SSM框架下使用websocket实现后端发送消息至前端

本篇文章本人是根据实际项目需求进行书写的第一版,里面有些内容对大家或许没有用,但是核心代码本人已对其做了红色标注。文章讲解我将从maven坐标、HTML页面、js文件及后端代码一起书写。

一、maven坐标

<!-- WebSocket配置开始-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-websocket</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-messaging</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- WebSocket配置结束-->

二、HTML页面

<!--消息框开始&ndash;-->
<!-- 弹窗&ndash;&gt-->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<link rel="stylesheet" type="text/css" href="${basePath}/static/css/home/index.css">
<script src="${basePath}/static/js/common/jquery-1.8.3.min.js"></script>
<script src="${basePath}/static/js/home/index.js"></script>
<script src="${basePath}/static/css/layui/layui.js"></script>
<title>后台管理系统</title>
</head>
<body>
<input type="hidden" value="${userId}" id="userId">
<input type="hidden" value="${cnName}" id="cnName">
<div class="tanchuang">
<div class="tanchuangClose"><span class="tanchuangCloseBtn">关闭</span></div>
<h6>消息提示:</h6>
<div id="messages"></div>
</div>
<!--消息框结束&ndash;-->
<script src="${basePath}/static/js/home/index.js"></script>
<script src="/static/js/webSocket.js"></script>
</body>
</html>

三、js文件(websocket.js)

var websocket;
// var host = document.location.host;
var userId = $("#userId").val(); // 获得当前登录人员的userName
var cnName=$("#cnName").val();
// alert(username)
//判断当前浏览器是否支持WebSocket
if ('WebSocket' in window) {
// alert("浏览器支持Websocket")
if(websocket ==null){
//以下用的是ip路径,那么在本地启动项目时也需要使用ip地址进行访问
websocket = new WebSocket("ws://192.168.200.102:8080/webSocket/"+userId+"/"+cnName);
}
} else {
alert('当前浏览器 Not support websocket')
}
//连接发生错误的回调方法
websocket.onerror = function() {
// setMessageInnerHTML("WebSocket连接发生错误");
};
//连接成功建立的回调方法
websocket.onopen = function() {
// alert("WebSocket连接成功")
// setMessageInnerHTML("WebSocket连接成功");
}
//接收到消息的回调方法
websocket.onmessage = function(event) {
// alert("接收到消息的回调方法")
$('.tanchuang').css('display','block')
// alert("这是后台推送的消息:"+event.data);
$("#messages").append(event.data + '<br/>') ;
// websocket.close();
// alert("webSocket已关闭!")
}
//连接关闭的回调方法
websocket.onclose = function() {
// setMessageInnerHTML("WebSocket连接关闭");
} //监听窗口关闭事件,当窗口关闭时,主动去关闭websocket连接,防止连接还没断开就关闭窗口,server端会抛异常。
/*window.onbeforeunload = function() {
closeWebSocket();
}*/
//关闭WebSocket连接
function closeWebSocket() {
websocket.close();
}
//将消息显示在网页上
function setMessageInnerHTML(innerHTML) {
document.getElementById('messages').innerHTML += innerHTML + '<br/>';
}

四、websocket连接控制器

package com.yjlc.platform.utils.webSocket;

