一套简单的web即时通讯——第二版

　　前言

　　接上一版，这一版的页面与功能都有所优化，具体如下：

　　1、优化登录拦截

　　2、登录后获取所有好友并区分显示在线、离线好友，好友上线、下线都有标记

　　3、将前后端交互的值改成用户id、显示值改成昵称nickName

　　4、聊天消息存储，点击好友聊天，先追加聊天记录

　　5、登录后获取所有未读消息并以小圆点的形式展示

　　6、搜索好友、添加好友

 

　　优化细节

　   1、登录拦截由之前的通过路径中获取账号，判断WebSocketServer.loginList中是否存在key改成登录的时候设置cookie，登录拦截从cookie中取值

　　登录、登出的时候设置、删除cookie，

    /**
     * 登录
     */
    @PostMapping("login")
    public Result<ImsUserVo> login(ImsUserVo userVo, HttpServletResponse response) {
        //加密后再去对比密文
        userVo.setPassword(MD5Util.getMD5(userVo.getPassword()));
        Result<List<ImsUserVo>> result = list(userVo);
        if (result.isFlag() && result.getData().size() > 0) {
            ImsUserVo imsUserVo = result.getData().get(0);
            //置空隐私信息
            imsUserVo.setPassword(null);

            //add WebSocketServer.loginList
            WebSocketServer.loginList.put(imsUserVo.getUserName(), imsUserVo);

            //设置cookie
            Cookie cookie = new Cookie("imsLoginToken", imsUserVo.getUserName());
            cookie.setMaxAge(60 * 30);
            //设置域
//          cookie.setDomain("huanzi.cn");
            //设置访问路径
            cookie.setPath("/");
            response.addCookie(cookie);

            return Result.of(imsUserVo);
        } else {
            return Result.of(null, false, "账号或密码错误！");
        }
    }

    /**
     * 登出
     */
    @RequestMapping("logout/{username}")
    public ModelAndView loginOut(HttpServletResponse response, @PathVariable String username) {
        new WebSocketServer().deleteUserByUsername(username,response);
        return new ModelAndView("login.html");
    }

　　改成关闭websocket时不做操作，仅减减socket连接数

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose(Session session) {
        //下线用户名
        String logoutUserName = "";

        //从webSocketMap删除下线用户
        for (Entry<String, Session> entry : sessionMap.entrySet()) {
            if (entry.getValue() == session) {
                sessionMap.remove(entry.getKey());
                logoutUserName = entry.getKey();
                break;
            }
        }
        deleteUserByUsername(logoutUserName,null);
    }

    /**
        用户下线
     */
    public void deleteUserByUsername(String username, HttpServletResponse response){
        //在线人数减减
        WebSocketServer.onlineCount--;
        if(WebSocketServer.onlineCount <= 0){
            WebSocketServer.onlineCount = 0;
        }

        if(StringUtils.isEmpty(response)){
            return;
        }

        //用户集合delete
        WebSocketServer.loginList.remove(username);

        //删除cookie 思路就是替换原来的cookie,并设置它的生存时间为0
        //设置cookie
        Cookie cookie = new Cookie("imsLoginToken", username);
        cookie.setMaxAge(0);
        //设置域
//      cookie.setDomain("huanzi.cn");
        //设置访问路径
        cookie.setPath("/");
        response.addCookie(cookie);

        //通知除了自己之外的所有人
        sendOnlineCount(username, "{'type':'onlineCount','onlineCount':" + WebSocketServer.onlineCount + ",username:'" + username + "'}");
    }

　　在登录拦截器中从cookie取用户账户

        //其实存的是用户账号
        String imsLoginToken = "";
        Cookie[] cookies = request.getCookies();
        if (null != cookies) {
            for (Cookie cookie : cookies) {
                if ("imsLoginToken".equals(cookie.getName())) {
                    imsLoginToken = cookie.getValue();
                }
            }
        }

        if(WebSocketServer.loginList.containsKey(imsLoginToken)){
            //正常处理请求
            filterChain.doFilter(servletRequest, servletResponse);
        }else{
            //重定向登录页面
            response.sendRedirect("/imsUser/loginPage.html");
        }

　　

