java后台

1.添加maven依赖

<dependency> <groupId>org.springframework</groupId> <artifactId>spring-websocket</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-messaging</artifactId> <version>${spring.version}</version> </dependency>   <spring.version>4.3.7.RELEASE</spring.version>

2.创建握手

package com.ahutshop.websocket; import java.util.Map; import javax.servlet.http.HttpServletRequest; 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; /** * 此类用来获取登录用户信息并交由websocket管理 */ public class MyWebSocketInterceptor implements HandshakeInterceptor { @Override public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse arg1, WebSocketHandler arg2, Map<String, Object> arg3) throws Exception { // 将ServerHttpRequest转换成request请求相关的类，用来获取request域中的用户信息 if (request instanceof ServletServerHttpRequest) { ServletServerHttpRequest servletRequest = (ServletServerHttpRequest) request; HttpServletRequest httpRequest = servletRequest.getServletRequest(); } System.out.println("连接到我了"); return true; } @Override public void afterHandshake(ServerHttpRequest arg0, ServerHttpResponse arg1, WebSocketHandler arg2, Exception arg3) { // TODO Auto-generated method stub } }

3.创建处理器

package com.ahutshop.websocket; import java.io.IOException; import java.util.ArrayList; import java.util.List; 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; public class WebSocketPushHandler implements WebSocketHandler { private static final List<WebSocketSession> users = new ArrayList<>(); // 用户进入系统监听 @Override public void afterConnectionEstablished(WebSocketSession session) throws Exception { System.out.println("成功进入了系统。。。"); users.add(session); sendMessagesToUsers(new TextMessage("今天晚上服务器维护,请注意")); } // @Override public void handleMessage(WebSocketSession session, WebSocketMessage<?> message) throws Exception { // 将消息进行转化，因为是消息是json数据，可能里面包含了发送给某个人的信息，所以需要用json相关的工具类处理之后再封装成TextMessage， // 我这儿并没有做处理，消息的封装格式一般有{from:xxxx,to:xxxxx,msg:xxxxx}，来自哪里，发送给谁，什么消息等等 // TextMessage msg = (TextMessage)message.getPayload(); // 给所有用户群发消息 //sendMessagesToUsers(msg); // 给指定用户群发消息 //sendMessageToUser(userId, msg); } // 后台错误信息处理方法 @Override public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception { } // 用户退出后的处理，不如退出之后，要将用户信息从websocket的session中remove掉，这样用户就处于离线状态了，也不会占用系统资源 @Override public void afterConnectionClosed(WebSocketSession session, CloseStatus closeStatus) throws Exception { if (session.isOpen()) { session.close(); } users.remove(session); System.out.println("安全退出了系统"); } @Override public boolean supportsPartialMessages() { return false; } /** * 给所有的用户发送消息 */ public void sendMessagesToUsers(TextMessage message) { for (WebSocketSession user : users) { try { // isOpen()在线就发送 if (user.isOpen()) { user.sendMessage(message); } } catch (IOException e) { e.printStackTrace(); } } } /** * 发送消息给指定的用户 */ public void sendMessageToUser(String userId, TextMessage message) { for (WebSocketSession user : users) { if (user.getAttributes().get("").equals(userId)) { try { // isOpen()在线就发送 if (user.isOpen()) { user.sendMessage(message); } } catch (IOException e) { e.printStackTrace(); } } } } }

4.spring配置

javabean方式配置(推荐)

package com.ahutshop.websocket; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter; import org.springframework.web.socket.WebSocketHandler; import org.springframework.web.socket.config.annotation.EnableWebSocket; import org.springframework.web.socket.config.annotation.WebSocketConfigurer; import org.springframework.web.socket.config.annotation.WebSocketHandlerRegistry; @Configuration @EnableWebSocket public class WebSocketConfig extends WebMvcConfigurerAdapter implements WebSocketConfigurer { @Override public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) { registry.addHandler(WebSocketPushHandler(), "/webSocketServer.action").addInterceptors(new MyWebSocketInterceptor()).setAllowedOrigins("*"); registry.addHandler(WebSocketPushHandler(), "/sockjs/webSocketServer.action") .addInterceptors(new MyWebSocketInterceptor()).withSockJS(); } @Bean public WebSocketHandler WebSocketPushHandler() { return new WebSocketPushHandler(); } } spring.xml中配置扫描包  <context:component-scan base-package="com.ahutshop.websocket" />

注意:
1. /webSocketServer.action之所以要加上.action的后缀,是因为web.xmlk中配置了拦截的后缀名为.action

<servlet> <servlet-name>DispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup>  <async-supported>true</async-supported> </servlet> <servlet-mapping> <servlet-name>DispatcherServlet</servlet-name> <url-pattern>*.action</url-pattern> </servlet-mapping>

2 .setAllowedOrigins(“*”)中的*代表合法的请求域名,该方法接受一个可变数组作为参数,一定要配置,不然会请求时会出现403

xml方式配置(省略)

微信小程序

1.websocket.wxml

<view class="page"> <view class="page__hd"> </view> <view class="page__bd"> <button bindtap="connectWebsocket" type="primary">连接websocket</button> </view> </view>

2.websocket.js

// pages/websocket/websocket.js Page({ /** * 页面的初始数据 */ data: { }, connectWebsocket: function () { wx.connectSocket({ url: 'ws://localhost:8080/AhutShop/webSocketServer.action', data: { }, header: { 'content-type': 'application/json' }, method: "GET" }) wx.onSocketOpen(function (res) { console.log('WebSocket连接已打开！') }) wx.onSocketError(function (res) { console.log('WebSocket连接打开失败，请检查！') }) wx.onSocketMessage(function (res) { console.log('收到服务器内容：' + res.data) }) } })

微信小程序websocket,后台SSM(SpringMVC+Spring+Mybatis)