Springboot之整合Socket連接案例

Socket連接與硬件通信

一、如何讓socket隨著springboot項目一起啟動

SpringBoot中CommandLineRunner的作用:平常開發中有可能需要實現在項目啟動後執行的功能,SpringBoot提供的一種簡單的實現方案就是添加一個model並實現CommandLineRunner接口,實現功能的代碼放在實現的run方法中

具體實現

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
/**
 * @author 易水●墨龍吟
 * @Description
 * @create 2019-04-14 23:40
 */
@Component
public class TestRunner implements CommandLineRunner {
  @Autowired
  private SocketProperties properties;
  @Override
  public void run(String... args) throws Exception {
    ServerSocket server = null;
    Socket socket = null;
    server = new ServerSocket(properties.getPort());
    System.out.println("設備服務器已經開啟, 監聽端口:" + properties.getPort());
    ThreadPoolExecutor pool = new ThreadPoolExecutor(
        properties.getPoolCore(),
        properties.getPoolMax(),
        properties.getPoolKeep(),
        TimeUnit.SECONDS,
        new ArrayBlockingQueue<Runnable>(properties.getPoolQueueInit()),
        new ThreadPoolExecutor.DiscardOldestPolicy()
    );
    while (true) {
      socket = server.accept();
      pool.execute(new ServerConfig(socket));
    }
  }
}

此處使用瞭自定義的線程池,提高對於socket的客戶端處理能力。

二、自定義配置並使用

此處將socket的端口和線程池的一些配置放到 application.yml中使用,方便使用和修改

# Socket配置
socket:
 # 監聽端口 2323
 port: 2323
 # 線程池 - 保持線程數 20
 pool-keep: 20
 # 線程池 - 核心線程數 10
 pool-core: 10
 # 線程池 - 最大線程數 20
 pool-max: 30
 # 線程隊列容量 10
 pool-queue-init: 10
import lombok.Getter;
import lombok.Setter;
import lombok.ToString;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;
/**
 * @author 易水●墨龍吟
 * @Description
 * @create 2019-04-18 22:35
 */
@Setter
@Getter
@ToString
@Component
@Configuration
@PropertySource("classpath:application.yml")
@ConfigurationProperties(prefix = "socket")
public class SocketProperties {
  private Integer port;
  private Integer poolKeep;
  private Integer poolCore;
  private Integer poolMax;
  private Integer poolQueueInit;
}

三、Socket對於客戶端發來的信息的處理和重發機制

當客戶端端連接之後發送信息,如果超時未發送,將會關閉,發送數據有異常將會返回給客戶端一個error,讓客戶端在發送一次數據。

import com.farm.config.socket.resolve.MessageChain;
import com.farm.service.EnvironmentService;
import com.farm.service.impl.EnvironmentServiceImpl;
import java.io.*;
import java.net.Socket;
import java.net.SocketException;
import java.net.SocketTimeoutException;
import java.util.Map;
/**
 * @author 易水●墨龍吟
 * @Description
 * @create 2019-04-14 23:21
 */
public class ServerConfig extends Thread {
  private Socket socket;
  public ServerConfig(Socket socket) {
    this.socket = socket;
  }
	// 獲取spring容器管理的類,可以獲取到sevrice的類
  private EnvironmentService service = SpringUtil.getBean(EnvironmentServiceImpl.class);
  private String handle(InputStream inputStream) throws IOException, DataFormException {
    byte[] bytes = new byte[1024];
    int len = inputStream.read(bytes);
    if (len != -1) {
      StringBuffer request = new StringBuffer();
      request.append(new String(bytes, 0, len, "UTF-8"));
      System.out.println("接受的數據: " + request);
      System.out.println("from client ... " + request + "當前線程" + Thread.currentThread().getName());
      Map<String, String> map = MessageChain.out(request.toString());
      System.out.println("處理的數據" + map);
      Integer res = service.addEnvironment(map);
      if (res == 1) {
        return "ok";
      } else {
        throw new DataFormException("數據處理異常");
      }
    } else {
      throw new DataFormException("數據處理異常");
    }
  }
  @Override
  public void run() {
    BufferedWriter writer = null;
    try {
      // 設置連接超時9秒
      socket.setSoTimeout(9000);
      System.out.println("客戶 - " + socket.getRemoteSocketAddress() + " -> 機連接成功");
      InputStream inputStream = socket.getInputStream();
      writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
      String result = null;
      try {
        result = handle(inputStream);
        writer.write(result);
        writer.newLine();
        writer.flush();
      } catch (IOException | DataFormException | IllegalArgumentException e) {
        writer.write("error");
        writer.newLine();
        writer.flush();
        System.out.println("發生異常");
        try {
          System.out.println("再次接受!");
          result = handle(inputStream);
          writer.write(result);
          writer.newLine();
          writer.flush();
        } catch (DataFormException | SocketTimeoutException ex) {
          System.out.println("再次接受, 發生異常,連接關閉");
        }
      }
    } catch (SocketException socketException) {
      socketException.printStackTrace();
      try {
        writer.close();
      } catch (IOException ioException) {
        ioException.printStackTrace();
      }
    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      try {
        writer.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }
}

