javaweb与websocket实现在线聊天功能总结
技术从一开始ajax轮询后来改成websocket 碰到的一些问题的处理：
websocket的pom依赖
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-websocket</artifactId>
<version>4.0.5.RELEASE</version>
</dependency>
首先是配置处理器
import javax.annotation.Resource;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.socket.config.annotation.EnableWebSocket;
import org.springframework.web.socket.config.annotation.WebSocketConfigurer;
import org.springframework.web.socket.config.annotation.WebSocketHandlerRegistry;
/**
* WebScoket配置处理器
* @author Goofy
* @Date 2015年6月11日 下午1:15:09
*/
@Component
@EnableWebSocket
public class WebSocketConfig extends WebMvcConfigurerAdapter implements WebSocketConfigurer {
@Resource
MyWebSocketHandler handler;
public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
registry.addHandler(handler, "/ws").addInterceptors(new HandShake());
registry.addHandler(handler, "/ws/sockjs").addInterceptors(new HandShake()).withSockJS();
}
}
2.请求所经过的握手拦截器 主要用来将ServerHttpRequest里的session的用户信息存放在attributes里 到处理的handle中 会自动存入websocketsession的attribute里
import java.util.Map;
import javax.servlet.http.HttpSession;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.http.server.ServletServerHttpRequest;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.server.HandshakeInterceptor;
/**
* Socket建立连接（握手）和断开
*
* @author Goofy
* @Date 2015年6月11日 下午2:23:09
*/
public class HandShake implements HandshakeInterceptor {
public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Map<String, Object> attributes) throws Exception {
System.out.println("Websocket:用户[ID:" + ((ServletServerHttpRequest) request).getServletRequest().getSession(false).getAttribute("uid") + "]已经建立连接");
if (request instanceof ServletServerHttpRequest) {
ServletServerHttpRequest servletRequest = (ServletServerHttpRequest) request;
HttpSession session = servletRequest.getServletRequest().getSession(false);
// 标记用户
Long uid = (Long) session.getAttribute("uid");
if(uid!=null){
attributes.put("uid", uid);
}else{
return false;
}
}
return true;
}
public void afterHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Exception exception) {
}
}
Socket处理器 处理连接通信 或错误 关闭等
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import org.springframework.stereotype.Component;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.WebSocketMessage;
import org.springframework.web.socket.WebSocketSession;
import org.xdemo.example.websocket.entity.Message;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
/**
* Socket处理器
*
* @author Goofy
* @Date 2015年6月11日 下午1:19:50
*/
@Component
public class MyWebSocketHandler implements WebSocketHandler {
public static final Map<Long, WebSocketSession> userSocketSessionMap;
static {
userSocketSessionMap = new HashMap<Long, WebSocketSession>();
}
/**
* 建立连接后
*/
public void afterConnectionEstablished(WebSocketSession session)
throws Exception {
Long uid = (Long) session.getAttributes().get("uid");
if (userSocketSessionMap.get(uid) == null) {
userSocketSessionMap.put(uid, session);
}
}
/**
* 消息处理，在客户端通过Websocket API发送的消息会经过这里，然后进行相应的处理
*/
public void handleMessage(WebSocketSession session, WebSocketMessage<?> message) throws Exception {
if(message.getPayloadLength()==0)return;
Message msg=new Gson().fromJson(message.getPayload().toString(),Message.class);
msg.setDate(new Date());
sendMessageToUser(msg.getTo(), new TextMessage(new GsonBuilder().setDateFormat("yyyy-MM-dd HH:mm:ss").create().toJson(msg)));
}
/**
* 消息传输错误处理
*/
public void handleTransportError(WebSocketSession session,
Throwable exception) throws Exception {
