dao层使用jpa
1.数据库三张表的表结构
message表,消息信息表
message_receive接受消息表
subscrib订阅消息表
我想的是发送消息根据订阅表中的订阅类型发送到某某人那里,缺少一张消息类型表,如果需要可以加上
2.WebSocket配置类
@Configuration
public class WebSocketConfig {
@Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
}
3.因为MyWebScoket中的session没有存储HttpSession中的信息,需要将HttpSession加入到MyWebScoket中,以获取用户信息,否则获取不到用户信息,
public class GetHttpSessionConfigurator extends ServerEndpointConfig.Configurator {
@Override
public void modifyHandshake(ServerEndpointConfig sec,
HandshakeRequest request, HandshakeResponse response) {
HttpSession httpSession=(HttpSession) request.getHttpSession();
sec.getUserProperties().put(HttpSession.class.getName(),httpSession);
}
}
4.myWebScoket测试类,使用map用来存放每个客户端对应的MyWebSocket对象和用户名字关联,以便发送消息时
根据订阅信息查询并通知在线用户查看信息
@ServerEndpoint(value = "/websocket",configurator=GetHttpSessionConfigurator.class)
@Component
public class MyWebSocket {
//静态变量,用来记录当前在线连接数。应该把它设计成线程安全的。
private static int onlineCount = 0;
//concurrent包的线程安全Map,用来存放每个客户端对应的MyWebSocket对象。
private static CopyOnWriteMap webSocketSet = new CopyOnWriteMap<>();
//与某个客户端的连接会话,需要通过它来给客户端发送数据
private Session session;
/**
* 连接建立成功调用的方法*/
@OnOpen
public void onOpen(Session session) {
this.session = session;
User user = getUserInfo();
webSocketSet.put(user.getUsername(),this); //加入set中
addOnlineCount(); //在线数加1
System.out.println("有新连接加入!当前在线人数为" + getOnlineCount());
/*try {
sendMessage("连接成功,当前的人数是"+getOnlineCount());
} catch (IOException e) {
System.out.println("IO异常");
}*/
}
/**
* 连接关闭调用的方法
*/
@OnClose
public void onClose() {
User user = getUserInfo();
webSocketSet.remove(user.getUsername()); //从set中删除
subOnlineCount(); //在线数减1
System.out.println("有一连接关闭!当前在线人数为" + getOnlineCount());
}
/**
* 收到客户端消息后调用的方法
*
* @param messageJson 客户端发送过来的消息*/
@OnMessage
public void onMessage(String messageJson) {
JSONObject jsonObject = JSON.parseObject(messageJson);
Message message = jsonObject.toJavaObject(Message.class);
//获取消息创建人和创建时间
message.setCreator(getUserInfo().getId());
message.setCreateTime(LocalDateTime.now());
System.out.println("来自客户端的消息:" + message.getContent());
//获取spring容器内的SubscribService
SubscribService subscribService = SpringContextUtils.getBean(SubscribService.class);
MessageService messageService = SpringContextUtils.getBean(MessageService.class);
MessageReceiveService messageReceiveService = SpringContextUtils.getBean(MessageReceiveService.class);
//保存消息信息到数据库
Message messageData = messageService.save(message);
//获取订阅信息,根据订阅信息把信息转发到指定的用户
List subscribs = subscribService.findAllByType(message.getType());
for (Subscrib su:subscribs) {
//新增消息接收信息
MessageReceive messageReceive = new MessageReceive();
messageReceive.setIsRead(0);
messageReceive.setMessageId(messageData.getId());
messageReceive.setCreateTime(LocalDateTime.now());
messageReceive.setReceiver(su.getSubscriber());
//保存消息接收信息到数据库
messageReceiveService.save(messageReceive);
//群发消息
for (String sub : webSocketSet.keySet()) {
if(su.getSubscriber().equals(sub)){
MyWebSocket item = webSocketSet.get(sub);
try {
item.sendMessage(message.getContent());
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
// 发生错误时调用
@OnError
public void onError(Throwable error) {
System.out.println("发生错误");
error.printStackTrace();
}
public void sendMessage(String message) throws IOException {
this.session.getBasicRemote().sendText(message);
//this.session.getAsyncRemote().sendText(message);
}
private User getUserInfo(){
return (User)((HttpSession)session.getUserProperties().get(HttpSession.class.getName())).getAttribute("user");
}
public static synchronized int getOnlineCount() {
return onlineCount;
}
public static synchronized void addOnlineCount() {
MyWebSocket.onlineCount++;
}
public static synchronized void subOnlineCount() {
MyWebSocket.onlineCount--;
}
}
获取ioc容器中bean的工具类
@Component
public class SpringContextUtils implements ApplicationContextAware {
/**
* 上下文对象实例
*/
private static ApplicationContext applicationContext;
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
this.applicationContext = applicationContext;
}
/**
* 获取applicationContext
*
* @return
*/
public static ApplicationContext getApplicationContext() {
return applicationContext;
}
/**
* 通过name获取 Bean.
*
* @param name
* @return
*/
public static Object getBean(String name) {
return getApplicationContext().getBean(name);
}
/**
* 通过class获取Bean.
*
* @param clazz
* @param
* @return
*/
public static T getBean(Class clazz) {
return getApplicationContext().getBean(clazz);
}
/**
* 通过name,以及Clazz返回指定的Bean
*
* @param name
* @param clazz
* @param
* @return
*/
public static T getBean(String name, Class clazz) {
return getApplicationContext().getBean(name, clazz);
}
}
前端页面,测试是类型输入1,页面下方js最好封装到公共js里面,主界面引入一下。
发送消息页面
Welcome
标题:
类型:
内容:
必须登录,然后将信息存储到session中
在页面上输入信息发送,在另外一个浏览器中使用订阅人登录就能自动弹出信息框了。