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SSM整合WebSocket 1、首先导包<!--websocket--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-websocket</artifactId> <version>5.2.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-messaging</artifactId> <version>5.2.6.RELEASE</version> </dependency>2、WebSocketConfig.javaimport org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.EnableWebMvc; import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter; 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 @EnableWebMvc//这个标注可以不加，如果有加，要extends WebMvcConfigurerAdapter @EnableWebSocket public class WebSocketConfig extends WebMvcConfigurerAdapter implements WebSocketConfigurer { public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) { //1.注册WebSocket String websocket_url = "/websocket/socketServer"; //设置websocket的地址 registry.addHandler(webSocketHandler(), websocket_url). //注册Handler addInterceptors(new WebSocketHandshakeInterceptor()); //注册Interceptor //2.注册SockJS，提供SockJS支持(主要是兼容ie8) String sockjs_url = "/sockjs/socketServer"; //设置sockjs的地址 registry.addHandler(webSocketHandler(), sockjs_url). //注册Handler addInterceptors(new WebSocketHandshakeInterceptor()). //注册Interceptor withSockJS(); //支持sockjs协议 } @Bean public TextWebSocketHandler webSocketHandler() { return new WebSocketHandler(); } }3、WebSocketHandler.javaimport com.jam.pojo.WebSocketUser; 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; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; public class WebSocketHandler extends TextWebSocketHandler { // 已建立连接的用户 private static final ArrayList<WebSocketSession> users = new ArrayList<WebSocketSession>(); SimpleDateFormat sdf = new SimpleDateFormat("MM-dd HH:mm:ss"); /** * 处理前端发送的文本信息 js调用websocket.send时候，会调用该方法 * * @param session * @param message * @throws Exception */ @Override protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception { String username = (String) session.getAttributes().get("WEBSOCKET_USERNAME"); // 获取提交过来的消息详情 System.out.println("收到用户 " + username + " 的消息:" + message.toString()); // 分割成id和信息内容 String[] messageInfo = message.getPayload().split("@"); if (messageInfo.length != 2) { } else { String target = messageInfo[0]; String content = messageInfo[1]; // 遍历所有已连接用户 for (WebSocketSession user : users) { if (user.getAttributes().get("WEBSOCKET_USERNAME").equals(target)) { //遇到匹配用户 连接正常则发送消息 if (user.isOpen()) { sendMessageToUser(target, new TextMessage("来自\""+username+"\"的消息:"+content+"----"+sdf.format(new Date()))); }else{//若异常则发送失败 sendMessageToUser(username, new TextMessage("对方在线异常,发送失败"+"----"+sdf.format(new Date()))); } return; } } //未找到匹配用户 发送失败 sendMessageToUser(username, new TextMessage("对方暂时不在线"+"----"+sdf.format(new Date()))); } } /** * 当新连接建立的时候，被调用 连接成功时候，会触发页面上onOpen方法 * * @param session * @throws Exception */ @Override public void afterConnectionEstablished(WebSocketSession session) throws Exception { users.add(session); String username = (String) session.getAttributes().get("WEBSOCKET_USERNAME"); System.out.println("用户 " + username + " Connection Established"); session.sendMessage(new TextMessage(username + " connect")); } /** * 当连接关闭时被调用 * * @param session * @param status * @throws Exception */ @Override public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception { String username = (String) session.getAttributes().get("WEBSOCKET_USERNAME"); System.out.println("用户 " + username + " Connection closed. Status: " + status); users.remove(session); } /** * 传输错误时调用 * * @param session * @param exception * @throws Exception */ @Override public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception { String username = (String) session.getAttributes().get("WEBSOCKET_USERNAME"); if (session.isOpen()) { session.close(); } System.out.println("用户: " + username + " websocket connection closed......"); users.remove(session); } /** * 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(); } } } /** * 在线用户数 * */ public List<WebSocketUser> onlineUsers() { List<WebSocketUser> userList = new ArrayList<WebSocketUser>(); for (WebSocketSession user : users) { String username = (String) user.getAttributes().get("WEBSOCKET_USERNAME"); userList.add(new WebSocketUser(username)); } return userList; } /** * 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("WEBSOCKET_USERNAME").equals(userName)) { try { if (user.isOpen()) { user.sendMessage(message); } } catch (IOException e) { e.printStackTrace(); } break; } } } }4、WebSocketHandshakeInterceptor.javaimport org.springframework.http.server.ServerHttpRequest; import org.springframework.http.server.ServerHttpResponse; import org.springframework.http.server.ServletServerHttpRequest; import org.springframework.web.socket.WebSocketHandler; import org.springframework.web.socket.server.HandshakeInterceptor; import javax.servlet.http.HttpSession; import java.util.Map; public class WebSocketHandshakeInterceptor implements HandshakeInterceptor { @Override public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse serverHttpResponse, WebSocketHandler webSocketHandler, Map<String, Object> attributes) throws Exception { if (request instanceof ServletServerHttpRequest) { ServletServerHttpRequest servletRequest = (ServletServerHttpRequest) request; HttpSession session = servletRequest.getServletRequest().getSession(false); if (session != null) { String userName = (String) session.getAttribute("SESSION_USERNAME"); //这边获得登录时设置的唯一用户标识 if (userName == null) { userName = "未知" + session.getId(); } attributes.put("WEBSOCKET_USERNAME", userName); //将用户标识放入参数列表后，下一步的websocket处理器可以读取这里面的数据 } } return true; } public void afterHandshake(ServerHttpRequest serverHttpRequest, ServerHttpResponse serverHttpResponse, WebSocketHandler webSocketHandler, Exception e) { System.out.println("After Handshake"); } }5、WebSocketController.javaimport com.alibaba.fastjson.JSON; import com.jam.pojo.WebSocketUser; import com.jam.utils.Retmsg; import com.jam.websocket.WebSocketHandler; import org.springframework.context.annotation.Bean; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.socket.TextMessage; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; import java.text.SimpleDateFormat; import java.util.Date; import java.util.List; @RestController @RequestMapping(value="/websocket",produces = "application/json; charset=utf-8") public class WebSocketController { @Bean // 这个注解会从Spring容器拿出Bean public WebSocketHandler infoHandler() { return new WebSocketHandler(); } WebSocketHandler ws = new WebSocketHandler(); SimpleDateFormat sdf = new SimpleDateFormat("MM/dd HH:mm:ss"); //登录WebSocket保存用户名 @RequestMapping("/login") public String login(String username,HttpServletRequest request) throws Exception { System.out.println(username + "登录"); HttpSession session = request.getSession(); session.setAttribute("SESSION_USERNAME", username); return Retmsg.toJsonMsg("登录成功"); } //推送给所有用户的后台接口 @RequestMapping("/sendMsgToAllUsers") public String sendMsgToAllUsers(String username,String str){ String date = sdf.format(new Date()); str+="----"+date+"[来自 \""+username+"\" 的群发信息]"; ws.sendMessageToUsers(new TextMessage(str)); return Retmsg.toJsonMsg("发送成功"); } //获取当前在线用户名 @RequestMapping("/onlineUsers") public @ResponseBody String onlineUsers(){ List<WebSocketUser> users = ws.onlineUsers(); return JSON.toJSONString(users); } }5、JavaScript+心跳包发送<script type="text/javascript"> var websocket = null; var url = window.location.host; var url2 = window.location.href; var username = url2.split("=")[1]; var website = "http://"+url+"/websocket/sendMsgToAllUsers"; if ('WebSocket' in window) { //Websocket的连接 websocket = new WebSocket("ws://"+url+"/websocket/socketServer");//WebSocket对应的地址 } else if ('MozWebSocket' in window) { //Websocket的连接 websocket = new MozWebSocket("ws://"+url+"/websocket/socketServer");//SockJS对应的地址 } else { //SockJS的连接 websocket = new SockJS("http://"+url+"/sockjs/socketServer"); //SockJS对应的地址 } websocket.onopen = onOpen; websocket.onmessage = onMessage; websocket.onerror = onError; websocket.onclose = onClose; function onOpen(openEvt) { //alert(openEvt.Data); heartCheck.reset().start(); } function onMessage(evt) { $("#content").append(evt.data+"<br>"); // 接收后台发送的数据 heartCheck.reset().start(); } function onError() { } function onClose() { } //给指定用户发消息 function doSend() { if (websocket.readyState == websocket.OPEN) { websocket.send($("#targetName").val()+"@"+$("#inputMsg").val());//调用后台handleTextMessage方法 alert("发送成功!"); } else { alert("连接失败!"+websocket.readyState); } } //给所有用户发消息 function doSend2(){ if (websocket.readyState == websocket.OPEN) { $.get(website,{username:username,str:$("#inputMsg2").val()}); alert("发送成功!"); } else { alert("连接失败!"+websocket.readyState); } } window.close = function () { websocket.onclose(); } var heartCheck = { timeout: 55000, // 9分钟发一次心跳，比server端设置的连接时间稍微小一点，在接近断开的情况下以通信的方式去重置连接时间。 serverTimeoutObj: null, reset: function(){ clearTimeout(this.timeoutObj); clearTimeout(this.serverTimeoutObj); return this; }, start: function(){ var self = this; this.serverTimeoutObj = setInterval(function(){ if(websocket.readyState == 1){ console.log("连接状态，发送消息保持连接"); websocket.send("heartCheck"); heartCheck.reset().start(); // 如果获取到消息，说明连接是正常的，重置心跳检测 }else{ console.log("断开状态，尝试重连"); new WebSocket("ws://"+url+"/websocket/socketServer"); } }, this.timeout) } } </script>
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下半年装机分析+机械硬盘垂直/叠瓦详细 CPURyzen 4000系列下半年铺货开始，Intel11代明年才有，下半年AMD独大，涨价开始了。中端i5 10400可能比R5 3600香了，还送核显，需要配电脑的话可能越等越香。同时10月份还有RTX30系列，按照2060s超过1080的水平，3060可能可以摸到2070s的水平（可能）。3070可能比2080好一点。如果不是很急，完全不推荐现在配游戏机，老年办公其实无所谓i3 10100，i5 10400或者是R3 4350G，R5 4650G方案都可以。笔记本但对于游戏本来说，R7000系列yyds，高端系列推荐Rog幻14，冰锐2，当然买Rog，华硕全系列，到手推荐自己换个好一点的固态，PM981A或者sn750（也就是西数黑盘）。轻薄本还是联想小新AMD系列可以看，pro13,air14,15。还有个yoga14s。小新AMD系列到手建议自行更换AX200网卡。没有动手能力网上买好网卡然后去官方服务店免费换。固态对于固态来说，推荐还是买原厂为主，高端目前PM981A和西数黑盘sn750还有铠侠RD10，中端西数蓝盘sn550和铠侠RC10，入门金士顿A2000。SATA的话西数蓝盘，铠侠TC10都可以。性价比倒是考虑下西数绿盘，科赋固态不用了，有预算了可以拆下来做移动硬盘性价比很高。三星PM981A是OEM产品，就是大批量给电脑厂的，性格比高，但是有翻车几率。可以理解为工包。铠侠就是原来的东芝小白怕翻车的话还是上sn750或者RD10机械硬盘机械硬盘垂直式，东芝P300和DT01，西数1T蓝盘，希捷1T（ST1000DM010），博客文章会详细列出机械硬盘信息欢迎查询。垂直和叠瓦的区别建议百度。最后上图：
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SpingMVC中Utils工具类静态方法调用Service层 引言之前在百度、CSDN上查询了各种方法，一直都是空指针异常，原因就是static问题。先上图。之前把service层用@PostConstruct赋值后就直接用静态去获取成Settings就是这里出的问题。解决对于定义的Static变量赋值问题应该把调用的service层以及获取数据全部放在init初始化里。就不会报错。对于方法而言就直接调用就行。下面是代码@Component public class MailConfig { @Autowired private SettingsService settingsService; public static MailConfig mailConfig; private static final String PROPERTIES_DEFAULT = "mailConfig.properties"; public static String host; public static Integer port; public static String userName; public static String passWord; public static String emailForm; public static String timeout; public static String personal; public static Properties properties; @PostConstruct public void init(){ mailConfig = this; mailConfig.settingsService = this.settingsService; try { MailSettings ms = JSON.parseObject(mailConfig.settingsService.getSettings().getMailSettings(), MailSettings.class); host = ms.getMailHost(); port = new Integer(ms.getMailPort()); userName = ms.getMailUsername(); passWord = ms.getMailPassword(); emailForm = ms.getMailUsername(); timeout = ms.getMailTimeout(); personal = ms.getPersonal(); }catch (Exception e) { e.printStackTrace(); } } public static void xx(){ mailConfig.settingsService.xx(); } }
