ajax聊天室(JSP版)3

最新推荐文章于 2025-08-21 21:29:08 发布

转载最新推荐文章于 2025-08-21 21:29:08 发布 · 1.4k 阅读

文章标签：

#聊天 #ajax #jsp #user #string #xml

动态交互语言Ajax 专栏收录该内容

23 篇文章

订阅专栏

本文介绍了一个基于Java的聊天室管理系统的设计与实现。该系统利用ChatroomManager类来管理多个聊天室，每个聊天室包含用户和消息。通过配置XML文件初始化聊天室参数，并提供了一系列方法来操作房间、用户和消息。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

有了以上三个javabean，只是==有了三个数据表（事实上，如果要保存聊天信息在数据库中，建立表进行插入删除更新即可），还要有掌控全局的ChatroomManager类。下面先给出完整代码。

--------------------------------------------------------------------------------

package org.jvk.chatroom.service;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.digester.Digester;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jvk.chatroom.bean.Message;
import org.jvk.chatroom.bean.Room;
import org.jvk.chatroom.bean.User;

import org.xml.sax.SAXException;

publicclass ChatroomManager {
    private static Log log = LogFactory.getLog(ChatroomManager.class);
    private ChatroomManager() {
    }
    private static ChatroomManager instance = new ChatroomManager();
    private Map<String, Room> rooms = new HashMap<String, Room>();
    public static ChatroomManager newInstance() {
       return instance;
    }

    public synchronized void config(FileInputStream in) throws IOException, SAXException{
       log.info("初始化聊天室配置信息");
       Digester digester = new Digester();
       digester.setValidating(false);
       digester.push(this);
       digester.addObjectCreate("rooms/room", Room.class);
       digester.addBeanPropertySetter("rooms/room/name", "name");
       digester.addBeanPropertySetter("rooms/room/notice", "notice");
       digester.addBeanPropertySetter("rooms/room/maxMessage", "maxMessage");
       digester.addBeanPropertySetter("rooms/room/maxUser", "maxUser");
       digester.addSetNext("rooms/room", "addRoom");
       digester.parse(in);
       log.info("聊天室配置信息初始化完毕");
    }

    public synchronized void config(File file) throws IOException{
       log.info("聊天室配置文件:"+file.getAbsolutePath());
       config(new FileInputStream(file));
    }

    public Map<String, Room> getRooms() {
       return rooms;
    }

    public void setRooms(Map<String, Room> rooms) {
       this.rooms = rooms;
    }

    public Room getRoom(String roomName) {
       return rooms.get(roomName);
    }

    public Room getRoom(User user) {
       return user.getRoom();
    }

    public void addRoom(Room room) {
       rooms.put(room.getName(), room);
    }

    public void addUserToRoom(User user) {
       rooms.get(user.getRoom().getName()).addUser(user);
    }

    public void removeUserFromRoom(User user) {
       rooms.get(user.getRoom().getName()).removeUser(user);
    }

    public void addMessageToRoom(Message message, Room room) {
       rooms.get(room.getName()).addMessage(message);
    }

    public List<Message> getMessagesFromRoom(User user) {
       return user.getRoom().getMessages(user);
    }

    public List<User> getUsersFromRoom(User user) {
       return getRoom(user).getUsers(user);
    }

    public boolean exists(String roomName, String userName) {
       Room room = getRoom(roomName);
       for (User user : room.getUsers())
           if (user.getName().equalsIgnoreCase(userName))
              returnt rue;
       return false;
    }

    public boolean exists(Room room, String userName) {
       for (User user : room.getUsers())
           if (user.getName().equalsIgnoreCase(userName))
              return true;
       return false;
    }
}

--------------------------------------------------------------------------------

其中 config(FileInputStream in) 方法通过读取配置文件初始化聊天室。配置文件是一个XML格式文件，解析XML文件时使用了commons-digester 包的Digester。Digester可以让我们轻易地把XML转换为Java对象。（详情请访问http://commons.apache.org/digester/）。
从以下的java代码
       digester.addObjectCreate("rooms/room", Room.class);
       digester.addBeanPropertySetter("rooms/room/name", "name");
       digester.addBeanPropertySetter("rooms/room/notice", "notice");
       digester.addBeanPropertySetter("rooms/room/maxMessage", "maxMessage");
       digester.addBeanPropertySetter("rooms/room/maxUser", "maxUser");
       digester.addSetNext("rooms/room", "addRoom");
可以猜到XML配置文件是这样的：
<?xml version="1.0" encoding="GBK"?>
<rooms>
    <room>
       <name>我的聊天室</name>
       <notice>欢迎交流学习</notice>
       <maxMessage>10</maxMessage>
       <maxUser>100</maxUser>
    </room>
    <room>
       <name>你的聊天室</name>
       <notice>欢迎交流娱乐</notice>
       <maxMessage>15</maxMessage>
       <maxUser>150</maxUser>
    </room>
</rooms>

这个类除了读取配置文件进行初始化外，还担当“门面模式”的角色，以后不管如何操作Message、User和Room三个类，都通过ChatroomManager间接进行。
因为Room对象包含了User和Message，所以这里只需要一个Room的集合：
    private Map<String, Room> rooms = new HashMap<String, Room>();
只要有Room在手，一切掌握之中。