　　2、登录之后的用户列表不再是显示websocket连接的用户，而是登录用户的好友，同时要区分显示好友的在线与离线，所以新增一个获取在线好友的接口

    /**
     * 获取在线好友
     */
    @PostMapping("getOnlineList")
    private Result<List<ImsUserVo>> getOnlineList(ImsFriendVo imsFriendVo) {
        return imsFriendService.getOnlineList(imsFriendVo);
    }


   /**
     * 获取在线好友
     */
    @Override
    public Result<List<ImsUserVo>> getOnlineList(ImsFriendVo imsFriendVo) {
        //好友列表
        List<ImsFriendVo> friendList = list(imsFriendVo).getData();

        //在线好友列表
        ArrayList<ImsUserVo> onlineFriendList = new ArrayList<>();

        //遍历friendList
        for(ImsFriendVo imsFriendVo1 : friendList){
            ImsUserVo imsUserVo = imsFriendVo1.getUser();
            if (!StringUtils.isEmpty(WebSocketServer.getSessionMap().get(imsUserVo.getId().toString()))) {
                onlineFriendList.add(imsUserVo);
            }
        }
        return Result.of(onlineFriendList);
    }

//连接成功建立的回调方法
websocket.onopen = function () {
    //获取好友列表
    // $.post(ctx + "/imsFriend/list",{userId: username},function (data) {
    //     console.log(data)
    // });
    $.ajax({
        type: 'post',
        url: ctx + "/imsFriend/list",
        contentType: 'application/x-www-form-urlencoded; charset=UTF-8',
        dataType: 'json',
        data: {userId: user.id},
        success: function (data) {
            if (data.flag) {
                //列表
                let friends = data.data;
                for (let i = 0; i < friends.length; i++) {
                    let friend = friends[i].user;
                    let $friendGroupList = $("<div class=\"hz-group-list\">" +
                                    "<img class='left' style='width: 23px;' src='https://avatars3.githubusercontent.com/u/31408183?s=40&v=4'/>" +
                                    "<span class='hz-group-list-username'>" + friend.nickName + "</span><span id=\"" + friend.id + "-status\" style='color: #9c0c0c;;'>[离线]</span>" +
                                    "<div id=\"hz-badge-" + friend.id + "\" class='hz-badge'>0</div>" +
                                  "</div>");
                    $friendGroupList.user = friend;
                    $("#hz-group-body").append($friendGroupList);
                }

                //好友人数
                $("#friendCount").text(friends.length);

                getOnlineList(user.id);
            }
        },
        error: function (xhr, status, error) {
            console.log("ajax错误！");
        }
    });
};

/**
 * 获取在线好友
 */
function getOnlineList(userId){
    $.ajax({
        type: 'post',
        url: ctx + "/imsFriend/getOnlineList",
        contentType: 'application/x-www-form-urlencoded; charset=UTF-8',
        dataType: 'json',
        data: {userId: userId},
        success: function (data) {
            if (data.flag) {
                //列表
                let onlineFriends = data.data;
                for (let i = 0; i < onlineFriends.length; i++) {
                    let friend = onlineFriends[i];
                    $("#" + friend.id + "-status").text("[在线]");
                    $("#" + friend.id + "-status").css("color", "#497b0f");
                }
                //好友人数
                $("#onlineCount").text(onlineFriends.length);
            }
        },
        error: function (xhr, status, error) {
            console.log("ajax错误！");
        }
    });
}

 

　　3、将之前前后端传递用户账户username改成用户id，同时，显示的是nickName昵称，改动的地方比较多，我就不贴代码了

 

 　　4、消息存储 

 　　后端存储关键代码

    /**
     * 服务器接收到客户端消息时调用的方法
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        try {
            //JSON字符串转 HashMap
            HashMap hashMap = new ObjectMapper().readValue(message, HashMap.class);

            //消息类型
            String type = (String) hashMap.get("type");

            //来源用户
            Map srcUser = (Map) hashMap.get("srcUser");

            //目标用户
            Map tarUser = (Map) hashMap.get("tarUser");

            //如果点击的是自己，那就是群聊
            if (srcUser.get("userId").equals(tarUser.get("userId"))) {
                //群聊
                groupChat(session,hashMap);
            } else {
                //私聊
                privateChat(session, tarUser, hashMap);
            }

