channel.getName());
+        dto.setDescription(channel.getDescription());
+        dto.setAvatar(channel.getAvatar());
+        dto.setMemberCount(channel.getParticipants().size());
+        boolean joined = channel.getParticipants().stream()
+                .anyMatch(p -> p.getUser().getId().equals(userId));
+        dto.setJoined(joined);
+        if (joined) {
+            MessageParticipant participant = channel.getParticipants().stream()
+                    .filter(p -> p.getUser().getId().equals(userId))
+                    .findFirst().orElse(null);
+            LocalDateTime lastRead = participant.getLastReadAt() == null
+                    ? LocalDateTime.of(1970, 1, 1, 0, 0)
+                    : participant.getLastReadAt();
+            long unread = messageRepository
+                    .countByConversationIdAndCreatedAtAfterAndSenderIdNot(channel.getId(), lastRead, userId);
+            dto.setUnreadCount(unread);
+        } else {
+            dto.setUnreadCount(0);
+        }
+        return dto;
+    }
+}

backend/src/main/java/com/openisle/service/MessageService.java

@@ -82,6 +82,49 @@ public class MessageService {
         return message;
     }
 
+    @Transactional
+    public Message sendMessageToConversation(Long senderId, Long conversationId, String content) {
+        User sender = userRepository.findById(senderId)
+                .orElseThrow(() -> new IllegalArgumentException("Sender not found"));
+        MessageConversation conversation = conversationRepository.findById(conversationId)
+                .orElseThrow(() -> new IllegalArgumentException("Conversation not found"));
+
+        // Join the conversation if not already a participant (useful for channels)
+        participantRepository.findByConversationIdAndUserId(conversationId, senderId)
+                .orElseGet(() -> {
+                    MessageParticipant p = new MessageParticipant();
+                    p.setConversation(conversation);
+                    p.setUser(sender);
+                    return participantRepository.save(p);
+                });
+
+        Message message = new Message();
+        message.setConversation(conversation);
+        message.setSender(sender);
+        message.setContent(content);
+        message = messageRepository.save(message);
+
+        conversation.setLastMessage(message);
+        conversationRepository.save(conversation);
+
+        MessageDto messageDto = toDto(message);
+        String conversationDestination = "/topic/conversation/" + conversation.getId();
+        messagingTemplate.convertAndSend(conversationDestination, messageDto);
+
+        // Notify all participants except sender for updates
+        for (MessageParticipant participant : conversation.getParticipants()) {
+            if (participant.getUser().getId().equals(senderId)) continue;
+            String userDestination = "/topic/user/" + participant.getUser().getId() + "/messages";
+            messagingTemplate.convertAndSend(userDestination, messageDto);
+
+            long unreadCount = getUnreadMessageCount(participant.getUser().getId());
+            String username = participant.getUser().getUsername();
+            messagingTemplate.convertAndSendToUser(username, "/queue/unread-count", unreadCount);
+        }
+
+        return message;
+    }
+
     private MessageDto toDto(Message message) {
         MessageDto dto = new MessageDto();
         dto.setId(message.getId());
@@ -134,12 +177,18 @@ public class MessageService {
     @Transactional(readOnly = true)
     public List<ConversationDto> getConversations(Long userId) {
         List<MessageConversation> conversations = conversationRepository.findConversationsByUserIdOrderByLastMessageDesc(userId);
-        return conversations.stream().map(c -> toDto(c, userId)).collect(Collectors.toList());
+        return conversations.stream()
+                .filter(c -> !c.isChannel())
+                .map(c -> toDto(c, userId))
+                .collect(Collectors.toList());
     }
 
     private ConversationDto toDto(MessageConversation conversation, Long userId) {
         ConversationDto dto = new ConversationDto();
         dto.setId(conversation.getId());
+        dto.setChannel(conversation.isChannel());
+        dto.setName(conversation.getName());
+        dto.setAvatar(conversation.getAvatar());
         dto.setCreatedAt(conversation.getCreatedAt());
         if (conversation.getLastMessage() != null) {
             dto.setLastMessage(toDto(conversation.getLastMessage()));
@@ -189,6 +238,9 @@ public class MessageService {
 
