1、添加依赖
compile project(":faas-spring-boot-starter-data-websocket")
2、定义WebSocketHandler Socket 服务入口(Header接收 jwt-token 同应用登录的Token(直接解决鉴权问题),然后定义请求的自定义参数,方便后续消息推送、支持群发、私发、模糊匹配)
java
@Component
@WebSocketMapping("/server")
@AllArgsConstructor
public class ServerHandler implements WebSocketHandler {
private final static Logger LOG = LoggerFactory.getLogger(ServerHandler.class);
private final ConcurrentHashMap<String, WebSocketSender> senders;
private final WebsocketResourceProperties properties;
private final WebsocketMessageApiService messageApiService;
private final UserApiService userApiService;
@Override
public Mono<Void> handle(WebSocketSession session) {
HandshakeInfo info = session.getHandshakeInfo();
String token = Validator.getToken(info);
Terminal terminal = getTerminal(info);
try {
Terminal terminalByToken = Validator.verify(token, properties.getClients());
String userId = terminalByToken.getUserId();
//openId 转 userId
UserInfoResp infoResp = userApiService.get(UserGetReq.newBuilder().setLoginUserId(userId).build());
userId = infoResp.getUserId();
terminal.setUserId(userId);
messageApiService.addOnlineUsers(userId);
} catch (FibException e) {
LOG.error("会话创建: code={}, message={}", e.getRespCode(), e.getRespMessage());
session.close();
return Mono.empty();
}
String userId = terminal.getUserId();
String id = WebSocketSender.getSenderId(userId, terminal.getAppType(), terminal.getAppSn(), terminal.getTableCode());
session.receive().doFinally(sig -> {
LOG.info("会话终止: id={},name={}", id, sig.name());
session.close();
senders.remove(id);
messageApiService.removeOnlineUsers(userId);
}).subscribe(inMsg -> {
LOG.info("接收消息: id={}, message={}", id, inMsg.getPayloadAsText());
process(inMsg.getPayloadAsText());
});
return session.send(Flux.create(sink -> {
senders.put(id, new WebSocketSender(session, sink));
LOG.info("会话创建: id={},count={},senders={}", id, senders.size(), JSON.toJSONString(senders.keys()));
}));
}
/**
* 处理客户端消息
*
* @param text
*/
private void process(String text) {
}
/**
* 应用终端信息
*
* @param info
* @return
*/
private static Terminal getTerminal(HandshakeInfo info) {
Terminal terminal = new Terminal();
HttpHeaders headers = info.getHeaders();
Map<String, String> queryParams = getQueryParams(info.getUri().getQuery());
String appSn = headers.getFirst("appSn");
String appType = headers.getFirst("appType");
String tableCode = headers.getFirst("tableCode");
if (StringUtils.isEmpty(appSn)) {
appSn = queryParams.get("appSn");
}
if (StringUtils.isEmpty(tableCode)) {
tableCode = queryParams.get("tableCode");
}
if (StringUtils.isEmpty(appType)) {
appType = queryParams.get("appType");
}
terminal.setAppSn(appSn);
terminal.setAppType(appType);
terminal.setTableCode(tableCode);
return terminal;
}
/**
* 获取请求参数
*
* @param queryStr
* @return
*/
private static Map<String, String> getQueryParams(String queryStr) {
Map<String, String> queryMap = new HashMap<>();
if (!StringUtils.isEmpty(queryStr)) {
String[] queryParam = queryStr.split("&");
Arrays.stream(queryParam).forEach(s -> {
String[] kv = s.split("=", 2);
String value = kv.length == 2 ? kv[1] : "";
queryMap.put(kv[0], value);
});
}
return queryMap;
}
}
3、Validator 辅助类(解析 Header中的token)
java
public class Validator {
private static final Pattern authorizationPattern = Pattern.compile("^Bearer (?<token>[a-zA-Z0-9-._~+/]+=*)$", 2);
private static String getTokenFromHeader(HttpHeaders headers) {
String authorization = headers.getFirst("Authorization");
if (StringUtils.isEmpty(authorization)) {
return null;
}
if (StringUtils.startsWithIgnoreCase(authorization, "bearer")) {
Matcher matcher = authorizationPattern.matcher(authorization);
if (!matcher.matches()) {
throw FibException.ofServerError("无效令牌[Authorization]");