if (session.isOpen()) {
session.close();
}
Iterator<Entry<Long, WebSocketSession>> it = userSocketSessionMap
.entrySet().iterator();
// 移除Socket会话
while (it.hasNext()) {
Entry<Long, WebSocketSession> entry = it.next();
if (entry.getValue().getId().equals(session.getId())) {
userSocketSessionMap.remove(entry.getKey());
System.out.println("Socket会话已经移除:用户ID" + entry.getKey());
break;
}
}
}
/**
* 关闭连接后
*/
public void afterConnectionClosed(WebSocketSession session,
CloseStatus closeStatus) throws Exception {
System.out.println("Websocket:" + session.getId() + "已经关闭");
Iterator<Entry<Long, WebSocketSession>> it = userSocketSessionMap
.entrySet().iterator();
// 移除Socket会话
while (it.hasNext()) {
Entry<Long, WebSocketSession> entry = it.next();
if (entry.getValue().getId().equals(session.getId())) {
userSocketSessionMap.remove(entry.getKey());
System.out.println("Socket会话已经移除:用户ID" + entry.getKey());
break;
}
}
}
public boolean supportsPartialMessages() {
return false;
}
/**
* 给所有在线用户发送消息
*
* @param message
* @throws IOException
*/
public void broadcast(final TextMessage message) throws IOException {
Iterator<Entry<Long, WebSocketSession>> it = userSocketSessionMap
.entrySet().iterator();
// 多线程群发
while (it.hasNext()) {
final Entry<Long, WebSocketSession> entry = it.next();
if (entry.getValue().isOpen()) {
// entry.getValue().sendMessage(message);
new Thread(new Runnable() {
public void run() {
try {
if (entry.getValue().isOpen()) {
entry.getValue().sendMessage(message);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();
}
}
}
/**
* 给某个用户发送消息
*
* @param userName
* @param message
* @throws IOException
*/
public void sendMessageToUser(Long uid, TextMessage message)
throws IOException {
WebSocketSession session = userSocketSessionMap.get(uid);
if (session != null && session.isOpen()) {
session.sendMessage(message);
}
}
}
页面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getServerName() + ":"
+ request.getServerPort() + path + "/";
String basePath2 = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<script type="text/javascript" src="<%=basePath2%>resources/jquery.js"></script>
<style>
textarea {
height: 300px;
width: 100%;
resize: none;
outline: none;
}
input[type=button] {
float: right;
margin: 5px;
width: 50px;
height: 35px;
border: none;
color: white;
font-weight: bold;
outline: none;
}
.clear {
background: red;
}
.send {
background: green;
}
.clear:active {
background: yellow;
}
.send:active {
background: yellow;
}
.msg {
width: 100%;
height: 25px;
outline: none;
}
#content {
border: 1px solid gray;
width: 100%;
height: 400px;
overflow-y: scroll;
}
.from {
background-color: green;
width: 80%;
border-radius: 10px;
height: 30px;
line-height: 30px;
margin: 5px;
float: left;
color: white;
padding: 5px;
font-size: 22px;
}
.to {
background-color: gray;
width: 80%;
border-radius: 10px;
height: 30px;
line-height: 30px;
margin: 5px;
float: right;
color: white;
padding: 5px;
font-size: 22px;
}
.name {
color: gray;
font-size: 12px;
}
.tmsg_text {
color: white;
background-color: rgb(47, 47, 47);
font-size: 18px;
border-radius: 5px;
padding: 2px;
}
.fmsg_text {
color: white;
background-color: rgb(66, 138, 140);
font-size: 18px;
border-radius: 5px;
padding: 2px;
}
.sfmsg_text {
color: white;
background-color: rgb(148, 16, 16);
font-size: 18px;
border-radius: 5px;
padding: 2px;
}
.tmsg {
clear: both;
float: right;
width: 80%;
text-align: right;
}
.fmsg {
clear: both;
float: left;
width: 80%;
}
</style>
<script>
var path = '<%=basePath%>';
var uid=${uid eq null?-1:uid};
if(uid==-1){
location.href="<%=basePath2%>";