         ConversationDetailDto detailDto = new ConversationDetailDto();
         detailDto.setId(conversation.getId());
+        detailDto.setName(conversation.getName());
+        detailDto.setChannel(conversation.isChannel());
+        detailDto.setAvatar(conversation.getAvatar());
         detailDto.setParticipants(participants);
         detailDto.setMessages(messageDtoPage);
 

frontend_nuxt/pages/message-box/[id].vue

@@ -1,10 +1,12 @@
 <template>
   <div class="chat-container">
-    <div v-if="!loading && otherParticipant" class="chat-header">
+    <div v-if="!loading" class="chat-header">
       <NuxtLink to="/message-box" class="back-button">
         <i class="fas fa-arrow-left"></i>
       </NuxtLink>
-      <h2 class="participant-name">{{ otherParticipant.username }}</h2>
+      <h2 class="participant-name">
+        {{ isChannel ? conversationName : otherParticipant?.username }}
+      </h2>
     </div>
 
     <div class="messages-list" ref="messagesListEl">
@@ -86,11 +88,13 @@ const currentPage = ref(0)
 const totalPages = ref(0)
 const loadingMore = ref(false)
 let scrollInterval = null
+const conversationName = ref('')
+const isChannel = ref(false)
 
 const hasMoreMessages = computed(() => currentPage.value < totalPages.value - 1)
 
 const otherParticipant = computed(() => {
-  if (!currentUser.value || participants.value.length === 0) {
+  if (isChannel.value || !currentUser.value || participants.value.length === 0) {
     return null
   }
   return participants.value.find((p) => p.id !== currentUser.value.id)
@@ -136,6 +140,8 @@ async function fetchMessages(page = 0) {
 
     if (page === 0) {
       participants.value = conversationData.participants
+      conversationName.value = conversationData.name
+      isChannel.value = conversationData.channel
     }
 
     // Since the backend sorts by descending, we need to reverse for correct chat order
@@ -182,27 +188,40 @@ async function loadMoreMessages() {
 
 async function sendMessage(content, clearInput) {
   if (!content.trim()) return
-
-  const recipient = otherParticipant.value
-  if (!recipient) {
-    toast.error('无法确定收信人')
-    return
-  }
-
   sending.value = true
   const token = getToken()
   try {
-    const response = await fetch(`${API_BASE_URL}/api/messages`, {
-      method: 'POST',
-      headers: {
-        'Content-Type': 'application/json',
-        Authorization: `Bearer ${token}`,
-      },
-      body: JSON.stringify({
-        recipientId: recipient.id,
-        content: content,
-      }),
-    })
+    let response
+    if (isChannel.value) {
+      response = await fetch(
+        `${API_BASE_URL}/api/messages/conversations/${conversationId}/messages`,
+        {
+          method: 'POST',
+          headers: {
+            'Content-Type': 'application/json',
+            Authorization: `Bearer ${token}`,
+          },
+          body: JSON.stringify({ content }),
+        },
+      )
+    } else {
+      const recipient = otherParticipant.value
+      if (!recipient) {
+        toast.error('无法确定收信人')
+        return
+      }
+      response = await fetch(`${API_BASE_URL}/api/messages`, {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json',
+          Authorization: `Bearer ${token}`,
+        },
+        body: JSON.stringify({
+          recipientId: recipient.id,
+          content: content,
+        }),
+      })
+    }
     if (!response.ok) throw new Error('发送失败')
 
     const newMessage = await response.json()

frontend_nuxt/pages/message-box/index.vue

@@ -1,55 +1,104 @@
 <template>
   <div class="messages-container">
-    <div v-if="loading" class="loading-message">
-      <l-hatch size="28" stroke="4" speed="3.5" color="var(--primary-color)"></l-hatch>
+    <div class="tabs">
+      <div :class="['tab', { active: activeTab === 'messages' }]" @click="activeTab = 'messages'">
+        站内信
+      </div>
+      <div :class="['tab', { active: activeTab === 'channels' }]" @click="switchToChannels">
+        频道
+      </div>
     </div>
 