在此處有一個坑,如果客戶端是用C/C++編寫的,必須使用如下方法:

byte[] bytes = new byte[1024];
int len = inputStream.read(bytes);

如果使用readLine或者 DataInputStream dataInputStream =new DataInputStream(socket.getInputStream())這樣會出現使用TCP連接助手,客戶端發送數據收不到。

四、如何在普通類中使用Spring註入類

這裡需要使用一個工具類。

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
/**
 * @author 易水●墨龍吟
 * @Description
 * @create 2019-04-15 0:01
 */
@Component
public class SpringUtil implements ApplicationContextAware {
  private static ApplicationContext applicationContext;
  @Override
  public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    if (SpringUtil.applicationContext == null) {
      SpringUtil.applicationContext = applicationContext;
    }
  }
  /**
   * 獲取applicationContext
   * @return
   */
  public static ApplicationContext getApplicationContext() {
    return applicationContext;
  }
  /**
   * 通過name獲取 Bean.
   * @param name
   * @return
   */
  public static Object getBean(String name){
    return getApplicationContext().getBean(name);
  }
  /**
   * 通過class獲取Bean.
   * @param clazz
   * @param <T>
   * @return
   */
  public static <T> T getBean(Class<T> clazz){
    return getApplicationContext().getBean(clazz);
  }
  /**
   * 通過name,以及Clazz返回指定的Bean
   * @param name
   * @param clazz
   * @param <T>
   * @return
   */
  public static <T> T getBean(String name,Class<T> clazz){
    return getApplicationContext().getBean(name, clazz);
  }
}

補充:springboot下websocket前臺後端數據長連接

首先導入依賴

 <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-websocket</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-messaging</artifactId>
    </dependency>

spring-security-messaging 是後面繼承 AbstractSecurityWebSocketMessageBrokerConfigurer需要用到的依賴

WebSocketConfig

@Configuration
@EnableWebSocketMessageBroker //此註解表示使用STOMP協議來傳輸基於消息代理的消息,此時可以在@Controller類中使用@MessageMapping 
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
  @Override
  public void registerStompEndpoints(StompEndpointRegistry registry) {
     /**
     * 註冊 Stomp的端點
     * addEndpoint:添加STOMP協議的端點。這個HTTP URL是供WebSocket或SockJS客戶端訪問的地址
     * withSockJS:指定端點使用SockJS協議
     */
    registry.addEndpoint("/websocket/tracker")   //物流消息通道,
      .setAllowedOrigins("*")   //允許跨域,裡面路徑可以設定
      .withSockJS()   //指定協議
      .setInterceptors(httpSessionHandshakeInterceptor()) ;    //設置攔截器()
  }
  @Override
  public void configureMessageBroker(MessageBrokerRegistry registry) {
     /**
     * 配置消息代理
     * 啟動簡單Broker,消息的發送的地址符合配置的前綴來的消息才發送到這個broker
     */
    registry.enableSimpleBroker("/topic","/user");
  }
 //攔截器
 @Bean
  public HandshakeInterceptor httpSessionHandshakeInterceptor() {
    return new HandshakeInterceptor() {
      @Override
      public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Map<String, Object> attributes) throws Exception {
        //可以在這裡先判斷登錄是否合法
        return true;
      }
      @Override
      public void afterHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Exception exception) {
  //握手成功後,
      }
    };
  }
}

WebsocketSecurityConfiguration

@Configuration
public class WebsocketSecurityConfiguration extends AbstractSecurityWebSocketMessageBrokerConfigurer {
  @Override
  protected void configureInbound(MessageSecurityMetadataSourceRegistry messages) {
    messages
      .nullDestMatcher().authenticated()
      .simpDestMatchers("/topic/**").authenticated()
      .simpDestMatchers("/user/**").authenticated()
      .simpTypeMatchers(SimpMessageType.MESSAGE, SimpMessageType.SUBSCRIBE).denyAll()
      // catch all
      .anyMessage().denyAll();
  }
  /**
   * Disables CSRF for Websockets.
   */
  @Override
  protected boolean sameOriginDisabled() {
    return true;
  }
}

