微信小程序实现websocket步骤:
后台:
1. 添加maven依赖 2. 创建握手 3. 创建处理器 4. spring配置(xml配置或javabean方式配置任选一种)
微信小程序:
1. 书写连接
java后台
1.添加maven依赖
<!-- websocket -->
<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>
<!-- 其中spring版本 -->
<!-- 注意spring版本一定要为4以上版本 -->
<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
<!-- 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
<!-- springmvc模块 --> <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> <!-- 支持异步 --> <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
<!--pages/websocket/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)
})
}
})
运行效果