框架学习SpringHomejava

SpringBoot+WebSocket

2018-08-24  本文已影响8人  螃蟹和骆驼先生Yvan

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

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