WebSocketResource

package com.gleam.shopmall.web.rest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationListener;
import org.springframework.messaging.handler.annotation.MessageMapping;
import org.springframework.messaging.handler.annotation.SendTo;
import org.springframework.messaging.simp.SimpMessageHeaderAccessor;
import org.springframework.messaging.simp.SimpMessageMappingInfo;
import org.springframework.messaging.simp.SimpMessageSendingOperations;
import org.springframework.stereotype.Controller;
import org.springframework.web.socket.messaging.SessionDisconnectEvent;
@Controller
public class WebSocketResource {
  private static final Logger log = LoggerFactory.getLogger(WebSocketResource.class);
  @Autowired
  SimpMessageSendingOperations messagingTemplate;
 //此方法適用於網頁聊天室,從前端接收數據,返回訂閱者(前端)
  @MessageMapping("/welcome") //指定要接收消息的地址,類似@RequestMapping
  @SendTo("/topic/getResponse")  //默認消息將被發送到與傳入消息相同的目的地,但是目的地前面附加前綴(默認情況下為“/topic”}
  public String say(String message) throws Exception {
    return message;
  }
 //發送指定用戶(直接從後端發送數據到前端)
  public void sendToUser(String login,String channel, String info) {
    log.debug("[ToUser]WEBSOCKET發送消息, username={}, info={}", login, info);
    this.messagingTemplate.convertAndSendToUser(login, channel, info);
    log.debug("[ToUser]WEBSOCKET發送消息:完成");
  }
 //發送所有訂閱的(直接從後端發送數據到前端)
  public void send(String channel, String info) {
    log.debug("[ToAll]WEBSOCKET發送消息, info={}", info);
    // this.messagingTemplate.convertAndSend(channel, info);
    this.messagingTemplate.convertAndSend("/topic/getResponse", "接收到瞭嗎?");
    log.debug("[ToAll]WEBSOCKET發送消息:完成");
  }
}

前端html

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
  <meta charset="UTF-8" />
  <script src="http://cdn.jsdelivr.net/sockjs/0.3.4/sockjs.min.js"></script>
  <script src="https://cdn.bootcss.com/stomp.js/2.3.3/stomp.js"></script>
  <script src="http://code.jquery.com/jquery-1.7.2.min.js"></script>
  <script src="http://pv.sohu.com/cityjson?ie=utf-8"></script>
  <title>Spring Boot+WebSocket+廣播式</title>
  <script type="text/javascript">
    var stompClient = null;
    function setConnected(connected) {
      document.getElementById('connect').disabled = connected;
      document.getElementById('disconnect').disabled = !connected;
      document.getElementById('conversationDiv').style.visibility = connected ? 'visible' : 'hidden';
      $('#response').html();
    }
    function connect() {
     // websocket的連接地址,此值等於WebSocketConfig中registry.addEndpoint("/websocket/tracker").withSockJS()配置的地址,
     //這裡如果是微服務或者遠端,需要全路徑
      var socket = new SockJS('/websocket/tracker'); //1
      stompClient = Stomp.over(socket);//2
      stompClient.connect({}, function(frame) {//3
        setConnected(true);
        console.log('開始進行連接Connected: ' + frame);
        // 客戶端訂閱消息的目的地址:此值等於WebSocketResource中@SendTo("/topic/getResponse")註解的裡配置的值
        stompClient.subscribe('/topic/getResponse', function(respnose){ //4
          showResponse(respnose.body);
        });
      });
    }
    function disconnect() {
      if (stompClient != null) {
        stompClient.disconnect();
      }
      setConnected(false);
      console.log("Disconnected");
    }
    function sendName() {
      var name = $('#name').val();
      stompClient.send("/welcome", {}, returnCitySN['cip'] +":"+name);// JSON.stringify(name)
    }
    function showResponse(message) {
      var response = $("#response");
      response.html(message+"<br>" + response.html());
    }
  </script>
</head>
<body onload="disconnect()">
<noscript><h2 style="color: red">貌似你的瀏覽器不支持websocket</h2></noscript>
<div>
  <div>
    <button id="connect" onclick="connect();" style="color: red">連接</button>
    <button id="disconnect" disabled="disabled" onclick="disconnect();">斷開連接</button>
  </div>
  <div id="conversationDiv">
    <label>輸入內容</label><input type="text" id="name" />
    <button id="sendName" onclick="sendName();">發送</button>
    <p id="response"></p>
  </div>
</div>
</body>
</html>```

以上為個人經驗,希望能給大傢一個參考,也希望大傢多多支持WalkonNet。如有錯誤或未考慮完全的地方,望不吝賜教。