}
var from=uid;
var fromName='${name}';
var to=uid==1?2:1;
var websocket;
if ('WebSocket' in window) {
websocket = new WebSocket("ws://" + path + "/ws?uid="+uid);
} else if ('MozWebSocket' in window) {
websocket = new MozWebSocket("ws://" + path + "/ws"+uid);
} else {
websocket = new SockJS("http://" + path + "/ws/sockjs"+uid);
}
websocket.onopen = function(event) {
console.log("WebSocket:已连接");
console.log(event);
};
websocket.onmessage = function(event) {
var data=JSON.parse(event.data);
console.log("WebSocket:收到一条消息",data);
var textCss=data.from==-1?"sfmsg_text":"fmsg_text";
$("#content").append("<div class='fmsg'><label class='name'>"+data.fromName+" "+data.date+"</label><div class='"+textCss+"'>"+data.text+"</div></div>");
scrollToBottom();
};
websocket.onerror = function(event) {
console.log("WebSocket:发生错误 ");
console.log(event);
};
websocket.onclose = function(event) {
console.log("WebSocket:已关闭");
console.log(event);
}
function sendMsg(){
var v=$("#msg").val();
if(v==""){
return;
}else{
var data={};
data["from"]=from;
data["fromName"]=fromName;
data["to"]=to;
data["text"]=v;
websocket.send(JSON.stringify(data));
$("#content").append("<div class='tmsg'><label class='name'>我 "+new Date().Format("yyyy-MM-dd hh:mm:ss")+"</label><div class='tmsg_text'>"+data.text+"</div></div>");
scrollToBottom();
$("#msg").val("");
}
}
function scrollToBottom(){
var div = document.getElementById('content');
div.scrollTop = div.scrollHeight;
}
Date.prototype.Format = function (fmt) { //author: meizz
var o = {
"M+": this.getMonth() + 1, //月份
"d+": this.getDate(), //日
"h+": this.getHours(), //小时
"m+": this.getMinutes(), //分
"s+": this.getSeconds(), //秒
"q+": Math.floor((this.getMonth() + 3) / 3), //季度
"S": this.getMilliseconds() //毫秒
};
if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
for (var k in o)
if (new RegExp("(" + k + ")").test(fmt)) fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
return fmt;
}
function send(event){
var code;
if(window.event){
code = window.event.keyCode; // IE
}else{
code = e.which; // Firefox
}
if(code==13){
sendMsg();
}
}
function clearAll(){
$("#content").empty();
}
</script>
</head>
<body>
欢迎：${sessionScope.name }
<div id="content"></div>
<input type="text" placeholder="请输入要发送的信息" id="msg" class="msg" onkeydown="send(event)">
<input type="button" value="发送" class="send" onclick="sendMsg()" >
<input type="button" value="清空" class="clear" onclick="clearAll()">
</body>
</html>
碰到的一些问题 以及处理的想法
1.之前在拦截器的请求里面得不到session 使用从页面传进来的get方式得到参数uid（后来也没改什么 调试的时候发现可以得到session）
2.客服防止多处登陆的处理：
每次登陆获取loginusermap 如果没有该用户 新增有就更新 然后替换map到session中
登陆拦截器校验登陆的用户的sessionid和map里的是否一致 不一致说明被挤 重新跳转
loginUserMap.put(user.getFid(), sessionId);
request.getSession().getServletContext().setAttribute("loginUserMap", loginUserMap);
3.
按钮嵌在右侧的工具栏 点击固定只弹出一个聊天网页
var op;
op = window.open("${webRoot}customerChat.json","newWin1");
op.focus();
4.
兼容ios（看了请求头里的sec-websocket-extensions不一致 就想的馊主意改头 结果可用）
if(request.getHeaders().get("sec-websocket-extensions").contains("x-webkit-deflate-frame")){
List<String> list = new ArrayList<String>();
list.add("permessage-deflate");
request.getHeaders().remove("sec-websocket-extensions");
request.getHeaders().put("sec-websocket-extensions",list);
}
兼容nginx
upstream tjxm.com{
server 127.0.0.1:8080;
}
server {
listen 80;
server_name localhost;
location / {
proxy_pass http://tjxm.com/;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
proxy_read_timeout 1000s;
}
}
前端WebSocket 连接关闭(代码:1006) 还需配置proxy_read_timeout 1000s;
哈哈 第一次写博客 有点菜鸡 websokcet部分也是从网上找的demo