} else {
return matcher.group("token");
}
} else {
return null;
}
}
public static String getToken(HandshakeInfo handshakeInfo) {
String token = getTokenFromHeader(handshakeInfo.getHeaders());
if (StringUtils.isEmpty(token)) {
Map<String, String> queryParams = getQueryParams(handshakeInfo.getUri().getQuery());
return queryParams.get("token");
}
return token;
}
/**
* 验证token有效性并返回id
*
* @param token
* @return
* @throws ParseException
*/
public static Terminal verify(String token, List<String> clients) {
try {
SignedJWT signedJWT = SignedJWT.parse(token);
JWTClaimsSet claims = signedJWT.getJWTClaimsSet();
String sub = claims.getStringClaim("sub");
if (StringUtils.isEmpty(sub)) {
throw FibException.ofServerError("无效令牌[Illegal sub]");
}
List<String> aud = claims.getStringListClaim("aud");
if (aud == null || aud.isEmpty()) {
throw FibException.ofServerError("无效令牌[Illegal aud]");
}
if (clients != null && !clients.isEmpty()) {
Object audStr = aud.get(0);
if (!clients.contains(audStr)) {
throw FibException.ofServerError("无效令牌[Illegal aud]");
}
}
String iss = claims.getStringClaim("iss");
if (StringUtils.isEmpty(iss)) {
throw FibException.ofServerError("无效令牌[Missing issuer]");
}
Date exp = claims.getDateClaim("exp");
long now = System.currentTimeMillis();
if (exp == null || now > exp.getTime()) {
throw FibException.ofServerError("无效令牌[Expired]");
}
Terminal terminal = new Terminal();
terminal.setUserId(sub);
return terminal;
} catch (ParseException e) {
throw FibException.ofServerError("无效令牌[Unexpected token]");
}
}
/**
* 获取请求参数
*
* @param queryStr
* @return
*/
private static Map<String, String> getQueryParams(String queryStr) {
Map<String, String> queryMap = new HashMap<>();
if (!StringUtils.isEmpty(queryStr)) {
String[] queryParam = queryStr.split("&");
Arrays.stream(queryParam).forEach(s -> {
String[] kv = s.split("=", 2);
String value = kv.length == 2 ? kv[1] : "";
queryMap.put(kv[0], value);
});
}
return queryMap;
}
}
4、WebSocketConfiguration
java
@Configuration
public class WebSocketConfiguration {
@Bean
public HandlerMapping webSocketMapping() {
return new WebSocketMappingHandlerMapping();
}
@Bean
public WebSocketHandlerAdapter handlerAdapter() {
return new WebSocketHandlerAdapter();
}
@Bean
public ConcurrentHashMap<String, WebSocketSender> senders() {
return new ConcurrentHashMap<String, WebSocketSender>();
}
}
5、WebSocketMappingHandlerMapping
java
/**
* Register WebSocket handlers annotated by @WebSocketMapping
*/
public class WebSocketMappingHandlerMapping extends SimpleUrlHandlerMapping {
private final Map<String, WebSocketHandler> handlers = new LinkedHashMap<>();
@Override
public void initApplicationContext() throws BeansException {
Map<String, Object> beanMap = obtainApplicationContext().getBeansWithAnnotation(WebSocketMapping.class);
beanMap.values().forEach(bean -> {
if (!(bean instanceof WebSocketHandler)) {
throw new RuntimeException(String.format("Controller [%s] doesn't implement WebSocketHandler interface.", bean.getClass().getName()));
}
WebSocketMapping annotation = AnnotationUtils.getAnnotation(bean.getClass(), WebSocketMapping.class);
handlers.put(Objects.requireNonNull(annotation).value(), (WebSocketHandler) bean);
});
super.setOrder(Ordered.HIGHEST_PRECEDENCE);
super.setUrlMap(handlers);
super.initApplicationContext();
}
}
6、ServerJob、离线后重新登录,可以重新推送消息
java
@Service
@AllArgsConstructor
@Lazy(false)
public class ServerJob extends AbstractDistributedSchedule {
private final Logger logger = LoggerFactory.getLogger(getClass());
private final WebsocketMessageApiService messageApiService;
private final ConcurrentHashMap<String, WebSocketSender> senders;
private final UserApiService userApiService;
@Override
@Scheduled(cron = "0 0/1 * * * ?")
