SpringBoot+WebSocket

作者: 螃蟹和骆驼先生Yvan | 来源:发表于2018-08-24 11:30 被阅读8次

    1.前言

    前两天我一个开发好友跑过来问我websocket的问题,虽然搭建出来了,但是就是不成功!之前我没搭建过,只是之前的开发妹子搭建的我参考用的,里面大致原因什么的我也不是很清楚。今天来解释一下何为WebSocket !
    先了解一下http请求和WebSocket区别:
    http协议是用在应用层的协议,他是基于tcp协议的,是一问一答模式,要求每次请求都要三次握手才能发送自己的信息
    而WebSocket没有这个限制,为了解决客户端发起多个http请求到服务器资源浏览器必须要经过长时间的轮训问题而生的,他实现了多路复用,他是全双工通信。在webSocket协议下客服端和浏览器可以同时发送信息。websocket是为聊天诞生的,聊天不用等朋友一问一答那样,想怎么聊发多少自己决定。开始今天重点吧!

    2.依赖

    <?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>websocket</groupId>
        <artifactId>websocket</artifactId>
        <version>1.0-SNAPSHOT</version>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>1.3.3.RELEASE</version>
        </parent>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <!-- spring session -->
            <dependency>
                <groupId>org.springframework.session</groupId>
                <artifactId>spring-session</artifactId>
                <version>1.3.0.RELEASE</version>
            </dependency>
    
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>1.16.18</version>
            </dependency>
    
            <!-- websocket dependency -->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-websocket</artifactId>
                <version>1.3.5.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>javax</groupId>
                <artifactId>javaee-api</artifactId>
                <version>7.0</version>
                <scope>provided</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-thymeleaf</artifactId>
            </dependency>
        </dependencies>
        <build>
            <finalName>SpringSession</finalName>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin </artifactId>
                </plugin>
            </plugins>
        </build>
    </project>
    

    3.配置作用:首先要注入ServerEndpointExporter,这个bean会自动注册使用了@ServerEndpoint注解声明的Websocket endpoint。

    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.socket.server.standard.ServerEndpointExporter;
    
    @Configuration
    public class WebSocketConfig {
    
        @Bean
        public ServerEndpointExporter serverEndpointExporter() {
    
            return new ServerEndpointExporter();
        }
    }
    

    4.ServerEndpoint注解

    import java.io.IOException;
    import java.util.concurrent.CopyOnWriteArraySet;
    import javax.websocket.OnClose;
    import javax.websocket.OnMessage;
    import javax.websocket.OnOpen;
    import javax.websocket.Session;
    import javax.websocket.server.ServerEndpoint;
    import org.springframework.stereotype.Component;
    
    /**
     * Created by 螃蟹和骆驼先生Yvan on 2018/8/24.
     */
    
    @ServerEndpoint(value = "/websocket")
    @Component
    public class WebSocketServer {
        //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Set,用来存放每个客户端对应的MyWebSocket对象。
        private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();
    
        //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;
            webSocketSet.add(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("欢迎来到欢乐一家!!!");
            } catch (IOException e) {
                System.out.println("IO异常");
            }
        }
    
        /**
         * 连接关闭调用的方法
         */
        @OnClose
        public void onClose() {
            webSocketSet.remove(this); //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 message 客户端发送过来的消息*/
        @OnMessage
        public void onMessage(String message, Session session) {
            System.out.println("来自客户端的消息:" + message);
    
            //群发消息
            for (WebSocketServer item : webSocketSet) {
                try {
                    item.sendMessage(message);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    
        /**
         * 发生错误时调用
         @OnError
         **/
         public void onError(Session session, 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);
         }
    
    
         /**
          * 群发自定义消息
          * */
        public static void sendInfo(String message) throws IOException {
            for (WebSocketServer item : webSocketSet) {
                System.out.println("钱勇万牛逼!!!");
                try {
                    item.sendMessage(message);
                } catch (IOException e) {
                    continue;
                }
            }
        }
    
        public static synchronized int getOnlineCount() {
            return onlineCount;
        }
    
        public static synchronized void addOnlineCount() {
            WebSocketServer.onlineCount++;
        }
    
        public static synchronized void subOnlineCount() {
            WebSocketServer.onlineCount--;
        }
    }
    