-    <div v-else-if="error" class="error-container">
-      <div class="error-text">{{ error }}</div>
-    </div>
-
-    <div v-if="!loading" class="search-container">
-      <SearchPersonDropdown />
-    </div>
-
-    <div v-if="!loading && conversations.length === 0" class="empty-container">
-      <BasePlaceholder v-if="conversations.length === 0" text="暂无会话" icon="fas fa-inbox" />
-    </div>
-
-    <div
-      v-if="!loading"
-      v-for="convo in conversations"
-      :key="convo.id"
-      class="conversation-item"
-      @click="goToConversation(convo.id)"
-    >
-      <div class="conversation-avatar">
-        <img
-          :src="getOtherParticipant(convo)?.avatar || '/default-avatar.svg'"
-          :alt="getOtherParticipant(convo)?.username || '用户'"
-          class="avatar-img"
-          @error="handleAvatarError"
-        />
+    <div v-if="activeTab === 'messages'">
+      <div v-if="loading" class="loading-message">
+        <l-hatch size="28" stroke="4" speed="3.5" color="var(--primary-color)"></l-hatch>
       </div>
 
-      <div class="conversation-content">
-        <div class="conversation-header">
-          <div class="participant-name">
-            {{ getOtherParticipant(convo)?.username || '未知用户' }}
-          </div>
-          <div class="message-time">
-            {{ formatTime(convo.lastMessage?.createdAt || convo.createdAt) }}
-          </div>
+      <div v-else-if="error" class="error-container">
+        <div class="error-text">{{ error }}</div>
+      </div>
+
+      <div v-if="!loading" class="search-container">
+        <SearchPersonDropdown />
+      </div>
+
+      <div v-if="!loading && conversations.length === 0" class="empty-container">
+        <BasePlaceholder v-if="conversations.length === 0" text="暂无会话" icon="fas fa-inbox" />
+      </div>
+
+      <div
+        v-if="!loading"
+        v-for="convo in conversations"
+        :key="convo.id"
+        class="conversation-item"
+        @click="goToConversation(convo.id)"
+      >
+        <div class="conversation-avatar">
+          <img
+            :src="getOtherParticipant(convo)?.avatar || '/default-avatar.svg'"
+            :alt="getOtherParticipant(convo)?.username || '用户'"
+            class="avatar-img"
+            @error="handleAvatarError"
+          />
         </div>
 