import com.alibaba.fastjson.JSON;
import com.yjlc.platform.User;
import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap; /**
* --------------------------------------------------------------
* CopyRights(c)2018,YJLC
* All Rights Reserved
* <p>
* FileName: WebSockets.java
* Description:(该处未使用配置类)使用配置类后才可以在该类中进行service的注解注入
* Author: cyb
* CreateDate: 2018-11-28
* --------------------------------------------------------------
*/
@ServerEndpoint("/webSocket/{userId}/{cnName}")
public class WebSockets {
private static int onlineCount = 0;
public static Map<User, WebSockets> clients = new ConcurrentHashMap<User, WebSockets>();
private Session session;
private Long userId;//用户id
private String cnName;//用户真实名称
private User user;//用户实体
public static List<User> list = new ArrayList<>(); //在线列表,记录用户名称 /**
*@description: 连接websocket
*@author:cyb
*@date: 2018-12-03 19:12
*@param: userId 用户id
*@param: cnName 用户真实名称
*@param: session
*@return: void
*/
@OnOpen
public void onOpen(@PathParam("userId") Long userId,@PathParam("cnName") String cnName, Session session) throws IOException {
this.userId = userId;
this.session = session;
this.cnName=cnName;
System.out.println("cnName:"+cnName+"userId"+userId);
user= new User();
user.setUserId(userId);
user.setCnName(cnName);
list.add(user);
addOnlineCount();//添加在线人数
clients.put(user, this);
/* String message = getMessage("["+cnName+"]进入聊天室,当前在线人数为"+getOnlineCount()+"位", "notice", list);
broadcast(message);//调用广播
System.out.println("已连接");*/
}
/**
* 广播消息
* @param message
*/
public void broadcast(String message){
for (WebSockets item : clients.values()) {
String cnName = item.cnName;
//
String msg = message.replace("{userName}",cnName);
item.session.getAsyncRemote().sendText(msg);
}
}
/**
* 组装返回给前台的消息
* @param message 交互信息
* @param type 信息类型
* @param list 在线列表
* @return
*/
public String getMessage(String message, String type, List list){
com.alibaba.fastjson.JSONObject member = new com.alibaba.fastjson.JSONObject();
member.put("message", message);
member.put("type", type);
member.put("list", list);
return member.toString();
}
/**
* 对特定用户发送消息
* @param message
* @param session
*/
public void singleSend(String message, Session session){
try {
session.getBasicRemote().sendText(message);
} catch (IOException e) {
e.printStackTrace();
}
}
/**
*@description: 关闭连接
*@author:cyb
*@date: 2018-12-03 14:33
*@param:
*@return: void
*/
@OnClose
public void onClose() throws IOException {
System.out.println("关闭当前用户连接:"+user.getCnName());
clients.remove(user);
list.remove(user); //从在线列表移除这个用户
subOnlineCount();
}
/**
*@description:前台发送过来的消息
*@author:cyb
*@date: 2018-12-03 14:33
*@param: _message
*@return: void
*/
@OnMessage
public void onMessage(String _message) throws IOException {
com.alibaba.fastjson.JSONObject chat = JSON.parseObject(_message);
com.alibaba.fastjson.JSONObject message = JSON.parseObject(chat.get("message").toString());
if(message.get("to") == null || message.get("to").equals("")){
//如果to为空,则广播;如果不为空,则对指定的用户发送消息
broadcast(_message);
}else{
String [] userlist = message.get("to").toString().split(",");
sendMessageTo(_message,message.get("from").toString());
// singleSend(_message, (Session) routetab.get(message.get("from"))); //发送给自己
}
}
@OnError
public void onError(Session session, Throwable error) {
error.printStackTrace();
}
/**
*@description:消息发送给指定人员
*@author:cyb
*@date: 2018-12-03 14:35
*@param: message
*@param: To
*@return: void
*/
public void sendMessageTo(String message, String To) throws IOException {
for (WebSockets item : clients.values()) {
if (item.userId.equals(To) )
item.session.getAsyncRemote().sendText(message);
}
}
public static synchronized int getOnlineCount() {
return onlineCount;
}
public static synchronized void addOnlineCount() {
WebSockets.onlineCount++;
}
public static synchronized void subOnlineCount() {
WebSockets.onlineCount--;
}
public static synchronized Map<User, WebSockets> getClients() {
return clients;
}
}

