如何在spring环境中搭建websocket

发布时间：2020-11-12 16:17:45 阅读：220 作者：Leah 栏目：编程语言

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今天就跟大家聊聊有关如何在spring环境中搭建websocket，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。

本文基于Apach Tomcat 8.0.3+MyEclipse+maven+JDK1.7

spring4.0以后加入了对websocket技术的支持，撸主目前的项目用的是SSM（springMVC+spring+MyBatis）框架，所以肯定要首选spring自带的websocket

1 在maven的pom.xml中加入websocket所依赖的jar包

<dependency>
 <groupId>com.fasterxml.jackson.core</groupId>
 <artifactId>jackson-core</artifactId>
 <version>2.4.0</version>
</dependency>
<dependency>
 <groupId>com.fasterxml.jackson.core</groupId>
 <artifactId>jackson-databind</artifactId>
 <version>2.4.0</version>
</dependency>
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-websocket</artifactId>//version须和spring mvc的version保持一致，否则会出现问题
  <version>4.0.5.RELEASE</version>
</dependency>
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-messaging</artifactId>
  <version>4.0.5.RELEASE</version>
</dependency>

2 更新spring-mvc.xml中namespace.xsd的版本

<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns:websocket="http://www.springframework.org/schema/websocket"
   xsi:schemaLocation="
    http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
  http://www.springframework.org/schema/websocket http://www.springframework.org/schema/websocket/spring-websocket.xsd">

处理类和握手协议的spring配置(applicationContext.xml文件）

<bean id="websocket" class="com.xl.websocket.handler"/>

<websocket:handlers>
  <websocket:mapping path="/websocket" handler="websocket"/>
  <websocket:handshake-interceptors>
  <bean class="com.xl.websocket.HandshakeInterceptor"/>
  </websocket:handshake-interceptors>
　　 <websocket:sockjs/>
</websocket:handlers>

webconfig

@Override
public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
 　　　　 registry.addHandler(new HelloHandler(), "/hello").addInterceptors(new HandshakeInterceptor()).withSockJS().setHttpMessageCacheSize(20000);

　　　　}

3 创建握手（handshake）接口

public class HandshakeInterceptor extends HttpSessionHandshakeInterceptor {
 @Override
 public boolean beforeHandshake(ServerHttpRequest arg0,
  ServerHttpResponse arg1, WebSocketHandler arg2,
  Map<String, Object> arg3) throws Exception {
 
 System.out.println("---- Before Handshake ----");
 return super.beforeHandshake(arg0, arg1, arg2, arg3);
 }
 
 @Override
 public void afterHandshake(ServerHttpRequest request,
  ServerHttpResponse response, WebSocketHandler wsHandler,
  Exception ex) {
 
 System.out.println("---- After Handshake ----");
 super.afterHandshake(request, response, wsHandler, ex);
 }
}

4 创建websocket处理类

public class HelloHandler extends TextWebSocketHandler {
 
 public static List<WebSocketSession> users;
 static{
 users = new ArrayList<WebSocketSession>();
 }
 
 @Override
  public void handleTextMessage(WebSocketSession session, TextMessage message) {
    //接收到客户端消息时调用
    System.out.println("text message: " + session.getId() + "-" + message.getPayload());
  }

  @Override
  public void afterConnectionEstablished(WebSocketSession session)
      throws Exception {
    // 与客户端完成连接后调用
    System.out.println("afterConnectionEstablished");
    System.out.println("getId:" + session.getId());
    System.out.println("getLocalAddress:" + session.getLocalAddress().toString());
    System.out.println("getTextMessageSizeLimit:" + session.getTextMessageSizeLimit());
    System.out.println("getUri:" + session.getUri().toString());
    System.out.println("getPrincipal:" + session.getPrincipal());
    System.out.println(soslistService.getsss());
    session.sendMessage(new TextMessage("你好"));
    
    users.add(session);
  }

  @Override
  public void handleTransportError(WebSocketSession session,
      Throwable exception) throws Exception {
    // 消息传输出错时调用
    System.out.println("handleTransportError");
  }

  @Override
  public void afterConnectionClosed(WebSocketSession session,
      CloseStatus closeStatus) throws Exception {
    // 一个客户端连接断开时关闭
    System.out.println("afterConnectionClosed");
  }

  @Override
  public boolean supportsPartialMessages() {
    // TODO Auto-generated method stub
    return false;
  }
}

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