            //后期要做消息持久化
            ImsFriendMessageVo imsFriendMessageVo = new ImsFriendMessageVo();
            imsFriendMessageVo.setToUserId((Integer) tarUser.get("userId"));
            imsFriendMessageVo.setFromUserId((Integer) srcUser.get("userId"));
            //聊天内容
            imsFriendMessageVo.setContent(hashMap.get("message").toString());
            try {
                SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                imsFriendMessageVo.setCreatedTime(simpleDateFormat.parse(hashMap.get("date").toString()));
                imsFriendMessageVo.setUpdataTime(simpleDateFormat.parse(hashMap.get("date").toString()));
            } catch (ParseException e) {
                e.printStackTrace();
            }
            imsFriendMessageService.save(imsFriendMessageVo);

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

　　前端点击好友时，获取聊天记录关键代码

    //读取聊天记录
    $.post(ctx + "/imsFriendMessage/getChattingRecords", {
        fromUserId: userId,
        toUserId: toUserId
    }, function (data) {
        if (data.flag) {
            for (let i = 0; i < data.data.length; i++) {
                let msgObj = data.data[i];

                //当聊天窗口与msgUserName的人相同，文字在左边（对方/其他人），否则在右边（自己）
                if (msgObj.fromUserId === userId) {
                    //追加聊天数据
                    setMessageInnerHTML({
                        id: msgObj.id,
                        isRead: msgObj.isRead,
                        toUserId: msgObj.toUserId,
                        fromUserId: msgObj.fromUserId,
                        message: msgObj.content,
                        date: msgObj.createdTime
                    });
                } else {
                    //追加聊天数据
                    setMessageInnerHTML({
                        id: msgObj.id,
                        isRead: msgObj.isRead,
                        toUserId: msgObj.fromUserId,
                        message: msgObj.content,
                        date: msgObj.createdTime
                    });
                }
            }
        }
    });

    /**
     * 获取A-B的聊天记录
     */
    @RequestMapping("getChattingRecords")
    public Result<List<ImsFriendMessageVo>> getChattingRecords(ImsFriendMessageVo imsFriendMessageVo){
        return imsFriendMessageService.getChattingRecords(imsFriendMessageVo);
    }

    @Override
    public Result<List<ImsFriendMessageVo>> getChattingRecords(ImsFriendMessageVo imsFriendMessageVo) {
        //A对B的聊天记录
        List<ImsFriendMessageVo> allList = new ArrayList<>(super.list(imsFriendMessageVo).getData());
        Integer fromUserId = imsFriendMessageVo.getFromUserId();
        imsFriendMessageVo.setFromUserId(imsFriendMessageVo.getToUserId());
        imsFriendMessageVo.setToUserId(fromUserId);
        //B对A的聊天记录
        allList.addAll(super.list(imsFriendMessageVo).getData());
        //默认按时间排序
        allList.sort(Comparator.comparingLong(vo -> vo.getCreatedTime().getTime()));
        return Result.of(allList);
    }

 

 

　　5、登录后获取所有未读消息并以小圆点的形式展示

　　登录成功后获取与好友的未读消息关键代码，在获取好友列表之后调用

                //获取未读消息
                $.post(ctx + "/imsFriendMessage/list",{toUserId:userId,isRead:0},function(data){
                    if(data.flag){
                        let friends = {};

                        //将fromUser合并
                        for (let i = 0; i < data.data.length; i++) {
                            let fromUser = data.data[i];

                            if(!friends[fromUser.fromUserId]){
                                friends[fromUser.fromUserId] = {};
                                friends[fromUser.fromUserId].count = 1;
                            }else{
                                friends[fromUser.fromUserId].count = friends[fromUser.fromUserId].count + 1;
                            }
                        }

                        for (let key in friends) {
                            let fromUser = friends[key];
                            //小圆点++
                            $("#hz-badge-" + key).text(fromUser.count);
                            $("#hz-badge-" + key).css("opacity", "1");
                        }
                    }
                });

 