public void execute() {
try {
logger.info(String.format("消息推送异步处理任务,当前在线用户数[%s]", senders.size()));
boolean lock = lock(0, 1000);
if (!lock) {
logger.info("get lock fail");
return;
}
fib.core.Pageable<cn.finopen.faas.api.websocket.dto.WebsocketMessageFindResp> pageable = messageApiService.find(WebsocketMessageFindReq.newBuilder().setStatus(MessageStatus.WAITING.ordinal()).setPage(1).setPageSize(100).build());
if (pageable.getTotal() <= 0) {
return;
}
Collection<WebsocketMessageFindResp> items = pageable.getItems();
items.forEach(req -> ThreadPoolUtils.execute(() -> {
String userId = req.getUserId();
UserInfoResp infoResp = userApiService.get(UserGetReq.newBuilder().setLoginUserId(userId).build());
String appSn = req.getAppSn();
String appType = req.getAppType();
String tableCode = req.getTableCode();
boolean flag = WebSocketSender.send(senders, infoResp.getUserId(), appType, appSn, tableCode, req.getData());
if (flag) {
messageApiService.update(WebsocketMessageUpdateReq.newBuilder().setId(req.getId()).setStatus(MessageStatus.SENT.ordinal()).build());
}
}));
} catch (Exception e) {
logger.error("消息推送异步处理任务", e);
}
}
}
7、消息推送API 集成到具体的业务服务(支持在线和离线)
java
@AllArgsConstructor
@Service
public class WebsocketMessageApiServiceImpl implements WebsocketMessageApiService {
private final ConcurrentHashMap<String, WebSocketSender> senders;
private final WebsocketMessageRepository repository;
private final RedisService redisService;
private final static String WEBSOCKET_ONLINE_USERS = "WEBSOCKET_ONLINE_USERS";
private final UserApiService userApiService;
@Override
public WebsocketMessageCreateResp create(WebsocketMessageCreateReq req) {
WebsocketMessageData data = req.getData();
if (data.getType() == null) {
throw FibException.ofBadRequest("消息类型不能为空");
}
String content = trim(data.getContent());
if (StringUtils.isEmpty(content)) {
throw FibException.ofBadRequest("消息内容不能为空");
}
List<String> userIdList = req.getUserId();
if (userIdList == null || userIdList.isEmpty()) {
throw FibException.ofBadRequest("用户id不能不能为空");
}
data.setTime(System.currentTimeMillis());
String text = data.toString();
String appSn = req.getAppSn();
String appType = req.getAppType();
String tableCode = req.getTableCode();
String ignoreUserId = req.getIgnoreUserId();
if (StringUtils.isNotEmpty(ignoreUserId)) {
UserInfoResp infoResp = userApiService.get(UserGetReq.newBuilder().setLoginUserId(ignoreUserId).build());
ignoreUserId = infoResp.getUserId();
}
List<WebsocketMessage> messages = new ArrayList<>();
boolean checkOnline = req.getCheckOnline() != null && req.getCheckOnline();
for (String userId : userIdList) {
int status = MessageStatus.SENT.ordinal();
UserInfoResp infoResp = userApiService.get(UserGetReq.newBuilder().setLoginUserId(userId).build());
boolean flag = WebSocketSender.send(senders, infoResp.getUserId(), appType, appSn, tableCode, text, ignoreUserId);
if (!flag) {
if (checkOnline) {
status = MessageStatus.FAILED.ordinal();
} else {
status = MessageStatus.WAITING.ordinal();
}
}
messages.add(WebsocketMessage.newBuilder()
.setUserId(userId)
.setCheckOnline(checkOnline)
.setData(text)
.setAppSn(appSn)
.setAppType(appType)
.setTableCode(tableCode)
.setCreateTime(LocalDateTime.now())
.setStatus(status)
.build());
}
if (!messages.isEmpty() && content.length() < 1024) {
repository.saveAll(messages);
}
return WebsocketMessageCreateResp.newBuilder().build();
}
@Override
public WebsocketMessageGetResp get(WebsocketMessageGetReq req) {
Long id = req.getId();
Optional<WebsocketMessage> messageOptional = repository.findOne(Example.of(WebsocketMessage.newBuilder().setId(id).build()));
if (messageOptional.isEmpty()) {
