下面我将为你详细讲解“WebSocket整合SSM的实现示例”攻略。
一、实现方案
我们的实现方案是使用Spring+Struts2+MyBatis构建一个SSM项目并整合WebSocket。
1.1 准备工作
首先需要准备以下开发环境
- JDK 1.8
- Eclipse
- Tomcat 8.0及以上版本
- Maven
1.2 导入项目
使用Maven创建一个Web项目,在Eclipse中导入项目即可。
1.3 引入WebSocket支持
在pom.xml文件中加入以下依赖:
<dependency>
<groupId>javax.websocket</groupId>
<artifactId>javax.websocket-api</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-websocket</artifactId>
<version>8.0.3</version>
</dependency>
1.4 配置WebSocket
编写一个WebSocketServer类,并在web.xml文件中增加以下配置:
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>WebSocketServlet</servlet-name>
<servlet-class>org.apache.tomcat.websocket.server.WsSci</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>WebSocketServlet</servlet-name>
<url-pattern>/websocket/*</url-pattern>
</servlet-mapping>
1.5 实现WebSocket
在我们的SSM项目中,WebSocket是用来实现服务端与客户端的实时通信的。下面是一个简单的WebSocket实现示例。
@Service
@ServerEndpoint(value = "/ws")
public class WebSocketServer {
private static final Set<Session> sessions = new HashSet<>();
@OnOpen
public void onOpen(Session session) throws IOException {
sessions.add(session);
broadcast("新的连接:" + session.getId() + ", online count:" + sessions.size());
}
@OnClose
public void onClose(Session session) throws IOException {
sessions.remove(session);
broadcast("关闭:" + session.getId() + ", online count:" + sessions.size());
}
@OnMessage
public void onMessage(Session session, String message) throws IOException {
broadcast(session.getId() + ":" + message);
}
@OnError
public void onError(Session session, Throwable throwable) {
System.out.println("Session ID:" + session.getId() + ", Throwable:" + throwable.getMessage());
}
private static void broadcast(String message) throws IOException {
for (Session session : sessions) {
if (session.isOpen()) {
session.getBasicRemote().sendText(message);
}
}
}
}
1.6 整合SSM
在我们编写的WebSocketServer类中,通过注解@Service将其定义为Spring Bean,同时,在web.xml中加入以下配置:
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:applicationContext*.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<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>
</servlet>
<servlet-mapping>
<servlet-name>DispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
1.7 测试
在浏览器中打开WebSocket URL,在调试器中即可看到WebSocket的相关信息。
二、示例
下面提供两个简单的SSM项目整合WebSocket的示例,供大家参考。
2.1 Spring整合WebSocket
@Service
@ServerEndpoint(value = "/chat")
public class WebSocketServer {
private static final List<Session> SESSIONS = new CopyOnWriteArrayList<>();
@OnMessage
public void onMessage(Session session, String message) throws IOException {
for (Session s : SESSIONS) {
s.getBasicRemote().sendText(message);
}
}
@OnOpen
public void onOpen(Session session) {
SESSIONS.add(session);
System.out.println(session.getId() + "与服务器成功建立WebSocket连接,当前连接数为" + SESSIONS.size());
}
@OnClose
public void onClose(Session session) {
SESSIONS.remove(session);
System.out.println(session.getId() + "与服务器断开WebSocket连接,当前连接数为" + SESSIONS.size());
}
@OnError
public void onError(Session session, Throwable throwable) {
System.out.println("WebSocket错误:" + throwable.getMessage());
}
}
2.2 Struts2整合WebSocket
@Service
@ServerEndpoint(value = "/ws/chat")
public class WebSocketServer {
private static final Set<Session> sessions = Collections.synchronizedSet(new HashSet<Session>());
@OnOpen
public void onOpen(Session session) {
sessions.add(session);
}
@OnClose
public void onClose(Session session) {
sessions.remove(session);
}
@OnMessage
public void onMessage(Session session, String message) throws IOException {
broadcast(message);
}
@OnError
public void onError(Session session, Throwable throwable) {
System.out.println(throwable.getMessage());
}
private void broadcast(String message) throws IOException {
for (Session session : sessions) {
if (session.isOpen()) {
session.getBasicRemote().sendText(message);
}
}
}
}
以上就是WebSocket整合SSM的实现示例的完整攻略了,希望对你有帮助。
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