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在Java項目中使用websocket實現消息推送功能？相信很多沒有經驗的人對此束手無策，為此本文總結了問題出現的原因和解決方法，通過這篇文章希望你能解決這個問題。
一.服務層
package com.demo.websocket;
import java.io.IOException;
import java.util.Iterator;
import java.util.concurrent.ConcurrentLinkedQueue;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.config.annotation.EnableWebSocket;
import org.springframework.web.socket.config.annotation.WebSocketConfigurer;
import org.springframework.web.socket.config.annotation.WebSocketHandlerRegistry;
import org.springframework.web.socket.handler.TextWebSocketHandler;
@Configuration
@EnableWebSocket
public class websocketListener implements WebSocketConfigurer, ServletContextListener{
private ConcurrentLinkedQueue<WebSocketSession> sessions = new ConcurrentLinkedQueue<WebSocketSession>();
private WebSocketHandlerTest handler;
@Override
public void contextDestroyed(ServletContextEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void contextInitialized(ServletContextEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
handler = new WebSocketHandlerTest();
registry.addHandler(handler, "/ws/notifymessage.ws");
registry.addHandler(handler, "/ws/sockjs/notifymessage.ws").withSockJS();
new Thread(handler).start();
}
class WebSocketHandlerTest extends TextWebSocketHandler implements Runnable{
@Override
public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
sessions.remove(session);
}
@Override
public void afterConnectionEstablished(WebSocketSession session) throws Exception {
sessions.add(session);
}
@Override
protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
super.handleTextMessage(session, message);
}
@Override
public void run() {
System.out.println("等待推送....");
try {
int i = 0;
for (;;) {
synchronized (this) {
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(i%10==0){
nofity("消息推送測試......");
System.out.println("推送消息了....");
}else{
System.out.println("本次不推送消息了....");
}
i++;
}
} catch (IOException e) {
e.printStackTrace();
System.out.println("失敗....");
}
}
private void nofity(String message) throws IOException {
Iterator<WebSocketSession> iterator = sessions.iterator();
while (iterator.hasNext()) {
WebSocketSession session = iterator.next();
synchronized(session){
if(session.isOpen()){
session.sendMessage(new TextMessage(message));
}else{
iterator.remove();
}
}
}
}
}
}二.前臺界面監聽
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
websocket測試界面
</body>
<script type="text/javascript">
var websocketPath = "localhost:8080/demo-web";
if ('WebSocket' in window) {
websocket = new WebSocket("ws://"+websocketPath+"/ws/notifymessage.ws");
} else if ('MozWebSocket' in window) {
websocket = new MozWebSocket("ws://"+websocketPath+"/ws/notifymessage.ws");
} else {
websocket = new SockJS("ws://"+websocketPath+"/ws/notifymessage.ws");
}
websocket.onopen = function (evnt) {
};
websocket.onmessage = function (evnt) {
console.log(evnt);
};
websocket.onerror = function (evnt) {
};
websocket.onclose = function (evnt) {
}
</script>
</html>注意web.xml中配置DispatcherServlet控制器
spring-servlet.xml空文件
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>*.ws</url-pattern>
</servlet-mapping>看完上述內容，你們掌握在Java項目中使用websocket實現消息推送功能的方法了嗎？如果還想學到更多技能或想了解更多相關內容，歡迎關注億速云行業資訊頻道，感謝各位的閱讀！
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