websocket的两种实现方式:1基于注解,2与spring整合
2017-05-27 15:26
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1:注解方式简单明了
服务端代码
客户端代码:
2:与spring整合
服务端代码
WebSocketConfig.Java
这个类是配置类,所以需要在spring mvc配置文件中加入对这个类的扫描,第一个addHandler是对正常连接的配置,第二个是如果浏览器不支持websocket,使用socketjs模拟websocket的连接。
ChatHandshakeInterceptor.java
这个类的作用就是在连接成功前和成功后增加一些额外的功能,Constants.java类是一个工具类,两个常量。
ChatMessageHandler.java
这个类是对消息的一些处理,比如是发给一个人,还是发给所有人,并且前端连接时触发的一些动作
package com.websocket;
import java.io.IOException;
import java.util.ArrayList;
import org.apache.log4j.Logger;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.TextWebSocketHandler;
public class ChatMessageHandler extends TextWebSocketHandler {
private static final ArrayList<WebSocketSession> users;// 这个会出现性能问题,最好用Map来存储,key用userid
private static Logger logger = Logger.getLogger(ChatMessageHandler.class);
static {
users = new ArrayList<WebSocketSession>();
}
/**
* 连接成功时候,会触发UI上onopen方法
*/
@Override
public void afterConnectionEstablished(WebSocketSession session) throws Exception {
System.out.println("connect to the websocket success......");
users.add(session);
// 这块会实现自己业务,比如,当用户登录后,会把离线消息推送给用户
// TextMessage returnMessage = new TextMessage("你将收到的离线");
// session.sendMessage(returnMessage);
}
/**
* 在UI在用js调用websocket.send()时候,会调用该方法
*/
@Override
protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
sendMessageToUsers(message);
//super.handleTextMessage(session, message);
}
/**
* 给某个用户发送消息
*
* @param userName
* @param message
*/
public void sendMessageToUser(String userName, TextMessage message) {
for (WebSocketSession user : users) {
if (user.getAttributes().get(Constants.WEBSOCKET_USERNAME).equals(userName)) {
try {
if (user.isOpen()) {
user.sendMessage(message);
}
} catch (IOException e) {
e.printStackTrace();
}
break;
}
}
}
/**
* 给所有在线用户发送消息
*
* @param message
*/
public void sendMessageToUsers(TextMessage message) {
for (WebSocketSession user : users) {
try {
if (user.isOpen()) {
user.sendMessage(message);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Override
public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception {
if (session.isOpen()) {
session.close();
}
logger.debug("websocket connection closed......");
users.remove(session);
}
@Override
public void afterConnectionClosed(WebSocketSession session, CloseStatus closeStatus) throws Exception {
logger.debug("websocket connection closed......");
users.remove(session);
}
@Override
public boolean supportsPartialMessages() {
return false;
}
}
服务端代码
package controller; import java.io.IOException; import java.util.Collections; import java.util.HashSet; import java.util.LinkedList; import java.util.List; import java.util.Set; import javax.websocket.CloseReason; import javax.websocket.OnClose; import javax.websocket.OnError; import javax.websocket.OnMessage; import javax.websocket.OnOpen; import javax.websocket.Session; import javax.websocket.server.ServerEndpoint; @ServerEndpoint("/chatServer") public class Chat { private static Set<Session> sessions = Collections.synchronizedSet(new HashSet<Session>()); private static List<String> messages = Collections.synchronizedList(new LinkedList<String>()); @OnOpen public void onOpen(Session session) { System.out.println("Session: " + session.getId() + " connected!"); sessions.add(session); System.out.println("目前信息数: "+messages.size()); for(String message : messages){ try { session.getBasicRemote().sendText(message); } catch (IOException e) { e.printStackTrace(); } } } @OnMessage public void onMessage(String message, Session session) throws InterruptedException { System.out.println("session : "+session.getId() + " : " + message); messages.add(message); System.out.println("当前用户数: "+sessions.size()); System.out.println("信息数:"+ messages.size()); for(Session s : sessions){ try { Thread.sleep(10000); s.getBasicRemote().sendText(message); } catch (IOException e) { System.out.println("出现异常"); e.printStackTrace(); } } } @OnClose public void onClose(Session session, CloseReason reason) { sessions.remove(session); System.out.println("Closed : " + session.getId()); } @OnError public void onError(Throwable t) { System.out.println("Error : " + t.getMessage()); t.printStackTrace(); } }