　　6、搜索好友、添加好友

　　可按照账号、昵称进行搜索，其中账号是等值查询，昵称是模糊查询

　　关键代码

//搜索好友
function findUserByUserNameOrNickName() {
    let userNameOrNickName = $("#userNameOrNickName").val();
    if (!userNameOrNickName) {
        tip.msg("账号/昵称不能为空");
        return;
    }

    $.post(ctx + "/imsUser/findUserByUserNameOrNickName", {
        userName: userNameOrNickName,
        nickName: userNameOrNickName,
    }, function (data) {
        if (data.flag) {
            $("#friendList").empty();
            for (let i = 0; i < data.data.length; i++) {
                let user = data.data[i];
                let $userDiv = $("<div>" +
                    "<img style='width: 23px;margin: 0 5px 0 0;' src='" + user.avatar + "'/>" +
                    "<span>" + user.nickName + "（" + user.userName + "）</span>" +
                    "<button onclick='tipUserInfo($(this).parent()[0].user)'>用户详情</button>" +
                    "<button onclick=''>加好友</button>" +
                    "</div>");
                $userDiv[0].user = user;
                $("#friendList").append($userDiv);
            }
        }
    });
}

    /**
     * 根据账号或昵称（模糊查询）查询
     */
    @PostMapping("findUserByUserNameOrNickName")
    public Result<List<ImsUserVo>> findUserByUserNameOrNickName(ImsUserVo userVo) {
        return imsUserService.findUserByUserNameOrNickName(userVo);
    }


    @Override
    public Result<List<ImsUserVo>> findUserByUserNameOrNickName(ImsUserVo userVo) {
        return Result.of(CopyUtil.copyList(imsUserRepository.findUserByUserNameOrNickName(userVo.getUserName(), userVo.getNickName()), ImsUserVo.class));
    }


    @Query(value = "select * from ims_user where user_name = :userName or nick_name like %:nickName%",nativeQuery = true)
    List<ImsUser> findUserByUserNameOrNickName(@Param("userName") String userName,@Param("nickName") String nickName);

 　　添加好友

　　首先要修改ims_friend结构，SQL如下，添加了一个字段is_agree，是否已经同意好友申请 0已申请但未同意 1同意 -1拒绝，之前查询好友列表的post请求则需要新增参数isAgree=1

/*
 Navicat Premium Data Transfer

 Source Server         : localhost
 Source Server Type    : MySQL
 Source Server Version : 50528
 Source Host           : localhost:3306
 Source Schema         : test

 Target Server Type    : MySQL
 Target Server Version : 50528
 File Encoding         : 65001

 Date: 14/05/2019 17:25:35
*/

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for ims_friend
-- ----------------------------
DROP TABLE IF EXISTS `ims_friend`;
CREATE TABLE `ims_friend`  (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '自增主键',
  `user_id` int(11) NULL DEFAULT NULL COMMENT '用户id',
  `friend_id` int(11) NULL DEFAULT NULL COMMENT '好友id',
  `friend_type` int(11) NULL DEFAULT NULL COMMENT '好友分组id',
  `friend_remark` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '好友备注',
  `is_agree` int(1) NULL DEFAULT NULL COMMENT '是否已经同意好友申请 0已申请但未同意 1同意 -1拒绝',
  `created_time` datetime NULL DEFAULT NULL COMMENT '创建时间',
  `updata_time` datetime NULL DEFAULT NULL COMMENT '更新时间',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 9 CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = '好友表' ROW_FORMAT = Compact;

SET FOREIGN_KEY_CHECKS = 1;

　　在工具栏新加一个系统消息，贴出对应关键代码

//监听单击系统消息，弹出窗口
$("body").on("click", "#sysNotification", function () {
    //此处为单击事件要执行的代码
    if ($(".sysNotification").length <= 0) {
        tip.dialog({
            title: "系统消息",
            class: "sysNotification",
            content: "<div></div>",
            shade: 0
        });
    } else {
        $(".sysNotification").click();
    }
    $("#sysNotification").find(".hz-badge").css("opacity",0);
    $("#sysNotification").find(".hz-badge").text(0);

