一個springboot集成websocket一對一聊天的小demo
websocket所需的jar包
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>7.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>net.sf.json-lib</groupId>
<artifactId>json-lib</artifactId>
<version>2.4</version>
<classifier>jdk15</classifier>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
<version>1.3.5.RELEASE</version>
</dependency>
WebSocketOneToOne
package com.cn.ljt.websocket;
import net.sf.json.JSONObject;
import org.springframework.web.bind.annotation.RestController;
import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* @ServerEndpoint 註解是一個類層次的註解,它的功能主要是將目前的類定義成一個websocket服務器端,
* 註解的值將被用於監聽用戶連接的終端訪問URL地址,客戶端可以通過這個URL來連接到WebSocket服務器端
*/
@RestController
@ServerEndpoint(value = "/webSocketOneToOne/{param}")
public class WebSocketOneToOne {
// 靜態變量,用來記錄當前在線連接數。應該把它設計成線程安全的。
private static int onlineCount;
//實現服務端與單一客戶端通信的話,可以使用Map來存放,其中Key爲用戶標識
private static Map<String,WebSocketOneToOne> connections = new ConcurrentHashMap<>();
// 與某個客戶端的連接會話,需要通過它來給客戶端發送數據
private Session session;
private String role;
private String socketId;
/**
* 連接建立成功調用的方法
*
* @param session
* 可選的參數。session爲與某個客戶端的連接會話,需要通過它來給客戶端發送數據
*/
@OnOpen
public void onOpen(@PathParam("param") String param, Session session) {
this.session = session;
String[] arr = param.split(",");
this.role = arr[0]; //用戶標識
this.socketId = arr[1]; //會話標識
connections.put(role,this); //添加到map中
addOnlineCount(); // 在線數加
System.out.println("有新連接加入!新用戶:"+role+",當前在線人數爲" + getOnlineCount());
}
/**
* 連接關閉調用的方法
*/
@OnClose
public void onClose() {
connections.remove(role); // 從map中移除
subOnlineCount(); // 在線數減
System.out.println("有一連接關閉!當前在線人數爲" + getOnlineCount());
}
/**
* 收到客戶端消息後調用的方法
*
* @param message
* 客戶端發送過來的消息
* @param session
* 可選的參數
*/
@OnMessage
public void onMessage(String message, Session session) {
System.out.println("來自客戶端的消息:" + message);
JSONObject json=JSONObject.fromObject(message);
String string = null; //需要發送的信息
String to = null; //發送對象的用戶標識
if(json.has("message")){
string = (String) json.get("message");
}
if(json.has("role")){
to = (String) json.get("role");
}
send(string,role,to,socketId);
}
/**
* 發生錯誤時調用
*
* @param session
* @param error
*/
@OnError
public void onError(Session session, Throwable error) {
System.out.println("發生錯誤");
error.printStackTrace();
}
//發送給指定角色
public void send(String msg,String from,String to,String socketId){
try {
//to指定用戶
WebSocketOneToOne con = connections.get(to);
if(con!=null){
if(socketId==con.socketId||con.socketId.equals(socketId)){
con.session.getBasicRemote().sendText(from+"說:"+msg);
}
}
//from具體用戶
WebSocketOneToOne confrom = connections.get(from);
if(confrom!=null){
if(socketId==confrom.socketId||confrom.socketId.equals(socketId)){
confrom.session.getBasicRemote().sendText(from+"說:"+msg);
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static synchronized int getOnlineCount() {
return onlineCount;
}
public static synchronized void addOnlineCount() {
WebSocketOneToOne.onlineCount++;
}
public static synchronized void subOnlineCount() {
WebSocketOneToOne.onlineCount--;
}
}
配置websocketConfig
package com.cn.ljt.websocket;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;
@Configuration
public class websocketConfig {
@Bean
public ServerEndpointExporter serverEndpointExporter(){
return new ServerEndpointExporter();
}
}
HTML代碼,使用的thymeleaf模板
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script th:src="@{/js/jquery-1.12.4.js}"></script>
<!--<script type="text/javascript" src="/js/jquery-1.12.4.js" ></script>-->
</head>
<script th:inline="javascript">
//var usr=[[${usr}]];
var websocket = null;
//判斷當前瀏覽器是否支持WebSocket
if ('WebSocket' in window) {
//2,123 2登錄用戶標識,123會話id
//[[${session.usr}]]獲取session的用戶標識
var url = "ws://" + window.location.host +"/webSocketOneToOne/"+[[${session.usr}]]+",123"
websocket = new WebSocket(url);
} else {
alert('當前瀏覽器 Not support websocket')
}
//連接發生錯誤的回調方法
websocket.onerror = function() {
setMessageInnerHTML("WebSocket連接發生錯誤");
};
//連接成功建立的回調方法
websocket.onopen = function() {
setMessageInnerHTML("WebSocket連接成功");
}
//接收到消息的回調方法
websocket.onmessage = function(event) {
console.log("回調信息",event.data)
setMessageInnerHTML(event.data);
}
//連接關閉的回調方法
websocket.onclose = function() {
setMessageInnerHTML("WebSocket連接關閉");
}
//監聽窗口關閉事件,當窗口關閉時,主動去關閉websocket連接,防止連接還沒斷開就關閉窗口,server端會拋異常。
window.onbeforeunload = function() {
closeWebSocket();
}
//將消息顯示在網頁上
function setMessageInnerHTML(innerHTML) {
document.getElementById('message').innerHTML += innerHTML + '<br/>';
}
//關閉WebSocket連接
function closeWebSocket() {
websocket.close();
}
//發送消息
function send() {
var message = document.getElementById('text').value;
//message作爲發送的信息,role作爲發送的對象標識,socketId是此次會話的標識
websocket.send(JSON.stringify({'message':message,'role':document.getElementById('toname').value,'socketId':"123"}));
}
</script>
<body>
用戶:<span id="usr" th:text="${session.usr}"></span>
<input id="text" type="text" />
<br/>發送給:<input id="toname" type="text" />
<br/>
<button onclick="send()">發送消息</button>
<button onclick="closeWebSocket()">關閉WebSocket連接</button>
<div id="message"></div>
</body>
</html>
controller
package com.cn.ljt.controller;
import com.cn.ljt.websocket.WebSocketOneToOne;
import org.apache.ibatis.annotations.Param;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpSession;
@Controller
public class UserController {
@Autowired
private WebSocketOneToOne webSocketOneToOne;
/**
* 登錄界面直接聊天
* **/
@RequestMapping("user_1")
public String user_1(String usr , HttpSession session){
session.setAttribute("usr",usr);
return "user_1";
}
/**
* 發送消息 消息內容,發送人,接收人,會話標識
* **/
@RequestMapping("message")
public void message(String msg,String from,String to,String socketId){
webSocketOneToOne.send(msg, from, to, socketId);
}
}
瀏覽器輸入http://localhost:8082/user_1?usr=2
"2"爲用戶的標識