-        <div class="last-message-row">
-          <div class="last-message">
-            {{
-              convo.lastMessage ? stripMarkdownLength(convo.lastMessage.content, 100) : '暂无消息'
-            }}
+        <div class="conversation-content">
+          <div class="conversation-header">
+            <div class="participant-name">
+              {{ getOtherParticipant(convo)?.username || '未知用户' }}
+            </div>
+            <div class="message-time">
+              {{ formatTime(convo.lastMessage?.createdAt || convo.createdAt) }}
+            </div>
           </div>
-          <div v-if="convo.unreadCount > 0" class="unread-count-badge">
-            {{ convo.unreadCount }}
+
+          <div class="last-message-row">
+            <div class="last-message">
+              {{
+                convo.lastMessage ? stripMarkdownLength(convo.lastMessage.content, 100) : '暂无消息'
+              }}
+            </div>
+            <div v-if="convo.unreadCount > 0" class="unread-count-badge">
+              {{ convo.unreadCount }}
+            </div>
+          </div>
+        </div>
+      </div>
+    </div>
+
+    <div v-else>
+      <div v-if="loadingChannels" class="loading-message">
+        <l-hatch size="28" stroke="4" speed="3.5" color="var(--primary-color)"></l-hatch>
+      </div>
+      <div v-else>
+        <div v-if="channels.length === 0" class="empty-container">
+          <BasePlaceholder text="暂无频道" icon="fas fa-inbox" />
+        </div>
+        <div
+          v-for="ch in channels"
+          :key="ch.id"
+          class="conversation-item"
+          @click="goToChannel(ch.id)"
+        >
+          <div class="conversation-avatar">
+            <img
+              :src="ch.avatar || '/default-avatar.svg'"
+              :alt="ch.name"
+              class="avatar-img"
+              @error="handleAvatarError"
+            />
+          </div>
+          <div class="conversation-content">
+            <div class="conversation-header">
+              <div class="participant-name">
+                {{ ch.name }}
+                <span v-if="ch.unreadCount > 0" class="unread-dot"></span>
+              </div>
+              <div class="message-time">成员 {{ ch.memberCount }}</div>
+            </div>
+            <div class="last-message-row">
+              <div class="last-message">{{ ch.description }}</div>
+            </div>
           </div>
         </div>
       </div>
@@ -80,6 +129,10 @@ const { connect, disconnect, subscribe, isConnected } = useWebSocket()
 const { fetchUnreadCount: refreshGlobalUnreadCount } = useUnreadCount()
 let subscription = null
 
+const activeTab = ref('messages')
+const channels = ref([])
+const loadingChannels = ref(false)
+
 async function fetchConversations() {
   const token = getToken()
   if (!token) {
@@ -120,6 +173,50 @@ function handleAvatarError(event) {
   event.target.src = '/default-avatar.svg'
 }
 
+async function fetchChannels() {
+  const token = getToken()
+  if (!token) {
+    toast.error('请先登录')
+    return
+  }
+  loadingChannels.value = true
+  try {
+    const response = await fetch(`${API_BASE_URL}/api/channels`, {
+      headers: { Authorization: `Bearer ${token}` },
+    })
+    if (!response.ok) throw new Error('无法加载频道')
+    channels.value = await response.json()
+  } catch (e) {
+    toast.error(e.message)
+  } finally {
+    loadingChannels.value = false
+  }
+}
+
+function switchToChannels() {
+  activeTab.value = 'channels'
+  if (channels.value.length === 0) {
+    fetchChannels()
+  }
+}
+
+async function goToChannel(id) {
+  const token = getToken()
+  if (!token) {
+    toast.error('请先登录')
+    return
+  }
+  try {
+    await fetch(`${API_BASE_URL}/api/channels/${id}/join`, {
+      method: 'POST',
+      headers: { Authorization: `Bearer ${token}` },
+    })
+    router.push(`/message-box/${id}`)
+  } catch (e) {
+    toast.error(e.message)
+  }
+}
+
 onActivated(async () => {
   loading.value = true
   currentUser.value = await fetchCurrentUser()
@@ -169,6 +266,22 @@ function goToConversation(id) {
   padding: 20px;
 }
 
+.tabs {
+  display: flex;
+  border-bottom: 1px solid var(--normal-border-color);
+  margin-bottom: 16px;
+}
+
+.tab {
+  padding: 8px 16px;
+  cursor: pointer;
+}
+
+.tab.active {
+  font-weight: 600;
+  border-bottom: 2px solid var(--primary-color);
+}
+
 .loading-message {
   display: flex;
   justify-content: center;
@@ -291,6 +404,15 @@ function goToConversation(id) {
   flex-shrink: 0;
 }
 
+.unread-dot {
+  display: inline-block;
+  width: 8px;
+  height: 8px;
+  background-color: #f56c6c;
+  border-radius: 50%;
+  margin-left: 4px;
+}
+
 /* 响应式设计 */
 @media (max-width: 768px) {
   .messages-container {