    4.Controller层

    import com.websocket.lease.config.WebSocketServer;
    import java.io.IOException;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.ResponseBody;
    import org.springframework.web.bind.annotation.RestController;
    /**
     * Created by 螃蟹和骆驼先生Yvan on 2018/8/24.
     */
    @Controller
    public class WebController {
        @RequestMapping(value="/publicSend",method= RequestMethod.GET)
        public String pushVideoListToWeb2(String id) {
            return "success";
    
        }
    }
    

    5.启动类APP

    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.context.web.SpringBootServletInitializer;
    /**
     * Created by 螃蟹和骆驼先生Yvan on 2018/8/24.
     */
    @SpringBootApplication
    public class App extends SpringBootServletInitializer {
            public static void main(String[] args) {
                SpringApplication.run(App.class, args);
            }
    
    }
    

    6.application.properties配置类

    spring.thymeleaf.prefix=classpath:/templates/
    

    7.success.html成功类 存放在/main/java/resource/templates/

    import java.io.IOException;
    import java.util.concurrent.CopyOnWriteArraySet;
    import javax.websocket.OnClose;
    import javax.websocket.OnMessage;
    import javax.websocket.OnOpen;
    import javax.websocket.Session;
    import javax.websocket.server.ServerEndpoint;
    import org.springframework.stereotype.Component;
    
    /**
     * Created by 螃蟹和骆驼先生Yvan on 2018/8/24.
     */
    
    @ServerEndpoint(value = "/websocket")
    @Component
    public class WebSocketServer {
        //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Set,用来存放每个客户端对应的MyWebSocket对象。
        private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();
    
        //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;
            webSocketSet.add(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("螃蟹和骆驼先生Yvan!!!");
            } catch (IOException e) {
                System.out.println("IO异常");
            }
        }
    
        /**
         * 连接关闭调用的方法
         */
        @OnClose
        public void onClose() {
            webSocketSet.remove(this); //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 message 客户端发送过来的消息*/
        @OnMessage
        public void onMessage(String message, Session session) {
            System.out.println("来自客户端的消息:" + message);
    
            //群发消息
            for (WebSocketServer item : webSocketSet) {
                try {
                    item.sendMessage(message);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    
        /**
         * 发生错误时调用
         @OnError
         **/
         public void onError(Session session, Throwable error) {
         System.out.println("发生错误");
         error.printStackTrace();
         }
    
    
         public void sendMessage(String message) throws IOException {
         this.session.getBasicRemote().sendText(message);//getBasicRemote是阻塞式的同步  比如2个发送,要两个同步发送完成,第一个发送快要结束,第二个发送一点点,第一个就要等第二个
         this.session.getAsyncRemote().sendText(message);//getAsyncRemote是非阻塞式的异步,建议使用
         }
    
    
         /**
          * 群发自定义消息
          * */
        public static void sendInfo(String message) throws IOException {
            for (WebSocketServer item : webSocketSet) {
                System.out.println("钱勇万你真牛逼");
                try {
                    item.sendMessage(message);
                } catch (IOException e) {
                    continue;
                }
            }
        }
    
        public static synchronized int getOnlineCount() {
            return onlineCount;
        }
    
        public static synchronized void addOnlineCount() {
            WebSocketServer.onlineCount++;
        }
    
        public static synchronized void subOnlineCount() {
            WebSocketServer.onlineCount--;
        }
    }
    

    8.测试结果是两个:因为我用了阻塞的发送方法getBasicRemote和非阻塞发送方法getAsyncRemote():


    发送两次

    代码地址链接: https://pan.baidu.com/s/1q1SI23zVAOwV-JUBucm31g 密码: 6w2i

    相关文章

      网友评论

      • EternalCode:ps:如果部署tomcat的话,@ServerEndpoint不需要配置,tomcat默认支持

      本文标题:SpringBoot+WebSocket

      本文链接:https://www.haomeiwen.com/subject/bbcbiftx.html