客户端代码:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>chat Demo</title> <style> * { margin: 0; padding: 0; font-family: "微软雅黑"; } #mainFrame { float: left; padding: 20px; border: 1px solid gray; border-radius: 3px; text-align: center; } #userName { width: 500px; height: 30px; border: 1px solid gray; border-radius: 3px; } #msgContainer { text-align: left; margin: 15px 0; width: 640px; height: 480px; overflow: auto; border: 1px solid gray; border-radius: 3px; } #sendText { width: 560px; height: 30px; border: 1px solid gray; border-radius: 3px; } input[type="button"] { width: 60px; height: 30px; border: 1px solid gray; border-radius: 3px; } </style> </head> <body> <div id="mainFrame"> 用户名:<input type="text" id="userName"> <div id="msgContainer"></div> <input type="text" id="sendText"> <input type="button" value="发送" onclick="send()"> </div> <script> var msgContainer = document.getElementById("msgContainer"); //服务器地址 var url = "ws://127.0.0.1:8080/TestWebSocket/chatServer"; //创建WebSocket对象 var ws = new WebSocket(url); //与服务器建立连接 ws.onopen = function(){ console.info("connected!"); } //接收到服务器发来的信息 ws.onmessage = function(mes) { msgContainer.innerHTML = msgContainer.innerHTML + mes.data; //将数据加载到信息框 msgContainer.scrollTop = msgContainer.scrollHeight; //使信息框滚动条定位到最下边 } //服务器关闭 ws.onclose = function() { console.info("close"); } //服务器异常 ws.onerror = function() { console.info("error"); } //浏览器刷新或者关闭时,先关闭当前页面的WebSocket对象 window.onbeforeunload = function(){ ws.close(); } //发送信息 function send(){ var userName = document.getElementById("userName"); var sendText = document.getElementById("sendText"); if(userName.value ==""){ alert("请输入用户名!"); return; } if(sendText.value == "") return; //调用WebSocket发送信息的方法,向服务器发送信息 ws.send("<span style='color:green;font-size:12px;font-family:\"微软雅黑\"'>"+userName.value+":</span><br><span style='color:gray;font-size:16px;font-family:\"微软雅黑\"'>"+sendText.value+"</span><br><div style='border-top:1px dotted gray;'></div>"); sendText.value = ""; } </script> </body> </html>
2:与spring整合
服务端代码
WebSocketConfig.Java
这个类是配置类,所以需要在spring mvc配置文件中加入对这个类的扫描,第一个addHandler是对正常连接的配置,第二个是如果浏览器不支持websocket,使用socketjs模拟websocket的连接。
package com.websocket; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; 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 WebSocketConfig implements WebSocketConfigurer {
//这个方法的作用主要是用于注册建立握手之前的拦截造作, @Override public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) { registry.addHandler(chatMessageHandler(),"/webSocketServer").addInterceptors(new ChatHandshakeInterceptor( a66c )); registry.addHandler(chatMessageHandler(), "/sockjs/webSocketServer").addInterceptors(new ChatHandshakeInterceptor()).withSockJS(); }
//这个是socket信息处理类 @Bean public TextWebSocketHandler chatMessageHandler(){ return new ChatMessageHandler(); } }
ChatHandshakeInterceptor.java
这个类的作用就是在连接成功前和成功后增加一些额外的功能,Constants.java类是一个工具类,两个常量。