    //已拒绝

    //申请好友
    $.post(ctx + "/imsFriend/list", {
        friendId: userId,
        isAgree: 0,
    }, function (data) {
        if (data.flag) {
            for (let i = 0; i < data.data.length; i++) {
                let user = data.data[i].user;
                let $userDiv = $("<div>" +
                    "<img style='width: 23px;margin: 0 5px 0 0;' src='" + user.avatar + "'/>" +
                    "<span>" + user.nickName + "（" + user.userName + "）</span> 申请添加好友<br/>" +
                    "<button onclick='tipUserInfo($(this).parent()[0].user)'>用户详情</button>" +
                    "<button onclick='agreeAddFriend(" + data.data[i].id + ")'>同意</button>" +
                    "</div>");
                $userDiv[0].user = user;
                $(".sysNotification .tip-content").append($userDiv);
            }
        }
    });
});

//申请添加好友
function applyToAddFriend(friendUserId) {
    let nowTime = commonUtil.getNowTime();
    $.post(ctx + "/imsFriend/save", {
        userId: userId,
        friendId: friendUserId,
        friendType: 1,
        friendRemark: "",
        isAgree: 0,
        createdTime: nowTime,
        updataTime: nowTime,
    }, function (data) {
        if (data.flag) {
            tip.msg({text:"已为你递交好友申请，对方同意好即可成为好友！",time:3000});
        }
    });
}

//同意好友添加
function agreeAddFriend(id){
    let nowTime = commonUtil.getNowTime();
    $.post(ctx + "/imsFriend/save", {
        id:id,
        isAgree: 1,
        updataTime: nowTime,
    }, function (data) {
        if (data.flag) {
            $.post(ctx + "/imsFriend/save", {
                userId: data.data.friendId,
                friendId: data.data.userId,
                friendType: 1,
                friendRemark: "",
                isAgree: 1,
                createdTime: nowTime,
                updataTime: nowTime,
            }, function (data) {
                if (data.flag) {
                    tip.msg({text:"你们已经是好友了，可以开始聊天！",time:2000});
                }
            });
        }
    });
}

//获取我的申请好友，并做小圆点提示
function getApplyFriend(userId){
    $.post(ctx + "/imsFriend/list", {
        friendId: userId,
        isAgree: 0,
    }, function (data) {
        if (data.flag && data.data.length > 0) {
            $("#sysNotification").find(".hz-badge").css("opacity",1);
            $("#sysNotification").find(".hz-badge").text(data.data.length);
        }
    });
}

　　在线、离线提示出来小bug...

　　

　　2019-05-17更新

　　问题找到了，是因为我们将关联的好友对象属性名改成了

    @OneToOne
    @JoinColumn(name = "friendId",referencedColumnName = "id", insertable = false, updatable = false)
    @NotFound(action= NotFoundAction.IGNORE)
    private ImsUser friendUser;//好友

　　但在获取在线好友那里还是，getUser();，导致数据错乱，bug修改：改成getFriendUser();即可

/**
     * 获取在线好友
     */
    @Override
    public Result<List<ImsUserVo>> getOnlineList(ImsFriendVo imsFriendVo) {
        imsFriendVo.setIsAgree(1);
        //好友列表
        List<ImsFriendVo> friendList = list(imsFriendVo).getData();

        //在线好友列表
        ArrayList<ImsUserVo> onlineFriendList = new ArrayList<>();

        //遍历friendList
        for(ImsFriendVo imsFriendVo1 : friendList){
            ImsUserVo imsUserVo = imsFriendVo1.getUser();
            if (!StringUtils.isEmpty(WebSocketServer.getSessionMap().get(imsUserVo.getId().toString()))) {
                onlineFriendList.add(imsUserVo);
            }
        }
        return Result.of(onlineFriendList);
    }

 

 

　　后记

　　第二版暂时记录到这，第三版持续更新中...

　　2019-06-18补充：HashMap不支持并发操作，线程不安全，ConcurrentHashMap支持并发操作线程安全，因此，我们应该用后者，而不是前者，今天在这里补充一下，就不再其他地方做补充说明了

　　PS：ConcurrentHashMap是一个 Segment 数组，Segment 通过继承 ReentrantLock 来进行加锁，所以每次需要加锁的操作锁住的是一个 segment，这样只要保证每个 Segment 是线程安全的，也就实现了全局的线程安全。