throw FibException.ofNotFound("消息不存在");
}
WebsocketMessage entity = messageOptional.get();
return WebsocketMessageGetResp.newBuilder()
.setId(entity.getId())
.setUserId(entity.getUserId())
.setData(entity.getData())
.setCheckOnline(entity.getCheckOnline())
.setCreateTime(entity.getCreateTime()).build();
}
@Override
public WebsocketMessageUpdateResp update(WebsocketMessageUpdateReq req) {
Long id = req.getId();
Optional<WebsocketMessage> messageOptional = repository.findOne(Example.of(WebsocketMessage.newBuilder().setId(id).build()));
if (messageOptional.isEmpty()) {
throw FibException.ofNotFound("消息不存在");
}
WebsocketMessage entity = messageOptional.get();
entity.setStatus(req.getStatus());
entity.setUpdateTime(LocalDateTime.now());
repository.save(entity);
return WebsocketMessageUpdateResp.newBuilder().build();
}
@Override
public Pageable<WebsocketMessageFindResp> find(WebsocketMessageFindReq req) {
QWebsocketMessage qEntity = QWebsocketMessage.websocketMessage;
BooleanExpression expression = qEntity.isNotNull();
if (req.getStatus() != null) {
expression = expression.and(qEntity.status.eq(req.getStatus()));
}
if (StringUtils.isNotEmpty(req.getUserId())) {
expression = expression.and(qEntity.userId.eq(req.getUserId()));
}
List<String> createTimes = req.getCreateTime();
if (createTimes != null && !createTimes.isEmpty()) {
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
if (createTimes.size() == 1) {
expression = expression.and(qEntity.createTime.goe(LocalDateTime.parse(createTimes.get(0), formatter)));
} else {
expression = expression.and(qEntity.createTime.goe(LocalDateTime.parse(createTimes.get(0), formatter))).and(qEntity.createTime.lt(LocalDateTime.parse(createTimes.get(1), formatter)));
}
}
PageRequest pageRequest = PageRequest.of(req.getPage() - 1, req.getPageSize(), Sort.by(Sort.Order.desc("createTime")));
Page<WebsocketMessage> data = repository.findAll(expression, pageRequest);
return PageImpl.of(req.getPage(), req.getPageSize(), data.getTotalElements(), parse(data.getContent()));
}
@Override
public Set<String> getOnlineUsers(WebsocketMessageGetOnlineUserReq req) {
Set<String> data = redisService.get(WEBSOCKET_ONLINE_USERS, Set.class);
if (data == null) {
data = new HashSet<>();
}
return data;
}
@Override
public Boolean addOnlineUsers(String userId) {
Set data = redisService.get(WEBSOCKET_ONLINE_USERS, Set.class);
if (data == null) {
data = new HashSet<>();
}
data.add(userId);
redisService.set(WEBSOCKET_ONLINE_USERS, JSON.toJSONString(data), 24 * 3600);
return true;
}
@Override
public Boolean removeOnlineUsers(String userId) {
Set data = redisService.get(WEBSOCKET_ONLINE_USERS, Set.class);
if (data != null) {
data.remove(userId);
redisService.set(WEBSOCKET_ONLINE_USERS, JSON.toJSONString(data), 24 * 3600);
}
return true;
}
private List<WebsocketMessageFindResp> parse(List<WebsocketMessage> content) {
List<WebsocketMessageFindResp> result = new ArrayList<>();
for (WebsocketMessage item : content) {
WebsocketMessageFindResp temp = WebsocketMessageFindResp.newBuilder().build();
AvroUtils.copy(item, temp);
result.add(temp);
}
return result;
}
/**
* 如果内容为json/jsonArray 剔除null属性,防止内容过长
*
* @param src
* @return
*/
private String trim(String src) {
if (src == null || src.isEmpty()) {
return src;
}
try {
if (src.startsWith("{") && src.endsWith("}")) {
return JSONObject.toJSONString(JSONObject.parseObject(src), SerializerFeature.WriteNullListAsEmpty);
} else if (src.startsWith("[") && src.endsWith("]")) {
return JSONObject.toJSONString(JSONArray.parseArray(src), SerializerFeature.WriteNullListAsEmpty);
}
} catch (Exception ignore) {
}
return src;
}
}
8、Web在线测试工具
