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spring框架下websocket的搭建

2019年07月22日  | 移动技术网IT编程  | 我要评论

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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