五、websocket辅助类

package com.yjlc.platform.utils.webSocket;

import javax.servlet.http.HttpSession;
import javax.websocket.HandshakeResponse;
import javax.websocket.server.HandshakeRequest;
import javax.websocket.server.ServerEndpointConfig; /**
* --------------------------------------------------------------
* CopyRights(c)2018,YJLC
* All Rights Reserved
* <p>
* FileName: HttpSessionConfigurator.java
* Description:配置类 将http中的session传入websocket中
* Author: cyb
* CreateDate: 2018-11-26
* --------------------------------------------------------------
*/
public class HttpSessionConfigurator extends ServerEndpointConfig.Configurator { @Override
public void modifyHandshake(ServerEndpointConfig sec,
HandshakeRequest request, HandshakeResponse response) {
// 获取当前Http连接的session
HttpSession httpSession = (HttpSession) request.getHttpSession();
// 将http session信息注入websocket session
sec.getUserProperties().put(HttpSession.class.getName(), httpSession);
}
}

六、后端代码

/**
*@description:发送信息
*@author:cyb
*@date: 2018-11-19 10:03
*@param: id
*@return: java.util.Map<java.lang.String,java.lang.Object>
*/
@RequestMapping("sndmsg")
@ResponseBody
public Map<String,Object> sndmsg(Long id){
Map<String,Object> map = new HashMap<>();
AdminUser user=(AdminUser) SecurityUtils.getSubject().getSession().getAttribute("users");
try{
// int k=0;
int k= service.sndmsg(id,user);
if(k==200){
map.put("code",200);
return map;
}else {
map.put("code",0);
return map;
}
}catch (Exception e){
e.printStackTrace();
map.put("code",500);
return map;
}
}

七、service层实现类

//该类下标红的未重点,其余的代码大家可以跳过
public int sndmsg(Long id,AdminUser adminUser) {
//获取该条信息模板
SettingTemplateDTO templateDTO = templateDao.getSystemTemplateInfo(id);
List<NotificationSendLog> logList = new ArrayList<>();
String content = templateDTO.getContent();//模板内容
Boolean result = false;
int w=0;//操作结果
int count =0;//发送总条数
int sucNum=0;//发送成功条数
//查询所有用户列表
List<SecurityUser> userList =templateDao.getUserList();
if(templateDTO.getSendMode().equals("1")){//短信发送
}else if(templateDTO.getSendMode().equals("3")){//站内发送(桌面消息提示)
if(templateDTO.getSendPeople().equals("1")){//个人用户
}else if(templateDTO.getSendPeople().equals("2")){//企业用户
WebSockets webSocket = new WebSockets();
List<User> onLineList =WebSockets.list;//获取在线人人员id
List<SecurityUser> userList1 = templateDao.getUserList();
List<NotificationUserLog> userLogList = new ArrayList<>();
for(SecurityUser list:userList1){
NotificationUserLog userLog = new NotificationUserLog();
//调用装配发送日志实体
NotificationSendLog sendLog =setSendLog(templateDTO,adminUser,list);
userLog.setUserId(list.getId());
userLog.setMsgId(templateDTO.getId());
userLog.setMsgStatus(false);
for(int i =0;i<onLineList.size();i++){
Long userId =onLineList.get(i).getUserId();
if(list.getId()==userId){
userLog.setMsgStatus(true);
sendLog.setStatus(true);//发送成功
sucNum+=1;
count+=1;
}
}
userLogList.add(userLog);
count= onLineList.size();
sucNum =onLineList.size();
logList.add(sendLog);
}
//插入发送系统通知与用户的关联关系
int ww = templateDao.insertUserSendLog(userLogList);
webSocket.broadcast(templateDTO.getContent());//调用广播()
//插入系统日志
String category="系统消息";
//调用生成发送日志方法
NotificationLog notificationLog =assembleLog(adminUser,category,count,sucNum,templateDTO);
int h = settingDao.insertLog(notificationLog);
//插入发送日志
w =templateDao.insertSendLog(logList);
}
}
//修改发送状态
templateDTO.setSendStatus(true);
int z = templateDao.updateSystemTemplate(templateDTO);
if(w>0){
return 200;
}
return 0;

注意点:项目在浏览器中访问时,切记路径要和websocket.js中的一致

SSM框架下使用websocket实现后端发送消息至前端

SSM框架下使用websocket实现后端发送消息至前端

以上内容仅供参考,如果以上内容有所不当或者不清楚的可以联系本人。技术在于沟通!

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