html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>websocket在线测试工具</title>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" rel="stylesheet">
<link href="websocket_tool.min.css" rel="stylesheet">
<style>
</style>
</head>
<body>
<div class="well socketBody">
<div class="socketTop">
<div class="socketTopColLeft">
<div class="btn-group socketSelect">
<button type="button" class="btn btn-default dropdown-toggle socketSelectBtn" data-toggle="dropdown"
aria-expanded="false">
<span class="showHeadWS">WS</span>
<span class="caret"> </span>
</button>
<ul class="dropdown-menu socketSelectshadow">
<li><a onclick="showWS('WS')">WS</a></li>
<li><a onclick="showWS('WSS')">WSS</a></li>
</ul>
</div>
</div>
<div class="socketTopColRight">
<input type="text" list="typelist" class="form-control urlInput"
placeholder="请输入连接地址~ 如: 127.0.0.1:8000/ws"
oninput="inputChange()">
<datalist id="typelist" class="inputDatalist">
<option>
<!-- 这里放默认ws地址 -->
</option>
</datalist>
</div>
</div>
<div class="socketBG well" id="main"></div>
<div class="socketBottom row">
<div class="col-xs-8 socketTextareaBody">
<input class="form-control socketTextarea" placeholder="请输入发送信息~"></input>
<input id="token" class="form-control " placeholder="Sec-WebSocket-Protocol~"></input>
<input id="sid" class="form-control " placeholder="sid~"></input>
<input id="rid" class="form-control " placeholder="rid~"></input>
</div>
<div class="col-xs-2 socketBtnSendBody">
<button type="button" class="btn btn-success socketBtnSend" onclick="sendBtn()">发送</button>
</div>
<div class="col-xs-2 socketBtnBody">
<button type="button" class="btn btn-primary socketBtn" onclick="connectBtn()">连接</button>
<button type="button" class="btn btn-info socketBtn" onclick="emptyBtn()">清屏</button>
<button type="button" class="btn btn-warning socketBtn" onclick="closeBtn()">断开</button>
</div>
</div>
<div class="alert alert-danger socketInfoTips" role="alert">...</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/jquery@1.12.4/dist/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/js/bootstrap.min.js"></script>
<script src="websocket_tool.min.js"></script>
</body>
</html>
***** 另外客户端在使用过,为了避免掉线情况的发生,可以采取以下几种策略:
- 心跳机制
实现心跳包机制来维持连接。客户端定时向服务器发送心跳包,服务器收到后回应,以此来确认连接是否仍然活跃。如果在一定时间内没有收到来自对方的心跳响应,则认为连接已断开,并进行相应的处理。
- 重连机制
当检测到 WebSocket 连接断开时,自动尝试重新建立连接。可以通过设置递增的重试间隔来避免过于频繁地尝试连接,例如每次重试之间等待的时间逐渐增加。
优化网络环境适应性
根据不同的网络环境调整策略,比如在弱网环境下加大心跳包的间隔,减少数据传输频率等。
- 错误处理
对 WebSocket 的各种事件(如 onopen, onmessage, onerror, onclose)进行适当的监听和处理,确保能够及时发现并处理连接问题。
- 多实例管理
**如果应用程序需要维护多个 WebSocket 连接,确保每个连接独立管理,避免相互之间的干扰导致掉线。**
实例:
javascript
let socket = null;
const HEARTBEAT_INTERVAL = 30000; // 心跳间隔时间
const PING = 'ping'; // 心跳包标识符
const PONG = 'pong';
function connect() {
socket = uni.connectSocket({
url: 'wss://example.com/socket',
success: function (res) {
console.log('WebSocket连接成功');
startHeartbeat();
},
fail: function (err) {
console.error('WebSocket连接失败', err);
reconnect();
}
});
}
function startHeartbeat() {
const heartbeat = setInterval(() => {
socket.send({
data: JSON.stringify({ type: PING })
});
}, HEARTBEAT_INTERVAL);
socket.onMessage(res => {
if (res.data === PONG) {
// 收到服务器的心跳响应
} else {
// 处理其他消息
}
});
socket.onClose(() => {
clearInterval(heartbeat);
reconnect();
});
}
function reconnect() {
// 重连逻辑
setTimeout(() => {
connect();
}, 5000); // 每次重连等待5秒
}
// 初始化连接
connect();
ping 和 pong 分别表示客户端和服务器之间的心跳信号:
Ping:客户端发送给服务器的心跳信号,用于检测连接状态。
Pong:服务器响应客户端的心跳信号,表示服务器已经收到并处理了客户端的心跳请求。
具体来说:
Ping:
客户端定期向服务器发送一个心跳包,这个心跳包的内容通常是简单的字符串 "ping"。
目的是让服务器知道客户端仍然在线并且连接正常。
Pong:
服务器收到客户端发送的 "ping" 后,会回应一个 "pong"。
客户端收到 "pong" 后,就知道连接仍然是活跃的。
这种机制可以用来检测连接的状态,确保双方都在正常工作。如果客户端在一段时间内没有收到服务器的 "pong" 响应,就可以认为连接已经断开,从而触发重连机制