package com.websocket; import java.util.Map; import org.apache.shiro.SecurityUtils; import org.springframework.http.server.ServerHttpRequest; import org.springframework.http.server.ServerHttpResponse; import org.springframework.web.socket.WebSocketHandler; import org.springframework.web.socket.server.support.HttpSessionHandshakeInterceptor; public class ChatHandshakeInterceptor extends HttpSessionHandshakeInterceptor { @Override public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Map<String, Object> attributes) throws Exception { System.out.println("Before Handshake"); /* * if (request instanceof ServletServerHttpRequest) { * ServletServerHttpRequest servletRequest = (ServletServerHttpRequest) * request; HttpSession session = * servletRequest.getServletRequest().getSession(false); if (session != * null) { //使用userName区分WebSocketHandler,以便定向发送消息 String userName = * (String) session.getAttribute(Constants.SESSION_USERNAME); if * (userName==null) { userName="default-system"; } * attributes.put(Constants.WEBSOCKET_USERNAME,userName); * * } } */ //使用userName区分WebSocketHandler,以便定向发送消息(使用shiro获取session,或是使用上面的方式) String userName = (String) SecurityUtils.getSubject().getSession().getAttribute(Constants.SESSION_USERNAME); if (userName == null) { userName = "default-system"; } attributes.put(Constants.WEBSOCKET_USERNAME, userName); /** 可以用这个逻辑也可以不用 Long uid = Long.valueOf(((ServletServerHttpRequest) request).getServletRequest().getParameter("uid")); String wsDevice = String.valueOf(((ServletServerHttpRequest) request).getServletRequest().getParameter("wsDevice")); if (request instanceof ServletServerHttpRequest) { if (uid != null) { attributes.put("uid", uid); attributes.put("wsDevice", wsDevice); } else { return false; } } return true; */ return super.beforeHandshake(request, response, wsHandler, attributes); } @Override public void afterHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Exception ex) { System.out.println("After Handshake"); super.afterHandshake(request, response, wsHandler, ex); } }
ChatMessageHandler.java
这个类是对消息的一些处理,比如是发给一个人,还是发给所有人,并且前端连接时触发的一些动作
package com.websocket;
import java.io.IOException;
import java.util.ArrayList;
import org.apache.log4j.Logger;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.TextWebSocketHandler;
public class ChatMessageHandler extends TextWebSocketHandler {
private static final ArrayList<WebSocketSession> users;// 这个会出现性能问题,最好用Map来存储,key用userid
private static Logger logger = Logger.getLogger(ChatMessageHandler.class);
static {
users = new ArrayList<WebSocketSession>();
}
/**
* 连接成功时候,会触发UI上onopen方法
*/
@Override
public void afterConnectionEstablished(WebSocketSession session) throws Exception {
System.out.println("connect to the websocket success......");
users.add(session);
// 这块会实现自己业务,比如,当用户登录后,会把离线消息推送给用户
// TextMessage returnMessage = new TextMessage("你将收到的离线");
// session.sendMessage(returnMessage);
}
/**
* 在UI在用js调用websocket.send()时候,会调用该方法
*/
@Override
protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
sendMessageToUsers(message);
//super.handleTextMessage(session, message);
}
/**
* 给某个用户发送消息
*
* @param userName
* @param message
*/
public void sendMessageToUser(String userName, TextMessage message) {
for (WebSocketSession user : users) {
if (user.getAttributes().get(Constants.WEBSOCKET_USERNAME).equals(userName)) {
try {
if (user.isOpen()) {
user.sendMessage(message);
}
} catch (IOException e) {
e.printStackTrace();
}
break;
}
}
}
/**
* 给所有在线用户发送消息
*
* @param message
*/
public void sendMessageToUsers(TextMessage message) {
for (WebSocketSession user : users) {
try {
if (user.isOpen()) {
user.sendMessage(message);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Override
public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception {
if (session.isOpen()) {
session.close();
}
logger.debug("websocket connection closed......");
users.remove(session);
}
@Override
public void afterConnectionClosed(WebSocketSession session, CloseStatus closeStatus) throws Exception {
logger.debug("websocket connection closed......");
users.remove(session);
}
@Override
public boolean supportsPartialMessages() {
return false;
}
}
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