事務(Transaction)總結
1. 首先建立一個SpringBoot項目,指定端口號爲10000(可自由設置)
2. 在pom.xml文件裏引入websocket包
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
3. 建立WebSocketConfig配置文件
@Configuration
public class WebSocketConfig {
[@Bean](https://my.oschina.net/bean)
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
}
4. 建立WebSocketServer類
@ServerEndpoint("/websocket")
[@Component](https://my.oschina.net/u/3907912)
[@Slf4j](https://my.oschina.net/slf4j)
@Scope("prototype")
public class WebSocketServer {
//靜態變量,用來記錄當前在線鏈接數
private static final AtomicInteger onlineCount = new AtomicInteger(0);
//concurrent包的線程安全Set,用來存放每一個客戶端對應的MyWebSocket對象。
private static CopyOnWriteArraySet<Session> sessionSet = new CopyOnWriteArraySet<>();
public static void sendMessage(Session session, String message) {
try {
session.getBasicRemote().sendText(String.format("%s (From Server,Session ID=%s)", message, session.getId()));
} catch (IOException e) {
log.error("發送消息出錯:{}", e.getMessage());
e.printStackTrace();
}
}
/**
* 羣發消息
*/
public static void BroadCastInfo(String message) throws IOException {
for (Session session : sessionSet) {
if (session.isOpen()) {
sendMessage(session, "收到消息,消息內容:" + message);
}
}
}
/**
* 指定Session發送消息
*
* @param sessionId
* @param message
* @throws IOException
*/
public static void SendMessage(String sessionId, String message) throws IOException {
Session session = null;
for (Session s : sessionSet) {
if (s.getId().equals(sessionId)) {
session = s;
break;
}
}
if (session != null) {
sendMessage(session, message);
} else {
log.warn("沒有找到你指定ID的會話:{}", sessionId);
}
}
/**
* 鏈接成功 調用
*/
@OnOpen
public void onOpen(Session session) {
sessionSet.add(session);
log.info("有新窗口開始監聽,當前在線人數爲" + onlineCount.incrementAndGet());
}
/**
* 鏈接關閉調用的方法
*/
@OnClose
public void onClose(Session session) {
sessionSet.remove(session);
log.info("有一鏈接關閉!當前在線人數爲" + onlineCount.decrementAndGet());
}
/**
* 接客戶端消息
*
* @param message 客戶端發送消息
* @param session
*/
@OnMessage
public void onMessage(String message, Session session) throws IOException {
log.info("收到來自窗口的信息:" + message);
BroadCastInfo("收到消息,消息內容:" + message);
}
/**
* @param session
* @param error
*/
@OnError
public void onError(Session session, Throwable error) {
log.error("發生錯誤:{},Session ID: {}", error.getMessage(), session.getId());
error.printStackTrace();
}
}
5. 建立restful接口,用於服務端手工推送任務
@RestController
@RequestMapping("/api/ws")
public class WebSocketController {
/**
* 羣發消息內容
*
* @param message
* @return
*/
@RequestMapping(value = "/sendAll", method = RequestMethod.GET)
public String sendAllMessage(@RequestParam String message) {
try {
WebSocketServer.BroadCastInfo(message);
} catch (IOException e) {
e.printStackTrace();
}
return "ok";
}
/**
* 指定會話ID發消息
*
* @param message 消息內容
* @param id 鏈接會話ID
* @return
*/
@RequestMapping(value = "/sendOne", method = RequestMethod.GET)
public String sendOneMessage(@RequestParam String message,
@RequestParam String id) {
try {
WebSocketServer.SendMessage(id, message);
} catch (IOException e) {
e.printStackTrace();
}
return "ok";
}
}
6. 建立前端測試頁面
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>websocket測試</title>
<style type="text/css">
h3,h4{
text-align:center;
}
</style>
</head>
<body>
<h3>WebSocket測試,在<span style="color:red">控制檯</span>查看測試信息輸出!</h3>
<h4>http://wallimn.iteye.com</h4>
<h4>
[url=/api/ws/sendOne?message=單發消息內容&id=none]單發消息連接[/url]
[url=/api/ws/sendAll?message=羣發消息內容]羣發消息連接[/url]
</h4>
<div id="msgDiv" style="width: 400px;height: 300px;background-color: bisque;"></div>
<textarea id="msgTxt"></textarea>
<input type="button" onclick="sendMsg()" value="發送">
<script type="text/javascript">
var socket;
if (typeof (WebSocket) == "undefined") {
console.log("遺憾:您的瀏覽器不支持WebSocket");
} else {
console.log("恭喜:您的瀏覽器支持WebSocket");
//實現化WebSocket對象
//指定要鏈接的服務器地址與端口創建鏈接
//注意ws、wss使用不一樣的端口。我使用自簽名的證書測試,
//沒法使用wss,瀏覽器打開WebSocket時報錯
//ws對應http、wss對應https。
socket = new WebSocket("ws://localhost:10000/websocket");
//鏈接打開事件
socket.onopen = function() {
console.log("Socket 已打開");
socket.send("消息發送測試(From Client)");
};
//收到消息事件
socket.onmessage = function(msg) {
console.log(msg.data);
document.getElementById("msgDiv").append("<p>"+msg.data+"</p>");
};
//鏈接關閉事件
socket.onclose = function() {
console.log("Socket已關閉");
};
//發生了錯誤事件
socket.onerror = function() {
alert("Socket發生了錯誤");
}
//窗口關閉時,關閉鏈接
window.unload=function() {
socket.close();
};
}
function sendMsg(){
var msg=document.getElementById("msgTxt").value;
socket.url
socket.send(msg);
}
</script>
</body>
</html>