多平台统一管理软件接口,如何实现多平台统一管理软件接口
202
2023-07-22
Spring和Websocket相结合实现消息的推送
本文主要有三个步骤
1、用户登录后建立websocket连接,默认选择websocket连接,如果浏览器不支持,则使用sockjs进行模拟连接
2、建立连接后,服务端返回该用户的未读消息
3、服务端进行相关操作后,推送给某一个用户或者所有用户新消息 相关环境 Spring4.0.6(要选择4.0+),tomcat7.0.55
Websocet服务端实现
WebSocketConfig.java
@Configuration
@EnableWebMvc
@EnableWebSocket
public class WebSocketConfig extends WebMvcConfigurerAdapter implements WebSocketConfigurer {
@Override
public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
registry.addHandler(systemWebSocketHandler(),"/webSocketServer").addInterceptors(new WebSocketHandshakeInterceptor());
registry.addHandler(systemWebSocketHandler(), "/sockjs/webSocketServer").addInterceptors(new WebSocketHandshakeInterceptor())
.withSockJS();
}
@Bean
public WebSocketHandler systemWebSocketHandler(){
return new SystemWebSocketHandler();
}
}
不要忘记在springmvc的配置文件中配置对此类的自动扫描
@Configuration
@EnableWebMvc
@EnableWebSocket
这三个大致意思是使这个类支持以@Bean的方式加载bean,并且支持springmvc和websocket,不是很准确大致这样,试了一下@EnableWebMvc不加也没什么影响,@Configuration本来就支持springmvc的自动扫描
registry.addHandler(systemWebSocketHandler(),"/webSocketServer").addInterceptors(new WebSocketHandshakeInterceptor())
用来注册websocket server实现类,第二个参数是访问websocket的地址
registry.addHandler(systemWebSocketHandler(), "/sockjs/webSocketServer").addInterceptors(new WebSocketHandshakeInterceptor())
.withSockJS();
}
这个是使用Sockjs的注册方法
首先SystemWebSocketHandler.java
public class SystemWebSocketHandler implements WebSocketHandler {
private static final Logger logger;
private static final ArrayList
static {
users = new ArrayList<>();
logger = LoggerFactory.getLogger(SystemWebSocketHandler.class);
}
@Autowired
private WebSocketService webSocketService;
@Override
public void afterConnectionEstablished(WebSocketSession session) throws Exception {
logger.debug("connect to the websocket success......");
users.add(session);
String userName = (String) session.getAttributes().get(Constants.WEBSOCKET_USERNAME);
if(userName!= null){
//查询未读消息
int count = webSocketService.getUnReadNews((String) session.getAttributes().get(Constants.WEBSOCKET_USERNAME));
session.sendMessage(new TextMessage(count + ""));
}
}
@Override
public void handleMessage(WebSocketSession session, WebSocketMessage> message) throws Exception {
//sendMessageToUsers();
}
@Override
public void handleTransportError(WebSocketSession session, Throwable exceLTvkabiption) throws Exception {
if(session.isOpen()){
session.close();
}
logger.debug("websocket connection closed......");
users.remove(session);
}
@Override
public void afterConnectionClosed(WebSocketSession session, CloseStatus closeStatus) throws Exception {
logger.debug("websocket connection closed......");
users.remove(session);
}
@Override
public boolean supporhttp://tsPartialMessages() {
return false;
}
/**
* 给所有在线用户发送消息
*
* @param message
*/
public void sendMessageToUsers(TextMessage message) {
for (WebSocketSession user : users) {
try {
if (user.isOpen()) {
user.sendMessage(message);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 给某个用户发送消息
*
* @param userName
* @param message
*/
public void sendMessageToUser(String userName, TextMessage message) {
for (WebSocketSession user : users) {
if (user.getAttributes().get(Constants.WEBSOCKET_USERNAME).equals(userName)) {
try {
if (user.isOpen()) {
user.sendMessage(message);
}
} catch (IOException e) {
e.printStackTrace();
}
break;
}
}
}
}
相关内容大家一看就能明白,就不多解释了
然后WebSocketHandshakeInterceptor.java
public class WebSocketHandshakeInterceptor implements HandshakeInterceptor {
private static Logger logger = LoggerFactory.getLogger(HandshakeInterceptor.class);
@Override
public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Map > attributes) throws Exception { if (request instanceof ServletServerHttpRequest) { ServletServerHttpRequest servletRequest = (ServletServerHttpRequest) request; HttpSession session = servletRequest.getServletRequest().getSession(false); if (session != null) { //使用userName区分WebSocketHandler,以便定向发送消息 String userName = (String) session.getAttribute(Constants.SESSION_USERNAME); attributes.put(Constants.WEBSOCKET_USERNAME,userName); } } return true; } @Override public void afterHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Exception exception) { } } 这个的主要作用是取得当前请求中的用户名,并且保存到当前的WebSocketHandler中,以便确定WebSocketHandler所对应的用户,具体可参考HttpSessionHandshakeInterceptor 用户登录建立websocket连接 index.jsp var websocket; if ('WebSocket' in window) { websocket = new WebSocket("ws://localhost:8080/Origami/webSocketServer"); } else if ('MozWebSocket' in window) { websocket = new MozWebSocket("ws://localhost:8080/Origami/webSocketServer"); } else { websocket = new SockJS("http://localhost:8080/Origami/sockjs/webSocketServer"); } websocket.onopen = function (evnt) { }; websocket.onmessage = function (evnt) { $("#msgcount").html("("+evnt.data+")") }; websocket.onerror = function (evnt) { }; websocket.onclose = function (evnt) { } 使用sockjs时要注意 1、这两个的写法 websocket = new SockJS(http://localhost:8080/Origami/sockjs/webSocketServer); 2、web.xml中 xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_1.xsd"> http:// version web-app_3_1.xsd 这两个的版本都要是3.0+ 然后在这个servlet中加入 然后所有的filter中也加入 3、添加相关依赖 好了,现在websocket可以正常建立起来了 返回用户未读的消息 当连接建立后,会进入SystemWebSocketHandler的afterConnectionEstablished方法,代码看上边,取出WebSocketHandshakeInterceptor中保存的用户名 查询信息后使用session.sendMessage(new TextMessage(count + ""));返回给用户,从哪来回哪去 服务端推送消息给用户 @Controller public class AdminController { static Logger logger = LoggerFactory.getLogger(AdminController.class); @Autowired(required = false) private AdminService adminService; @Bean public SystemWebSocketHandler systemWebSocketHandler() { return new SystemWebSocketHandler(); } @RequestMapping("/auditing") @ResponseBody public String auditing(HttpServletRequest request){ //无关代码都省略了 int unReadNewsCount = adminService.getUnReadNews(username); systemWebSocketHandler().sendMessageToUser(username, new TextMessage(unReadNewsCount + "")); return result; } } 在这里可以使用sendMessageToUser给某个用户推送信息,也可以使用sendMessageToUsers给所有用户推送信息
> attributes) throws Exception {
if (request instanceof ServletServerHttpRequest) {
ServletServerHttpRequest servletRequest = (ServletServerHttpRequest) request;
HttpSession session = servletRequest.getServletRequest().getSession(false);
if (session != null) {
//使用userName区分WebSocketHandler,以便定向发送消息
String userName = (String) session.getAttribute(Constants.SESSION_USERNAME);
attributes.put(Constants.WEBSOCKET_USERNAME,userName);
}
}
return true;
}
@Override
public void afterHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Exception exception) {
}
}
这个的主要作用是取得当前请求中的用户名,并且保存到当前的WebSocketHandler中,以便确定WebSocketHandler所对应的用户,具体可参考HttpSessionHandshakeInterceptor
用户登录建立websocket连接
index.jsp
var websocket;
if ('WebSocket' in window) {
websocket = new WebSocket("ws://localhost:8080/Origami/webSocketServer");
} else if ('MozWebSocket' in window) {
websocket = new MozWebSocket("ws://localhost:8080/Origami/webSocketServer");
} else {
websocket = new SockJS("http://localhost:8080/Origami/sockjs/webSocketServer");
}
websocket.onopen = function (evnt) {
};
websocket.onmessage = function (evnt) {
$("#msgcount").html("("+evnt.data+")")
};
websocket.onerror = function (evnt) {
};
websocket.onclose = function (evnt) {
}
使用sockjs时要注意
1、这两个的写法
websocket = new SockJS(http://localhost:8080/Origami/sockjs/webSocketServer);
2、web.xml中
xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_1.xsd"> http:// version web-app_3_1.xsd 这两个的版本都要是3.0+ 然后在这个servlet中加入 然后所有的filter中也加入 3、添加相关依赖 好了,现在websocket可以正常建立起来了 返回用户未读的消息 当连接建立后,会进入SystemWebSocketHandler的afterConnectionEstablished方法,代码看上边,取出WebSocketHandshakeInterceptor中保存的用户名 查询信息后使用session.sendMessage(new TextMessage(count + ""));返回给用户,从哪来回哪去 服务端推送消息给用户 @Controller public class AdminController { static Logger logger = LoggerFactory.getLogger(AdminController.class); @Autowired(required = false) private AdminService adminService; @Bean public SystemWebSocketHandler systemWebSocketHandler() { return new SystemWebSocketHandler(); } @RequestMapping("/auditing") @ResponseBody public String auditing(HttpServletRequest request){ //无关代码都省略了 int unReadNewsCount = adminService.getUnReadNews(username); systemWebSocketHandler().sendMessageToUser(username, new TextMessage(unReadNewsCount + "")); return result; } } 在这里可以使用sendMessageToUser给某个用户推送信息,也可以使用sendMessageToUsers给所有用户推送信息
xmlns:xsi="http://w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_1.xsd">
http://
version
web-app_3_1.xsd
这两个的版本都要是3.0+
然后在这个servlet中加入
然后所有的filter中也加入
3、添加相关依赖
好了,现在websocket可以正常建立起来了
返回用户未读的消息
当连接建立后,会进入SystemWebSocketHandler的afterConnectionEstablished方法,代码看上边,取出WebSocketHandshakeInterceptor中保存的用户名
查询信息后使用session.sendMessage(new TextMessage(count + ""));返回给用户,从哪来回哪去
服务端推送消息给用户
@Controller
public class AdminController {
static Logger logger = LoggerFactory.getLogger(AdminController.class);
@Autowired(required = false)
private AdminService adminService;
@Bean
public SystemWebSocketHandler systemWebSocketHandler() {
return new SystemWebSocketHandler();
}
@RequestMapping("/auditing")
@ResponseBody
public String auditing(HttpServletRequest request){
//无关代码都省略了
int unReadNewsCount = adminService.getUnReadNews(username);
systemWebSocketHandler().sendMessageToUser(username, new TextMessage(unReadNewsCount + ""));
return result;
}
}
在这里可以使用sendMessageToUser给某个用户推送信息,也可以使用sendMessageToUsers给所有用户推送信息
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